Digital phase-shifting shearography for slope measurement

Y. M. He; Cho Jui Tay; Huai Min Shang

doi:10.1117/1.602211

1 September 1999 Digital phase-shifting shearography for slope measurement

Y. M. He, Cho Jui Tay, Huai Min Shang

Optical Engineering, Vol. 38, Issue 9, (September 1999). https://doi.org/10.1117/1.602211

An electronic speckle shearing interferometry method for the full field measurement of the slope of an object is presented. The object under study is placed on a rotating platform and illuminated by an expanded laser beam. Its image is recorded by a shearing CCD camera and stored directly into a computer. By recording two images before and after giving the object a small angle of rotation, the resulting correlation fringe pattern that represents the object surface slope can be obtained. The theory of the new method and some experimental results are presented.

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Y. M. He, Cho Jui Tay, and Huai Min Shang "Digital phase-shifting shearography for slope measurement," Optical Engineering 38(9), (1 September 1999). https://doi.org/10.1117/1.602211

Published: 1 September 1999

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