Shearography: A New Optical Method For Strain Measurement And Nondestructive Testing

Y. Y. Hung

doi:10.1117/12.7972920

1 June 1982 Shearography: A New Optical Method For Strain Measurement And Nondestructive Testing

Y. Y. Hung

Author Affiliations +

Optical Engineering, Vol. 21, Issue 3, 213391 (June 1982). https://doi.org/10.1117/12.7972920

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.

Citation Download Citation

Y. Y. Hung "Shearography: A New Optical Method For Strain Measurement And Nondestructive Testing," Optical Engineering 21(3), 213391 (1 June 1982). https://doi.org/10.1117/12.7972920

Published: 1 June 1982

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