Contribution à l'étude de la pression de radiation acoustique : application à la non linéarité de l'élasticité de cisaillement des solides mous

Abstract : This work presents a study of the acoustic radiation pressure induced by the propagation of an ultrasonic wave. The aim is to analyse the conditions of existence of a quasi-static pressure induced by the nonlinear propagation of a tone burst radiated in an unconfined liquid (water). Using a plane wave analysis, we interpret the quasi-static component of the self-demodulated displacement as the time average of the particle displacement. In the near-field area, a quasi-static pressure adds to the self-demodulated historically introduced. This term is formally identified as the Rayleigh radiation pressure, usually introduced in the case of a harmonic wave emitted in a confined fluid. Thus, this radiation pressure exists in a free liquid and can be interpreted as a "near-field" effect. In the far field, the Langevin radiation pressure is retrieved.
In a soft solid (tissue), the radiation pressure is used to create a local shear wave. The very low shear wave speed (a few m/s) and the associated shear elastic Mach number allow us to observe cubic nonlinear effects induced by the propagation of shear waves. These effects are measured using the ultra-fast imaging technique developed in the laboratory for medical applications (elastography).
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Submitted on : Tuesday, July 15, 2008 - 2:40:17 PM
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Mathieu Rénier. Contribution à l'étude de la pression de radiation acoustique : application à la non linéarité de l'élasticité de cisaillement des solides mous. Acoustique [physics.class-ph]. Université Paris-Diderot - Paris VII, 2008. Français. ⟨tel-00297132⟩

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