Iterative high-resolution wavenumber inversion applied to broadband acoustic data

Philippe Roux (1) , Franck D. Philippe (2) , Didier Cassereau (2)

1 LGIT - Laboratoire de Géophysique Interne et Tectonophysique
2 LOA - Laboratoire Ondes et Acoustique (UMR 7587)

This paper presents the results of an iterative high-resolution wavenumber inversion algorithm applied to acoustic waveguides in which wave propagation is described by propagating modes. Following work on the first description of the inversion algorithm, a generalization to broadband signals is performed and experimental data are investigated. The algorithm leads to dispersion curves for propagating modes in the case of an ultrasonic waveguide and an elastic plate. Results are compared with spatial-temporal Fourier transforms.

Mots clés: Fourier transforms; acoustic waveguides; iterative methods; plates (structures); ultrasonic propagation

Domaines: Géophysique [physics.geo-ph]

Philippe Roux, Franck D. Philippe, Didier Cassereau. Iterative high-resolution wavenumber inversion applied to broadband acoustic data. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2008, 55 (10), pp.2306 à 2311. ⟨10.1109/TUFFC.929⟩. ⟨insu-00372057⟩