Abstract
A three‐dimensional, acoustic scattering model for squid has been developed that incorporates high‐resolution, spiral computerized tomography (SCT) scans of squid morphology. This model numerically implements the distorted wave Born approximation (DWBA) for an inhomogeneous body using a combined ray trace and volume integration approach. SCT scans of squid, taken in air, revealed detailed morphology of the animal including the interior cavity of the mantle. The model accounts for these features with volume elements that are small (less than 1/20 the wavelength) for the frequencies of interest (0–120 kHz). Target strength predictions are compared with published data from live, freely swimming squid. Although only two materials, mantle tissue and seawater, are used to represent squid in this study, our model can be easily generalized to include many distinct, weakly scattering regions within a volume. Ranges of validity with respect to material properties and numerical considerations are explored using benchmark computations with such simpler geometries as spherical and cylindrical shells.
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