Abstract
The problem of speckle motion and decorrelation due to displacement and/or deformation of diffusely reflecting surfaces has been investigated theoretically by many authors and various approaches have been adopted. In this paper, the relation between two approaches is discussed. It is shown that the condition of stationarity of the path differences can be derived from the cross-correlation function of speckle intensities before and after the deformation. The relationship for speckle displacements is derived. Examples of experimental verification are presented.
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