14 June 1995 Optical fiber digital speckle pattern correlation method for displacement measurement
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This paper briefly reviews present situation on optical fiber-speckle method used for measuring displacements or deformations of an object, and the optical fiber-digital white light speckle patterns correlation method for whole field displacement measurement on a remote surface of a trial object is revealed. The principle of correlation method is demonstrated. A special program for image correlation analysis by computer C language, according to the fundamental principle of digital speckle patterns correlation searching and reading/writing mode of MS4213 image board has been written. The set-up was that a coherent multimode fiber bundle (MBE) was used to transmit white light speckles on a test surface onto a target of CCD camera, then, using microcomputer, monitor system, the displacements on the surface have been obtained. Two experiments which were used to measure displacements of a rigid rotational disk around its axis and deflections of a beam in three-point bending had been made. The experimental results agree well with theory. We came to a conclusion that under the circumstances of a large displacement/deformation, the method contributed in this study has an obvious advantage in measuring a whole field displacement/deformation of a remote object or an interior of nontransparent structure.
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Rongxun Liu, Rongxun Liu, Xinwei Liu, Xinwei Liu, } "Optical fiber digital speckle pattern correlation method for displacement measurement", Proc. SPIE 2544, Interferometry VII: Techniques and Analysis, (14 June 1995); doi: 10.1117/12.211889; https://doi.org/10.1117/12.211889

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