Asynchronous direct demodulation of spatiotemporal fringe patterns

Juan Antonio Quiroga Mellado; Jose Antonio Gomez-Pedrero; Daniel Crespo

doi:10.1117/12.613768

14 February 2005 Asynchronous direct demodulation of spatiotemporal fringe patterns

Juan Antonio Quiroga Mellado, Jose Antonio Gomez-Pedrero, Daniel Crespo

Proceedings Volume 5776, Eighth International Symposium on Laser Metrology; (2005) https://doi.org/10.1117/12.613768
Event: Eighth International Conference on Laser Metrology, 2005, Merida, Mexico

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.

Citation Download Citation

Juan Antonio Quiroga Mellado, Jose Antonio Gomez-Pedrero, and Daniel Crespo "Asynchronous direct demodulation of spatiotemporal fringe patterns", Proc. SPIE 5776, Eighth International Symposium on Laser Metrology, (14 February 2005); https://doi.org/10.1117/12.613768

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