Abstract
An approach is described to determine the density and the longitudinal and the shear velocities of elastic solid spheres based on their farfield response (the form function) in an insonified acoustic field. The processing scheme uses the information extracted from the characteristics of the form function within a finite frequency range. In particular, it is found that the rate of phase change with respect to frequency in the form function reveals three distinct types of reradiated modes, which are associated with their underlying physical causes. Their separated physical parameters can thus be determined accordingly. Examples with solid spheres constructed from different materials are used to illustrate the practical utilization of this study.
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