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 (GF), as well as stable background noise sources, is necessary. In order to further develop this monitoring technique, a laboratory experiment was performed in the 2.5 MHz 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 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.
Stability of monitoring weak changes in multiply scattering media with ambient noise correlation: laboratory experiments.
C. Hadziioannou,É. Larose,O. Coutant,P. Roux,M. Campillo
Published 2009 in Journal of the Acoustical Society of America
ABSTRACT
PUBLICATION RECORD
- Publication year
2009
- Venue
Journal of the Acoustical Society of America
- Publication date
2009-04-22
- Fields of study
Medicine, Physics, Engineering
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
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