A numerical model for dynamic speckle and its application to the analysis of temporally evolving processes

RABAL, H.; TRIVI, M.; ARIZAGA, R.; FEDERICO, A.; GALIZZI, G. E.; KAUFMANN, G. H.

Nimes, Francia

Congreso; Speckle 06; 2006

Ecole des Mines d’ Ales, Francia

When the speckle pattern produced by a scattering surface shows some type of activity, the speckle distribution changes in time. This paper presents a method to locally estimate the spatial variance of the temporal variation of the phase as an activity descriptor in a sequence of dynamic speckle. This method is based on the computation of the spatial autocorrelation of the speckle intensity using a sliding window. The image obtained from the resulting spatial variance matrix reveals areas of the sample with different speckle activity. Results obtained for both simulated and experimental data are also shown.