The time-averaging effect on fringes produced from a specklegram under time-varying speckle illumination, by which undesirable speckle noise is successfully reduced, is studied. In this method, a specklegram is illuminated by laser speckles emerging from a vibrating multimode optical fiber. The characteristics of time-averaged fringes are revealed theoretically and experimentally by taking into consideration the deformation of speckles recorded on the specklegram and the correlation area of speckles from the multimode optical fiber.
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Takai et al. (1986) studied this question.
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