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Languages: French
Types: Article
Subjects: Milieux denses, Diffusion multiple, Spectre d'extinction, Impulsions laser femtoseconde, Distribution en taille, High scattering media, Multiple scattering, Extinction spectrum, Femtosecond laser pulses, Particle size distribution, 621
Les milieux diffusants optiquement épais sont présents dans de nombreux champs d'application (nuages, peintures, sprays ou encore les milieux biologiques). Le développement de nouvelles technologies permettant de réaliser un diagnostic in situ sans perturbations est essentiel. L'objectif de ce travail de thèse est de décrire une méthode innovante pour déterminer la distribution en taille de particules diffusantes constituant un milieu épais. L'idée consiste à réaliser une mesure de spectre d'extinction associée à un algorithme d'inversion. D'un point de vue expérimental, cette mesure n'est possible qu'avec une source laser suffisamment brillante et accordable. De plus, la contribution diffusée qui perturbe la mesure doit être filtrée. Nous démontrons que les méthodes de spectroscopie femtoseconde offrent la possibilité de surmonter toutes ces difficultés. Scattering media with very high optical density are present in a great variety of application fields: clouds, paints, spray and biological cells. Development of new optical diagnosis tools is very important in order to get in situ characterization without perturbation of the sample. The goal of this work is to describe a new method to determine the Particle Size Distribution of a very thick scattering medium. This method is based on optical depth measurements for different wavelengths, and a numerical inversion algorithm. The experimental challenge is to operate a light source bright enough and tuneable in order to carry out such measurements. Furthermore, the scattered light has to be filtered. We demonstrate that femtosecond spectroscopy overcome all this difficulties.
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