title: Sensitivity to perturbations of a time-reversed acoustic wave in a multiple scattering medium.
abstract: We present experimental results on the robustness of acoustic time-reversal focusing in a multiple scattering medium undergoing perturbations. Time reversal in such a medium can be viewed as a correlation technique, analogous to diffusive wave spectroscopy. Moreover, the recent introduction of telecommunication techniques based on time reversal in changeable media naturally raises the question of sensitivity to a perturbation of the medium. We consider the situation where the reversibility of an acoustic wave generated by a linelike source is gradually destroyed when a perturbation is added, either locally (by removing scatterers) or globally (by changing the temperature) to the multiple scattering medium.
authors.affiliation: Laboratoire Ondes et Acoustique, UMR 7587, Université Paris VII Denis Diderot, Ecole Supérieure de Physique et de Chimie Industrielles de la Ville de Paris, 10 Rue Vauquelin, 75005 Paris, France.
authors.forename: A
authors.initials: A
authors.lastname: Tourin
authors.forename: A
authors.initials: A
authors.lastname: Derode
authors.forename: M
authors.initials: M
authors.lastname: Fink