High frequency roughness scattering from various rough surfaces: theory and laboratory experiments

Virginie Jaud 1 Jean-Pierre Sessarego 2 Cedric Gervaise 3 Yann Stephan 4
1 AP
STIC - Pôle STIC [Brest]
2 O&I - Ondes et Imagerie
LMA - Laboratoire de Mécanique et d'Acoustique [Marseille]
3 GIPSA-SIGMAPHY - SIGMAPHY
GIPSA-DIS - Département Images et Signal
Abstract : The scattering strength of isotropic and anisotropic rough surfaces was experimentally and theoretically investigated for high frequencies about 500 kHz. Emphasis was placed on studying the response from three two-dimensional rough sur-faces which roughness was either isotropic (characterized by a Gaussian distribution) or anisotropic (characterized by a modified-sine surface). Theoretical predictions rely on the first-order small slope approximation either including a Gaussian structure function or a quasi-periodic structure function. The combination of true data and theoretical results indicates the importance of taking into account the anisotropy of a surface in a scattering prediction process. It is shown that the scattering strength varies a lot depending on the propagation plane. In the longitudinal direction of ripples, scat-tering strength is mostly in the specular direction, whereas in the transversal direction of the ripples, the scattering strength is spread in a very different way related to the particular features of the ripples, with several maxima and min-ima independent of the specular direction. Contrary to the isotropic surface, the scattering strength from an anisotropic rough surface is modified from one propagation plane to another, which explains why the entire rough surface should be taken into account without any simplification as it is often seen when dealing with scattering models. Compared to such a surface, positions of the emitter and of the receiver are naturally significant when measuring scattering strength.
Type de document :
Article dans une revue
Open Journal of Acoustics, Scientific Research Publishing, 2012, 2 (1), pp.50-59. 〈10.4236/oja.2012.21005〉
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Soumis le : lundi 12 mars 2012 - 15:47:33
Dernière modification le : vendredi 11 mars 2016 - 01:02:07

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Virginie Jaud, Jean-Pierre Sessarego, Cedric Gervaise, Yann Stephan. High frequency roughness scattering from various rough surfaces: theory and laboratory experiments. Open Journal of Acoustics, Scientific Research Publishing, 2012, 2 (1), pp.50-59. 〈10.4236/oja.2012.21005〉. 〈hal-00678365〉

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