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Multiple-image shearography: a direct method to determine curvatures.

作者信息

Tay C J, Toh S L, Shang H M, Lin Q Y

出版信息

Appl Opt. 1995 May 1;34(13):2202-6. doi: 10.1364/AO.34.002202.

DOI:10.1364/AO.34.002202
PMID:21037767
Abstract

We present a modified method of shearography, known herein as multiple-image shearography, whereby the curvatures of an object can be measured directly from the resulting fringes. It employs an image-shearing camera that produces three sheared images simultaneously to interfere with each other in the image plane. When film is doubly exposed before and after an object is deformed, three sets of fringes are observed of which one set would depict the second-order derivatives of surface displacement.The theory of the multiple-image shearography technique and its application to curvature measurements in plate bending are presented.

摘要

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