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Prof. Dr.-Ing. Rolf Rascher

Professorinnen und Professoren im Ruhestand

Fakultät Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

Professor im Ruhestand

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Zeitschriftenartikel
  • Rolf Rascher

Schleifmaschinen auf der 6. EMO in Hannover.

In: maschine + werkzeug - Fertigungstechnik , pg. 48-54

(1985)

Beitrag in Sammelwerk/Tagungsband
  • Rolf Rascher

Technologie metallischer und keramischer Verbundwerkstoffe.

pg. 34-44

(1986)

Zeitschriftenartikel
  • Rolf Rascher

Integration im Verborgenen – Die 7. EMO in Mailand.

In: Moderne Fertigung , pg. 90-98

(1987)

Monographie
  • Rolf Rascher

Practical analysis of the process of producing balls for ball bearings.

Springer Verlag

(1988)

Zeitschriftenartikel
  • Rolf Rascher

IMTS ‘88 in Chicago.

In: maschine + werkzeug - Fertigungstechnik , pg. 88-97

(1988)

Monographie
  • Rolf Rascher

Experimentelle Untersuchungen zur Technologie der Kugelherstellung.

Berlin, Heidelberg: Springer Berlin Heidelberg

(1989)

Zeitschriftenartikel
  • Rolf Rascher

Entwicklungstendenzen beim Schleifen von Kugeln.

In: MM Industriemagazin-Maschinenmarkt (vol. 97) , pg. 34-38

(1991)

Zeitschriftenartikel
  • Rolf Rascher

Experimentelle Untersuchungen zur Technologie der Kugelherstellung.

In: wt (Werkstattstechnik) Produktion und Management (vol. 81) , pg. 663-664

(1991)

Beitrag in Sammelwerk/Tagungsband
  • Rolf Rascher
  • Peter Sperber

IFHEM – Innovatives Fertigungskonzept für High Tech-Flächen durch Einsatz von MRF-Technologie.

(2002)

Zeitschriftenartikel
  • Florian Schneider
  • Roland Maurer
  • A. Bickert
  • R. Stamp
  • G. Smith
  • Rolf Rascher

SG-Sensor – an affordable tactile alternative.

(2002)

Zeitschriftenartikel
  • Elmar Pitschke
  • Peter Sperber
  • R. Stamp
  • Rolf Rascher
  • L. Smith
  • M. Smith
  • Markus Schinhärl

Prediction of MRF polishing by classification of the initial error with Zernike polynomials.

In: Optical Manufacturing and Testing V (vol. 5180) , pg. 115-122

(2003)

DOI: 10.1117/12.507652

Abstract anzeigen

The magnetorheological finishing (MRF) process makes use of a magnetically stiffened magnetorheological abrasive fluid to polish the surface of a workpiece in a precise fashion. The process may be used to finish the surface of high quality optical lenses. Investigations have been undertaken to quantify the operation of MRF and to identify those parameters key to an optimal operation of this lens production process. A correlation has been developed to relate the parameters important to the removal characteristics and to the precision of the polishing result and to the duration of polishing. A relationship to indicate the most appropriate MRF processing parameters for a lens is presented. In the examples discussed Fringe-Zernike polynomials are used to quantify the error on a lens.
Vortrag
  • Elmar Pitschke
  • Peter Sperber
  • R. Stamp
  • Rolf Rascher
  • L. Smith
  • M. Smith
  • Markus Schinhärl

Prediction of MRF polishing by classification of the initial error with Zernike polynomials.

San Diego, CA, USA 03.08.2003.

(2003)

Vortrag
  • Elmar Pitschke
  • Peter Sperber
  • Rolf Rascher
  • R. Stamp
  • M. Smith
  • L. Smith
  • Markus Schinhärl

Lens production enhancement by adoption of artificial influence functions and a knowledge-based system in a magnetorheological finishing process.

San Diego, CA, USA 03.08.2003.

(2003)

Vortrag
  • Markus Schinhärl
  • Elmar Pitschke
  • Rolf Rascher
  • Peter Sperber
  • R. Stamp
  • L. Smith
  • G. Smith

Temporal stability and performance of MR polishing fluid.

  • SPIE, The International Society for Optics and Photonics.

San Diego, CA, USA 2004.

(2004)

Zeitschriftenartikel
  • Elmar Pitschke
  • Markus Schinhärl
  • Peter Sperber
  • Rolf Rascher
  • R. Stamp
  • L. Smith
  • M. Smith
  • A. Hammer

Comparison of a new contact topographical measurement system for spherical and aspherical surfaces with interferometry.

In: Current Developments in Lens Design and Optical Engineering V (vol. 5523) , pg. 225-234

(2004)

DOI: 10.1117/12.558899

Abstract anzeigen

Since end of 2003 the TII-3D - the new contact topography measuring device for measuring aspherical and spherical surfaces - is available on market. Due to its novel technology, the system is specified to measure a large range with λ/10 accuracy, therefore being a very flexible tool for pre- and post-measurements in high quality zonal polishing processes like MRF. At the University of Applied Sciences Deggendorf a testing series has been carries out to compare the results of the TII-3D with CGH-interferometric measurements on aspherical surfaces. An analysis of the measurement errors is shown and ranking of the different metrology systems for production processes of high quality aspherical lenses is given.
Zeitschriftenartikel
  • Markus Schinhärl
  • Elmar Pitschke
  • Rolf Rascher
  • Peter Sperber
  • R. Stamp
  • L. Smith
  • G. Smith

Temporal stability and performance of MR polishing fluid.

In: Current Developments in Lens Design and Optical Engineering V (vol. 5523) , pg. 273-280

(2004)

DOI: 10.1117/12.558897

Abstract anzeigen

The lifetime of standard magnetorheological (MR) polishing fluids, used for example in polishing machines for optical applications, is limited. Scanning electron microscope examinations as well as chemical analyses of the fluid had been undertaken in order to investigate reasons for limited lifetime. We found out that the removal rate decreases during the course of time. However, the usable fluid life is most limited by the point of time when the critical minimum amount of fluid, necessary to ensure circulation, is reached. The results in association with a new fluid conditioner show, that a standard MR polishing fluid may be used for longer periods than common periods of about 2 weeks.
Beitrag in Sammelwerk/Tagungsband
  • Elmar Pitschke
  • Markus Schinhärl
  • Rolf Rascher
  • Peter Sperber

Erzeugung hochpräziser Oberflächen auf optischen Bauelementen für die Präzisionsoptik mit magnetorheologischem Finishing (MRF).

pg. 89-98

(2004)

Vortrag
  • Elmar Pitschke
  • Markus Schinhärl
  • Rolf Rascher
  • Peter Sperber

Erzeugung hochpräziser Oberflächen auf optischen Bauelementen für die Präzisionsoptik mit magnetorheologischem Finishing (MRF).

Zwiesel 17.06.2004.

(2004)

Vortrag
  • Elmar Pitschke
  • Markus Schinhärl
  • Peter Sperber
  • Rolf Rascher
  • R. Stamp
  • L. Smith
  • M. Smith
  • A. Hammer

Comparison of a new contact topographical measurement system for spherical and aspherical surfaces with interferometry.

Denver, CO, USA 02.08.2004.

(2004)

Vortrag
  • Rolf Rascher

Labor Optical Engineering – Moderne Fertigungstechnik im Fokus.

Deggendorf 2005.

(2005)

Zeitschriftenartikel
  • Markus Schinhärl
  • Elmar Pitschke
  • Andreas Geiss
  • Rolf Rascher
  • Peter Sperber
  • R. Stamp
  • L. Smith
  • G. Smith

Comparison of different magnetorheological polishing fluids.

In: Optical Fabrication, Testing, and Metrology II (vol. 5965) , pg. 659-670

(2005)

DOI: 10.1117/12.656430

Abstract anzeigen

Magnetorheological Finishing (MRF) is commonly used to finish high quality optical surfaces. The process is based on a magnetorheological fluid, which stiffens in a magnetic field and thus may be used as a polishing tool. The fluid removal characteristic depends on several parameters, for example the magnetic field strength or the relative velocity between workpiece and polishing tool. Another parameter is the fluid itself. Different compositions of polishing abrasives result in different removal characteristics. At the University of Applied Sciences Deggendorf, five different magnetorheological polishing fluids have been analysed. The results of the research are scanning electron microscope analyses as well as spectra analyses. The removal characteristic for each fluid has been determined for different glass materials. Finally, the fluid conditions during polishing have been analysed. For this purpose, the fluid flow rate, the fluid pressure and the fluid viscosity have been investigated.
Zeitschriftenartikel
  • Elmar Pitschke
  • Markus Schinhärl
  • Peter Sperber
  • Rolf Rascher

Utilizing a TII aspherical measurement machine in a computer-controlled polishing process.

In: Optical Measurement Systems for Industrial Inspection IV (vol. 5856) , pg. 987-993

(2005)

DOI: 10.1117/12.612597

Abstract anzeigen

The demand on quality of optical surfaces is increasing from year to year. Computer controlled polishing is one way to fulfill these demands. The process depends on the error-profile of the optical surface. In this paper the usage of the TII measurement machine is discussed to manufacture optical surfaces.
Zeitschriftenartikel
  • Elmar Pitschke
  • Markus Schinhärl
  • Andreas Geiss
  • Peter Sperber
  • Rolf Rascher
  • R. Stamp
  • L. Smith
  • M. Smith

A new approach to predict computer-controlled polishing results.

In: Optical Manufacturing and Testing VI (vol. 5869) , pg. 94-102

(2005)

DOI: 10.1117/12.616780

Abstract anzeigen

A novel approach to handle and quantify a computer controlled polishing process will be introduced. This approach will be compared to real data. This comparison indicates the correctness of this approach. Based on it a formula has been developed to predict the results of a computer controlled polishing process. The formula will be used to predict real polishing processes and the results will be compared to the real results. The limits when using this formula will be shown along with suggestions when the formula would be useful. This rough prediction of the computer controlled polishing results may be used to enhance the automation of a computer controlled polishing process. Also a way to improve the formula itself will be introduced. It is the opinion of the author that by further stabilizing of the whole computer controlled polishing process the whole system becomes more robust, the prediction more accurate and the whole system improves in reliability and the results become better.
Zeitschriftenartikel
  • Markus Schinhärl
  • Elmar Pitschke
  • Andreas Geiss
  • Rolf Rascher
  • Peter Sperber
  • R. Stamp
  • L. Smith
  • G. Smith

New viscosity measurement for magnetorheological polishing fluid.

In: Optical Manufacturing and Testing VI (vol. 5869) , pg. 133-141

(2005)

DOI: 10.1117/12.616690

Abstract anzeigen

In Magnetorheological Finishing (MRF) a magnetic field is applied to a stream of abrasive magnetorheological fluid, in order that the fluid behaves as the polishing tool. The process may be used to finish the surface of high quality optical lenses. The fluid viscosity is one important parameter the polishing tool characteristic depends on. At the University of Applied Sciences Deggendorf a new viscosity measurement, which uses the inductance of the fluid had been tested. The result of the research is a close relationship between viscosity and inductance. The new viscosity measurement is not an absolute, but a comparative system, based on inductance of the flowing fluid and the fluid age.
Zeitschriftenartikel
  • Andreas Geiss
  • Markus Schinhärl
  • Elmar Pitschke
  • Rolf Rascher
  • Peter Sperber

Analysis of thermal sources in a magnetorheological finishing (MRF) process.

In: Optical Manufacturing and Testing VI (vol. 5869) , pg. 111-120

(2005)

DOI: 10.1117/12.616751

Abstract anzeigen

Magnetorheological finishing (MRF) is a computer controlled polishing (CCP) technique for high quality surfaces. The process uses a magnetorheological fluid which stiffens in a magnetic field and thus acts as the polishing tool. At the University of Applied Sciences Deggendorf thermal sources in a MRF polishing unit have been analysed using an infrared camera. The result of the research is a warming of the fluid in the fluid conditioner caused by the mixer motor. The existing cooling is therefore essential, in order to ensure a constant polishing tool characteristic during polishing runs. A new fluid conditioner, which was developed at the University of Applied Sciences Deggendorf, with the aim of an extended fluid lifetime may be used without cooling, because an increase of the fluid temperature in the conditioner could not been detected. Furthermore, a warming of the workpiece during the polishing process was not ascertainable.
Vortrag
  • Peter Sperber
  • Elmar Pitschke
  • Markus Schinhärl
  • Rolf Rascher

MRF in der Praxis – Optimierung der Wirtschaftlichkeit.

Deggendorf 19.04.2005.

(2005)

Vortrag
  • Elmar Pitschke
  • Markus Schinhärl
  • Peter Sperber
  • Rolf Rascher

Utilizing a TII aspherical measurement machine in a computer-controlled polishing process.

München 13.06.2005.

(2005)

Vortrag
  • Andreas Geiss
  • Markus Schinhärl
  • Elmar Pitschke
  • Rolf Rascher
  • Peter Sperber

Analysis of thermal sources in a magnetorheological finishing (MRF) process.

San Diego, CA, USA 31.07.2005.

(2005)

Vortrag
  • Markus Schinhärl
  • Elmar Pitschke
  • Andreas Geiss
  • Rolf Rascher
  • Peter Sperber
  • R. Stamp
  • L. Smith
  • G. Smith

New viscosity measurement for magnetorheological polishing fluid.

  • SPIE, The International Society for Optics and Photonics.

San Diego, CA, USA 31.07.2005.

(2005)

Vortrag
  • Elmar Pitschke
  • Markus Schinhärl
  • Andreas Geiss
  • Peter Sperber
  • Rolf Rascher
  • R. Stamp
  • L. Smith
  • M. Smith

A new approach to predict computer-controlled polishing results.

San Diego, CA, USA 31.07.2005.

(2005)

Vortrag
  • Markus Schinhärl
  • Elmar Pitschke
  • Andreas Geiss
  • Rolf Rascher
  • Peter Sperber
  • R. Stamp
  • L. Smith
  • G. Smith

Comparison of different magnetorheological polishing fluids.

Jena 12.09.2005.

(2005)

Zeitschriftenartikel
  • Elmar Pitschke
  • Markus Schinhärl
  • Peter Sperber
  • Rolf Rascher
  • R. Stamp
  • M. Smith
  • L. Smith

Correlation between influence- function quality and predictability of a computer-controlled polishing process.

In: Optical Engineering (vol. 45) , pg. 063401 ff.

(2006)

DOI: 10.1117/1.2213630

Abstract anzeigen

A mathematical method has been developed to analyze influence functions that are used in a computer-controlled polishing process. The influence function itself is usually generated by some kind of calibration where the exact procedure is dependent on the process used. The method is able to determine asymmetries in an influence function. Application of this method yields a value that may be used to judge the quality of an influence function. That quality is also an indicator of the variance of the evolving surface error profile, since a close relationship between it and the polishing process exists. On the basis of an ideal, theoretical process, a model to handle and quantify the result of a real polishing process is described. Practical application of this model demonstrates the effect of influence-function quality on the polishing result. Based on this model, the predictability of the polishing result is evaluated. This initiative to judge influence functions by their quality is an important contribution to the development of computer-controlled polishing. Due to improved process reliability, the reject rate will decrease, and the result will be more economic manufacture.
Zeitschriftenartikel
  • Markus Schinhärl
  • Andreas Geiss
  • Rolf Rascher
  • Peter Sperber
  • R. Stamp
  • L. Smith
  • G. Smith
  • Elmar Pitschke

Coherences between influence function size, polishing quality and process time in the magnetorheological finishing.

In: Current Developments in Lens Design and Optical Engineering VII (vol. 6288) , pg. 62880Q ff.

(2006)

DOI: 10.1117/12.678720

Abstract anzeigen

Magnetorheological finishing (MRF) is a computer controlled polishing process (CCP), which is commonly used in the field of high quality optical lens production. The process uses the material removal characteristic of the polishing tool (influence function) and the surface error-profile to calculate individual, surface error-profile dependent polishing sequences. At the University of Applied Sciences Deggendorf a testing series with a magnetorheological finishing machine has been performed, and effects of the influence function size and its removal capacity on the polishing quality and the process time have been investigated. The result of the research shows that the influence function size has a major effect on the process time, whereas the polishing quality is nearly independent of the influence function size. During the testing series the process time was significantly reduced using an appropriate influence function size. The process time decreased about 9% relating to the original influence function.
Beitrag in Sammelwerk/Tagungsband
  • Andreas Geiss
  • Markus Schinhärl
  • Elmar Pitschke
  • Rolf Rascher
  • Peter Sperber
  • J. Slabeycius

Deposits and damages on high precision surfaces of advanced materials.

(2006)

Zeitschriftenartikel
  • Andreas Geiss
  • Markus Schinhärl
  • Elmar Pitschke
  • Rolf Rascher
  • Peter Sperber
  • J. Slabeycius

Sedimentations on high-precision surfaces of advanced materials by magnetorheological finishing.

In: Current Developments in Lens Design and Optical Engineering VII (vol. 6288) , pg. 62880R ff.

(2006)

Abstract anzeigen

Magnetorheological finishing (MRF) is a computer controlled polishing (CCP) technique for high precision surfaces. The process uses a magnetorheological fluid which stiffens in a magnetic field and thus acts as the polishing tool. A standard MR fluid consists of magnetic carbonyl iron (CI) particles, nonmagnetic polishing abrasives and liquid. To delaying oxidation of the iron particles and avoiding agglomeration the liquid consists of water completed with stabilizers. For the material removal and smoothing of the surface mostly cerium oxide or diamond is used. The materials to be polished may tend toward to different sedimentations of the MR fluid on the machined surface. These sedimentations result from the machining and may develop a polishing layer with MR fluid components. At the University of Applied Sciences Deggendorf analysis of the machined surface are made by the scanning electronic microscope (SEM) to determine the sedimentations of the finishing. The results of the research display the influence for the surface properties due to developing polishing layer by magnetorheological finishing.
Beitrag in Sammelwerk/Tagungsband
  • Andreas Geiss
  • Markus Schinhärl
  • Elmar Pitschke
  • Rolf Rascher
  • Peter Sperber

Rauhigkeitsentwicklung bei der Bearbeitung von Komponenten für die Präzisionsoptik mit Diamantwerkzeugen.

(2006)

Vortrag
  • Rolf Rascher
  • Peter Sperber

Aktuelle Ergebnisse aus dem Labor Optical Engineering der FH Deggendorf zu den Arbeiten auf den Gebieten Ultraschallunterstütztes Schleifen und ELID-Schleifen.

Deggendorf 2006.

(2006)

Vortrag
  • Markus Schinhärl
  • Andreas Geiss
  • Rolf Rascher
  • Peter Sperber
  • R. Stamp
  • L. Smith
  • G. Smith
  • Elmar Pitschke

Coherences between influence function size, polishing quality and process time in the magnetorheological finishing.

San Diego, CA, USA 2006.

(2006)

Beitrag in Sammelwerk/Tagungsband
  • Andreas Geiss
  • Markus Schinhärl
  • Elmar Pitschke
  • Rolf Rascher
  • Peter Sperber

Rauhigkeitsentwicklung bei der Bearbeitung von Komponenten für die Präzisionsoptik mit Diamantwerkzeugen.

pg. 143-153

(2006)

Zeitschriftenartikel
  • Elmar Pitschke
  • Markus Schinhärl
  • Rolf Rascher
  • Peter Sperber
  • L. Smith
  • R. Stamp
  • M. Smith

Simulation of a complex optical polishing process using a neural network.

In: Robotics and Computer-Integrated Manufacturing (vol. 24) , pg. 32-37

(2006)

DOI: 10.1016/j.rcim.2006.07.003

Abstract anzeigen

Most modern manufacturing processes change their set of parameters during machining in order to work at the optimum state. But in some cases, like computer-controlled polishing, it is not possible to change these parameters during the machining. Then usually a standard set of parameters is chosen which is not adjusted to the specific conditions. To gather the optimum set of parameters anyway simulation of the process prior to manufacturing is a possibility. This research illustrates the successful implementation of a neural network to accomplish such a simulation. The characteristic of this neural network is described along with the decision of the used inputs and outputs. Results are shown and the further usage of the neural network within an automation framework is discussed. The ability to simulate these advanced manufacturing processes is an important contribution to extend automation further and thus increase cost effectiveness.
Vortrag
  • Andreas Geiss
  • Markus Schinhärl
  • Elmar Pitschke
  • Rolf Rascher
  • Peter Sperber
  • J. Slabeycius

Deposits and damages on high precision surfaces of advanced materials.

Puchov, Slowakei 10.-13.05.2006.

(2006)

Vortrag
  • Andreas Geiss
  • Markus Schinhärl
  • Elmar Pitschke
  • Rolf Rascher
  • Peter Sperber
  • J. Slabeycius

Sedimentations on high-precision surfaces of advanced materials by magnetorheological finishing.

San Diego, CA, USA 13.08.2006.

(2006)

Zeitschriftenartikel
  • Markus Schinhärl
  • G. Smith
  • Andreas Geiss
  • L. Smith
  • Rolf Rascher
  • Peter Sperber
  • Elmar Pitschke
  • R. Stamp

Calculation of MRF influence functions.

In: Optical Manufacturing and Testing VII (vol. 6671) , pg. 66710Y ff.

(2007)

Abstract anzeigen

Magnetorheological finishing (MRF) is a commonly used computer-controlled polishing (CCP) technique for high precision optical surfaces. The process is based on a magnetorheological abrasive fluid, which stiffens in a magnetic field and may be employed as a sub-aperture polishing tool. Dependent upon the surface error-profile of the workpiece and the polishing tool characteristic (influence function) an individual polishing procedure is calculated prior to processing. However, determination of the influence function remains a time consuming and laborious task. A user friendly and easy to use software tool has been developed, which enables rapid computation of MRF influence functions dependent on the MRF specific parameters, such as, magnetic field strength or fluid viscosity. The software supersedes the current cumbersome and time consuming determination procedure and thus results in considerably improved and more economical manufacture. In comparison with the conventional time period of typically 20 minutes to ascertain an influence function, it may now be calculated in a few seconds. An average quality improvement of 57% relating to the peak-valley (PV) value, and approximately 66% relating to the root-mean-square (RMS) of the surface error-profiles was observed during employment of the artificial computed influence functions for polishing.
Vortrag
  • Rolf Rascher

Ultraschallbearbeitung von Glas.

  • Österreichische Arbeitsgruppe für Zerspanungstechnik AFA e.V..

2007.

(2007)

Zeitschriftenartikel
  • Elmar Pitschke
  • Peter Sperber
  • Rolf Rascher
  • R. Stamp
  • M. Smith
  • L. Smith
  • Markus Schinhärl

Lens production enhancement by adoption of artificial influence functions and a knowledge-based system in a magnetorheological finishing process.

In: Optical Manufacturing and Testing VII (vol. 6671) , pg. 66711J ff.

(2007)

DOI: 10.1117/12.761356

Abstract anzeigen

High quality optical lenses are usually finished by magnetorheological finishing (MRF). In this process an abrasive fluid, with the ability to stiffen in a magnetic field, is used as the polishing tool in a computer-controlled machine tool. Although the machine is automated it is necessary for a skilled operator to set the machine and make judgments with regard to its operation. An investigation has been under way to examine the detailed operation of the MRF process, and the information that is necessary to establish best practice. This has resulted in the incorporation of a knowledge based system (KBS) into the machine control regime, and a methodology for the creation of artificial polishing tool characteristics, the machine influence function. The incorporation of the these elements has been instrumental in the operation of an enhanced MRF machine. This has been subject to extensive test procedures, and it has been demonstrated that the production process may be enhanced significantly and consistently. Batch production time may be significantly reduced, a figure in excess of a 50% reduction was met consistently during prolonged operation. Furthermore the incorporation of the KBS is instrumental in increasing the automation of the MRF process, reducing the levels of manual input necessary to manage machine operation.
Beitrag in Sammelwerk/Tagungsband
  • K. Fathima
  • Andreas Geiss
  • Rolf Rascher
  • Peter Sperber
  • Markus Schinhärl
  • Elmar Pitschke

Design and development of a novel computer-controlled power device for electrical-assisted optical grinding.

pg. TD0406-1 ff.

(2007)

Zeitschriftenartikel
  • Markus Schinhärl
  • Rolf Rascher
  • R. Stamp
  • G. Smith
  • L. Smith
  • Elmar Pitschke
  • Peter Sperber

Filter algorithm for influence functions in the computer-controlled polishing of high-quality optical lenses.

In: International Journal of Machine Tools and Manufacture (vol. 47) , pg. 107-111

(2007)

Abstract anzeigen

Computer controlled polishing (CCP) is widely used in the production of high-quality optical lenses. CCP enables surface error-profile-dependent calculation of polishing sequences prior to processing, and facilitates the cost-effective manufacture of high-quality optical surfaces. Calculation of an individual polishing sequence requires knowledge of the surface error-profile in addition to knowledge of the material removal characteristic (influence function) of the polishing tool. Measurement errors during both determination of the surface error-profile, and the influence function, may lead to an incorrect polishing sequence calculation, which in turn may result in an inadequate product quality. A new method has been developed which minimises the effects of measurement errors on the influence function. The resulting algorithm renders an influence function symmetrical and filters noisy data. Practical polishing tests with magnetorheological finishing have been performed to verify this new technique. The improvement of the peak-valley (PV) value of the surfaces polished with the symmetrical rendered influence function was observed to average 14% greater than that which related to the PV value improvement of those surfaces which were polished with the unmodified influence function. The algorithm developed is based on software and is easily implemented. Thus, artificial enhancement of an influence function is a straightforward technique to improve the result of the polishing process.
Beitrag in Sammelwerk/Tagungsband
  • Andreas Geiss
  • Markus Schinhärl
  • Elmar Pitschke
  • K. Fathima
  • Rolf Rascher
  • Peter Sperber
  • J. Slabeycius

Correcting silicon carbide and silicon nitride moulds by Magnetorheological Finishing.

pg. 360-363

(2007)

Vortrag
  • Markus Schinhärl
  • G. Smith
  • Andreas Geiss
  • L. Smith
  • Rolf Rascher
  • Peter Sperber
  • Elmar Pitschke
  • R. Stamp

Calculation of MRF influence functions.

San Diego, CA, USA 2007.

(2007)

Beitrag in Sammelwerk/Tagungsband
  • Andreas Geiss
  • Markus Schinhärl
  • Elmar Pitschke
  • Rolf Rascher
  • Peter Sperber
  • K. Fathima
  • J. Slabeycius

Subsurface damages detecting on standard optical glass by dimple method.

pg. 13 ff.

(2007)

Vortrag
  • Andreas Geiss
  • Markus Schinhärl
  • Elmar Pitschke
  • Rolf Rascher
  • Peter Sperber
  • K. Fathima
  • J. Slabeycius

Subsurface damages detecting on standard optical glass by dimple method.

Jasna, Slowakei 29.-31.08.2007.

(2007)

Zeitschriftenartikel
  • Markus Schinhärl
  • Rolf Rascher
  • R. Stamp
  • L. Smith
  • G. Smith
  • Peter Sperber
  • Elmar Pitschke

Utilisation of time-variant influence functions in the computer-controlled polishing.

In: Precision Engineering (vol. 32) , pg. 47-54

(2008)

DOI: 10.1016/j.precisioneng.2007.04.005

Abstract anzeigen

In the computer controlled polishing, a polishing tool moves in a well-defined manner across the workpiece surface in order to individually remove the surface error-profile. The commonly used technique to calculate the moving of the polishing tool is the dwell time method. Based on a constant (time-invariant) removal characteristic of the polishing tool (influence function) the amount of material to be removed is controlled via the dwell time. The longer the polishing tool is in contact with a particular area of the workpiece, the more material is removed at this position. Mathematical basics to calculate dwell time-profiles are shown, and a new approach considering time-variant influence functions for the computer controlled polishing is introduced. The results point out that time-variant influence functions may contribute to further decrease the process time, and thus to make a computer controlled polishing process more efficient. The reduction of the process time was observed to approximately 35% using a combination of the dwell time method with time-variant influence functions.
Zeitschriftenartikel
  • Markus Schinhärl
  • G. Smith
  • R. Stamp
  • Rolf Rascher
  • L. Smith
  • Elmar Pitschke
  • Peter Sperber
  • Andreas Geiss

Mathematical modelling of influence functions in computer-controlled polishing. Part I.

In: Applied Mathematical Modelling (vol. 32) , pg. 2888-2906

(2008)

Abstract anzeigen

Computer-controlled polishing (CCP) is commonly used to finish high-quality surfaces, such as optical lenses. Based on magnetorheological finishing (MRF), a mathematical model to calculate the polishing tool characteristic (influence function) was developed and verified experimentally. The first part of this paper introduces the model to predict the size and shape of an influence function. The second part of this paper describes the calculation of the distribution of material removal within the size of an influence function. The model supersedes the current cumbersome procedure for determining an influence function and thus results in considerably improved and more economical manufacture. Furthermore, the model enables the quality of the final surface to be enhanced when polishing complex, for example aspherical or free-form, workpiece geometries and provides the first step in the application of time-variant influence functions.
Beitrag in Sammelwerk/Tagungsband
  • Christian Schopf
  • K. Fathima
  • Andreas Geiss
  • Markus Schinhärl
  • Christian Vogt
  • Rolf Rascher
  • Peter Sperber

Ultraschallunterstütztes Schleifen von Linsen.

pg. 191-203

(2008)

Zeitschriftenartikel
  • Markus Schinhärl
  • G. Smith
  • R. Stamp
  • Rolf Rascher
  • L. Smith
  • Elmar Pitschke
  • Peter Sperber
  • Andreas Geiss

Mathematical modelling of influence functions in computer-controlled polishing. Part II.

In: Applied Mathematical Modelling (vol. 32) , pg. 2907-2924

(2008)

Abstract anzeigen

Computer-controlled polishing (CCP) is commonly used to finish high-quality surfaces, such as optical lenses. Based on magnetorheological finishing (MRF), a mathematical model to calculate the polishing tool characteristic (influence function) was developed and verified experimentally. The second part of this paper describes the calculation of the distribution of material removal within the size of an influence function and is based on Preston’s fundamental polishing equation. The complete influence function model was implemented using MATLAB. The result is a user-friendly and easy-to-use software tool that enables fast computation of MRF influence functions without the current cumbersome determination procedure, and thus gives improved and more economical production of high-quality surfaces.
Vortrag
  • Rolf Rascher
  • Peter Sperber

Blick in die Zukunft - Eine Agenda zur Optikfertigung 2015?.

Deggendorf 2008.

(2008)

Zeitschriftenartikel
  • Elmar Pitschke
  • Markus Schinhärl
  • Rolf Rascher
  • Peter Sperber
  • L. Smith
  • R. Stamp
  • M. Smith

Simulation of a complex optical polishing process using a neural network.

In: Robotics and Computer-Integrated Manufacturing (vol. 24) , pg. 32-37

(2008)

DOI: 10.1016/j.rcim.2006.07.003

Abstract anzeigen

Most modern manufacturing processes change their set of parameters during machining in order to work at the optimum state. But in some cases, like computer-controlled polishing, it is not possible to change these parameters during the machining. Then usually a standard set of parameters is chosen which is not adjusted to the specific conditions. To gather the optimum set of parameters anyway simulation of the process prior to manufacturing is a possibility. This research illustrates the successful implementation of a neural network to accomplish such a simulation. The characteristic of this neural network is described along with the decision of the used inputs and outputs. Results are shown and the further usage of the neural network within an automation framework is discussed. The ability to simulate these advanced manufacturing processes is an important contribution to extend automation further and thus increase cost effectiveness.
Beitrag in Sammelwerk/Tagungsband
  • Andreas Geiss
  • K. Fathima
  • J. Slabeycius
  • L. Hajduchova
  • Rolf Rascher
  • Peter Sperber
  • Markus Schinhärl

Examination of surface and subsurface damages on silicon wafers using dimple polishing.

(2008)

Zeitschriftenartikel
  • Andreas Geiss
  • Rolf Rascher
  • J. Slabeycius
  • Markus Schinhärl
  • Peter Sperber
  • K. Fathima

Material removal study at silicon nitride molds for the precision glass molding using MRF process.

In: Current Developments in Lens Design and Optical Engineering IX (vol. 7060) , pg. 706007 ff.

(2008)

DOI: 10.1117/12.794583

Abstract anzeigen

High-technology applications which are using high precision optic components in high and medium quantities have increased during recent years. One possibility to mass-produce e.g. such lenses is the precision glass molding (PGM) process. Especially for aspheric and free-form elements the PGM process has certain advantages. Premise is to manufacture accurate press molds, which have to feature smaller figure errors as the required lenses and may be made of materials, which are difficult to machine, like silicon nitride ceramics. These work pieces have to be machined in economical and steady process chains. However, due to the complex shapes and the corresponding accuracy an error dependent polishing is required. The Magnetorheological Finishing (MRF) as a high precision computer controlled polishing (CCP) technique is used and will further be presented in this work. To achieve the postulated demands a previous study of the material removal at selected machining parameters is needed. Changing machining parameters modify the removal, which is presented through values like the peak and volume removal rate. The value changes during the controlled variation of process parameters are described and discussed. Magnetorheological Finishing (MRF) provides one of the best methods to finish PGM molds that are relatively inaccurate to high precision in an economical, steady and efficient way. This work indicates the MRF removal selection and removal interference for the correction and finishing of precise silicon nitride molds for the precision glass molding.
Beitrag in Sammelwerk/Tagungsband
  • K. Fathima
  • Christian Schopf
  • Andreas Geiss
  • Markus Schinhärl
  • Christian Vogt
  • Rolf Rascher
  • Peter Sperber

Precision finishing of aspherical optical components using ELID grinding.

pg. 191-203

(2008)

Beitrag in Sammelwerk/Tagungsband
  • Andreas Geiss
  • J. Slabeycius
  • Rolf Rascher
  • Markus Schinhärl
  • Peter Sperber
  • K. Fathima

Material influence of silicon nitride at Magnetorheological Finishing (MRF).

(2008)

Vortrag
  • Rolf Rascher

Advanced technologies in precision optics manufacturing - a view to 2015?.

  • Meopta-Optika.

Prerov, Tschechische Republik 2008.

(2008)

Beitrag in Sammelwerk/Tagungsband
  • Markus Schinhärl
  • Christian Vogt
  • Andreas Geiss
  • R. Stamp
  • Peter Sperber
  • L. Smith
  • G. Smith
  • Rolf Rascher

Forces acting between polishing tool and workpiece surface in magnetorheological finishing.

  • In:
  • P. Mouroulis
  • W. Smith
  • R. Johnson

vol. 7060 pg. 706006 ff.

DOI: 10.1117/12.794196

(2008)

Zeitschriftenartikel
  • Markus Schinhärl
  • R. Stamp
  • Elmar Pitschke
  • Rolf Rascher
  • L. Smith
  • G. Smith
  • Andreas Geiss
  • Peter Sperber

Advanced techniques for computer-controlled polishing.

In: Current Developments in Lens Design and Optical Engineering IX (vol. 7060)

(2008)

DOI: 10.1117/12.808036

Abstract anzeigen

Computer-controlled polishing has introduced determinism into the finishing of high-quality surfaces, for example those used as optical interfaces. Computer-controlled polishing may overcome many of the disadvantages of traditional polishing techniques. The polishing procedure is computed in terms of the surface error-profile and the material removal characteristic of the polishing tool, the influence function. Determinism and predictability not only enable more economical manufacture but also facilitate considerably increased processing accuracy. However, there are several disadvantages that serve to limit the capabilities of computer-controlled polishing, many of these are considered to be issues associated with determination of the influence function. Magnetorheological finishing has been investigated and various new techniques and approaches that dramatically enhance the potential as well as the economics of computer-controlled polishing have been developed and verified experimentally. Recent developments and advancements in computer-controlled polishing are discussed. The generic results of this research may be used in a wide variety of alternative applications in which controlled material removal is employed to achieve a desired surface specification, ranging from surface treatment processes in technical disciplines, to manipulation of biological surface textures in medical technologies.
Beitrag in Sammelwerk/Tagungsband
  • Andreas Geiss
  • Markus Schinhärl
  • Rolf Rascher
  • Peter Sperber
  • J. Slabeycius
  • K. Fathima
  • Christian Vogt

Magnetorheological Finishing of silicon nitride moulds.

(2008)

Vortrag
  • K. Fathima
  • Christian Schopf
  • Andreas Geiss
  • Markus Schinhärl
  • Christian Vogt
  • Rolf Rascher
  • Peter Sperber

Precision finishing of aspherical optical components using ELID grinding.

  • OTTI e.V., Zwiesel.

Zwiesel 04.-05.06.2008.

(2008)

Vortrag
  • Christian Schopf
  • K. Fathima
  • Andreas Geiss
  • Markus Schinhärl
  • Christian Vogt
  • Rolf Rascher
  • Peter Sperber

Ultraschallunterstütztes Schleifen von Linsen.

  • OTTI e.V., Zwiesel.

Zwiesel 04.-05.06.2008.

(2008)

Beitrag in Sammelwerk/Tagungsband
  • Christian Schopf
  • Rolf Rascher

Ultrasonic assisted drilling of brittle hard materials.

pg. 455-458

(2009)

Zeitschriftenartikel
  • H. Sporer
  • Rolf Rascher

Second Design ‐ Der große Wurf.

In: AUTOMOBIL PRODUKTION , pg. 24

(2009)

Vortrag
  • Rolf Rascher
  • et al.

2^nd Design ‐ Kosten senken in der 2. Runde.

  • 3M.

Neuss 2009.

(2009)

Vortrag
  • Rolf Rascher
  • Christian Vogt

Strategies for grinding optical free forms using ball shaped grinding wheels.

  • SPIE, The International Society for Optics and Photonics.

Rochester, NY, USA 11.-14.05.2009.

(2009)

Vortrag
  • Christian Vogt
  • R. Stamp
  • G. Smith
  • Rolf Rascher
  • Peter Sperber
  • Florian Schneider
  • Roland Maurer
  • Markus Schinhärl

Strategies for grinding optical free-forms using ball-shaped grinding wheels.

  • SPIE - The International Society for Optical Engineering.

Rochester, NY, USA 11.05.2009.

(2009)

Vortrag
  • Rolf Rascher
  • et al.

Vortrag ELSA Grind ‐ ELID supported grinding of thin micro-structured sapphire wafers.

  • Fraunhofer IPT.

Aachen 17.-18.11.2009.

(2009)

Beitrag in Sammelwerk/Tagungsband
  • Markus Schinhärl
  • Florian Schneider
  • Rolf Rascher
  • Christian Vogt
  • Peter Sperber

Relationship between influence function accuracy and polishing quality in magnetorheological finishing.

  • In:
  • L. Zhang
  • S. To
  • J. Sasian
  • L. Xiang

pg. 76550Y ff.

DOI: 10.1117/12.865508

(2010)

Beitrag in Sammelwerk/Tagungsband
  • Florian Schneider
  • Markus Schinhärl
  • Christian Vogt
  • Roland Maurer
  • Peter Sperber
  • Rolf Rascher
  • R. Stamp
  • G. Smith

Effects of mechanical inaccuracies on the measurement result in metrology systems.

vol. 7656 pg. 765611 ff.

(2010)

Beitrag in Sammelwerk/Tagungsband
  • Markus Schinhärl
  • Christian Vogt
  • Florian Schneider
  • Peter Sperber
  • Rolf Rascher

Investigations on Magnetorheological Finishing of High-Quality Optical Surfaces with Varying Influence Function (Proceedings of Optical Fabrication and Testing 2010; Jackson Hole, WY, USA; June 13-17, 2010).

Washington, DC, USA pg. OWD3 ff.

DOI: 10.1364/OFT.2010.OWD3

(2010)

Beitrag in Sammelwerk/Tagungsband
  • Christian Vogt
  • Markus Schinhärl
  • Florian Schneider
  • Peter Sperber
  • Rolf Rascher

Investigations on Grinding Tools for Silicon Carbide Based Advanced Materials.

  • In:
  • J. Bentley
  • R. Youngworth
  • G. Anurag

Bellingham: SPIE pg. OWD2 ff.

(2010)

Vortrag
  • Florian Schneider
  • Christian Vogt
  • Roland Maurer
  • Rolf Rascher
  • Peter Sperber

Effects of mechanical inaccuracies on the measurement result in metrology systems.

Dalian, China 2010.

(2010)

Beitrag in Sammelwerk/Tagungsband
  • Christian Schopf
  • Rolf Rascher
  • Peter Sperber

Vor- und Nachteile der Ultraschalltechnologie beim Schleifen von optischen Flächen.

OTTI pg. 59-72

(2010)

Beitrag in Sammelwerk/Tagungsband
  • Igor Makarenko
  • Christian Vogt
  • Rolf Rascher
  • Peter Sperber
  • Thomas Stirner

ELID supported grinding of thin sapphire wafers.

pg. 76550S ff.

(2010)

Vortrag
  • Christian Schopf
  • Peter Sperber
  • Rolf Rascher

Forschung für die Industrie im Technologiecampus Teisnach, Hochschule für Angewandte Wissenschaften – FH Deggendorf.

  • OTTI e.V., Zwiesel.

Zwiesel 2010.

(2010)

Vortrag
  • Christian Schopf
  • Rolf Rascher
  • Peter Sperber

Vor- und Nachteile der Ultraschalltechnologie beim Schleifen von optischen Flächen.

  • OTTI e.V., Zwiesel.

Zwiesel 2010.

(2010)

Vortrag
  • Rolf Rascher

Erfahrungen zum ELID-Schleifen hochfester, spröder Werkstoffe.

  • Hochschule Furtwangen.

Furtwangen 11.03.2010.

(2010)

Vortrag
  • Christian Schopf
  • Rolf Rascher

Ultraschalluntersütztes Bearbeiten optischer Materialien.

  • Technologie Campus Teisnach.

Teisnach 20.-21.04.2010.

(2010)

Vortrag
  • Markus Schinhärl
  • Rolf Rascher

Relationship between influence function accuracy and polishing quality in magnetorheological finishing.

Dalian, China 26.-29.04.2010.

(2010)

Vortrag
  • Igor Makarenko
  • Rolf Rascher

ELID supported grinding of thin Sapphire wafers.

Dalian, China 26.-29.04.2010.

(2010)

Vortrag
  • Florian Schneider
  • Rolf Rascher

Effects of mechanical inaccuracies on the Measurement result in metrology systems.

Dalian, China 26.-29.04.2010.

(2010)

Zeitschriftenartikel
  • Christian Vogt
  • S. Sinzinger
  • H. Adelsberger
  • Roland Maurer
  • Florian Schneider
  • R. Mandler
  • L. Kuepper
  • Rolf Rascher
  • Peter Sperber

An Experimental Study on a Flexible Grinding Tool.

In: Advanced Materials Research (vol. 325) , pg. 91-96

(2011)

DOI: 10.4028/www.scientific.net/AMR.325.91

Beitrag in Sammelwerk/Tagungsband
  • Roland Maurer
  • Florian Schneider
  • Christian Vogt
  • Markus Schinhärl
  • Peter Sperber
  • Rolf Rascher

Physical marker based stitching process of circular and non-circular interferograms.

  • In:
  • B. Bodermann

DOI: 10.1117/12.889491

(2011)

Zeitschriftenartikel
  • Rolf Rascher
  • Igor Makarenko

Use of ELID-grinding on brittle-hard materials.

In: International Journal of Mechatronics and Manufacturing Systems (vol. 4) , pg. 553-568

(2011)

DOI: 10.1504/IJMMS.2011.044105

Abstract anzeigen

Abstract: Electrolytic in-process dressing (ELID) is a grinding technology which enables to manufacture surfaces in a quality that is close to polished on advanced, brittle-hard materials such as used in optics. ELID grinding requires exactly aligned machining pa rameters of the grinding process. Sapphire is, due to its crystal structure, difficult to m achine. There is a request for thin, i.e., below 0.2 mm thickness, sub-surface dama ge free wafers. To grind sapphire, the material’s behaviour is to be c onsidered. Studies on the necessary oxide layer on the ELID grinding wheel and influe nces on its build-up process will be presented. In-feed and grinding velocity are varied and the results on wear, removal rate and surface quality are shown. The influence of the coolant and the stiffness of the machine, the grinding forces and pressure are evaluated. The ELID grinding is compared to conventio nal grinding. The achieved excellent surface roughness on sapphire is discussed
Vortrag
  • Heiko Biskup
  • Rolf Rascher
  • Christine Wünsche

Poliermittelerprobung I.

  • Technische Hochschule Deggendorf/Technologie Campus Teisnach.

Teisnach 13.07.2011.

(2011)

Beitrag in Sammelwerk/Tagungsband
  • M. Fuchs
  • Rolf Rascher
  • Alois Kasberger
  • Christian Wistl

Precision Glass Molding of lenses by using the nanotech molding process - a practical summary.

  • Joint Poster Session (JTu5A).

    • (2012)

    Vortrag
    • Heiko Biskup
    • Rolf Rascher
    • Christine Wünsche

    Poliermittelerprobung II.

    Mainz 23.02.2012.

    (2012)

    Vortrag
    • Heiko Biskup
    • Rolf Rascher
    • Christine Wünsche

    Laserdiffraktometrie zur Charakterisierung von Korngrößen und deren Verteilung in Poliermitteln.

    • Technische Hochschule Deggendorf/Technologie Campus Teisnach.

    Teisnach 30.07.2012.

    (2012)

    Vortrag
    • Heiko Biskup
    • Rolf Rascher
    • Christine Wünsche

    Laserdiffraktometrie - Korngrößenverteilung in Poliermitteln. Posterbeitrag.

    • Technische Hochschule Deggendorf/Technologie Campus Teisnach.

    Teisnach 30.07.2012.

    (2012)

    Vortrag
    • Paul Schötz
    • Johannes Liebl
    • Rolf Rascher
    • Christine Wünsche
    • Engelbert Hofbauer
    • Karlheinz Penzkofer

    Metrology at Technologie Campus Teisnach.

    • Physikalisch-Technische Bundesanstalt (PTB)/Kompetenzzentrum Ultrapräzise Oberflächenbearbeitung e.V..

    Braunschweig 12.-13.11.2012.

    (2012)

    Vortrag
    • Rolf Rascher
    • Johannes Liebl
    • et al.

    Hochgenaue Optische Abstandssensoren in Messtechnik und Qualitätssicherung.

    Darmstadt 15.11.2012.

    (2012)

    Vortrag
    • Johannes Liebl
    • Rolf Rascher
    • Katharina Dieser

    GF-Projekt Optasens - Combination and evaluation of different optical and tactile sensor and measuring methods for analysis and global form-measurement on optical surfaces. Posterpräsentation.

    Berlin 29.11.2012.

    (2012)

    Beitrag in Sammelwerk/Tagungsband
    • Engelbert Hofbauer
    • Rolf Rascher
    • Thomas Stubenrauch
    • Johannes Liebl
    • Roland Maurer
    • et al.

    Approach to the measurement of astronomical mirrors with new procedures.

    • In:
    • R. Markovits-Somogyi
    • A. Adrienn
    • Z. Bokor

    (2013)

    Beitrag in Sammelwerk/Tagungsband
    • Roland Maurer
    • Florian Schneider
    • Christine Wünsche
    • Rolf Rascher

    Calculation of the reference surface error by analyzing a multiple set of sub-measurements.

    DOI: 10.1117/12.2024003

    (2013)

    Beitrag in Sammelwerk/Tagungsband
    • Christian Vogt
    • Florian Schneider
    • Rolf Rascher

    Grinding Processes for Silicon Carbide (CSiC) Materials.

    Berlin: Sieca Repro vol. 2 pg. 285-288

    (2013)

    Zeitschriftenartikel
    • Christian Schopf
    • Rolf Rascher
    • Christine Wünsche

    Rauhigkeitsmessungen an großen und schwer zugänglichen Bauteilen.

    In: MM Industriemagazin-Maschinenmarkt , pg. 40-41

    (2013)

    Vortrag
    • Rolf Rascher

    Moderne Optikfertigung.

    • Technische Hochschule Deggendorf/Technologie Campus Teisnach.

    Teisnach 12.03.2013.

    (2013)

    Vortrag
    • M. Willert-Porada
    • Thorsten Gerdes
    • A. Rosin
    • A. Saberi
    • A. Füller
    • Rolf Rascher
    • Christine Wünsche

    Flexiplant: schmelzebasierte kontinuierliche Herstellung von low TG-Glas-Preformen (mittels Minimeltertechnologie).

    • HVG-DGG: Service und Forschung für die Glasherstellung.

    Bremen 27.-29.05.2013.

    (2013)

    Vortrag
    • Rolf Rascher

    Fertigung präziser Optikflächen – schleifen und polieren oder pressen?.

    Wertheim-Bronnbach 26.09.2013.

    (2013)

    Beitrag in Sammelwerk/Tagungsband
    • Roland Maurer
    • Heiko Biskup
    • Christian J. Trum
    • Rolf Rascher
    • Christine Wünsche

    Determination of a suitable parameter field for the active fluid jet polishing process.

    • In:
    • M. Pfaff
    • J. Bentley

    DOI: 10.1117/12.2028752

    (2013)

    Vortrag
    • S. Draxinger
    • Christine Wünsche
    • Rolf Rascher

    Subaperture-polishing with variable spots.

    • The Optical Society of America (OSA).

    Tucson, AZ, USA 03.-06.11.2013.

    (2013)

    Zeitschriftenartikel
    • Johannes Liebl
    • Heiko Biskup
    • S. Draxinger
    • Rolf Rascher
    • Christine Wünsche

    Process developement fort the reproducible roughness measurement of optical surfaces using white light interferometry.

    In: International Journal of Metrology and Quality Engineering (EDP Sciences) (vol. 5) , pg. 29-35

    (2014)

    Beitrag in Sammelwerk/Tagungsband
    • Christian Vogt
    • S. Sinzinger
    • Rolf Rascher

    A Study on Elastic Grinding Tools.

    Washington, DC: OSA, The Optical Society pg. OTu3B.3

    DOI: 10.1364/OFT.2014.OTu3B.3

    (2014)

    Beitrag in Sammelwerk/Tagungsband
    • Engelbert Hofbauer
    • Rolf Rascher
    • K. Wühr
    • Felix Friedke
    • Thomas Stubenrauch
    • B. Pastötter
    • S. Schleich
    • C. Zöcke

    3D-optical measurement system using vignetting aperture procedure.

    • In:
    • W. Osten
    • C. Gorecki
    • A. Asundi

    pg. 913206

    DOI: 10.1117/12.2052631

    (2014)

    Beitrag in Sammelwerk/Tagungsband
    • O. Fähnle
    • E. Langenbach
    • F. Frost
    • A. Schindler
    • Heiko Biskup
    • Johannes Liebl
    • Christine Wünsche
    • Rolf Rascher

    Generation and field testing of roughness reference samples for industrial testing of surface roughness levels below 0.5nm Sq.

    pg. 216-218

    (2014)

    Vortrag
    • Thorsten Gerdes
    • K. Kyrgyzbayev
    • A. Rosin
    • A. Saberi
    • A. Füller
    • Rolf Rascher
    • Christine Wünsche

    Aims for the development of new optical glass materials.

    • Technische Hochschule Deggendorf/Technologie Campus Teisnach.

    Teisnach 01.-02.04.2014.

    (2014)

    Vortrag
    • Rolf Rascher

    Technologies and results for the mirror production in Teisnach.

    • Technische Hochschule Deggendorf.

    Teisnach 01.04.2014.

    (2014)

    Vortrag
    • Christian Vogt
    • S. Sinzinger
    • Rolf Rascher

    A study on elastic grinding tools.

    • The Optical Society of America (OSA).

    Kohala Coast, HI, USA Juni 2014.

    (2014)

    Vortrag
    • Rolf Rascher
    • Johannes Liebl
    • Paul Schötz
    • P. Frieder

    Automatische Kratzererkennung an hochpräzisen Drehteilen. „Projekt KonoScan“.

    Nürnberg 04.06.2014.

    (2014)

    Vortrag
    • S. Draxinger
    • Christian J. Trum
    • Heiko Biskup
    • Christine Wünsche
    • Rolf Rascher

    Active Fluid Jet Polishing - Behaviour on Different Materials.

    • The Optical Society of America (OSA).

    Kohala Coast, HI, USA 22.-26.06.2014.

    (2014)

    Vortrag
    • Patrick Schäfer
    • Christine Wünsche
    • Rolf Rascher

    Quantification of synthetic lens surface characteristics by an optical measurement system as stylus instrument.

    Liberec, Tschechische Republik 07.-10.10.2014.

    (2014)

    Zeitschriftenartikel
    • Heiko Biskup
    • Christian J. Trum
    • Rolf Rascher

    Stabilität im Polierprozess.

    In: Newsletter Bayern Photonics (Innovationsnetzwerk Optische Technologien)

    (2015)

    Beitrag in Sammelwerk/Tagungsband
    • Engelbert Hofbauer
    • Rolf Rascher
    • Felix Friedke
    • Thomas Stubenrauch
    • Johannes Liebl
    • J.-P. Richters

    The vignetting field stop procedure: A new physical measurement principle for the Deflectometric acquisition of big Optical Surfaces - DaOS.

    (2015)

    Beitrag in Sammelwerk/Tagungsband
    • Patrick Schäfer
    • Christine Wünsche
    • Rolf Rascher

    Quantification of synthetic lens surface characteristics by an optical measurement system as stylus instrument.

    pg. 944219

    (2015)

    Beitrag in Sammelwerk/Tagungsband
    • Christian Vogt
    • Martin Rohrbacher
    • Rolf Rascher
    • S. Sinzinger

    Dependency between removal characteristics and defined measurement categories of pellets.

    • In:
    • A. Hatheway

    pg. 95730N

    DOI: 10.1117/12.2189987

    (2015)

    Beitrag in Sammelwerk/Tagungsband
    • Heiko Biskup
    • Alexander Haberl
    • Rolf Rascher

    Surface errors in the course of machining precision optics.

    pg. 95750O

    DOI: 10.1117/12.2189991

    (2015)

    Vortrag
    • Heiko Biskup
    • Christian Schopf
    • Rolf Rascher

    Surface roughness testing below 0.5 nm Sq. Measuring of Sub-Nanometer Surface Texture by White-Light Interferometry.

    • NTB - Interstaatliche Hochschule für Technik.

    Buchs, Schweiz 03.09.2015.

    (2015)

    Beitrag in Sammelwerk/Tagungsband
    • Robert Schneider
    • Christian J. Trum

    Hexapod as primary kinematic system for applications in the optic industry.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Christine Wünsche
    • Christian Schopf

    DOI: 10.1117/12.2235400

    (2016)

    Beitrag in Sammelwerk/Tagungsband
    • Manon Schilke
    • Johannes Liebl
    • Christine Wünsche

    Surface reconstruction by using Zernike polynomials.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Christine Wünsche
    • Christian Schopf

    DOI: 10.1117/12.2236305

    (2016)

    Beitrag in Sammelwerk/Tagungsband
    • Christian Vogt
    • S. Sinzinger
    • Martin Rohrbacher
    • Rolf Rascher

    Prediction of grinding tool wear and lifetime by using a test bench.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Christine Wünsche
    • Christian Schopf

    (2016)

    Beitrag in Sammelwerk/Tagungsband
    • Engelbert Hofbauer
    • Rolf Rascher
    • Manon Schilke
    • Johannes Liebl
    • J.-P. Richters

    Deflectometric acquisition of large optical surfaces (DaOS) using a new physical measurement principle: vignetting field stop procedure.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Christine Wünsche
    • Christian Schopf

    DOI: 10.1117/12.2236134

    (2016)

    Beitrag in Sammelwerk/Tagungsband
    • Christian Schopf
    • Rolf Rascher

    Reducing forces during drilling brittle hard materials by using ultrasonic and variation of coolant.

    pg. 1015107

    DOI: 10.1117/12.2257106

    (2016)

    Zeitschriftenartikel
    • Engelbert Hofbauer
    • Rolf Rascher
    • Manon Schilke
    • Johannes Liebl
    • J.-P. Richters

    Deflectometric Acquisition of Large Optical Surfaces “DaOS” Using a New Physical Measurement Principle: Vignetting Field Stop. (Reprinted from Proceedings of SPIE Volume 10009: Third European Seminar on Precision Optics Manufacturing, 100090Y [Teisnach, April 12th 2016] doi:10.1117/12.2236134).

    In: Bavarian Journal of Applied Sciences , pg. 146-161

    (2016)

    Abstract anzeigen

    The vignetting field stop procedure uses a deflectometric approach to acquire big Optical Surfaces – DaOS – and it offers the possibility to measure nearly any shape or form using a scanning routine. The basic physical measurement principle in DaOS is the vignettation of a quasi-parallel light beam emitted by an expanded light source in auto collimation arrangement with a reflecting element. Thereby nearly any curvature of the specimen, is measurable. Due to the fact, that even sign changes in the curvature can be detected, also aspheres and freeform surfaces of any size can be evaluated. In this publication the vignetting field stop procedure is discussed. Additionally the deflectometric setup is described. Because of some typical influences of beam deflection to the accuracy of angle measurement by using the vignetting principle, suitable methods of calibration for the sensor are examined and the results of these methods are presented. Furthermore, the technical principle of deflectometric measurements using an angle detecting device is explained inclusive of all random and systematic errors generated by the setup. The last part of this publication shows the actual result of test measurements with calculated absolute deviation of errors with a large lateral dimension as well as the determination of the maximal achievable lateral resolution by detecting mid frequent structures on flat and spherical test parts with a diameter of 300 mm. These measurements are compared critically to reference results which are recorded by interferometry and further scanning methods.
    Beitrag in Sammelwerk/Tagungsband
    • Sebastian Sitzberger
    • Rolf Rascher

    An investigation on the efficiency of the manufacturing of components in precision optics.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Christine Wünsche
    • Christian Schopf

    DOI: 10.1117/12.2236137

    (2016)

    Zeitschriftenartikel
    • Engelbert Hofbauer
    • Rolf Rascher

    Deflectometric Acquisition of Large Optical Surfaces DaOS. Using a new physical measurement principle: vignetting field stop procedure.

    In: Optik&Photonik (vol. 11) , pg. 40-44

    (2016)

    DOI: 10.1002/opph.201600036

    Beitrag in Sammelwerk/Tagungsband
    • Johannes Liebl
    • Horst Linthe
    • Sebastian Sitzberger
    • Rolf Rascher

    Interferometric measurement of highly accurate flat surfaces.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Christine Wünsche
    • Christian Schopf

    DOI: 10.1117/12.2235525

    (2016)

    Beitrag in Sammelwerk/Tagungsband
    • Gerald Fütterer

    From Holographic displays to Volume Gratings and Off-Axis Parabolic Mirrors.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Christine Wünsche
    • Christian Schopf

    pg. 1000912

    DOI: 10.1117/12.2245183

    (2016)

    Beitrag in Sammelwerk/Tagungsband
    • Christian J. Trum
    • Rolf Rascher

    Improving efficiency of chemo-mechanical polishing processes by systematic selection and conditioning of the polishing suspension.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Christine Wünsche
    • Christian Schopf

    DOI: 10.1117/12.2236000

    (2016)

    Vortrag
    • Rolf Rascher
    • Christine Wünsche
    • Christian Schopf

    Aspects in laser polishing of precision optical components.

    Aachen 26.-27.04.2016.

    (2016)

    Vortrag
    • Rolf Rascher

    Innovationsentwicklung mit der Technischen Hochschule Deggendorf.

    Frankfurt am Main 07.06.2016.

    (2016)

    Vortrag
    • Christian Schopf
    • Rolf Rascher

    Reducing forces during drilling brittle hard materials by using ultrasonic and variation of coolant.

    • SPIE, The International Society for Optics and Photonics.

    Liberec, Tschechische Republik 11.10.2016.

    (2016)

    Vortrag
    • Rolf Rascher
    • C. Weingarten

    Hybridfertigung optischer Oberflächen.

    • Forschungsvereinigung Feinmechanik, Optik und Medizintechnik e.V..

    Berlin 02.11.2016.

    (2016)

    Beitrag in Sammelwerk/Tagungsband
    • Rolf Rascher
    • Christian Vogt
    • C. Faehnle

    In situ laser polishing optimization method: Control of LASer Surface Optimisation (C-Lasso).

    (2017)

    Beitrag in Sammelwerk/Tagungsband
    • Christian Schopf
    • Rolf Rascher
    • Johannes Liebl

    Cheap and fast measuring roughness on big surfaces with an imprint method.

    • In:
    • S. Stoebenau
    • J. Bentley

    pg. 1044822

    (2017)

    Zeitschriftenartikel
    • Christian Vogt
    • C. Faehnle
    • Rolf Rascher

    Grinding Process Validation Approach (gPVA).

    In: Journal of Physical Science and Application (vol. 7)

    (2017)

    DOI: 10.17265/2159-5348/2017.05.004

    Beitrag in Sammelwerk/Tagungsband
    • Christian Vogt
    • O. Fähnle
    • Rolf Rascher

    Three wagons Approach Applied to Optimization of Industrial Grinding Processes.

    • In:
    • OF&T
    • Fabrication
    • Optical Society of America
    • Optical Fabrication
    • OFT
    • Optical Design
    • OSA Optical Design
    • Testing
    • Fabrication Congress

    Washington, D.C., USA: OSA - The Optical Society pg. OTu2B.2

    DOI: 10.1364/OFT.2017.OTu2B.2

    (2017)

    Beitrag in Sammelwerk/Tagungsband
    • Alexander Haberl
    • Rolf Rascher

    Yet one more dwell time algorithm.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Christine Wünsche
    • Christian Schopf

    pg. 1032606

    DOI: 10.1117/12.2270540

    (2017)

    Beitrag in Sammelwerk/Tagungsband
    • P. Rinck
    • Sebastian Sitzberger
    • M. Zaeh

    Actuator design for vibration assisted machining of high performance materials with ultrasonically modulated cutting speed.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Christine Wünsche
    • Christian Schopf

    pg. 103260C

    DOI: 10.1117/12.2272133

    (2017)

    Beitrag in Sammelwerk/Tagungsband
    • Josef Stettmer

    Process optimization at small and medium-sized enterprises: production of small and medium-sized batches.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Christine Wünsche
    • Christian Schopf

    pg. 103260P

    DOI: 10.1117/12.2275028

    (2017)

    Beitrag in Sammelwerk/Tagungsband
    • Gerald Fütterer

    Polarization-Fizeau interferometer enabling phase measurement with reduced uncertainty.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Christine Wünsche
    • Christian Schopf

    pg. 103260B

    DOI: 10.1117/12.2272001

    (2017)

    Beitrag in Sammelwerk/Tagungsband
    • Christian Vogt
    • O. Fähnle
    • Rolf Rascher

    Setting-up high-end cnc grinding processes: a Preston-based approach.

    (2017)

    Beitrag in Sammelwerk/Tagungsband
    • Christian J. Trum
    • Sebastian Sitzberger
    • Rolf Rascher

    Advanced method for the characterization of polishing suspensions.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Christine Wünsche
    • Christian Schopf

    pg. 103260I

    DOI: 10.1117/12.2272431

    (2017)

    Beitrag in Sammelwerk/Tagungsband
    • Robert Schneider
    • Alexander Haberl
    • Rolf Rascher

    Parametrization of a Subaperture Polishing Tool - Analysis of the Path Tests.

    • In:
    • OF&T
    • Fabrication
    • Optical Society of America
    • Optical Fabrication
    • OFT
    • Optical Design
    • OSA Optical Design
    • Testing
    • Fabrication Congress

    Washington, D.C., USA: OSA - The Optical Society vol. Paper OM3B.2

    (2017)

    Beitrag in Sammelwerk/Tagungsband
    • Christian Vogt
    • O. Fähnle
    • Rolf Rascher

    Force-controlled analysis tool for optimization of precision CNC grinding processes.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Christine Wünsche
    • Christian Schopf

    pg. 103260M

    DOI: 10.1117/12.2272713

    (2017)

    Beitrag in Sammelwerk/Tagungsband
    • Engelbert Hofbauer
    • Rolf Rascher
    • Felix Friedke
    • R. Kometer

    Resolution, measurement errors and uncertainties on deflectometric acquisition of large optical surfaces "DaOS".

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Christine Wünsche
    • Christian Schopf

    pg. 1032603

    DOI: 10.1117/12.2267513

    (2017)

    Beitrag in Sammelwerk/Tagungsband
    • Sebastian Sitzberger
    • Christian J. Trum
    • Rolf Rascher

    Analysis of the influence of the workpiece self-weight in precision optics manufacturing using FEM simulation.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Christine Wünsche
    • Christian Schopf

    pg. 103260O

    DOI: 10.1117/12.2273023

    (2017)

    Beitrag in Sammelwerk/Tagungsband
    • Bin Dong
    • Christian Vogt
    • Rolf Rascher

    Wear detection of brass bond diamond grinding wheel by spectral coherence of grinding forces.

    pg. 221-222

    (2017)

    Beitrag in Sammelwerk/Tagungsband
    • Robert Schneider
    • Alexander Haberl
    • Rolf Rascher

    Polishing tool and the resulting TIF for three variable machine parameters as input for the removal simulation.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Christine Wünsche
    • Christian Schopf

    pg. 1032602

    DOI: 10.1117/12.2267415

    (2017)

    Beitrag in Sammelwerk/Tagungsband
    • Olga Kukso
    • Rolf Rascher
    • R. Börret
    • M. Pohl

    On the metrology of the MSF errors.

    • In:
    • Rolf Rascher
    • Christian Schopf

    pg. 108290F

    DOI: 10.1117/12.2318675

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • M. Doetz
    • O. Fähnle
    • Christian Vogt

    SPDT and standard CNC-grinding of tungsten carbide molds for precision glass molding: an experimental process analysis.

    • In:
    • Rolf Rascher
    • Christian Schopf

    pg. 31

    DOI: 10.1117/12.2318710

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • Christian Vogt
    • O. Fähnle
    • Rolf Rascher

    gPVA: a system for the classification of grinding tools.

    • In:
    • Rolf Rascher
    • Christian Schopf

    pg. 26

    DOI: 10.1117/12.2318695

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • Sebastian Sitzberger
    • Christian J. Trum
    • Rolf Rascher
    • M. Zaeh

    Workpiece self-weight in precision optics manufacturing: compensation of workpiece deformations by a fluid bearing.

    • In:
    • Rolf Rascher
    • Christian Schopf

    pg. 108290A

    DOI: 10.1117/12.2318577

    (2018)

    Zeitschriftenartikel
    • O. Fähnle
    • Rolf Rascher
    • Christian Vogt
    • D.W. Kim

    Closed-loop laser polishing using in-process surface finish metrology.

    In: Applied Optics (vol. 57) , pg. 834-838

    (2018)

    DOI: 10.1364/AO.57.000834

    Abstract anzeigen

    This paper lays out the trail onto a closed-loop polishing process of optical elements enabling the application of the optimum polishing time needed. To that aim, an in-process testing method for monitoring an inclusive micro surface quality (e.g., comprising surface roughness and scratch-and-dig) within the polishing spot is analyzed and its applicability to closed-loop polishing for classical loose-abrasive full-aperture polishing as well as for computer controlled laser polishing is experimentally tested and verified. This enables the determination of the optimum local dwell time resulting in a stable and cost optimized polishing.
    Beitrag in Sammelwerk/Tagungsband
    • Christian J. Trum
    • Sebastian Sitzberger
    • Rolf Rascher

    Improved performance of CMP processes through targeted adjustment of polishing slurry and polish pad.

    • In:
    • Dae Kim
    • Rolf Rascher
    • R. Williamson

    San Diego, United States: SPIE pg. 20

    DOI: 10.1117/12.2321031

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • O. Fähnle
    • Christian Vogt
    • Rolf Rascher
    • M. Doetz
    • O. Dambon
    • F. Klocke

    Ductile grinding of tungsten carbide molds applying standard CNC machines.

    • In:
    • Dae Kim
    • Rolf Rascher
    • R. Williamson

    San Diego, United States: SPIE pg. 24

    DOI: 10.1117/12.2323245

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • O. Fähnle
    • Christian Vogt
    • Rolf Rascher
    • M. Doetz
    • O. Dambon
    • F. Klocke

    From turning to grinding: ductile machining with gPVA.

    • In:
    • Dae Kim
    • Rolf Rascher
    • R. Williamson

    San Diego, United States: SPIE pg. 30

    DOI: 10.1117/12.2323246

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • Alexander Haberl
    • Johannes Liebl
    • Rolf Rascher

    ABC-polishing.

    • In:
    • Rolf Rascher
    • Christian Schopf

    pg. 1082906

    DOI: 10.1117/12.2318549

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • Christian J. Trum
    • Christian Vogt
    • Sebastian Sitzberger
    • Rolf Rascher
    • O. Fähnle

    Filled-Up-Microscopy (FUM): a non-destructive method for approximating the depth of sub-surface damage on ground surfaces.

    • In:
    • Rolf Rascher
    • Christian Schopf

    pg. 11

    DOI: 10.1117/12.2318576

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • Christian Vogt
    • O. Fähnle
    • E. Langenbach
    • Rolf Rascher

    In situ monitoring of laser polishing.

    • In:
    • Deutsche Gesellschaft für angewandte Optik e.V.

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • Alexander Haberl
    • H. Harsch
    • Gerald Fütterer
    • Johannes Liebl
    • C. Pruß
    • Rolf Rascher
    • W. Osten

    Model based error separation of power spectral density artefacts in wavefront measurement.

    pg. 107490T

    DOI: 10.1117/12.2321106

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • O. Fähnle
    • M. Doetz
    • O. Dambon
    • F. Klocke
    • Christian Vogt
    • Rolf Rascher

    Ductile mode single point diamond turning (SPDT) of binderless tungsten carbide molds.

    • In:
    • Dae Kim
    • Rolf Rascher
    • R. Williamson

    San Diego, United States: SPIE pg. 15

    DOI: 10.1117/12.2323244

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • Christian Vogt
    • M. Doetz
    • Rolf Rascher
    • O. Fähnle

    Standardized evaluation of grinding tools for brittle and ductile mode grinding.

    • In:
    • The European Optical Society
    • Invited Paper.

    (2018)

    Vortrag
    • Christian J. Trum
    • Sebastian Sitzberger
    • Rolf Rascher

    Improved performance of CMP processes through targeted adjustment of polishing slurry and polish pad.

    San Diego, CA, USA 2018.

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • A. Harsch
    • C. Pruss
    • Alexander Haberl
    • W. Osten

    Tilted wave interferometry for testing large surfaces.

    • In:
    • Rolf Rascher
    • Christian Schopf

    pg. 1082908

    DOI: 10.1117/12.2318573

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • O. Fähnle
    • O. Dambon
    • M. Doetz
    • F. Klocke
    • Christian Vogt
    • Rolf Rascher

    Ductile grinding of tungsten carbide applying standard CNC machines: a process analysis.

    • In:
    • SPIE - The International Society for Optical Engineering

    pg. 34

    DOI: 10.1117/12.2315338

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • M. Doetz
    • O. Dambon
    • Christian Vogt
    • Rolf Rascher
    • E. Langenbach
    • O. Fähnle

    Enlarging process window of ductile mode machining of WC molds.

    • In:
    • The European Optical Society

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • O. Fähnle
    • Christian Vogt
    • Rolf Rascher

    Load controlled process window analysis of feed controlled CNC grinding.

    • In:
    • R. Geyl
    • S. Schröder

    Frankfurt, Germany: SPIE pg. 32

    DOI: 10.1117/12.2315336

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • M. Pohl
    • R. Börret
    • Rolf Rascher
    • Olga Kukso

    Simulation of MSF errors using Fourier transform.

    • In:
    • Rolf Rascher
    • Christian Schopf

    pg. 1082903

    DOI: 10.1117/12.2317484

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • Johannes Liebl
    • Christian Schopf
    • Rolf Rascher

    DefGO.

    • In:
    • Rolf Rascher
    • Christian Schopf

    pg. 108290I

    DOI: 10.1117/12.2318704

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • Gerald Fütterer
    • Johannes Liebl
    • Alexander Haberl

    Contribution of the phase transfer function of extended measurement cavities to mid spatial frequencies and the overall error budget.

    • In:
    • Rolf Rascher
    • Christian Schopf

    pg. 108290L

    DOI: 10.1117/12.2318711

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • Christian J. Trum
    • Christian Vogt
    • O. Fähnle
    • Sebastian Sitzberger
    • Rolf Rascher

    First experiences with Filled-Up-Microscopy (FUM) to evaluate the depth of sub-surface damages on ground surfaces.

    • In:
    • The European Optical Society

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • Christian Vogt
    • Rolf Rascher
    • O. Fähnle
    • Dae Kim

    Closed-loop next generation laser polishing.

    • In:
    • Rolf Rascher
    • Christian Schopf

    pg. 34

    DOI: 10.1117/12.2318749

    (2018)

    Zeitschriftenartikel
    • Christian J. Trum
    • Rolf Rascher
    • M. Zäh

    Effizientes chemisch-mechanisches Polieren (CMP).

    In: Werkstattstechnik online-wt-online , pg. 174-179

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • R. Kometer
    • Engelbert Hofbauer

    Fast and reliable in-situ measurements of large and complex surfaces using a novel deflectometric device.

    • In:
    • Rolf Rascher
    • Christian Schopf

    pg. 108290B

    DOI: 10.1117/12.2318583

    (2018)

    Vortrag
    • Christian Schopf
    • Florian Schneider
    • Rolf Rascher

    ArenA – Foi: Erprobung des ADAPT-Polierwerkzeugs. Posterpräsentation.

    • Technische Hochschule Deggendorf.

    Deggendorf 08.03.2018.

    (2018)

    Vortrag
    • Christian Vogt
    • Rolf Rascher

    grinding Process Validation Approach (gPVA). Posterpräsentation.

    • Technische Hochschule Deggendorf.

    Deggendorf 08.03.2018.

    (2018)

    Vortrag
    • Olga Kukso
    • Rolf Rascher
    • M. Pohl
    • R. Börret

    EmmaV - Entstehungsmechanismen mittelfrequenter Fehler und deren aktive Vermeidung. Posterpräsentation.

    • Technische Hochschule Deggendorf.

    Deggendorf 08.03.2018.

    (2018)

    Vortrag
    • Sebastian Sitzberger
    • Christian J. Trum
    • Rolf Rascher
    • M. Zaeh

    Workpiece self-weight induced deformation in precision optics manufacturing. Posterpräsentation.

    • Technische Hochschule Deggendorf.

    Deggendorf 08.03.2018.

    (2018)

    Vortrag
    • Christian Vogt
    • O. Fähnle
    • E. Langenbach
    • Rolf Rascher

    In situ laser monitoring of laser polishing.

    Technische Hochschule Aalen 23.05.2018.

    (2018)

    Vortrag
    • Rolf Rascher

    Grinding and polishing of glass - Basis for a perfect coating.

    Würzburg 11.06.2018.

    (2018)

    Vortrag
    • Alexander Haberl
    • H. Harsch
    • Gerald Fütterer
    • Johannes Liebl
    • C. Pruß
    • Rolf Rascher
    • W. Osten

    Model based error separation of power spectral density artefacts in wavefront measurement.

    San Diego, CA, USA 19.-23.08.2018.

    (2018)

    Vortrag
    • Rolf Rascher
    • Christian Vogt
    • O. Fähnle
    • E. Langenbach

    Closed-loop laser polishing of glass.

    • Fraunhofer-Institut für Lasertechnik (ILT).

    Aachen 12.09.2018.

    (2018)

    Vortrag
    • Christian J. Trum
    • Rolf Rascher
    • M. Zäh

    Steigerung der Effizienz chemisch-mechanischer Polierprozesse durch Anpassung der Poliersuspension.

    • Graduate Center der Munich School of Engineering.

    Garching 29.11.2018.

    (2018)

    Vortrag
    • Sebastian Sitzberger
    • Rolf Rascher
    • M. Zäh

    Vorrichtungssystem für eine beidseitige hochgenaue Bearbeitung von Linsen.

    • Graduate Center der Munich School of Engineering.

    Garching 29.11.2018.

    (2018)

    Beitrag in Sammelwerk/Tagungsband
    • Gerald Fütterer

    Wave front sensing for metrology by using optical filter.

    • In:
    • Rolf Rascher
    • Christian Schopf

    Bellingham, WA, USA pg. 111710K1-111710K11

    DOI: 10.1117/12.2530013

    (2019)

    Beitrag in Sammelwerk/Tagungsband
    • Jessica Stelzl
    • Christine Wünsche
    • S. Höfer

    Processing of a new nonlinear optical crystal for continuous wave UV-laser applications.

    • In:
    • Rolf Rascher
    • Christian Schopf

    Bellingham, WA, USA pg. 111710H1-111710H4

    DOI: 10.1117/12.2528140

    (2019)

    Beitrag in Sammelwerk/Tagungsband
    • Gerald Fütterer
    • Michael Wagner
    • Lucas Bauer
    • Simon Wittl

    Alignment and thermal drift aspects of a four-tilted-mirror student project telescope.

    • In:
    • Rolf Rascher
    • Christian Schopf

    Bellingham, WA, USA pg. 111710L1-111710L9

    DOI: 10.1117/12.2530076

    (2019)

    Beitrag in Sammelwerk/Tagungsband
    • M. Pohl
    • U. Bielke
    • R. Börret
    • Rolf Rascher
    • Olga Kukso

    MSF-error prevention strategies for the grinding process.

    • In:
    • Rolf Rascher
    • Christian Schopf

    Bellingham, WA, USA pg. 11171061-11171067

    DOI: 10.1117/12.2526581

    (2019)

    Beitrag in Sammelwerk/Tagungsband
    • Robert Wildenauer
    • Karl Leidl
    • Martin Schramm

    Hacking an optics manufacturing machine: You don't see it coming?!.

    • In:
    • Rolf Rascher
    • Christian Schopf

    Bellingham, WA, USA pg. 11171071-11171076

    DOI: 10.1117/12.2526691

    (2019)

    Beitrag in Sammelwerk/Tagungsband
    • Simon Killinger
    • Johannes Liebl
    • Rolf Rascher

    Mid-spatial frequency errors in feed direction occurring in ADAPT polishing.

    • In:
    • Rolf Rascher
    • Christian Schopf

    Bellingham, WA, USA pg. 111710G1-111710G8

    DOI: 10.1117/12.2528114

    (2019)

    Beitrag in Sammelwerk/Tagungsband
    • Michael Benisch
    • Werner Bogner
    • Rolf Rascher

    Using A Digital Temperature Sensor To Measure The Temperature Development During A Polishing Process.

    (2019)

    Beitrag in Sammelwerk/Tagungsband
    • Emilio Zambrano
    • Christine Wünsche
    • S. Mechold
    • S. Herr

    Cleaning effects in optical layers: error characteristics and analysis methods.

    • In:
    • Rolf Rascher
    • Christian Schopf

    Bellingham, WA, USA pg. 111710F1-111710F9

    DOI: 10.1117/12.2527974

    (2019)

    Beitrag in Sammelwerk/Tagungsband
    • Sebastian Sitzberger
    • Johannes Liebl
    • J. Reitberger
    • Rolf Rascher

    Zero-point clamping systems in optical production.

    • In:
    • Rolf Rascher
    • Christian Schopf

    Bellingham, WA, USA pg. 111710J1-111710J10

    DOI: 10.1117/12.2528774

    (2019)

    Vortrag
    • Sebastian Sitzberger
    • J. Reitberger
    • Rolf Rascher

    Clamping system for optical components for adaptation in optical production.

    • Physikalisch-Technische Bundesanstalt.

    Braunschweig 19.-20.03.2019.

    (2019)

    Vortrag
    • Sebastian Sitzberger
    • P. Rinck
    • A. Gueray
    • Rolf Rascher

    Ultraschallunterstützte Zerspanung von Advanced Materials.

    Jena 23.05.2019.

    (2019)

    Vortrag
    • Simon Killinger
    • Alexander Haberl
    • Rolf Rascher

    Analysis of residual errors during computer controlled polishing.

    • World of Photonics Congress.

    München 24.-26.06.2019.

    (2019)

    Vortrag
    • Christian J. Trum
    • Rolf Rascher
    • M. Zäh

    Steigerung der Effizienz chemisch-mechanischer Polierprozesse durch eine systematische Auswahl und Anpassung von Poliersuspension und Poliermittelträger.

    • Graduate Center der Munich School of Engineering.

    Garching 28.11.2019.

    (2019)

    Vortrag
    • Sebastian Sitzberger
    • Rolf Rascher
    • M. Zäh

    Steigerung von Fertigungsgenauigkeit und -geschwindigkeit bei der Herstellung von Präzisionslinsen.

    • Graduate Center der Munich School of Engineering.

    Garching 28.11.2019.

    (2019)

    Beitrag in Sammelwerk/Tagungsband
    • Armin Reif
    • Sebastian Sitzberger
    • Rolf Rascher

    Cutting high-performance materials with ultrasonically modulated cutting speed.

    • In:
    • Rolf Rascher
    • Alexander Haberl
    • O. Fähnle
    • Gerald Fütterer

    Bellingham, WA, USA

    DOI: 10.1117/12.2565757

    (2020)

    Zeitschriftenartikel
    • Armin Reif
    • P. Rinck
    • Sebastian Sitzberger
    • Rolf Rascher
    • M. Zäh

    Zerspanung von Hochleistungswerkstoffen mit ultrasonisch modulierter Schnittgeschwindigkeit.

    In: ZWF - Zeitschrift für wirtschaftlichen Fabrikbetrieb (vol. 115) , pg. 2-5

    (2020)

    DOI: 10.3139/104.112255

    Abstract anzeigen

    Die steigenden Anforderungen an die Festigkeit und die Qualität von Bauteilen und die damit verbundene Verwendung hochfester Materialien erfordert die Weiterentwicklung neuer wirtschaftlicher Zerspanungstechniken. Durch eine werkzeugseitige Schwingungsüberlagerung können bei der Bearbeitung von schwer zerspanbaren Werkstoffen die Zerspankräfte und der Werkzeugverschleiß reduziert sowie die Oberflächenqualität verbessert werden.
    Beitrag in Sammelwerk/Tagungsband
    • Olga Kukso
    • Rolf Rascher
    • M. Pohl
    • R. Börret

    On the metrology and analysis of MSF error.

    • In:
    • Rolf Rascher
    • Alexander Haberl
    • O. Fähnle
    • Gerald Fütterer

    Bellingham, WA, USA pg. 1147809

    DOI: 10.1117/12.2566251

    (2020)

    Beitrag in Sammelwerk/Tagungsband
    • Jessica Stelzl
    • Christine Wünsche
    • S. Höfer

    Influencing factors for a continuous wave UV-laser component.

    • In:
    • Rolf Rascher
    • Alexander Haberl
    • O. Fähnle
    • Gerald Fütterer

    Bellingham, WA, USA pg. 114780C

    DOI: 10.1117/12.2564916

    (2020)

    Zeitschriftenartikel
    • M. Pohl
    • Olga Kukso
    • R. Boerret
    • Rolf Rascher

    Mid-spatial frequency error generation mechanisms and prevention strategies for the grinding process.

    In: Journal of the European Optical Society, Rapid Publications (vol. 16)

    (2020)

    DOI: 10.1186/s41476-020-00140-9

    Abstract anzeigen

    The research presented in this paper is focused on the link between manufacturing parameters and the resulting mid-spatial frequency error in the manufacturing process of precision optics. The goal is to understand the generation mechanisms of mid-spatial frequency errors and avoid their appearance in the manufacturing process. Also, a simulation which is able to predict the resulting mid-spatial frequency error from a manufacturing process is developed and verified.
    Beitrag in Sammelwerk/Tagungsband
    • Simon Killinger
    • Johannes Liebl
    • Rolf Rascher

    Interferometric measurement with robot kinematics.

    • In:
    • Rolf Rascher
    • K. Dae Wook

    San Diego, United States: SPIE pg. 114870I

    DOI: 10.1117/12.2568348

    (2020)

    Beitrag in Sammelwerk/Tagungsband
    • M. Pohl
    • R. Börret
    • Olga Kukso
    • Rolf Rascher

    Mid spatial frequency error prevention strategies for the grinding process.

    • In:
    • Rolf Rascher
    • Alexander Haberl
    • O. Fähnle
    • Gerald Fütterer

    Bellingham, WA, USA pg. 114780E

    DOI: 10.1117/12.2565261

    (2020)

    Beitrag in Sammelwerk/Tagungsband
    • Christian J. Trum
    • M. Jung
    • Beate Schmidbauer
    • Sebastian Sitzberger
    • E. Willenborg
    • Rolf Rascher

    Hybrid-process-chain for polishing optical glass lenses – HyoptO.

    • In:
    • Rolf Rascher
    • K. Dae Wook

    San Diego, United States: SPIE pg. 114871L

    DOI: 10.1117/12.2568400

    (2020)

    Beitrag in Sammelwerk/Tagungsband
    • M. Jung
    • Christian J. Trum
    • Beate Schmidbauer
    • E. Willenborg
    • Rolf Rascher

    Non-ablative removal of sub surface damages in ground optical glass substrates by controlled melting of thin surface layers using CO2-laser radiation.

    • In:
    • Rolf Rascher
    • Alexander Haberl
    • O. Fähnle
    • Gerald Fütterer

    Bellingham, WA, USA pg. 1147804

    DOI: 10.1117/12.2564801

    (2020)

    Beitrag in Sammelwerk/Tagungsband
    • Simon Killinger
    • Johannes Liebl
    • Rolf Rascher

    First steps towards an automated polishing process chain using one robot.

    • In:
    • Rolf Rascher
    • Alexander Haberl
    • O. Fähnle
    • Gerald Fütterer

    Bellingham, WA, USA pg. 114780I

    DOI: 10.1117/12.2564840

    (2020)

    Beitrag in Sammelwerk/Tagungsband
    • Michael Benisch
    • O. Fähnle
    • Rolf Rascher

    Application of a pressure measuring film for pressure observation in overarm polishing.

    • In:
    • The European Optical Society

    DOI: 10.1051/epjconf/202023803003

    (2020)

    Beitrag in Sammelwerk/Tagungsband
    • Michael Wagner
    • Gerald Fütterer

    Computer-aided beam path generation and assessment for Stevick-Paul telescopes.

    • In:
    • Rolf Rascher
    • Alexander Haberl
    • O. Fähnle
    • Gerald Fütterer

    Bellingham, WA, USA pg. 114780B

    DOI: 10.1117/12.2564852

    (2020)

    Beitrag in Sammelwerk/Tagungsband
    • Michael Benisch
    • Christian Vogt
    • Rolf Rascher
    • O. Fähnle

    Octopus: A simple and effective tool for polishing slurry monitoring.

    • In:
    • Rolf Rascher
    • K. Dae Wook

    San Diego, United States: SPIE

    DOI: 10.1117/12.2567952

    (2020)

    Beitrag in Sammelwerk/Tagungsband
    • Michael Benisch
    • O. Fähnle
    • Rolf Rascher

    Observation of pressure distribution between tool and surface in different polishing situations.

    • In:
    • Rolf Rascher
    • K. Dae Wook

    San Diego, United States: SPIE pg. 1148704

    DOI: 10.1117/12.2567885

    (2020)

    Beitrag in Sammelwerk/Tagungsband
    • Sebastian Sitzberger
    • Johannes Liebl
    • Christian J. Trum
    • Rolf Rascher

    Concept of a two-part clamping system for lenses in optical metrology.

    • In:
    • Rolf Rascher
    • Alexander Haberl
    • O. Fähnle
    • Gerald Fütterer

    Bellingham, WA, USA pg. 114780G

    DOI: 10.1117/12.2566547

    (2020)

    Beitrag in Sammelwerk/Tagungsband
    • Michael Benisch
    • O. Fähnle
    • Rolf Rascher
    • Werner Bogner

    Force and pressure analysis during overarm polishing.

    • In:
    • Rolf Rascher
    • Alexander Haberl
    • O. Fähnle
    • Gerald Fütterer

    Bellingham, WA, USA pg. 114780H

    DOI: 10.1117/12.2564903

    (2020)

    Vortrag
    • M. Jung
    • Christian J. Trum
    • Rolf Rascher

    Hybrid Process Chain for Polishing of Optics Made from Glass.

    • Fraunhofer-Institut für Lasertechnik (ILT).

    Aachen (video conference) 16.09.2020.

    (2020)

    Vortrag
    • Rolf Rascher

    Produktion aus dem Home Office – Fiktion oder Zukunftsmodell.

    • Firma Stock Konstruktion.

    Online 23.11.2020.

    (2020)

    Vortrag
    • Sebastian Sitzberger
    • M. Zäh
    • Rolf Rascher

    Untersuchungen zu einer durchgängigen Werkstückaufnahme für die Herstellung von Hochpräzisionsoptiken.

    • Graduate Center der Munich School of Engineering.

    Garching 26.11.2020.

    (2020)

    Vortrag
    • Christian J. Trum
    • M. Zäh
    • Rolf Rascher

    Steigerung der Effizienz chemisch-mechanischer Polierprozesse durch eine systematische Auswahl und Anpassung von Poliersuspension und Poliermittelträger.

    • Graduate Center der Munich School of Engineering.

    Garching 26.11.2020.

    (2020)

    Beitrag (Tagungsband)

    Proceedings of SPIE 11853 (Eighth European Seminar on Precision Optics Manufacturing, 100090Y [April 13th-14th, 2021, Teisnach]).

    SPIE, Society of Photo-Optical Instrumentation Engineers. (vol. Volume 11853)

    (2021)

    Beitrag in Sammelwerk/Tagungsband
    • Stefan Anthuber
    • Michael Benisch
    • Rolf Rascher

    Industry 4.0 in the fabrication of optical components: development, presence, and requirements.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Alexander Haberl
    • Gerald Fütterer

    SPIE, Society of Photo-Optical Instrumentation Engineers pg. 118530D

    DOI: 10.1117/12.2595037

    (2021)

    Beitrag in Sammelwerk/Tagungsband
    • Olga Kukso
    • Michael Benisch
    • Rolf Rascher
    • S. Sundar
    • M. Hacker
    • M. Duschl
    • M. Nussbaum

    Acoustic measurements for optics.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Alexander Haberl
    • Gerald Fütterer

    SPIE, Society of Photo-Optical Instrumentation Engineers pg. 118530K

    (2021)

    Beitrag in Sammelwerk/Tagungsband
    • David Moszko
    • O. Fähnle
    • Christian Vogt
    • D.W. Kim

    In-process surface roughness measuring device for information-based real-time polishing process adjustment and optimization.

    • In:
    • Rolf Rascher
    • O. Fähnle
    • Alexander Haberl
    • Gerald Fütterer

    SPIE, Society of Photo-Optical Instrumentation Engineers pg. 118530E

    DOI: 10.1117/12.2596034

    (2021)