Zeitschriftenartikel
- Peter Sperber
- Katrin Juds
- Stefan Schuster
- Ariane Hartmann
- Diana Schramm
In: Zeitschrift für die gesamte Wertschöpfungskette Automobilwirtschaft (ZfAW)
- 2015
- Angewandte Informatik
- MOBIL
Vortrag
- Peter Sperber
- 2011
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
In: soleg Partnertreffen Photovoltaik
- 2011
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
In: 19. C.A.R.M.E.N.-Symposium "Unendlich statt unwägbar- Erneuerbare Energien für die Zukunft"
- 2011
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
- 2011
- Hochschulleitung und -einrichtungen
Zeitschriftenartikel
- Christian Vogt
- S. Sinzinger
- H. Adelsberger
- Roland Maurer
- Florian Schneider
- R. Mandler
- L. Kuepper
- Rolf Rascher
- Peter Sperber
In: Advanced Materials Research
DOI: 10.4028/www.scientific.net/AMR.325.91
- Hochschulleitung und -einrichtungen
- Maschinenbau und Mechatronik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Vortrag
- Peter Sperber
In: soleg Partnertreffen Photovoltaik
- 2011
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
In: Jahrestreffen der Botschafter Niederbayerns
- 2011
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Roland Maurer
- Florian Schneider
- Christian Vogt
- Markus Schinhärl
- Peter Sperber
- Rolf Rascher
- 2011
DOI: 10.1117/12.889491
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
Vortrag
- Peter Sperber
In: Aktiventreffen VCD Bayern
- 2011
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
In: Kommunaler Tag Elektromobilität
- 2011
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
In: Sitzung Umwelt- und Energieauschuss des Landkreises Straubing-Bogen
- 2011
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
In: HTI FORUM „Energieströme verbinden – aber wie?“
- 2011
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
In: 15. Projekttreffen „EvB“
- 2011
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
- 2011
- Hochschulleitung und -einrichtungen
Vortrag
- Christian Schopf
- Peter Sperber
- Rolf Rascher
In: Achtes Symposium - Zukunft Glas - von der Tradition zum High-Tech-Produkt
- 2010
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Hochschulleitung und -einrichtungen
Vortrag
- Florian Schneider
- Christian Vogt
- Roland Maurer
- Rolf Rascher
- Peter Sperber
In: SPIE Conference
- 2010
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
Beitrag (Sammelband oder Tagungsband)
- Markus Schinhärl
- Christian Vogt
- Florian Schneider
- Peter Sperber
- Rolf Rascher
- 2010
- Maschinenbau und Mechatronik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Markus Schinhärl
- Florian Schneider
- Rolf Rascher
- Christian Vogt
- Peter Sperber
- 2010
DOI: 10.1117/12.865508
Magnetorheological finishing is a typical commercial application of a computer-controlled polishing process in the manufacturing of precision optical surfaces. Precise knowledge of the material removal characteristic of the polishing tool (influence function) is essential for controlling the material removal on the workpiece surface by the dwell time method. Results from the testing series with magnetorheological finishing have shown that a deviation of only 5% between the actual material removal characteristic of the polishing tool and that represented by the influence function caused a considerable reduction in the polishing quality. The paper discusses reasons for inaccuracies in the influence function and the effects on the polishing quality. The generic results of this research serve for the development of improved polishing strategies, and may be used in alternative applications of computer-controlled polishing processes that quantify the material removal characteristic by influence functions.
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
Vortrag
- Peter Sperber
In: Runder Tisch Wirtschaft
- 2010
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Christian Schopf
- Rolf Rascher
- Peter Sperber
- 2010
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Christian Vogt
- Markus Schinhärl
- Florian Schneider
- Peter Sperber
- Rolf Rascher
In: International Optical Design Conference 2010 (13-17 June 2010, Jackson Hole, WY, USA). null (Proceedings of SPIE. 2004-)
- 2010
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
In: Lokale Agenda 21 - Landkreis Regen
- 2010
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Igor Makarenko
- Christian Vogt
- Rolf Rascher
- Peter Sperber
- Thomas Stirner
- 2010
- Maschinenbau und Mechatronik
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Vortrag
- Christian Schopf
- Rolf Rascher
- Peter Sperber
In: Achtes Symposium - Zukunft Glas - von der Tradition zum High-Tech-Produkt
- 2010
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Beitrag (Sammelband oder Tagungsband)
- Florian Schneider
- Markus Schinhärl
- Christian Vogt
- Roland Maurer
- Peter Sperber
- Rolf Rascher
- R. Stamp
- G. Smith
- 2010
- Maschinenbau und Mechatronik
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Vortrag
- Peter Sperber
In: Glasforum Bayerischer Wald
- 2010
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
- T. Donaubauer
- A. Zacherl
In: IFAT Entsorga
- 2010
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
- 2010
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
In: 1st International Workshop on Novel Developments and Applications in Sensor Technology
- 2009
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
In: BAYHOST - Donauforum
- 2009
- Hochschulleitung und -einrichtungen
Vortrag
- Christian Vogt
- R. Stamp
- G. Smith
- Rolf Rascher
- Peter Sperber
- Florian Schneider
- Roland Maurer
- Markus Schinhärl
In: SPIE Optifab
- 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.
- Maschinenbau und Mechatronik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Hochschulleitung und -einrichtungen
Zeitschriftenartikel
- Markus Schinhärl
- G. Smith
- R. Stamp
- Rolf Rascher
- L. Smith
- Elmar Pitschke
- Peter Sperber
- Andreas Geiss
In: Applied Mathematical Modelling
- 2008
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.
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Hochschulleitung und -einrichtungen
- Elektrotechnik und Medientechnik
- Maschinenbau und Mechatronik
Beitrag (Sammelband oder Tagungsband)
- Andreas Geiss
- K. Fathima
- J. Slabeycius
- L. Hajduchova
- Rolf Rascher
- Peter Sperber
- Markus Schinhärl
- 2008
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Hochschulleitung und -einrichtungen
- Maschinenbau und Mechatronik
Vortrag
- Rolf Rascher
- Peter Sperber
In: BayTech Optik Seminar
- 2008
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Hochschulleitung und -einrichtungen
Vortrag
- Christian Schopf
- K. Fathima
- Andreas Geiss
- Markus Schinhärl
- Christian Vogt
- Rolf Rascher
- Peter Sperber
In: Siebtes Symposium - Zukunft Glas - von der Tradition zum High-Tech-Produkt
- 2008
- Maschinenbau und Mechatronik
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Zeitschriftenartikel
- Markus Schinhärl
- G. Smith
- R. Stamp
- Rolf Rascher
- L. Smith
- Elmar Pitschke
- Peter Sperber
- Andreas Geiss
In: Applied Mathematical Modelling
- 2008
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.
- Hochschulleitung und -einrichtungen
- Maschinenbau und Mechatronik
- Elektrotechnik und Medientechnik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Beitrag (Sammelband oder Tagungsband)
- Andreas Geiss
- J. Slabeycius
- Rolf Rascher
- Markus Schinhärl
- Peter Sperber
- K. Fathima
- 2008
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
Beitrag (Sammelband oder Tagungsband)
- Christian Schopf
- K. Fathima
- Andreas Geiss
- Markus Schinhärl
- Christian Vogt
- Rolf Rascher
- Peter Sperber
- 2008
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
- Hochschulleitung und -einrichtungen
Zeitschriftenartikel
- Andreas Geiss
- Rolf Rascher
- J. Slabeycius
- Markus Schinhärl
- Peter Sperber
- K. Fathima
In: Current Developments in Lens Design and Optical Engineering IX
- 2008
DOI: 10.1117/12.794583
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.
- Maschinenbau und Mechatronik
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Beitrag (Sammelband oder Tagungsband)
- K. Fathima
- Christian Schopf
- Andreas Geiss
- Markus Schinhärl
- Christian Vogt
- Rolf Rascher
- Peter Sperber
- 2008
- Hochschulleitung und -einrichtungen
- Maschinenbau und Mechatronik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Zeitschriftenartikel
- Markus Schinhärl
- R. Stamp
- Elmar Pitschke
- Rolf Rascher
- L. Smith
- G. Smith
- Andreas Geiss
- Peter Sperber
In: Current Developments in Lens Design and Optical Engineering IX
- 2008
DOI: 10.1117/12.808036
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.
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Elektrotechnik und Medientechnik
- Maschinenbau und Mechatronik
Vortrag
- K. Fathima
- Christian Schopf
- Andreas Geiss
- Markus Schinhärl
- Christian Vogt
- Rolf Rascher
- Peter Sperber
In: Siebtes Symposium - Zukunft Glas - von der Tradition zum High-Tech-Produkt
- 2008
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
Beitrag (Sammelband oder Tagungsband)
- Markus Schinhärl
- Christian Vogt
- Andreas Geiss
- R. Stamp
- Peter Sperber
- L. Smith
- G. Smith
- Rolf Rascher
- 2008
DOI: 10.1117/12.794196
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.
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
Vortrag
- Peter Sperber
In: Kongress für Personalmarketing - Mitarbeiter finden, führen und behalten
- 2008
- Hochschulleitung und -einrichtungen
Zeitschriftenartikel
- Elmar Pitschke
- Markus Schinhärl
- Rolf Rascher
- Peter Sperber
- L. Smith
- R. Stamp
- M. Smith
In: Robotics and Computer-Integrated Manufacturing
- 2008
DOI: 10.1016/j.rcim.2006.07.003
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.
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Elektrotechnik und Medientechnik
- Maschinenbau und Mechatronik
Zeitschriftenartikel
- Markus Schinhärl
- Rolf Rascher
- R. Stamp
- L. Smith
- G. Smith
- Peter Sperber
- Elmar Pitschke
In: Precision Engineering
- 2008
DOI: 10.1016/j.precisioneng.2007.04.005
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.
- Maschinenbau und Mechatronik
- Elektrotechnik und Medientechnik
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Beitrag (Sammelband oder Tagungsband)
- Andreas Geiss
- Markus Schinhärl
- Rolf Rascher
- Peter Sperber
- J. Slabeycius
- K. Fathima
- Christian Vogt
- 2008
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Josef Kölbl
- M. Fröschl
- A. Seedsman
- Peter Sperber
- 2008
DOI: 10.1117/12.800132
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.
- Hochschulleitung und -einrichtungen
- Elektrotechnik und Medientechnik
Vortrag
- Andreas Geiss
- Markus Schinhärl
- Elmar Pitschke
- Rolf Rascher
- Peter Sperber
- K. Fathima
- J. Slabeycius
In: The 12th International Conference on Problems of Material Engineering, Mechanics and Design
- 2007
- Hochschulleitung und -einrichtungen
- Maschinenbau und Mechatronik
- Elektrotechnik und Medientechnik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Vortrag
- Peter Sperber
- 2007
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- K. Fathima
- Andreas Geiss
- Rolf Rascher
- Peter Sperber
- Markus Schinhärl
- Elmar Pitschke
- 2007
- Maschinenbau und Mechatronik
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Elektrotechnik und Medientechnik
Vortrag
- Peter Sperber
In: GGOS Working Group at the General Assembly of the European Geosciences Union
- 2007
- Hochschulleitung und -einrichtungen
Zeitschriftenartikel
- Markus Schinhärl
- Rolf Rascher
- R. Stamp
- G. Smith
- L. Smith
- Elmar Pitschke
- Peter Sperber
In: International Journal of Machine Tools and Manufacture
- 2007
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.
- Elektrotechnik und Medientechnik
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
Beitrag (Sammelband oder Tagungsband)
- Andreas Geiss
- Markus Schinhärl
- Elmar Pitschke
- K. Fathima
- Rolf Rascher
- Peter Sperber
- J. Slabeycius
- 2007
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
- Hochschulleitung und -einrichtungen
- Elektrotechnik und Medientechnik
Zeitschriftenartikel
- Markus Schinhärl
- G. Smith
- Andreas Geiss
- L. Smith
- Rolf Rascher
- Peter Sperber
- Elmar Pitschke
- R. Stamp
In: Optical Manufacturing and Testing VII
- 2007
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.
- Elektrotechnik und Medientechnik
- Maschinenbau und Mechatronik
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Zeitschriftenartikel
- Thomas Bartscher
- Wolfgang Dorner
- Peter Sperber
- Reinhard Höpfl
In: Die neue Hochschule (DNH)
- 2007
- Hochschulleitung und -einrichtungen
- Institut für Existenzgründung
- Elektrotechnik und Medientechnik
- DIGITAL
Vortrag
- Markus Schinhärl
- G. Smith
- Andreas Geiss
- L. Smith
- Rolf Rascher
- Peter Sperber
- Elmar Pitschke
- R. Stamp
In: Optical Manufacturing and Testing VII, SPIE
- 2007
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
- Elektrotechnik und Medientechnik
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Andreas Geiss
- Markus Schinhärl
- Elmar Pitschke
- Rolf Rascher
- Peter Sperber
- K. Fathima
- J. Slabeycius
- 2007
- Hochschulleitung und -einrichtungen
- Maschinenbau und Mechatronik
- Elektrotechnik und Medientechnik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Zeitschriftenartikel
- Elmar Pitschke
- Peter Sperber
- Rolf Rascher
- R. Stamp
- M. Smith
- L. Smith
- Markus Schinhärl
In: Optical Manufacturing and Testing VII
- 2007
DOI: 10.1117/12.761356
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.
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Elektrotechnik und Medientechnik
- Maschinenbau und Mechatronik
Zeitschriftenartikel
- Elmar Pitschke
- Markus Schinhärl
- Rolf Rascher
- Peter Sperber
- L. Smith
- R. Stamp
- M. Smith
In: Robotics and Computer-Integrated Manufacturing
DOI: 10.1016/j.rcim.2006.07.003
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.
- Elektrotechnik und Medientechnik
- Maschinenbau und Mechatronik
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Beitrag (Sammelband oder Tagungsband)
- R. Brunswick
- B. Cook
- G. Pentland
- Peter Sperber
- 2006
- Hochschulleitung und -einrichtungen
Zeitschriftenartikel
- Andreas Geiss
- Markus Schinhärl
- Elmar Pitschke
- Rolf Rascher
- Peter Sperber
- J. Slabeycius
In: Current Developments in Lens Design and Optical Engineering VII
- 2006
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.
- Hochschulleitung und -einrichtungen
- Maschinenbau und Mechatronik
- Elektrotechnik und Medientechnik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Zeitschriftenartikel
- Markus Schinhärl
- Andreas Geiss
- Rolf Rascher
- Peter Sperber
- R. Stamp
- L. Smith
- G. Smith
- Elmar Pitschke
In: Current Developments in Lens Design and Optical Engineering VII
- 2006
DOI: 10.1117/12.678720
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.
- Hochschulleitung und -einrichtungen
- Elektrotechnik und Medientechnik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
Vortrag
- Andreas Geiss
- Markus Schinhärl
- Elmar Pitschke
- Rolf Rascher
- Peter Sperber
- J. Slabeycius
In: Current Developments in Lens Design and Optical Engineering VII
- 2006
- Maschinenbau und Mechatronik
- Elektrotechnik und Medientechnik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Andreas Geiss
- Markus Schinhärl
- Elmar Pitschke
- Rolf Rascher
- Peter Sperber
- 2006
- Elektrotechnik und Medientechnik
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
Vortrag
- Markus Schinhärl
- Andreas Geiss
- Rolf Rascher
- Peter Sperber
- R. Stamp
- L. Smith
- G. Smith
- Elmar Pitschke
In: Current Developments in Lens Design and Optical Engineering VII
- 2006
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Elektrotechnik und Medientechnik
- Maschinenbau und Mechatronik
Vortrag
- Rolf Rascher
- Peter Sperber
In: BayTech Optik Seminar
- 2006
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Beitrag (Sammelband oder Tagungsband)
- Andreas Geiss
- Markus Schinhärl
- Elmar Pitschke
- Rolf Rascher
- Peter Sperber
- J. Slabeycius
- 2006
- Elektrotechnik und Medientechnik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
- Hochschulleitung und -einrichtungen
Vortrag
- Andreas Geiss
- Markus Schinhärl
- Elmar Pitschke
- Rolf Rascher
- Peter Sperber
- J. Slabeycius
In: 5th Youth Symposium on Experimental Solid Mechanics
- 2006
- Hochschulleitung und -einrichtungen
- Elektrotechnik und Medientechnik
- Maschinenbau und Mechatronik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Zeitschriftenartikel
- Elmar Pitschke
- Markus Schinhärl
- Peter Sperber
- Rolf Rascher
- R. Stamp
- M. Smith
- L. Smith
In: Optical Engineering
- 2006
DOI: 10.1117/1.2213630
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.
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
- Elektrotechnik und Medientechnik
Beitrag (Sammelband oder Tagungsband)
- Andreas Geiss
- Markus Schinhärl
- Elmar Pitschke
- Rolf Rascher
- Peter Sperber
- 2006
- Maschinenbau und Mechatronik
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Elektrotechnik und Medientechnik
Vortrag
- Elmar Pitschke
- Markus Schinhärl
- Peter Sperber
- Rolf Rascher
In: Optical Measurement Systems for Industrial Inspection IV
- 2005
- Hochschulleitung und -einrichtungen
- Elektrotechnik und Medientechnik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
Zeitschriftenartikel
- Markus Schinhärl
- Elmar Pitschke
- Andreas Geiss
- Rolf Rascher
- Peter Sperber
- R. Stamp
- L. Smith
- G. Smith
In: Optical Fabrication, Testing, and Metrology II
- 2005
DOI: 10.1117/12.656430
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.
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Hochschulleitung und -einrichtungen
- Maschinenbau und Mechatronik
- Elektrotechnik und Medientechnik
Vortrag
- Markus Schinhärl
- Elmar Pitschke
- Andreas Geiss
- Rolf Rascher
- Peter Sperber
- R. Stamp
- L. Smith
- G. Smith
- 2005
- Maschinenbau und Mechatronik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Hochschulleitung und -einrichtungen
- Elektrotechnik und Medientechnik
Zeitschriftenartikel
- Elmar Pitschke
- Markus Schinhärl
- Andreas Geiss
- Peter Sperber
- Rolf Rascher
- R. Stamp
- L. Smith
- M. Smith
In: Optical Manufacturing and Testing VI
- 2005
DOI: 10.1117/12.616780
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.
- Hochschulleitung und -einrichtungen
- Elektrotechnik und Medientechnik
- Maschinenbau und Mechatronik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Zeitschriftenartikel
- Andreas Geiss
- Markus Schinhärl
- Elmar Pitschke
- Rolf Rascher
- Peter Sperber
In: Optical Manufacturing and Testing VI
- 2005
DOI: 10.1117/12.616751
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.
- Maschinenbau und Mechatronik
- Hochschulleitung und -einrichtungen
- Elektrotechnik und Medientechnik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Vortrag
- Markus Schinhärl
- Elmar Pitschke
- Andreas Geiss
- Rolf Rascher
- Peter Sperber
- R. Stamp
- L. Smith
- G. Smith
In: Optical Manufacturing and Testing VI
- 2005
- Elektrotechnik und Medientechnik
- Hochschulleitung und -einrichtungen
- Maschinenbau und Mechatronik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Zeitschriftenartikel
- Markus Schinhärl
- Elmar Pitschke
- Andreas Geiss
- Rolf Rascher
- Peter Sperber
- R. Stamp
- L. Smith
- G. Smith
In: Optical Manufacturing and Testing VI
- 2005
DOI: 10.1117/12.616690
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.
- Elektrotechnik und Medientechnik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
- Elmar Pitschke
- Markus Schinhärl
- Rolf Rascher
In: BayTech Optik Seminar
- 2005
- Maschinenbau und Mechatronik
- Elektrotechnik und Medientechnik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Hochschulleitung und -einrichtungen
Vortrag
- Elmar Pitschke
- Markus Schinhärl
- Andreas Geiss
- Peter Sperber
- Rolf Rascher
- R. Stamp
- L. Smith
- M. Smith
In: Optical Manufacturing and Testing VI
- 2005
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.
- Hochschulleitung und -einrichtungen
- Maschinenbau und Mechatronik
- Elektrotechnik und Medientechnik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Vortrag
- Andreas Geiss
- Markus Schinhärl
- Elmar Pitschke
- Rolf Rascher
- Peter Sperber
In: Optical Manufacturing and Testing VI
- 2005
- Elektrotechnik und Medientechnik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Hochschulleitung und -einrichtungen
- Maschinenbau und Mechatronik
Zeitschriftenartikel
- Elmar Pitschke
- Markus Schinhärl
- Peter Sperber
- Rolf Rascher
In: Optical Measurement Systems for Industrial Inspection IV
- 2005
DOI: 10.1117/12.612597
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.
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Elektrotechnik und Medientechnik
- Maschinenbau und Mechatronik
- Hochschulleitung und -einrichtungen
Vortrag
- Elmar Pitschke
- Markus Schinhärl
- Rolf Rascher
- Peter Sperber
In: Fünftes Symposium - Zukunft Glas - Von der Tradition zum High-Tech-Produkt
- 2004
- Hochschulleitung und -einrichtungen
- Maschinenbau und Mechatronik
- Elektrotechnik und Medientechnik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Beitrag (Sammelband oder Tagungsband)
- Elmar Pitschke
- Markus Schinhärl
- Rolf Rascher
- Peter Sperber
- 2004
- Hochschulleitung und -einrichtungen
- Elektrotechnik und Medientechnik
- Maschinenbau und Mechatronik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Vortrag
- Elmar Pitschke
- Markus Schinhärl
- Peter Sperber
- Rolf Rascher
- R. Stamp
- L. Smith
- M. Smith
- A. Hammer
In: Current Developments in Lens Design and Optical Engineering V
- 2004
- Elektrotechnik und Medientechnik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Maschinenbau und Mechatronik
- Hochschulleitung und -einrichtungen
Vortrag
- Markus Schinhärl
- Elmar Pitschke
- Rolf Rascher
- Peter Sperber
- R. Stamp
- L. Smith
- G. Smith
In: Current Developments in Lens Design and Optical Engineering V
- 2004
- Elektrotechnik und Medientechnik
- Maschinenbau und Mechatronik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Hochschulleitung und -einrichtungen
Zeitschriftenartikel
- Peter Sperber
- S. Riepl
In: Geodesia I Kartographia
- 2004
- Hochschulleitung und -einrichtungen
Zeitschriftenartikel
- Markus Schinhärl
- Elmar Pitschke
- Rolf Rascher
- Peter Sperber
- R. Stamp
- L. Smith
- G. Smith
In: Current Developments in Lens Design and Optical Engineering V
- 2004
DOI: 10.1117/12.558897
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.
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Elektrotechnik und Medientechnik
- Hochschulleitung und -einrichtungen
- Maschinenbau und Mechatronik
Zeitschriftenartikel
- Elmar Pitschke
- Markus Schinhärl
- Peter Sperber
- Rolf Rascher
- R. Stamp
- L. Smith
- M. Smith
- A. Hammer
In: Current Developments in Lens Design and Optical Engineering V
- 2004
DOI: 10.1117/12.558899
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.
- Elektrotechnik und Medientechnik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Hochschulleitung und -einrichtungen
- Maschinenbau und Mechatronik
Vortrag
- Elmar Pitschke
- Peter Sperber
- Rolf Rascher
- R. Stamp
- M. Smith
- L. Smith
- Markus Schinhärl
In: Optical Manufacturing and Testing VII
- 2003
- Hochschulleitung und -einrichtungen
- Maschinenbau und Mechatronik
- Elektrotechnik und Medientechnik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Patent
- Peter Sperber
- 2003
- Hochschulleitung und -einrichtungen
Zeitschriftenartikel
- K. Hamal
- I. Prochazka
- G. Kirchner
- U. Schreiber
- R. Riepl
- Peter Sperber
- W. Gurtner
- G. Appleby
- P. Gibbis
- Y. FuMin
- R. Neubert
- L. Grunwaldt
In: Geophysical Research Abstracts
- 2003
The recent requirement of the Satellite Laser Ranging SLR technique is to reach the accuracy of a millimeter. This requires keeping all the system biases on the sub millimeter level. The Portable Calibration Standard is a global reference for Satellite Laser Ranging systems biases identification and evaluation. It consists of the Pico Event Timer P-PET, meteorological station, epoch and frequency time base, set of reference retroreflectors and the control / data processing software package. The P-PET is compact, stable and easy to re-allocate within days. Its properties are appropriate for calibration standard purposes: the timing resolution is 1.2 psec, 2.5 psec per channel timing jitter, the temporal stability is less than 0.5 psec per hour and below 0.5 psec per Kelvin. The key feature of the timing system is its long term stability: no adjustments and settings are needed. Before we could start the global SLR network calibration, we had to succeed with the calibration missions at several SLR stations in Austria, Germany, Switzerland, United Kingdom, China and Chile. This enabled us to understand the feasibility of using the Pico Event Timer P-PET. Summarizing the results: the ranging precision to ground target is 1-3 millimeters, to satellites is 3-7 millimeters rms, the Calibration Standard demonstrated its capability to identify the SLR system range and time biases at the one-millimeter level. These results might serve as a background to the proposed 6th Framework programme EU Integrated Project EUROLAS CALNet.
- Hochschulleitung und -einrichtungen
Zeitschriftenartikel
- Elmar Pitschke
- Peter Sperber
- R. Stamp
- Rolf Rascher
- L. Smith
- M. Smith
- Markus Schinhärl
In: Optical Manufacturing and Testing V
- 2003
DOI: 10.1117/12.507652
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.
- Maschinenbau und Mechatronik
- Elektrotechnik und Medientechnik
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Vortrag
- Elmar Pitschke
- Peter Sperber
- R. Stamp
- Rolf Rascher
- L. Smith
- M. Smith
- Markus Schinhärl
In: Optical Manufacturing and Testing V
- 2003
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Elektrotechnik und Medientechnik
- Hochschulleitung und -einrichtungen
- Maschinenbau und Mechatronik
Beitrag (Sammelband oder Tagungsband)
- Rolf Rascher
- Peter Sperber
- 2002
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Vortrag
- Peter Sperber
- T. Stautmeister
- Andreas Baumgartner
- Josef Kölbl
- H. Tauscher
- J. Kellner
In: 13th International Workshop on Laser Ranging
- 2002
- Elektrotechnik und Medientechnik
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
- T. Stautmeister
- Andreas Baumgartner
- Josef Kölbl
- H. Tauscher
- J. Kellner
- 2002
- Hochschulleitung und -einrichtungen
- Elektrotechnik und Medientechnik
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
- Andreas Baumgartner
- Josef Kölbl
- H. Tauscher
- J. Kellner
- 2002
- Elektrotechnik und Medientechnik
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
- S. Riepl
In: International Conference Mathematical and Physical Methods in Ecology and Environmental Monitoring
- 2001
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
- S. Riepl
- 2001
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Y. Zhao
- Peter Sperber
- T. Wang
- C. Fan
- N. Liu
- X. Han
- Ch. Liu
- 2000
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
- 2000
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
In: Drittes Symposium Zukunft Glas-Von der Tradition zum High-Tech-Produkt
- 2000
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Josef Kölbl
- Peter Sperber
- 1999
- Elektrotechnik und Medientechnik
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- H. Hase
- W. Schlüter
- A. Böer
- R. Dassing
- Peter Sperber
- R. Kilger
- 1997
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
- A. Böer
- U. Hessels
- U. Schreiber
- 1997
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- W. Schlüter
- A. Böer
- R. Dassing
- H. Hase
- R. Kilger
- H. Seeger
- Peter Sperber
- 1997
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- W. Schlüter
- A. Böer
- R. Dassing
- H. Hase
- R. Kilger
- H. Seeger
- Peter Sperber
- 1997
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- H. Hase
- A. Böer
- W. Schlüter
- R. Dassing
- Peter Sperber
- R. Kilger
- 1996
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- H. Hase
- W. Schlüter
- A. Böer
- R. Dassing
- Peter Sperber
- R. Kilger
- 1996
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
- A. Böer
- R. Dassing
- U. Hessels
- W. Schlüter
In: 10th International Workshop on Laser Ranging Instrumentation
- 1996
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
- A. Böer
- F. Estable
- F. Falcoz
- E. Pop
- L. Vigroux
- 1996
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
- A. Böer
- U. Hessels
- U. Schreiber
In: International Conference on Lasers '96
- 1996
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- W. Schlüter
- A. Böer
- R. Dassing
- H. Hase
- R. Kilger
- E. Reinhart
- B. Richter
- W. Riepl
- U. Schreiber
- H. Seeger
- Peter Sperber
In: Beiträge zum J. J. Baeyer-Symposium. null (Reihe E)
- 1996
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
- A. Böer
- R. Dassing
- U. Hessels
- W. Schlüter
- 1996
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
- W. Schlüter
- A. Böer
- R. Dassing
- H. Hase
- R. Kilger
In: 10th International Workshop on Laser Ranging Instrumentation
- 1996
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
- W. Schlüter
- A. Böer
- R. Dassing
- H. Hase
- R. Kilger
- 1996
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- H. Hase
- W. Schlüter
- A. Böer
- R. Dassing
- Peter Sperber
- R. Kilger
- 1995
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
In: Workshop on the Application of Space Techniques for Geo-Scientific Research in Russia
- 1995
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- H. Braakman
- van der Kra, M.
- H. Visser
- van der Zwa, B.
- Peter Sperber
- 1994
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
- R. Motz
- Paul Schötz
- M. Maberry
- R. Zane
In: 9th International Workshop on Laser Ranging Instrumentation
- 1994
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
In: 6th General Assembly of Wegener
- 1994
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
In: Proceedings of the 6th General Assembly of Wegener. null (NAS5-31330)
- 1994
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
- R. Motz
- Paul Schötz
- M. Maberry
- R. Zane
- 1994
- Hochschulleitung und -einrichtungen
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Vortrag
- Peter Sperber
In: 6th General Assembly of Wegener
- 1994
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- A. Ferrario
- C. Malyicini
- P. Vannutelli
- Peter Sperber
- 1994
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
- W. Schlüter
- A. Böer
- R. Dassing
- H. Hase
- R. Kilger
In: 9th International Workshop on Laser Ranging Instrumentation
- 1994
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
In: Proceedings of the 6th General Assembly of Wegener. null (NAS5-31330)
- 1994
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
- W. Schlüter
- A. Böer
- R. Dassing
- H. Hase
- R. Kilger
- 1994
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- H. Braakman
- van der Kra, M.
- H. Visser
- van der Zwa, B.
- Peter Sperber
- 1994
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- W. Schlüter
- R. Dassing
- Peter Sperber
- R. Kilger
- U. Schreiber
- 1993
- Hochschulleitung und -einrichtungen
Zeitschriftenartikel
- W. Schlüter
- R. Dassing
- Peter Sperber
- H. Seeger
- R. Kilger
- U. Schreiber
In: zfv - Zeitschrift für Geodäsie, Geoinformation und Landmanagement
- 1993
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
- U. Hessels
- R. Motz
- W. Beek
- J. Offierski
- C. van Es
- 1992
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
- L. Amberg
- L. Beyer
- G. Blenski
- W. Etling
- U. Hessels
- R. Motz
In: 8th International Workshop on Laser Ranging Instrumentation
- 1992
- Hochschulleitung und -einrichtungen
Zeitschriftenartikel
- W. Schlüter
- R. Dassing
- Peter Sperber
- R. Kilger
- U. Schreiber
In: avn - allgemeine vermessungs-nachrichten
- 1992
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
- L. Amberg
- L. Beyer
- G. Blenski
- W. Etling
- U. Hessels
- R. Motz
- 1992
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
- U. Hessels
- R. Motz
- H.-M. Güther
- 1992
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- E. Vermaat
- J. Offierski
- K. Otten
- W. Beek
- C. van Es
- Peter Sperber
- 1992
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
- U. Hessels
- R. Motz
- W. Beek
- J. Offierski
- C. van Es
In: 8th International Workshop on Laser Ranging Instrumentation
- 1992
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
- U. Hessels
- R. Motz
- H.-M. Güther
In: 8th International Workshop on Laser Ranging Instrumentation
- 1992
- Hochschulleitung und -einrichtungen
Zeitschriftenartikel
- Peter Sperber
- W. Schlüter
In: avn - allgemeine vermessungs-nachrichten
- 1992
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
- H. Hauck
In: 8th International Workshop on Laser Ranging Instrumentation
- 1992
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
- H. Hauck
- 1992
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
In: Intercosmos Laser Group Meeting
- 1990
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
- L. Amberg
- G. Blenski
- W. Etling
- U. Hessels
- R. Motz
- 1990
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
- U. Hessels
- R. Motz
- 1989
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
- P. Wilson
- 1989
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
In: 7th International Workshop on Laser Ranging Instrumentation
- 1989
- Hochschulleitung und -einrichtungen
Vortrag
- Peter Sperber
In: 7th International Workshop on Laser Ranging Instrumentation
- 1989
- Hochschulleitung und -einrichtungen
Zeitschriftenartikel
- Peter Sperber
- W. Spangler
- B. Meier
- A. Penzkofer
In: Optical and Quantum Electronics
- 1988
DOI: 10.1007/BF00632467
Picosecond pulse generation in longitudinally pumped dye laser generators and amplifiers is studied experimentally and theoretically. Frequency-tunable pulses between 720 and 940 nm are generated with a picosecond ruby laser pump source. The amplification of spontaneous emission and of seeding pulses in the generator and amplifier cells is investigated. Stimulated emission cross-sections and excited-state absorption cross-sections are determined by computer simulations. The coherence properties of the generated radiation are analysed. Resonance Raman contributions are resolved.
- Elektrotechnik und Medientechnik
- Hochschulleitung und -einrichtungen
Zeitschriftenartikel
- Peter Sperber
- M. Weidner
- A. Penzkofer
In: Applied Physics B
- 1987
- Elektrotechnik und Medientechnik
- Hochschulleitung und -einrichtungen
Beitrag (Sammelband oder Tagungsband)
- Peter Sperber
- M. Weidner
- A. Penzkofer
In: Ultrafast Phenomena V. Proceedings of the fifth OSA topical meeting (Springer Series in Chemical Physics)
- 1986
- Elektrotechnik und Medientechnik
- Hochschulleitung und -einrichtungen
Zeitschriftenartikel
- Peter Sperber
- A. Penzkofer
In: Optical and Quantum Electronics
- 1986
The intensity-dependent transmission of picosecond ruby laser pulses of different duration through methanolic and ethanolic solutions of rhodamine B and rhodamine 6G is analysed. The transmission is affected by S0-S n two-photon absorption, by stimulated emission at the pump-laser frequency, by amplified spontaneous emission and by excited-state absorption. Various parameters involving the two-photon absorption dynamics are determined by comparing experiments with numerical simulations.
- Elektrotechnik und Medientechnik
- Hochschulleitung und -einrichtungen
Zeitschriftenartikel
- A. Penzkofer
- Peter Sperber
In: Chemical Physics
- Elektrotechnik und Medientechnik
- Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
- Hochschulleitung und -einrichtungen