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Article Dans Une Revue Journal of the Acoustical Society of America Année : 2009

Stability of Monitoring Weak Changes in Multiply Scattering Media with Ambient Noise Correlation: Laboratory Experiments.

Résumé

Previous studies have shown that small changes can be monitored in a scattering medium by observing phase shifts in the coda. Passive monitoring of weak changes through ambient noise correlation has already been applied to seismology, acoustics and engineering. Usually, this is done under the assumption that a properly reconstructed Green function as well as stable background noise sources are necessary. In order to further develop this monitoring technique, a laboratory experiment was performed in the 2.5MHz range in a gel with scattering inclusions, comparing an active (pulse-echo) form of monitoring to a passive (correlation) one. Present results show that temperature changes in the medium can be observed even if the Green function (GF) of the medium is not reconstructed. Moreover, this article establishes that the GF reconstruction in the correlations is not a necessary condition: the only condition to monitoring with correlation (passive experiment) is the relative stability of the background noise structure.
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Dates et versions

hal-00377456 , version 1 (21-04-2009)

Identifiants

Citer

Céline Hadziioannou, Éric Larose, Olivier Coutant, Philippe Roux, Michel Campillo. Stability of Monitoring Weak Changes in Multiply Scattering Media with Ambient Noise Correlation: Laboratory Experiments.. Journal of the Acoustical Society of America, 2009, 125 (6), pp.3688-3695. ⟨hal-00377456⟩
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