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Proceedings Paper

Phase demodulation from a single fringes pattern: Application to DSPI fringes
Author(s): Eric Robin; Valéry Valle; Fabrice Bremand
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Paper Abstract

The aim of this paper concerns the phase demodulation of a fringes pattern in dynamic regime. During a dynamic loading, we can not use a phase shifting technique because the mechanical parameters involve according to the time. This problem can be avoided with the development of algorithms which can extract the information with the help of only one fringes pattern. In this way, we present two algorithms, the MPC [1] (Modulated Phase Correlation) and the pMPC [2] (polynomial Modulated Phase Correlation). These algorithms allow us to extract the phase from a single fringes pattern obtained, for example, by shadow moire, photoelasticity or interferometry. These processes are based on the use of the virtual fringes pattern which locally approaches the real fringes morphology. The similarity degree between real and virtual fringes pattern is estimated by digital correlation technique. When the best similarity is obtained, we suppose that the virtual phase function is very near of the real phase function. One particularity of these algorithms is theirs few sensitivity to noises. So, we propose to use the MPC or the pMPC algorithms in order to extract the relief in dynamic from a single interferogram obtained by digital speckle pattern interferometry. In this paper we present an experimental test of impact loading on textile specimen. The frame rate is equal to 6000 frames per second. The figure 1 shows one of the fringes patterns recorded in dynamic and the result of wrapped phase demodulated with one of ours algorithms.

Paper Details

Date Published: 15 September 2006
PDF: 6 pages
Proc. SPIE 6341, Speckle06: Speckles, From Grains to Flowers, 63410N (15 September 2006); doi: 10.1117/12.695293
Show Author Affiliations
Eric Robin, Lab. de Mécanique des Solides, SP2MI (France)
Valéry Valle, Lab. de Mécanique des Solides, SP2MI (France)
Fabrice Bremand, Lab. de Mécanique des Solides, SP2MI (France)

Published in SPIE Proceedings Vol. 6341:
Speckle06: Speckles, From Grains to Flowers
Pierre Slangen; Christine Cerruti, Editor(s)

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