Velocity dependence of image speckles produced by a moving diffuser under dynamic speckle illumination

Abstract The velocity dependence has been investigated experimentally for the image speckles produced by a moving diffuse object under illumination of a dynamic speckle pattern. The boiling motion of the illuminating speckle pattern has little influence on the resultant speckle intensity fluctuations at the image plane if it is detected through a lens having a large pupil. In this case, the time-correlation length of speckle intensity fluctuations is inversely proportional to the object velocity. For the case where a translating speckle pattern illuminates the diffuser, its motion strongly affects the autocorrelation function of resultant speckle intensity fluctuations. The relationship between the pupil size of the imaging lens and the temporal behavior of image speckles is also considered.

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