Precision phase measurement in digital speckle shearing interferometry

Y. Shu; Fook Siong Chau; Siew-Lok Toh

doi:10.1117/12.269791

20 March 1997 Precision phase measurement in digital speckle shearing interferometry

Y. Shu, Fook Siong Chau, Siew-Lok Toh

Proceedings Volume 2921, International Conference on Experimental Mechanics: Advances and Applications; (1997) https://doi.org/10.1117/12.269791
Event: International Conference on Experimental Mechanics: Advances and Applications, 1996, Singapore, Singapore

Abstract

The measurement of phase in Digital Shearing Speckle Interferometry (DSSI) is a challenging problem because of the inherently noisy nature of shearing speckle interferograms. Accurate phase measurement depends on having a high-precision imaging system, a finely-controlled phase-shifting technique and good algorithms. In this paper, two selected algorithms used for carrying out phase measurement in ESPI (Electronic Speckle Pattern Interferometry) are applied to phase measurement in DSSI. The components and requirements of the high-precision imaging system developed to improve the recording quality of shearing interferograms are discussed. A new precisely-controlled phase shifting method developed to reduce systematic measurement error is also described. Experimental results are presented to illustrate the method.

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Y. Shu, Fook Siong Chau, and Siew-Lok Toh "Precision phase measurement in digital speckle shearing interferometry", Proc. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications, (20 March 1997); https://doi.org/10.1117/12.269791

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KEYWORDS

Phase measurement

Imaging systems

Phase shifts

Speckle

CCD cameras

Frame grabbers

Ferroelectric materials

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