title: Field fluctuation spectroscopy in a reverberant cavity with moving scatterers.
abstract: We report a study of transient ultrasonic waves inside a reverberant cavity containing moving scatterers. We show that the elastic mean free path and the dynamics of the scatterers govern the evolution of the autocorrelation of acoustic wave field. A parallel is established between these results and a closely related technique, diffusing acoustic wave spectroscopy. Excellent agreement is found between experiment and theory for a moving stainless steel ball in a water tank, thereby elucidating the underlying physics, and a potential application, fish monitoring inside aquariums, is demonstrated.
authors.affiliation: Laboratoire Ondes et Acoustique, ESPCI, Université Paris VII, U.M.R. 7587 C.N.R.S., 10 rue Vauquelin, 75005 Paris, France.
authors.forename: Julien
authors.initials: J
authors.lastname: de Rosny
authors.forename: Philippe
authors.initials: P
authors.lastname: Roux
authors.forename: Mathias
authors.initials: M
authors.lastname: Fink
authors.forename: J H
authors.initials: JH
authors.lastname: Page