Volume 76, Number 3, November 2006
|Page(s)||422 - 428|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||22 September 2006|
Coherent backscattering of ultrasound without a source
Department of Theoretical and Applied Mechanics, University of Illinois Urbana, IL 61801, USA
Corresponding author: firstname.lastname@example.org
Accepted: 5 September 2006
Coherent backscattering is due to constructive interferences of reciprocal paths and leads to an enhancement of the intensity of a multiply scattered field near its source. To observe this enhancement an array of receivers is conventionally placed close to the source. Our approach here is different. In a first experiment, we recover the coherent backscattering effect (CBE) within an array of sources and a distant receiver using time correlation of diffuse fields. The enhancement cone has an excellent spatial resolution. The dynamics of the enhancement factor is studied in a second experiment using correlation of thermal phonons at the same ultrasonic frequencies, without any active source.
PACS: 43.20.+g – General linear acoustics / 43.35.+d – Ultrasonics, quantum acoustics, and physical effects of sound / 43.40.+s – Structural acoustics and vibration
© EDP Sciences, 2006
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