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Théorie et simulation de la conjugaison de phase magnéto-acoustique

Abstract : This thesis presents the analytical solutions for the acoustic wave phase conjugation in an active medium in one dimension. In this work, the conjugator is in direct contact with arbitrary passive media but the active zone can be limited inside the conjugator.

The theory presented in this thesis is based on a straightforward analysis using a dual time-scale method and provides very practical results like the threshold of the supercritical modes, the rate of amplification, and its link with the stress repartition in the conjugator.

The duality property of the conjugator in even and odd solutions clarifies the theoretical reason for the experiment problem where we have a modulation depth higher than the threshold but there isn't an exponential amplification.

The focalization problem is described schematically through a transposition of 1D result to spherical symmetry conjugator. All the analytical solutions are compared with the numerical simulations. Finally the problem of multidimensional phase conjugation is initiated by 2D numerical simulation.
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https://tel.archives-ouvertes.fr/tel-00343775
Contributor : Qi Zhang <>
Submitted on : Tuesday, December 2, 2008 - 5:32:40 PM
Last modification on : Tuesday, November 24, 2020 - 2:18:04 PM
Long-term archiving on: : Monday, June 7, 2010 - 9:04:48 PM

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  • HAL Id : tel-00343775, version 1

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Qi Zhang. Théorie et simulation de la conjugaison de phase magnéto-acoustique. Acoustique [physics.class-ph]. Université des Sciences et Technologie de Lille - Lille I, 2008. Français. ⟨tel-00343775⟩

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