University of Rouen
PHYSICS, MATHEMATICS AND INFORMATION FOR ENGINEERS
CONTRIBUTION OF POLARIZATION TO THE STUDY
OF LOW-DENSITY OR OPTICALLY THICK SCATTERING MEDIA
8th September 2006
Dominique Baillis, Xavier Briottet, Giovannini Hugues,
Gérard Gréhan, Laurent Hespel et Gérard Jeandel
To learn more about the thesis...
Contribution of polarization to the study of low-density or optically thick scattering media
Predicting the radiative properties of diluted scattering media and determining the BRDF-BTDF for dense scattering media require a good estimation of microphysical parameters such as particle size distribution. Polarized light scattering bears information that can favor the characterization of these media. Our study aims to introduce polarized data into the optimization scheme to find the optical thickness, the albedo, and the Mueller matrix. Direct 1D codes (adding-doubling) and 3D codes (Monte Carlo) have been developed to solve the polarized radiative transfer equation (VRTE). After a study of sensitivity, we adopt the inversion strategy. The optical thickness, albedo and others parameters which describe the Mueller matrix are identified recursively and coupled by optimization methods. The particle size distribution is then extracted from the Mueller matrix. After numerical validation of this concept, an experimental validation is conducted on reference media, using a specifically developed system (MELOPEE bench).
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