title: Identification of parametric models for ultrasonic wave propagation in the presence of absorption and dispersion.
abstract: Acoustic wave propagation in an absorptive and dispersive medium is usually described using models derived from a nearly local form of the Kramers-Kronig relationship, e.g., Q- and relaxation models. A modeling approach based on rational transfer function models for the generalized Hooke's law is presented. The assumptions and restrictions of models based on the nearly local absorption-dispersion relations and rational transfer function models are discussed. Using identification techniques, it is experimentally shown that the rational transfer function models explain the ultrasonic wave propagation in an absorptive-dispersive medium much better than the classical Q-models.
authors.affiliation: Dept. of Electr. Meas., Vrije Univ., Brussels.
authors.forename: L
authors.initials: L
authors.lastname: Peirlinckx
authors.forename: R
authors.initials: R
authors.lastname: Pintelon
authors.forename: L P
authors.initials: LP
authors.lastname: Van Biesen