Speckle Primary Approximation Theory In Scattering Media Transmission And The Localized Correction Of Coherent Backscatter

The light wave propagation in scattering media is a complex process, it can be absorbed will be scattered, both for the ability of absorption and scattering of different media is not the same. The absorption coefficient and scattering coefficient as two important parameters that can quantitatively describe some basic characteristics of the scattering medium.In this paper, we study the laser speckle properties after body scattering medium transmission, in order to acquire the scattering medium carrying part feature information.In order to simplify the analysis of the speckle, from light scattering medium diffusion equation, using series solution of transmission photonic density of primary approximation, gives a description of speckle contrast degree and scattering medium, scattering coefficient and absorption coefficient of the propagation distance. Considering the coherence length of the same order of magnitude scale and scattering medium, there are factors of backscatter that photon diffusion, diffusion coefficients of D as the weak localization correction.Respectively by white Acrylite sheets and white plastic as the scattering medium,experimental measurement of speckle contrast changes with the propagation distance, and the results of theoretical analysis for further comparison, thus confirming the approximate theory proposed by this paper is feasible. This work further enrich the research of speckle and scattering of dielectric properties.