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Proceedings Paper

Evaluation of ESPI phase images with regional discontinuities
Author(s): Detlef Winter; Dirk Bergmann; Bernd W. Luehrig; Reinhold Ritter
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Paper Abstract

A universal strategy for evaluation of ESPI (Electronic Speckle Pattern Interferometer)-phase images is proposed. Starting points of the strategy are the phase-shifted sets of the speckle- pattern of two object states. Special algorithms for calculating the modulo 2(pi) phase-image (so called `saw-tooth-image') and filtering to reduce the speckle noise and mask out areas of bad intensity modulation and of local discontinuities are described. A new area based algorithm works automatically. Regional discontinuities in the saw-tooth-images don't cause errors in the results of the true phase data. All of the proposed algorithms are implemented and tested in the hardware independent (UNIX, C, X-Windows, OSF-MOTIV) program system PISA.

Paper Details

Date Published: 10 December 1993
PDF: 11 pages
Proc. SPIE 2003, Interferometry VI: Techniques and Analysis, (10 December 1993); doi: 10.1117/12.165465
Show Author Affiliations
Detlef Winter, Technische Univ. Braunschweig (Germany)
Dirk Bergmann, Technische Univ. Braunschweig (Germany)
Bernd W. Luehrig, Technische Univ. Braunschweig (Germany)
Reinhold Ritter, Technische Univ. Braunschweig (Germany)

Published in SPIE Proceedings Vol. 2003:
Interferometry VI: Techniques and Analysis
Osuk Y. Kwon; Gordon M. Brown; Malgorzata Kujawinska, Editor(s)

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