Mr. Torsten Baumbach Profile

Torsten Baumbach

at BIAS

SPIE Involvement:

Author

Publications (9)

Proceedings Article | 7 March 2006 Paper

Combined 3D-shape and deformation analysis of small objects using coherent optical techniques on the basis of digital holography

Soenke Seebacher, Torsten Baumbach, Wolfgang Osten, Werner Jueptner

Proceedings Volume 4101, (2006) https://doi.org/10.1117/12.498407

KEYWORDS: Digital holography, Holographic interferometry, Holography, Shape analysis, Holograms, Interferometry, Charge-coupled devices, Data modeling, Reconstruction algorithms, Digital recording

Read Abstract +

Proceedings Article | 10 September 2004 Paper

Optical characterization of liquid-crystal-on-silicon displays

Klaus-Peter Proll, Christian Kohler, Torsten Baumbach, Wolfgang Osten, Stefan Osten, Hartmut Gruber, Andreas Langner, Gunther Wernicke

Proceedings Volume 5457, (2004) https://doi.org/10.1117/12.554769

KEYWORDS: Liquid crystal on silicon, Phase shifts, Phase shift keying, Transmittance, LCDs, Holography, Amplitude modulation, Liquid crystals, Polarizers, Binary data

Read Abstract +

Proceedings Article | 10 September 2004 Paper

Application of comparative digital holography for distant shape control

Torsten Baumbach, Wolfgang Osten, Christoph von Kopylow, Werner Juptner

Proceedings Volume 5457, (2004) https://doi.org/10.1117/12.554757

KEYWORDS: Digital holography, Holograms, Holography, Wavefronts, Spatial light modulators, Calibration, Liquid crystal on silicon, Spherical lenses, Optical testing, Networks

Read Abstract +

Proceedings Article | 2 August 2004 Paper

Setup calibration and optimization for comparative digital holography

Torsten Baumbach, Wolfgang Osten, Volker Kebbel, Christoph von Kopylow, Werner Jueptner

Proceedings Volume 5532, (2004) https://doi.org/10.1117/12.563323

KEYWORDS: Wavefronts, Holograms, Digital holography, Spatial light modulators, Calibration, Phase shifts, 3D image reconstruction, Holography, Interferometry, LCDs

Read Abstract +

With increasing globalization many enterprises decide to produce the components of their products at different locations all over the world. Consequently, new technologies and strategies for quality control are required. In this context the remote comparison of objects with regard to their shape or response on certain loads is getting more and more important for a variety of applications. For such a task the novel method of comparative digital holography is a suitable tool with interferometric sensitivity. With this technique the comparison in shape or deformation of two objects does not require the presence of both objects at the same place. In contrast to the well known incoherent techniques based on inverse fringe projection this new approach uses a coherent mask for the illumination of the sample object. The coherent mask is created by digital holography to enable the instant access to the complete optical information of the master object at any wanted place. The reconstruction of the mask is done by a spatial light modulator (SLM). The transmission of the digital master hologram to the place of comparison can be done via digital telecommunication networks. Contrary to other interferometric techniques this method enables the comparison of objects with different microstructure. In continuation of earlier reports our investigations are focused here on the analysis of the constraints of the setup with respect to the quality of the hologram reconstruction with a spatial light modulator. For successful measurements the selection of the appropriate reconstruction method and the adequate optical set-up is mandatory. In addition, the use of a SLM for the reconstruction requires the knowledge of its properties for the accomplishment of this method. The investigation results for the display properties such as display curvature, phase shift and the consequences for the technique will be presented. The optimization and the calibration of the set-up and its components lead to improved results in comparative digital holography with respect to the resolution. Examples of measurements before and after the optimization and calibration will be presented.

Proceedings Article | 29 July 2002 Paper

Progress with the implementation of a shearography system for the testing of technical components

Wolfgang Osten, Torsten Baumbach, Claas Falldorf, Michael Kalms, Werner Jueptner

Proceedings Volume 4900, (2002) https://doi.org/10.1117/12.484540

KEYWORDS: Shearography, Inspection, Speckle, Light sources, Sensors, Nondestructive evaluation, Charge-coupled devices, Image sensors, Decision support systems, Infrared radiation

Read Abstract +

Proceedings Article | 19 June 2002 Paper

Remote interferometry by digital holography for shape control

Torsten Baumbach, Wolfgang Osten, Claas Falldorf, Werner Jueptner

Proceedings Volume 4778, (2002) https://doi.org/10.1117/12.473553

KEYWORDS: Digital holography, Holograms, LCDs, Holography, Wavefronts, Modulators, Interferometry, CCD cameras, 3D image reconstruction, Inspection

Read Abstract +

Modern production requires more and more effective methods for the inspection and quality control at the production place. Outsourcing and globalization result in possible large distances between co-operating partners. This may cause serious problems with respect to the just-in-time exchange of information and the response to possible violations of quality standards. Consequently new challenges arise for optical measurement techniques especially in the field of industrial shape control. A possible solution for these problems can be delivered by a technique that stores optically the full 3D information of the objects to be compared and where the data can be transported over large distances. In this paper we describe the progress in implementing a new technique for the direct comparison of the shape and deformation of two objects with different microstructure where it is not necessary that both samples are located at the same place. This is done by creating a coherent mask for the illumination of the sample object. The coherent mask is created by Digital Holography to enable the instant access to the complete optical information of the master object at any wanted place. The transmission of the digital master holograms to this place can be done via digital telecommunication networks. The comparison can be done in a digital or analogue way. Both methods result in a disappearance of the object shape and the appearance of the shape or deformation difference between the two objects only. The analogue reconstruction of the holograms with a liquid crystal spatial light modulator can be done by using the light modulator as an intensity modulator or as an phase modulator. The reconstruction technique and the space bandwidth of the light modulator will influence the quality of the result. Therefore the paper describes the progress in applying modern spatial light modulators and digital cameras for the effective storage and optical reconstruction of coherent masks.

Proceedings Article | 30 October 2001 Paper

New sensor for remote interferometry

Wolfgang Osten, Torsten Baumbach, Werner Jueptner

Proceedings Volume 4596, (2001) https://doi.org/10.1117/12.447338

KEYWORDS: Digital holography, Holography, Holograms, Wavefronts, 3D image reconstruction, Holographic interferometry, Interferometry, Sensors, Inspection, Internet

Read Abstract +

Proceedings Article | 5 June 2001 Paper

Absolute shape control of microcomponents using digital holography and multiwavelength contouring

Wolfgang Osten, Soenke Seebacher, Torsten Baumbach, Werner Jueptner

Proceedings Volume 4275, (2001) https://doi.org/10.1117/12.429350

KEYWORDS: Digital holography, Holograms, Demodulation, Interferometry, Sensors, 3D image reconstruction, Holography, Resistors, Calibration, Inspection

Read Abstract +

Proceedings Article | 15 September 1999 Paper

Qualification of optical measurement techniques for the investigation of material parameters of microcomponents

Wolfgang Osten, Werner Jueptner, Soenke Seebacher, Torsten Baumbach

Proceedings Volume 3825, (1999) https://doi.org/10.1117/12.364297

KEYWORDS: Digital holography, Speckle, Holography, Holograms, Holographic interferometry, Sensors, Fringe analysis, Silicon, Inspection, Nondestructive evaluation

Read Abstract +

Showing 5 of 9 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years