Average speckle size is an important statistical parameter representing the lateral profile feature of laser speckle, which has an impact on the measurement of in-plane displacement of scattering object. In this experiment, a measurement system of in-plane displacement through scattering object has been setup. By varying propagation distance and scattering surface diameter, laser speckles are collected by CCD camera and autocorrelated to obtain the estimation values of average speckle size, and then the in-plane displacements are measured by digital image correlation method. Afterward, the influence of average speckle size on in-plane displacement measurement is discussed, and the result shows that the larger the average speckle size is, the greater the measurement error is, and the smaller the measurement limit is, which has a certain reference value for practical applications in the displacement and deformation measurement of objects.
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Yang et al. (2024) studied this question.
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