The parametric propagation in underwater acoustics : experimental results

E. Bouttard (1) , V. Labat (1) , Olivier Bou Matar (2) , Thierry Chonavel (3, 4)

1 IRENAV - Institut de Recherche de l'Ecole Navale
2 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
3 SC - Département Signal et Communications
4 Lab-STICC_TB_CID_TOMS

In underwater acoustics, detection of buried objects in sediments (cables, mines, . . . ) is a complex problem. Indeed, in order to ensure su cient 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.

Domaines: Acoustique [physics.class-ph]; Acoustique [physics.class-ph]

E. Bouttard, V. Labat, Olivier Bou Matar, Thierry Chonavel. The parametric propagation in underwater acoustics : experimental results. Acoustics 2012, Apr 2012, Nantes, France. paper 000735, 43-47. ⟨hal-00801091⟩