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| Titel |
Locating a small change in a multiple scattering environment (LOCADIF) |
| VerfasserIn |
Eric Larose, Nicolas Tremblay, Thomas Planes, Vincent Rossetto, Ludovic Margerin |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250033942
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| Zusammenfassung |
| This article presents an imaging technique to locate a weak perturbation in a multiple
scattering environment. We derive a formula to predict the spatio-temporal decorrelation of
diffuse coda waves induced by an extra-scatterer. Locating this new defect is then formulated
as an inverse problem which is solved by a maximum likelihood approach. Using elastic
waves in the 100-350 KHz frequency band, we show that the position of a millimetric hole
drilled in a heterogeneous concrete sample can be retrieved with a precision of a few cm. We
illustrate the robustness of the method and define an optimal time of propagation that depends
on the geometry of the acquisition and the diffusion constant of the medium. Potential
application to seismic coda waves includes volcano monitoring and eruption prediction. |
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