Optical fiber digital speckle pattern correlation method for displacement measurement

Rongxun Liu; Xinwei Liu

doi:10.1117/12.211889

14 June 1995 Optical fiber digital speckle pattern correlation method for displacement measurement

Rongxun Liu, Xinwei Liu

Proceedings Volume 2544, Interferometry VII: Techniques and Analysis; (1995) https://doi.org/10.1117/12.211889
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

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.

Citation Download Citation

Rongxun Liu and Xinwei Liu "Optical fiber digital speckle pattern correlation method for displacement measurement", Proc. SPIE 2544, Interferometry VII: Techniques and Analysis, (14 June 1995); https://doi.org/10.1117/12.211889

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KEYWORDS

Speckle pattern

Speckle

Optical fibers

Digital image correlation

Digital imaging

CCD cameras

Image processing

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