Characterization and modeling of ultrasonic structural noise in the multiple scattering regime

Thomas Bedetti (1) , Vincent Dorval (2) , Frédéric Jenson (1) , Arnaud Derode (3)

1 LMC (CEA, LIST) - Laboratoire Méthodes CND (CEA, LIST)
2 LSMA (CEA, LIST) - Laboratoire Simulation et Modélisation Acoustique (CEA, LIST)
3 IL - Institut Langevin - Ondes et Images (UMR7587)

Multiple scattering can occur when performing ultrasonic measurements on highly scattering materials such as coarse grain steel or concrete. It constitutes in general a limiting factor for NDE techniques. In this communication, a method to simulate the structural noise due to multiple scattering is described. It requires three parameters: the diffusion constant, the elastic mean free path and the correlation distance. A method to obtain these parameters based on a single measurement procedure is presented. This approach has been applied to samples of coarse grain steel. The backscattered noise has been calculated for different probes and compared to experimental signals.

Mots clés: Ultrasound; Grain Noise; Multiple Scattering

Domaines: Physique [physics]

Thomas Bedetti, Vincent Dorval, Frédéric Jenson, Arnaud Derode. Characterization and modeling of ultrasonic structural noise in the multiple scattering regime. AIP Conference Proceedings, 1511, pp.1158-1165, 2013, Review of progress in quantitative nondestructive evaluation, vols 32a and 32b, ⟨10.1063/1.4789174⟩. ⟨cea-01828194⟩