title: Experimental measurement of the acoustic sensitivity kernel.
abstract: In the Born approximation, the acoustic scattering from a spherical obstacle of a size comparable to the acoustic wavelength can be evaluated in the framework of the sensitivity kernel approach, which describes the relationship between the pressure-field fluctuation and the position of a local change in the propagation medium. The spatial structure of the sensitivity kernel is here investigated through experimental observations made in a water tank at the ultrasonic scale and compared to an analytical model. The pattern of the sensitivity kernel is discussed in the case of a source-to-receiver wave field that includes a direct path and one surface reflection.
authors.affiliation: Institut des Sciences de la Terre, Université Joseph Fourier and Centre National de la Recherche Scientifique (CNRS), Grenoble, France. philippe.roux@obs.ujf-grenoble.fr
authors.forename: Philippe
authors.initials: P
authors.lastname: Roux
authors.forename: Christian
authors.initials: C
authors.lastname: Marandet
authors.forename: Barbara
authors.initials: B
authors.lastname: Nicolas
authors.forename: W A
authors.initials: WA
authors.lastname: Kuperman