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The parametric propagation in underwater acoustics : experimental results

Communication avec acte
Author
BOUTTARD, Etienne
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
LABAT, Valérie
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
BOU MATAR, Olivier
1296 Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
CHONAVEL, Thierry
98040 Département Signal et Communications [SC]

URI
http://hdl.handle.net/10985/8988
Date
2012

Abstract

In underwater acoustics, detection of buried objects in sediments (cables, mines, . . . ) is a complex problem. Indeed, in order to ensure sufficient penetration depth in marine sediments, low frequencies have to be used, implying a low resolution. A solution proposed to solve this problem is the parametric emission based on the nonlinear properties of seawater. This method can generate a low frequency wave from two directional high frequencies beams. The aim of this work is to present experimental results of a parametric propagation. Experiments have been carried out in a water tank in various configurations. These experimental measurements are then compared with simulation results obtained with a numerical model based on a fractional-step method presented at the Underwater Acoustic Measurements conference in 2011.

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