Experimental Evidence of Single and Multiple Scattering in Polycrystalline Materials

Abstract

The backscatter coefficient, η(ω), is a material dependent acoustic parameter. As such, a reliable estimate of η(ω) may provide information concerning the microstructure and material properties for various engineering materials [1–4]. Current methods for properly estimating η(ω) are limited to cases in which the single scattering assumption is valid. Many models for grain noise also rely upon the validity of the single scattering assumption [5–9]. When attempting to validate models based upon the single scattering assumption, one must first verify that the single scattering assumption is valid. Therefore, a methodology is needed to determine if the single scattering assumption is in fact valid or if multiple scattering is significant.