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Suche nach „[Trum] [Christian J.]“ hat 26 Publikationen gefunden

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Beitrag (Sammelband oder 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

Proceedings of SPIE 11478 (Seventh European Seminar on Precision Optics Manufacturing [8 July 2020; Teisnach]), Bellingham, WA, USA

DOI: 10.1117/12.2564801

Abstract anzeigen

The form generation of optical surfaces by grinding and mechanical polishing results in small sub surface damages in the form of micro cracks that conventionally have to be removed by further removal of the damaged surface layers. In order to reduce process time and material cost non-ablative methods for removal of micro cracks are desired. Utilising the low optical penetration depths of less than 10 μm for CO2-laser radiation in glass, the laser energy can be used to heat up and melt thin surface layers. Using a 1.5 kW CO2-laser, a quasi-line focus formed by a scanner unit and a constant feed speed, it is possible to close all micro cracks present in the rough grinded test surfaces (max. SSD-depth ~ 63 μm), while achieving a process time of less than 2 seconds for a Ø 30 mm N-BK7 lens, respectively 7.5 seconds for fused silica. With a Sa as low as 50 nm and low distortion from the original shape the surfaces can directly be conventionally polished, further reducing the process chain complexity.

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Beitrag (Sammelband oder Tagungsband)

Sebastian Sitzberger, Johannes Liebl, Christian J. Trum, Rolf Rascher

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

Proceedings of SPIE 11478 (Seventh European Seminar on Precision Optics Manufacturing [8 July 2020; Teisnach]), Bellingham, WA, USA

DOI: 10.1117/12.2566547

Abstract anzeigen

The developed concept represents a universally applicable clamping system designed to fit in any measuring machine with any measuring principle. The design ensures that, as long as the lens remains clamped, the measurement results are reproducible. Form errors due to tension remain constant across all measuring and processing steps. The version presented in this paper was developed especially for small lenses in the diameter range up to 40 mm. On the one hand, the design allows for fast measurement of loose lenses. On the other hand, the device can also be used for measurement comparisons, since lenses can also be mounted permanently. In the following, the concept and first results of measurement tests are presented.

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Patent

Christian J. Trum, Sebastian Sitzberger

Kühlsystem für eine Ultraschall-Bohrmaschine

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Patent

Christian J. Trum, Sebastian Sitzberger

Kühlsystem für eine Ultraschall-Handbohrmaschine, Ultraschall-Handbohrmaschine sowie Verfahren zum Kühlen einer Schwingungserregereinheit einer Ultraschall-Handbohrmaschine

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Patent

Christian J. Trum, Sebastian Sitzberger

Akkubetriebene Ultraschall-Handbohrmaschine sowie Verfahren zum Betreiben einer solchen Ultraschall-Handbohrmaschine

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Patent

Sebastian Sitzberger, Christian J. Trum, Michael Benisch

Ultraschall-Handbohrmaschine und Verfahren zum Betreiben einer Ultraschall-Handbohrmaschine

Digital Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Beitrag (Sammelband oder 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

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

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Vortrag

Christian J. Trum, Sebastian Sitzberger, Rolf Rascher

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

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

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

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

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Zeitschriftenartikel

Christian J. Trum, Rolf Rascher, M. Zäh

Effizientes chemisch-mechanisches Polieren (CMP)

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

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Beitrag (Sammelband oder Tagungsband)

Christian J. Trum, Sebastian Sitzberger, Rolf Rascher

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

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.

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Beitrag (Sammelband oder 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

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

ISBN: 978-1-5106-2270-8

DOI: 10.1117/12.2318576

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Beitrag (Sammelband oder 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

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

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.

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

Vortrag

Christian J. Trum

Erweiterte Methode zur Charakterisierung von Poliersuspensionen

Posterpräsentation

5. Tag der Forschung, Deggendorf

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Vortrag

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

Workpiece self-weight induced deformation in precision optics manufacturing

Posterpräsentation

5. Tag der Forschung, Deggendorf