Electronic shearography (ESPSI) for direct measurement of strains

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Abstract
Holographic interferometry is an optical method for measuring displacement. However, it is the first or second derivative of displacement in many cases that is of interest, rather than the displacement information. Shearography which has developed in the last twelve years permits full-field, noncontacting measurement of the first derivative of displacement, and, therefore, it is rapidly gaining acceptance by the industry. This paper presents the recent development of shearography in technique and in theory. A few applications are shown in this paper.

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