title: Ultrasonic measurement of bulk and shear moduli variations in porous alumina media.
abstract: In this paper we studied some acoustical parameters of a porous medium based on the Biot's theory. The basic idea was to find, using an inversion method, variations in the bulk modulus K(b) and the shear modulus G(b) in the frequency domain. This was achieved by comparing the theoretical and experimental results obtained on a selection of porous alumina samples with different physical characteristics. Then, using the transmission coefficient, a numerical process was applied to a virtual porous alumina medium in order to find K(b) and G(b) values at low frequency under static conditions. Using a frequency range of 50kHz to 600kHz, fast and slow waves were considered and both were included in the transmission coefficient.
authors.affiliation: IEMN-DOAE, CNRS UMR 8520, Université Lille Nord de France, France. gnassar@univ-valenciennes.fr
authors.forename: G
authors.initials: G
authors.lastname: Nassar
authors.forename: P
authors.initials: P
authors.lastname: Campistron
authors.forename: F
authors.initials: F
authors.lastname: Lefebvre
authors.forename: B
authors.initials: B
authors.lastname: Nongaillard