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Optimal sampling and range of measurement in displacement-only laser-speckle correlation

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Abstract

A statistical analysis of the subjective laser-speckle pattern is performed with emphasis on its spectral distribution. An optimal sampling resolution of the laser-speckle pattern is obtained using the Shannon sampling theorem. Experiments show that the displacement-only correlation using laser speckles is a reliable measurement as long as the sampling requirement is satisfied. Upper limits of measurement such as accuracy, measurable area and measurable deformation are discussed. A method of changing the measurement capabilities by adjusting the speckle-recording arrangement is also given.

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Authors and Affiliations

  1. Department of Mechanical Engineering, State University of New York, 11794-2300, Stony Brook, NY

    D. J. Chen (Graduate Research Assistant) & F. P. Chiang (Leading Professor)

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  1. D. J. Chen
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  2. F. P. Chiang
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Chen, D.J., Chiang, F.P. Optimal sampling and range of measurement in displacement-only laser-speckle correlation. Experimental Mechanics 32, 145–153 (1992). https://doi.org/10.1007/BF02324726

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  • DOI: https://doi.org/10.1007/BF02324726

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