Caractérisation de Milieux diffusants en écoulement par transport incohérent de lumière polarisée

Abstract : In this thesis, we are interested in the general problem of characterizing concentrated dispersions. We develop an optical diffusing method which uses the incoherent polarized light transport. We propose an experimental setup to acquire the Mueller matrix (Matrix 4x4 2D). This matrix, composed by 16 images, represents all interactions between an electromagnetic wave and a diffusing medium. The experimental device is composed of a focused laser diode and a CCD camera to acquire the backscattered images. Four liquid crystal retarders are used to select quickly the appropriate polarization states of light that enter and leave the medium. To analyse polarisation effects, we develop a Monte Carlo simulation database using Mie theory. We show that knowing refractive indexes, Mueller matrices can be used to determine simultaneously and in situ an average particle size and particle volume fraction in dense turbid media. The measurement method is validated with oil in water emulsions and is used to study dynamically a complex coacervation mechanism. In the second part of the thesis, the anisotropic light transport is used to study the birefringence of turbid media or anisotropic suspensions. We measure dynamically the shear-induced global orientation in a clay suspension, a glass cylinders suspension and red blood cells suspensions. So, the static incoherent polarized light transport is a powerful method to characterize under flow various turbid medium in terms of particle size, concentration and objects orientation.
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Jérôme Dillet. Caractérisation de Milieux diffusants en écoulement par transport incohérent de lumière polarisée. Autre. Université Henri Poincaré - Nancy 1, 2007. Français. ⟨NNT : 2007NAN10003⟩. ⟨tel-01754264⟩

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