Publikationen


Suche nach „[Rascher] [Rolf]“ hat 185 Publikationen gefunden
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    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Christian Vogt, Martin Rohrbacher, Rolf Rascher, S. Sinzinger

    Dependency between removal characteristics and defined measurement categories of pellets

    Proceedings of SPIE 9573

    ISBN: 978-1628417395

    DOI: 10.1117/12.2189987

    Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Vortrag

    Heiko Biskup, Rolf Rascher, Christine Wünsche

    Poliermittelerprobung I

    Spectaris - 4. Treffen des Industriekonsortiums Seltene Erden, Teisnach

    Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Vortrag

    Heiko Biskup, Rolf Rascher, Christine Wünsche

    Laserdiffraktometrie - Korngrößenverteilung in Poliermitteln

    Posterbeitrag

    5. Optikseminar, Teisnach

    Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Vortrag

    Heiko Biskup, Rolf Rascher, Christine Wünsche

    Poliermittelerprobung II

    Spectaris - 6. Treffen des Industriekonsortiums Seltene Erden, Mainz

    Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Vortrag

    Heiko Biskup, Rolf Rascher, Christine Wünsche

    Laserdiffraktometrie zur Charakterisierung von Korngrößen und deren Verteilung in Poliermitteln

    5. Optikseminar, Teisnach

    Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Zeitschriftenartikel

    Johannes Liebl, Heiko Biskup, Sebastian Draxinger, Rolf Rascher, Christine Wünsche

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

    International Journal of Metrology and Quality Engineering (EDP Sciences), vol. 5, no. 1, pp. 29-35

    Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder 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

    Proceedings of EOSAM 2014 (European Optical Society Annual Meeting) [Sep 15-19 2014, Berlin, Germany]

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Zeitschriftenartikel

    Heiko Biskup, Christian J. Trum, Rolf Rascher

    Stabilität im Polierprozess

    Newsletter Bayern Photonics (Innovationsnetzwerk Optische Technologien), no. Oktober

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Heiko Biskup, Alexander Haberl, Rolf Rascher

    Surface errors in the course of machining precision optics

    Proceedings of SPIE Volume 9575, Optical Manufacturing and Testing XI (Aug 27th 2016, San Diego, CA)

    DOI: 10.1117/12.2189991

    Abstract anzeigen

    Precision optical components are usually machined by grinding and polishing in several steps with increasing accuracy. Spherical surfaces will be finished in a last step with large tools to smooth the surface. The requested surface accuracy of non-spherical surfaces only can be achieved with tools in point contact to the surface. So called mid-frequency errors (MSFE) can accumulate with zonal processes. This work is on the formation of surface errors from grinding to polishing by conducting an analysis of the surfaces in their machining steps by non-contact interferometric methods. The errors on the surface can be distinguished as described in DIN 4760 whereby 2nd to 3rd order errors are the so-called MSFE. By appropriate filtering of the measured data frequencies of errors can be suppressed in a manner that only defined spatial frequencies will be shown in the surface plot. It can be observed that some frequencies already may be formed in the early machining steps like grinding and main-polishing. Additionally it is known that MSFE can be produced by the process itself and other side effects. Beside a description of surface errors based on the limits of measurement technologies, different formation mechanisms for selected spatial frequencies are presented. A correction may be only possible by tools that have a lateral size below the wavelength of the error structure. The presented considerations may be used to develop proposals to handle surface errors. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Christian J. Trum, Rolf Rascher

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

    Proceedings of SPIE 10009 (Third European Seminar on Precision Optics Manufacturing, 100090Y [April 12th 2016, Teisnach])

    DOI: 10.1117/12.2236000

    Abstract anzeigen

    During design of optical systems or individual components, customers and designers already predetermine the way through production and the necessary resources. They define the tolerances that are required for their application like shape, micro-roughness and cleanliness, as well as the glass material that is necessary for the targeted optical effect. By the tolerances, they have also an influence on the manufacturer and his decisions on the production environment, measurement technology and the process chain that in his opinion is necessary to meet the specification. In most cases the type of polishing suspension and its parameters are also predetermined by the use of central polishing supply systems. With this paper, the authors want to give a prospect of a currently running research with the aim of increasing the efficiency of chemo-mechanical polishing processes by a systematic selection and conditioning of the polishing suspension. They want to show that small amounts of well-conditioned and stabilized polishing suspension could be a tool to improve the efficiency in CMP processes under the influence of the global trend to products that are more individual and down to one piece flow production. Main parts of this research are the identification of influences of polishing suspensions on the quality criteria of optical components and the creation of a method to find well-working suspension parameters in a deterministic and reproducible way. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder 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

    Proceedings of SPIE 10009 (Third European Seminar on Precision Optics Manufacturing, 100090Y [April 12th 2016, Teisnach])

    DOI: 10.1117/12.2236134

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Johannes Liebl, Horst Linthe, Sebastian Sitzberger, Rolf Rascher

    Interferometric measurement of highly accurate flat surfaces

    Proceedings of SPIE 10009 (Third European Seminar on Precision Optics Manufacturing, 100090Y [April 12th 2016, Teisnach])

    DOI: 10.1117/12.2235525

    Abstract anzeigen

    The most important part in manufacturing precision optics is a reliable measurement procedure which provides results a few times more accurate than the quality to be produced. In general two specific values are important, the repeatability of several measurements which are done in a row and the absolute accuracy which is mostly defined by the systematical error of the measurement device. The repeatability can be improved relatively simple, by increasing the number of measurements and a following averaging step. To increase the absolute accuracy of a measurement device in the field of precision optics is far more challenging. In this paper several interferometer absolute testing methods to measure flat surfaces are compared. The main objective was to name a value for the achievable accuracy. Therefor four different methods were analyzed: 1. The three flat test, a method which is already used several decades to determine the quality of a flat surface. As a result, two absolute measured profiles, horizontal and vertical, can be calculated. 2. The multi rotation test, an extension of the classical three flat test. The big advantage of this method is a fully three dimensional map of the systematical error. 3. The systematical error calculated by the SSI-A. Hereby several subapertures are measured over the whole surface. The redundant information’s of the overlapping regions can be used to calculate the systematical error of the system. 4. The rotation of the transmission flat relatively to the interferometer. Thereby the rotation unsymmetrical errors can be calculated and subtracted. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Sebastian Sitzberger, Rolf Rascher

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

    Proceedings of SPIE 10009 (Third European Seminar on Precision Optics Manufacturing, 100090Y [April 12th 2016, Teisnach])

    DOI: 10.1117/12.2236137

    Abstract anzeigen

    By adaption and coordination of successive process steps the efficiency of producing optics can be improved. In the beginning of this investigation, the focus is on two crucial process steps of the optical manufacturing process. First, there is the optical and mechanical design of the optical part and system. In this context, it is important to consider what modifications compared to the current standard design are possible respectively useful. Thus, the modifications will only concentrate on parts of the optic that do not interfere with the optical functionality. Furthermore in this part of the study the main aspect is the clamping situation of the optical part in a holder or an optical system. It will be discussed, whether it is useful to add special clamping surfaces respectively a clamping flange in contrast to the standard design. The faultless functioning of the optics has always first priority. Second, the manufacturing process itself has a great number of single steps. Therefore, a main part of the research is the investigation of current clamping situations in optics manufacturing, with prospect to improve them in order to work perfectly with the design modifications, as mentioned above. This part of the investigation focuses on the clamping system for the lens on each machine necessary for manufacturing. In the scope of this paper the authors want to summarize characteristics and deficits of current clamping systems and workpiece mounts and give a prospect of the following course of action. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

    Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Vortrag

    Rolf Rascher

    Innovationsentwicklung mit der Technischen Hochschule Deggendorf

    Innovationsworkshop "Innovation in der Photonik" im Rahmen der 13. Optatec 2016 - Internationale Fachmesse für optische Technologien, Komponenten und Systeme, Frankfurt am Main

    Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Vortrag

    Rolf Rascher, Christine Wünsche, Christian Schopf

    Aspects in laser polishing of precision optical components

    LaP 2016 - 2nd Conference on Laser Polishing, Aachen

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder 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

    DGaO Proceedings (116. Jahrestagung in Brno, Tschechische Republik, 25.-29.05.2015)

    Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    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

    6. Fachtagung Produktionsmesstechnik für die Praxis, Buchs, Schweiz

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Patrick Schäfer, Christine Wünsche, Rolf Rascher

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

    Proceedings of SPIE 9442

    Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Vortrag

    Patrick Schäfer, Christine Wünsche, Rolf Rascher

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

    Optics and Measurement International Conference 2014, Liberec, Tschechische Republik

    Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Vortrag

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

    Aims for the development of new optical glass materials

    1st European Seminar on Precision Optics Manufacturing, Teisnach