Suche nach „[Trum] [Christian J.]“ hat 20 Publikationen gefunden

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Beitrag (Sammelband oder Tagungsband)

O. Fähnle, Christian Vogt, Rolf Rascher, Christian J. Trum, Sebastian Sitzberger

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

Proceedings of EOSAM 2018 (European Optical Society Biennial Meeting; October 2018; Delft, The Netherlands): Optical System Design, Tolerancing, and Fabrication

2018

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Zeitschriftenartikel

Rolf Rascher, Christian J. Trum, M. Zäh

Effizientes chemisch-mechanisches Polieren (CMP)

Werkstattstechnik online-wt-online, no. 3, pp. 174-179

2018

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Beitrag (Sammelband oder Tagungsband)

Rolf Rascher, Christian J. Trum, Sebastian Sitzberger

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

Proceedings of SPIE Optical Engineering + Applications (19-23 August, 2018; Optical Manufacturing and Testing XII; San Diego, CA, USA), San Diego, United States, vol. 10742

2018

ISBN: 978-1-5106-2055-1

DOI: 10.1117/12.2321031

Abstract anzeigen

Chemical-mechanical polishing (CMP) of optical glasses is widespread and forms the basis for many high-precision polishing processes. The pads, slurries and glass materials used in polishing have many different properties. The effects of these properties on the process results are often unknown. The right choice and combination is therefore often a challenge. By means of a plan processing of N-BK7 and SF56 samples by a plan-polishing process, the influence on the process results, material removal rate (MRR), micro roughness and cleanliness caused by slurry and polishing pad is shown. It turns out that the type of polish pad has the biggest impact on the results. The easy-to-process material N-BK7 shows only little influence by the type of slurry used. The more challenging SF56, however, shows significant effects, especially in the area of the resulting micro roughness and the appearance of surface damages like orange peel. Especially the use of Auerpol® PZ500 shows clear advantages here. For a selection of three out of nine polishing pads, the effect of density variation of the slurry was also investigated. Lower particle concentrations lead to lower material removal rates. This applies to both materials. The more sensitive SF56 shows a reduction in micro roughness by the use of a less dense slurry. The correct selection of the polishing pad has a positive effect on the material removal rate and/or the micro roughness in all tested materials. An adaptation of the type and concentration of the slurry is especially important for more sensitive materials and in combination with the right polishing pad. In view of the development towards special materials and small lot sizes, the targeted and correct selection of polishing slurries and pads becomes more and more important. The information required for this purpose on the behavior of the pads and slurries available on the market must therefore first be determined in a targeted manner and clearly presented.

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Beitrag (Sammelband oder Tagungsband)

O. Fähnle, Christian Vogt, Rolf Rascher, Christian J. Trum, Sebastian Sitzberger

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

Proceedings of SPIE 10829 (Fifth European Seminar on Precision Optics Manufacturing [April 10-11, 2018; Teisnach])

2018

ISBN: 978-1-5106-2270-8

DOI: 10.1117/12.2318576

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Beitrag (Sammelband oder Tagungsband)

Rolf Rascher, M. Zaeh, Christian J. Trum, Sebastian Sitzberger

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

Proceedings of SPIE 10829 (Fifth European Seminar on Precision Optics Manufacturing [April 10-11, 2018; Teisnach])

2018

ISBN: 978-1-5106-2270-8

DOI: 10.1117/12.2318577

Abstract anzeigen

The effects, the extent and the importance of workpiece deformations, particularly lenses, caused by the weight of the workpiece itself, were examined in a previous paper1 . The considered deformations are in the single-digit to two-digit nanometer range. The investigation was carried out by FEM calculations. The conclusion of the previous aper was that a full-surface support of a workpiece in the processing of one surface presumably produces the best results. Furthermore, it was found that if the second functional surface is not to be touched in the process, a full contact lens mounting on its circumference is advisable. An alternative method for fixing precision lenses is therefore desirable. This can be accomplished in two steps. As a first step, the lens must be gripped at its periphery so that none of the optically functional surfaces of the lens is compromised. However, the complete circumference has to be fixated gaplessly because a punctual fixation has the disadvantage of deforming the lens surface asymmetrically. As a second step, the freely hanging lens surface should be supported to minimize deformation. An approach had to be found that supports the surface like a solid bearing but at the same time does not touch it. Therefore, the usage of an incompressible fluid as a hydrostatic bearing for full-surface support is pursued. For this purpose, the bottom side of the lens has to be stored on water. The results of the FEM simulation showed that with a fluid bearing the resulting deformations can be drastically reduced in comparison to a freely hanging surface. Furthermore, under the right conditions, a resulting deformation comparable to a full surface solid support can be achieved. The content of this paper is a test series under laboratory conditions for a first validation of the theoretical results. Therefore, a prototype model to test a lens fixation with a fluid bearing was developed and manufactured. The resulting deformations were measured with an interferometer and the effects are discussed.

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Beitrag (Sammelband oder Tagungsband)

Rolf Rascher, Christian J. Trum, Sebastian Sitzberger

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

Proceedings of SPIE 10326 (Fourth European Seminar on Precision Optics Manufacturing, 1032601 [April 4th-5th 2017, Teisnach])

2017

DOI: 10.1117/12.2273023

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Beitrag (Sammelband oder Tagungsband)

Rolf Rascher, Christian J. Trum, Sebastian Sitzberger

Advanced method for the characterization of polishing suspensions

Proceedings of SPIE 10326 (Fourth European Seminar on Precision Optics Manufacturing, 1032601 [April 4th-5th 2017, Teisnach])

2017

DOI: 10.1117/12.2272431

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Beitrag (Sammelband oder Tagungsband)

Christian J. Trum, Robert Schneider

Hexapod as primary kinematic system for applications in the optic industry

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

2016

DOI: 10.1117/12.2235400

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Beitrag (Sammelband oder Tagungsband)

Rolf Rascher, Christian J. Trum

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])

2016

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.

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Zeitschriftenartikel

Heiko Biskup, Rolf Rascher, Christian J. Trum

Stabilität im Polierprozess

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

2015

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Beitrag (Sammelband oder Tagungsband)

Christine Wünsche, Heiko Biskup, Roland Maurer, Rolf Rascher, Christian J. Trum

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

Optifab 2013, vol. Volume 8884

2013

ISBN: 9780819497475

DOI: 10.1117/12.2028752

Abstract anzeigen

In 2012 a well-known company in the field of high precision optics assigned the University of Applied Sciences Deggendorf to determine a suitable parameter field for the active fluid jet polishing (AFJP) process in order to reach a surface accuracy of at least lambda / 5. The active fluid jet polishing is a relatively new and an affordable sub-aperture polishing process. For a fast and precise identification of the parameter field a considered design of experiment is necessary. The available control variables were the rotational speed of the nozzle, the distance between the test object and the jet, the feed rate, the material of the pin inside the nozzle and the material of the test object itself. In order to reach a significant data density on the one hand and to minimize the number of test runs on the other hand a meander shaped tool path was chosen. At each blank nine paths had been driven whereby at each path another parameter combination was picked. Thus with only one test object nine parameter settings may be evaluated. For the automatized analysis of the tracks a software tool was developed. The software evaluates ten sections which orthogonally intersect the nine tracks on the test-lens. The significant measurement parameters per section are the width and the height of each path as well as the surface roughness within the polished tracks. With the aid of these parameters and further statistical evaluations a suitable parameter field for the goal to find a constant and predictable removal spot was determined. Furthermore up to now over 60 test runs have been successfully finished with nine parameter combinations in each case. As a consequence a test evaluation by hand would be very time-consuming and the software facilitates it dramatically.

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Vortrag

Rolf Rascher, Christian J. Trum, Sebastian Sitzberger

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

SPIE Optical Engineering + Applications 2018, San Diego, CA, USA

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Vortrag

Christian J. Trum

The critical success factor slurry in the polishing process

Workshop "Glas?Klar! Clear as Glass"

92. Glastechnische Tagung 2018 der HVG-DGG, Bayreuth

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Vortrag

Christian J. Trum

Erweiterte Methode zur Charakterisierung von Poliersuspensionen

Posterpräsentation

5. Tag der Forschung, Deggendorf

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Vortrag

Rolf Rascher, M. Zaeh, Christian J. Trum, Sebastian Sitzberger

Workpiece self-weight induced deformation in precision optics manufacturing

Posterpräsentation

5. Tag der Forschung, Deggendorf

Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

Vortrag

Heiko Biskup, Christian J. Trum

Reduzierter Versuchsumfang durch gezielte Versüchsführung am Beispiel des „Active Fluid Jet Polishing“

6. Optikseminar - Agenda zur modernen Optikfertigung, Teisnach

Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

Vortrag

Christine Wünsche, Heiko Biskup, Rolf Rascher, Sebastian Draxinger, Christian J. Trum

Active Fluid Jet Polishing - Behaviour on Different Materials

Optical Fabrication and Testing (OF&T), Kohala Coast, HI, USA

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Vortrag

Christian Vogt, Heiko Biskup, Christian J. Trum

AFJP – A review of a sub-aperture polishing technology

EOS Conferences at the World of Photonics Congress, München

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Vortrag

Heiko Biskup, Christian J. Trum

Active Fluid Jet Polishing – Verhalten auf verschiedenen Glasmaterialien

1. Tag der Forschung, Deggendorf

Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

Vortrag

Heiko Biskup, Christian J. Trum

Active Fluid Jet Polishing – Verhalten auf verschiedenen Glasmaterialien

6. Optikseminar - Agenda zur modernen Optikfertigung, Teisnach