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Optical Engineering

Shearography: A New Optical Method For Strain Measurement And Nondestructive Testing
Author(s): Y. Y. Hung
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Paper Abstract

This paper presents a new optical method referred to as shearography. Shearography is an interferometric method which employs an image-shearing camera. It permits full-field measurement of derivatives of surface displacements. The object under study is illuminated by laser light, and it is imaged by an image-shearing camera. The image-shearing camera produces two laterally sheared images in the image plane. When a photographic film in the image plane is doubly exposed with the object being deformed between the exposures, the processed photograph yields a fringe pattern which depicts the surface displacement gradients. Theory of the method as well as its applications to strain meausrements and nondestructive testing are presented.

Paper Details

Date Published: 1 June 1982
PDF: 5 pages
Opt. Eng. 21(3) 213391 doi: 10.1117/12.7972920
Published in: Optical Engineering Volume 21, Issue 3
Show Author Affiliations
Y. Y. Hung, Oakland University (United States)


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