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Imagerie interférométrique en défaut de mise au point pour des mesures de particules discrètes en volume et la reconnaissance de forme de particules irrégulières

Abstract : Submerged structures such as tidal turbines generate turbulent flows that can strongly disrupt the seabed. Understanding the impact of the presence of these structures requires understanding the three-dimensional dynamics of the vortices they generate. Optical methods, by their non-intrusive aspect, make it possible to analyze these dynamics. Interferometric Particle Imaging is a technique originally developed for the measurement of transparent spherical particles such as droplets orbubbles. We offer here an extension of this technique for the simultaneous characterization of irregular and spherical particles in a flow. A first experimental set-up has confirmed the validity of the method for the size and three-dimensional position measurement of grains of sand and air bubbles in water. A second device was used on a wave flume of bigger dimensions, introducing the notions of three-dimensional tracking of irregular particles and the analysis of the variation of their orientation.A third device made of two Interferometric Particle Imaging set-ups at two angles of observation is described for the shape recognition of different families of irregular particles. Through comparisons with simulations, dimensions and orientations of these particles are determined. This kind of device should be suitable for the characterization of ice crystals for which various shapes are known. The prospects that such results provide include the extension of the technique to the particle velocitymeasurement in hostile conditions, combined with the shape recognition and the determination of rotation of particles.
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https://tel.archives-ouvertes.fr/tel-01691306
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Submitted on : Tuesday, January 23, 2018 - 6:19:09 PM
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  • HAL Id : tel-01691306, version 1

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Lila Ouldarbi. Imagerie interférométrique en défaut de mise au point pour des mesures de particules discrètes en volume et la reconnaissance de forme de particules irrégulières. Optique [physics.optics]. Normandie Université, 2017. Français. ⟨NNT : 2017NORMR050⟩. ⟨tel-01691306⟩

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