title: Transmission of ultrasonic waves through porous layers of high flow resistivity saturated by air.
abstract: Transmission of ultrasonic waves through porous materials of high flow resistivity and porosity (in contact with air at both faces) is modelled and measured for an open-bubble foam at normal and oblique incidence. The importance of the airborne wave and the differences with the case of an elastic nonporous solid are demonstrated. A simple method to measure the shear modulus and the Poisson coefficient of the frame is suggested for similar materials.
authors.affiliation: Lab. voor Akoestiek en Thermische Fysica, Katholieke Univ., Leuven, Heverlee, Belgium.
authors.forename: L
authors.initials: L
authors.lastname: Kelders
authors.forename: W
authors.initials: W
authors.lastname: Lauriks
authors.forename: J F
authors.initials: JF
authors.lastname: Allard