Proceedings PaperVelocity dependence of doubly scattered speckles produced by a cascade of two moving diffusers
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Dynamic speckles always appear when a coherent light illuminates dense scattering media in motion. These media usually produce multiply-scattered speckles whose statistical properties are considered to be different from those of singly-scattered norial speckles. Several theoretical studies13 have been carried out for doubly- or multiplyscattered speckles. However, most of these analyses deal with speckles in the far field or image speckles in focus, and few studies have been conducted on the effect of defocus on the dynamic properties of doubly-scattered speckles. In the present paper we investigate the dynamic properties of time-varying speckles formed in an imaging system by the light passing through a sequential pair of two moving diffusers. The space-time correlation function for the Image speckle patterns is derived to estisate the influence of the motion of each diffuser on a fluctuating speed of the speckle intensity. Several interesting features have been deduced.