Excess ultrasonic attenuation due to inhomogeneities in porous media

Mouna Naas, Naima Sebaa, Zine Fellah, Mohamed Fellah, Walter Lauriks, Claude Depollier
2008 Journal of the Acoustical Society of America  
While Biot's theory seems well adapted to model the acoustical waves propagation in cancellous bone, some of its predictions do not agree with the experimental results. The excess of attenuation of the fast wave is one of these discrepancies. In this paper we propose a modified Biots model which takes into account the fluctuations of the physical parameters and their correlations. As a result of this model, we show that this excess of attenuation is due to several processes: i) classical Biot's
more » ... i) classical Biot's attenuation, ii) scattering leading to the extension of the wave path, iii) mode conversion. Some comparison between experimental results and numerical simulations are proposed.
doi:10.1121/1.2934898 fatcat:cje4dfoirnegfbswxqtikymwn4