Relation between time reversal focusing and coherent backscattering in multiple scattering media: A diagrammatic approachReportar como inadecuado




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1 LOA - Laboratoire ondes et acoustique 2 LPMMC - Laboratoire de physique et modélisation des milieux condensés

Abstract : In this paper, we revisit one-channel time reversal TR experiments through multiple scattering media in the framework of the multiple scattering theory. The hyperresolution and the self-averaging property are retrieved. The developed formalism leads to a deeper understanding of the role of the ladder and most-crossed diagrams in a TR experiment and also establishes the link between TR and coherent backscattering CBS. Especially, we show that when the initial source and the time reversal point are at the same location, the time-reversed amplitude is twice higher. Surprisingly, this enhancement is due to the ladder diagrams and not to the most-crossed ones, contrary to CBS. These theoretical predictions are confirmed by experimental results. The experiments are performed with ultrasonic waves propagating through a random collection of parallel steel rods.

Keywords : acoustics time-reversal diffusion mesoscopic reciprocity multiple scattering





Autor: Julien De Rosny - Arnaud Tourin - Arnaud Derode - Bart Van Tiggelen - Mathias Fink -

Fuente: https://hal.archives-ouvertes.fr/



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