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Proceedings Paper

Improvement on phase-shifting method precision and application on shadow moire method
Author(s): Gerard Mauvoisin; Fabrice J. Bremand; Alexis Lagarde
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Paper Abstract

Phase shifting technique is more and more employed in photomechanic even on optical methods which are not well adapted for it, particularly for shadow moiré method where the phase shift is realized by translating the object. In such case, good results are obtained only if translation is executed with high accuracy. We present the effect of unaccuracy phase shift evaluation on the form and amplitude of calculated phase error. In this article, we propose a new automated procedure based on the use of a 2.D. F.F.T. algorithm to determine precisely the phase shift value introduced by a coarse object translation. We finally present an application on the out-of-plane displacement measurement on bended plate in corrugated paper. An order of largeness is given for await precision on such measurement.

Paper Details

Date Published: 1 December 1991
Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); doi: 10.1117/12.57488
Show Author Affiliations
Gerard Mauvoisin, Univ. de Poitiers (France)
Fabrice J. Bremand, Univ. de Poitiers (France)
Alexis Lagarde, Univ. de Poitiers (France)

Published in SPIE Proceedings Vol. 1554:
Second International Conference on Photomechanics and Speckle Metrology
Fu-Pen Chiang; Fu-Pen Chiang, Editor(s)

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