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Ultrasons rayonnés par une source laser ponctuelle dans des milieux isotropes transverses et applications à la mesure du tenseur d'élasticité de cylindres et de couches minces

Abstract : The subject of this thesis is the study of the radiation of ultrasounds generated by laser sources focalised along a line or a point in transverse isotropic samples. The geometries considered are one-layer or double-layer planes, or cylindrical. The application to the stiffness tensor measurement is also described. A classical laser ultrasonic setup, using a YAG laser and an interferometric probe allow studying the response of cylinders of millimetric diameter to several laser/material interactions. A picosecond acoustic setup is also used in order to investigate the acoustic waves diffraction in micrometric films. Experimental signals were confronted to results obtained by numerical models. The influence of the optical reflections on the interfaces is also analyzed. The formulation of the directivity functions in anisotropic media for bulk sources and the study of the corresponding directivity diagrams give qualitative informations which are necessary to interpret the signals.
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https://tel.archives-ouvertes.fr/tel-00179548
Contributor : Mathieu Perton <>
Submitted on : Monday, October 15, 2007 - 11:01:24 PM
Last modification on : Thursday, January 11, 2018 - 6:21:23 AM
Long-term archiving on: : Monday, September 24, 2012 - 1:30:39 PM

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  • HAL Id : tel-00179548, version 1

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Mathieu Perton. Ultrasons rayonnés par une source laser ponctuelle dans des milieux isotropes transverses et applications à la mesure du tenseur d'élasticité de cylindres et de couches minces. Acoustique [physics.class-ph]. Université Sciences et Technologies - Bordeaux I, 2006. Français. ⟨tel-00179548⟩

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