Locating a small change in a multiple scattering environment

Larose, Eric; Planes, Thomas; Rossetto, Vincent; Margerin, Ludovic
May 2010
Applied Physics Letters;5/17/2010, Vol. 96 Issue 20, p204101
Academic Journal
This article presents an imaging technique to locate a weak perturbation in a multiple scattering environment. We derive a formula to predict the spatiotemporal decorrelation of diffuse coda waves induced by an extra scatterer. Locating this new defect is formulated as an inverse problem which is solved by a maximum likelihood approach. Using elastic waves in the 50–400 kHz frequency band, we recover the position of a millimetric hole drilled in a concrete sample with a precision of a few centimeter. Note that the size of the defect is comparable to the size of the myriads of heterogeneities constituting the sample.


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