Reflection and transmission at low concentration by a depth-varying random distribution of cylinders in a fluid slab-like region

Abstract : This paper reports a study of the backscattering behavior of a solid layer containing randomly spaced spherical cavities in the long wavelength limit. The motivation for the work arises from a need to model the responses of porous composite materials in ultrasonic NDE procedures. A comparison is made between models based on a summation over discrete scatterers, which show interesting emergent properties, and an integral formulation based on an ensemble average, and with a simple slab effective medium approximation. The similarities and differences between these three models are demonstrated. A simple quantitative criterion is established which sets the maximum frequency at which ensemble average or equivalent homogeneous medium models can represent echo signal generation in a porous layer for given interpore spacing, or equivalently, given pore size and concentration.
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Article dans une revue
Wave Motion, Elsevier, 2011, 130, pp.122. 〈10.1016/j.wavemoti.2009.06.015〉
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https://hal.sorbonne-universite.fr/hal-01587124
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Soumis le : mercredi 13 septembre 2017 - 16:42:23
Dernière modification le : mardi 5 juin 2018 - 10:14:26

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J.M. Conoir, S. Robert, A. El Mouhtadi, F. Luppé. Reflection and transmission at low concentration by a depth-varying random distribution of cylinders in a fluid slab-like region. Wave Motion, Elsevier, 2011, 130, pp.122. 〈10.1016/j.wavemoti.2009.06.015〉. 〈hal-01587124〉

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