Field fluctuation spectroscopy in a reverberant cavity with moving scatterers.
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.
de Rosny
Julien
J
Laboratoire Ondes et Acoustique, ESPCI, Université Paris VII, U.M.R. 7587 C.N.R.S., 10 rue Vauquelin, 75005 Paris, France.
Roux
Philippe
P
Fink
Mathias
M
Page
J H
JH