Nicolas Riviere Thesis

French Thesis

University of Rouen

 

in

PHYSICS, MATHEMATICS AND INFORMATION FOR ENGINEERS

 

Speciality

PHYSICS

 

from

 

Nicolas RIVIERE

 

title

CONTRIBUTION OF POLARIZATION TO THE STUDY

OF LOW-DENSITY OR OPTICALLY THICK SCATTERING MEDIA

  

8th September 2006
jury
Dominique Baillis, Xavier Briottet, Giovannini Hugues,

Gérard Gréhan, Laurent Hespel et Gérard Jeandel

 

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Abstract

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).

 

Laboratories and Researh Institutes

Optronics Department (Département Optique et Techniques Associées - DOTA)

2 avenue Edouard Belin - BP 74025 - 31055 Toulouse cedex 4 - France

Téléphone : +33 (0)5 62 25 26 24

E.mail : riviere.@.onera.fr

 

COmplexe de Recherche Interprofessionnel en Aérothermochimie - CORIA

Electromagnétisme, Optique, Optoélectronique

CNRS UMR 6614 - Université de Rouen

Site universitaire du Madrillet - BP 12 - 76801 Saint Etienne du Rouvray cedex - France