Passive identification of acoustic propagation media with viscous damping

Mikael Carmona (1) , Olivier J.J. Michel (2) , Jean-Louis Lacoume (3) , Barbara Nicolas (3) , Nathalie Sprinsky (1)

1 CEA-LETI - Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information
2 GIPSA-CICS - GIPSA - Communication Information and Complex Systems
3 GIPSA-SIGMAPHY - GIPSA - Signal Images Physique

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.

Domaines: Traitement du signal et de l'image [eess.SP]; Traitement du signal et de l'image [eess.SP]

Mikael Carmona, Olivier J.J. Michel, Jean-Louis Lacoume, Barbara Nicolas, Nathalie Sprinsky. Passive identification of acoustic propagation media with viscous damping. EUSIPCO 2011 - 19th European Signal Processing Conference, Aug 2011, Barcelone, Spain. pp.#1569425187 session SPA-P1. ⟨hal-00642223⟩