Multiple scattering filtering for volumetric and plane defects

The ultrasonic inspection of polycrystalline coarse grain structures suffers from attenuation noise due to multiple scattering at grain boundaries within these materials. In this paper, we present the current state of affairs of our research in multiple scattering filtering, based on a method proposed by Aubry et al. [1] initially developed and validated on artificial scattering media consisting of fluids with a large number of cylindrical rods, and subsequently applied to polycrystalline alloys [2].