title: Imaging multiple local changes in heterogeneous media with diffuse waves.
abstract: This study focuses on imaging local changes in heterogeneous media. The method employed is demonstrated and validated using numerical experiments of acoustic wave propagation in a multiple scattering medium. Changes are simulated by adding new scatterers of different sizes at various positions in the medium, and the induced decorrelation of the diffuse (coda) waveforms is measured for different pairs of sensors. The spatial and temporal dependences of the decorrelation are modeled through a diffuse sensitivity kernel, based on the intensity transport in the medium. The inverse problem is then solved with a linear least square algorithm, which leads to a map of scattering cross section density of the changes.
authors.affiliation: ISTerre Université de Grenoble 1 and CNRS, 38041 Grenoble, France.
authors.forename: Thomas
authors.initials: T
authors.lastname: Planès
authors.affiliation: ISTerre Université de Grenoble 1 and CNRS, 38041 Grenoble, France.
authors.forename: Eric
authors.initials: E
authors.lastname: Larose
authors.affiliation: Université de Grenoble 1, LPMMC/CNRS, 25 avenue des Martyrs, 38042 Grenoble, France.
authors.forename: Vincent
authors.initials: V
authors.lastname: Rossetto
authors.affiliation: Université de Toulouse, IRAP/CNRS, 31400 Toulouse, France.
authors.forename: Ludovic
authors.initials: L
authors.lastname: Margerin