Relation between the contrast in time integrated dynamic speckle patterns and the power spectral density of their temporal intensity fluctuations

M.J. Draijer, E. Hondebrink, M. Larsson, T.G. van Leeuwen

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Abstract

Scattering fluid flux can be quantified with coherent light, either from the contrast of speckle patterns, or from the moments of the power spectrum of intensity fluctuations. We present a theory connecting these approaches for the general case of mixed static-dynamic patterns of boiling speckles without prior assumptions regarding the particle dynamics. An expression is derived and tested relating the speckle contrast to the intensity power spectrum. Our theory demonstrates that in speckle contrast the concentration of moving particles dominates over the contribution of speed to the particle flux. Our theory provides a basis for comparison of both approaches when used for studying tissue perfusion. © 2010 Optical Society of America.
Original languageEnglish
Pages (from-to)21883-21891
JournalOptics Express
Volume18
Issue number21
DOIs
Publication statusPublished - 2010

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