Abstract
Characterization of diffuse ultrasonic scattering is challenging because accurate models require assumptions about the degree of scattering. Most previous research has focused on the single-scattering regime in which rays are assumed to scatter only once before detection. In this presentation, scattering effects beyond single scattering are examined with a focus on polycrystalline materials. The contribution of the second scattering within the response is quantified with respect to measurement parameters and sample properties. The results show that single-scattering models are appropriate for weakly scattering materials, such as aluminum, for a wide range of experiments and grain sizes. However, stronger scattering materials are predicted to have significant components beyond single-scattering for certain measurement parameters even in the Rayleigh regime. Experimental results for a steel alloy are used to verify model predictions. The experimental work shows the domain for which the doubly-scattered resp...
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