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    Use of the distorted wave Born approximation to predict scattering by inhomogeneous objects : application to squid

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    Jones-et-al_JASA.pdf (567.3Kb)
    Date
    2009-01
    Author
    Jones, Benjamin A.  Concept link
    Lavery, Andone C.  Concept link
    Stanton, Timothy K.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/2716
    As published
    https://doi.org/10.1121/1.3021298
    DOI
    10.1121/1.3021298
    Keyword
     Acoustic wave scattering; Approximation theory; Bioacoustics; Computerised tomography; Inhomogeneous media; Underwater sound; Zoology 
    Abstract
    A new method has been developed to predict acoustic scattering by weakly scattering objects with three-dimensional variability in sound speed and density. This variability can take the form of inhomogeneities within the body of the scatterer and/or geometries where the acoustic wave passes through part of the scattering body, into the surrounding medium, and back into the body. This method applies the distorted wave Born approximation (DWBA) using a numerical approach that rigorously accounts for the phase changes within a scattering volume. Ranges of validity with respect to material properties and numerical considerations are first explored through comparisons with modal-series-based predictions of scattering by fluid-filled spherical and cylindrical fluid shells. The method is then applied to squid and incorporates high resolution spiral computerized tomography (SCT) scans of the complex morphology of the organism. Target strength predictions based on the SCT scans are compared with published backscattering data from live, freely swimming and tethered squid. The new method shows significant improvement for both single-orientation and orientation-averaged scattering predictions over the DWBA-homogeneous-prolate-spheroid model.
    Description
    Author Posting. © Acoustical Society of America, 2009. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 125 (2009): 73-88, doi:10.1121/1.3021298.
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    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Journal of the Acoustical Society of America 125 (2009): 73-88
     

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