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

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