Passive identification of acoustic propagation media with viscous damping
Résumé
This paper concerns passive identification of an acous- tic propagation medium with viscous damping. We propose a Green correlation approach to retrieve time of arrival be- tween two sensors and to retrieve also times of arrival of first echoes. Green correlation is introduced as the cross- correlation of acoustic field generated by a white noise ex- citing the medium. This approach is experimentally vali- dated and compared to the classical method which consists in retrieving the Green function from the Green correlation through a Ward identity. We show that this latter approach appears to be numerically inaccurate and above all unneces- sary in the acoustic case with viscous damping.
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