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Vortrag

F: Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen I: Hochschulleitung und -einrichtungen

Sturktur der Technologiecampi der Hochschule Deggendorf im Bayerischen Wald

Runder Tisch Wirtschaft, Regen

2010

Beitrag (Sammelband oder Tagungsband)

Christian Schopf, Rolf Rascher, Peter Sperber

Vor- und Nachteile der Ultraschalltechnologie beim Schleifen von optischen Flächen

Achtes Symposium - Zukunft Glas - von der Tradition zum High-Tech-Produkt

2010

F: Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen I: Hochschulleitung und -einrichtungen

Vortrag

Christian Schopf, Rolf Rascher, Peter Sperber

Vor- und Nachteile der Ultraschalltechnologie beim Schleifen von optischen Flächen

Achtes Symposium - Zukunft Glas - von der Tradition zum High-Tech-Produkt, Zwiesel

2010

F: Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen I: Hochschulleitung und -einrichtungen

Vortrag

Christian Schopf, Peter Sperber, Rolf Rascher

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

Achtes Symposium - Zukunft Glas - von der Tradition zum High-Tech-Produkt, Zwiesel

2010

Vortrag

Vision Technologieregion Bayerischer Wald - Regionalisierung der Hochschule Deggendorf

Glasforum Bayerischer Wald, Zwiesel

2010

Vortrag

F: Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen F: Maschinenbau und Mechatronik I: Hochschulleitung und -einrichtungen

Regionalisierung der Hochschule Deggendorf - Technologieregion Bayerischer Wald

2010

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 Optifab, Rochester, NY, USA

2009

The demand for non-spherical surfaces and free-forms is steadily growing. Aspherical lenses can reduce the number of necessary lenses in optical systems e.g. used for lithographic devices for production of microprocessors. Parabolic mirrors can be used to focus light beams highly efficiently because of low absorption rates without colour distortion. Combined optical devices with included mechanical functions for assembly reduce necessary production steps. The most common pre-machining method for small numbers of high-precision lenses and mirrors is grinding. Depending on the required shape there are different options for generating surfaces e. g. spheres, parabolic mirrors or combined forms. The most flexible ones are grinding with (i) workpiece and ball-shaped tool rotating and (ii) fixed workpiece with ball-shaped tool rotating. In this manuscript grinding strategies dealing with meander and spiral tool paths are investigated in order to define which strategy works best for machining off-axis parabolic mirrors.

Vortrag

Optoelectronic Distance Measurement (invited review lecture)

1st International Workshop on Novel Developments and Applications in Sensor Technology, Coburg

2009

Vortrag

F: Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen F: Maschinenbau und Mechatronik I: Hochschulleitung und -einrichtungen

Regional Technology Transfer Centers of the University of Applied Sciences Deggendorf: Efficient promotion of strucural and economic development

BAYHOST - Donauforum, Regensburg

2009

Vortrag

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

Ultraschallunterstütztes Schleifen von Linsen

Siebtes Symposium - Zukunft Glas - von der Tradition zum High-Tech-Produkt, Zwiesel

2008

F: Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen F: Maschinenbau und Mechatronik I: Hochschulleitung und -einrichtungen

Vortrag

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

Precision finishing of aspherical optical components using ELID grinding

Siebtes Symposium - Zukunft Glas - von der Tradition zum High-Tech-Produkt, Zwiesel

2008

F: Elektrotechnik und Medientechnik I: Hochschulleitung und -einrichtungen

Beitrag (Sammelband oder Tagungsband)

Josef Kölbl, M. Fröschl, A. Seedsman, Peter Sperber

Near-Infrared Laser Range Finder, using kHz Repetition Rate

SPIE Proceedings Vol. 7115

2008

DOI: 10.1117/12.800132

F: Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen F: Maschinenbau und Mechatronik I: Hochschulleitung und -einrichtungen

The paper deals with laser range finding (LRF) technology for tracking fast-moving objects with kHz laser repetition rates. The LRF is based on time-of-flight measurement, where a short emitting laser pulse is transmitted and its time-of-flight is accurately measured by the electronics with respect to the received impulse from a non-cooperative target. The emitted laser energy is in the near infrared wavelength region. The detector is based on a single-photon detection principle of a silicon Avalanche photodiode, operated in so-called Geiger mode. A solution was devised to utilise single photon detection even at strong daylight conditions. The LRF has been integrated in a robust and compact technology demonstrator, and has successfully ranged to rapidly-moving and accelerating small targets. A detailed mathematical model was developed to predict the ranging performance of the LRF for evolution of application-specific designs. The current technology allows ranging up to a maximum range of 1.5 km with ± 0.5 m accuracy against large stationary targets, as well as tracking of small targets of 75 mm diameter moving up to a range of 300 m with a speed resolution of ± 5 m/s. The LRF device uses a standard serial protocol for device communication and control, and operates at a temperature range from 0 °C - 55 °C.

Beitrag (Sammelband oder Tagungsband)

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

Ultraschallunterstütztes Schleifen von Linsen

Siebtes Symposium - Zukunft Glas - von der Tradition zum High-Tech-Produkt

2008

F: Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen F: Maschinenbau und Mechatronik I: Hochschulleitung und -einrichtungen

Beitrag (Sammelband oder Tagungsband)

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

Precision finishing of aspherical optical components using ELID grinding

Siebtes Symposium - Zukunft Glas - von der Tradition zum High-Tech-Produkt

2008

F: Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen F: Elektrotechnik und Medientechnik F: Maschinenbau und Mechatronik I: Hochschulleitung und -einrichtungen

Zeitschriftenartikel

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

Advanced techniques for computer-controlled polishing

Current Developments in Lens Design and Optical Engineering IX, vol. 7060, no. 70600Q ff.

2008

DOI: 10.1117/12.808036

F: Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen F: Maschinenbau und Mechatronik I: Hochschulleitung und -einrichtungen

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 (Sammelband oder 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

Proceedings of SPIE, Volume 7060, Current Developments in Lens Design and Optical Engineering IX (Optical Engineering + Applications, San Diego, CA, USA; August 10-14, 2008)

2008

DOI: 10.1117/12.794196

F: Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen F: Maschinenbau und Mechatronik I: Hochschulleitung und -einrichtungen

Magnetorheological finishing is a computer-controlled polishing technique that is used mainly in the field of high-quality optical lens production. The process is based on the use of a magnetorheological polishing fluid that is able, in a reversible manner, to change its viscosity from a liquid state to a solid state under the control of a magnetic field. This outstanding characteristic facilitates rapid control (in milliseconds) of the yield stress, and thus the pressure applied to the workpiece surface to be polished. A three-axis dynamometer was used to measure the forces acting between the magnetorheological fluid and the workpiece surface during determination of the material removal characteristic of the polishing tool (influence function). The results of a testing series using a QED Q22-X MRF polishing machine with a 50 mm wheel assembly show that the normal forces range from about 2 to 20 N. Knowledge of the forces is essential, especially when thin workpieces are to be polished and distortion becomes significant. This paper discusses, and gives examples of, the variation in the parameters experienced during a programme of experiments, and provides examples of the value of this work.

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

Current Developments in Lens Design and Optical Engineering IX, vol. 7060, no. August

2008

DOI: 10.1117/12.794583