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Identification of radiative parameters of dense scattering media with polarization analysis

DOI: 10.1615/ICHMT.2007.ConfElectromagLigScat.470
pages 177-180

Nicolas Riviere
Onera, The French Aerospace Lab, Theoretical and Applied Optics Department Light Interaction with Matter, Imaging and Detection Laser Systems Unit, 2 avenue Edouard Belin, BP4025, 31055 Toulouse cedex 4, France

Laurent Hespel
Onera, The French Aerospace Lab, Theoretical and Applied Optics Department Light Interaction with Matter, Imaging and Detection Laser Systems Unit, 2 avenue Edouard Belin, BP4025, 31055 Toulouse cedex 4, France

Аннотация

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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