Volume 47, Number 2, July II 1999
|Page(s)||175 - 181|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||01 September 2002|
Dynamic time reversal of randomly backscattered acoustic waves
Laboratoire Ondes et Acoustique, UMR 7587, Université Paris VII Denis Diderot Ecole Supérieure de Physique et de Chimie Industrielles de la Ville de Paris 10 Rue Vauquelin, 75005 Paris, France
Accepted: 12 May 1999
We report the first experiments using the reversibility of a transient acoustic wave in a multiple-scattering medium to simulate either a stationary or a dynamic acoustic lens. The method is based on time reversal experiments performed in a backscattering configuration. In the stationary case, we show that we take advantage of multiple scattering to focus better than with a perfect reflecting interface. In the dynamic case, we explain the refocused spot time evolution by a simple model based on the time-dependent ability to recover the angular spectrum thanks to both single- and multiple-scattering paths.
PACS: 43.20.Fn – Scattering of acoustic waves / 43.20.El – Reflection, refraction, diffraction of acoustic waves
© EDP Sciences, 1999
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