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