1 June 1982 Laser Speckle Photography As A Practical Alternative To Holographic Interferometry For Measuring Plate Deformation
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Abstract
Although holographic interferometry is in theory capable of measuring the three-dimensional deformation of a strained body, in practice its most frequent use lies in the evaluation of the warping and twisting of a surface, for which only unidirectional viewing through a small sized hologram is required. The alternative technique of defocused speckle photography gives values of local surface tilting, from which the change in shape of its profile along any direction in the surface can be obtained by integration. An experiment per-formed to compare the two techniques showed that with careful adjustment of the focus condition, speckle photography is capable of measuring the out-of-plane displacement with an absolute accuracy approaching that of holographic interferometry.
A. E. Ennos, A. E. Ennos, M. S. Virdee, M. S. Virdee, } "Laser Speckle Photography As A Practical Alternative To Holographic Interferometry For Measuring Plate Deformation," Optical Engineering 21(3), 213478 (1 June 1982). https://doi.org/10.1117/12.7972933 . Submission:
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