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Proceedings Paper

Asynchronous direct demodulation of spatiotemporal fringe patterns
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Paper Abstract

In this work, we present a method for the asynchronous direct demodulation of spatiotemporal fringe patterns by the estimation of the quadrature sign (sign of the fringe pattern quadrature signal) from one of the irradiance gradient components. The technique is based in the normalization of one plane of a spatio-temporal fringe pattern, an arcos demodulation and a final sign correction by means of the estimated quadrature sign. We present two experimental applications of the direct demodulation method presented. The first application is the measurement of surface topography by RGB Shadow-Moire. The second application is isochromatics retardation measurement by load stepping photoelasticity. In both cases good results are obtained confirming the suitability of the presented technique.

Paper Details

Date Published: 14 February 2005
PDF: 8 pages
Proc. SPIE 5776, Eighth International Symposium on Laser Metrology, (14 February 2005); doi: 10.1117/12.613768
Show Author Affiliations
Juan Antonio Quiroga Mellado, Univ. Complutense de Madrid (Spain)
Jose Antonio Gomez-Pedrero, Univ. Complutense de Madrid (Spain)
Daniel Crespo, Univ. Complutense de Madrid (Spain)


Published in SPIE Proceedings Vol. 5776:
Eighth International Symposium on Laser Metrology

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