Shear measurement in digital speckle shearing interferometry using digital correlation

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Accurate computations of surface slope deformation based on digital speckle shearing interferometry fringe patterns require a precise measure of the amount of shear introduced. A previous method of employing image processing, while providing accurate and fast measurements, is limited by the need to place a tape target on the object surface. In this paper, a novel method employing digital correlation is demonstrated to obviate this requirement while maintaining accurate mensurations of shear. It also allows automated measurement procedures to be readily incorporated.

Original languageEnglish
Pages (from-to)241-244
Number of pages4
JournalOptics Communications
Issue number3-4
Publication statusPublished - 15 Mar 1995
Externally publishedYes

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