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    Orientation dependence of broadband acoustic backscattering from live squid

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    JAS004461.pdf (2.726Mb)
    Date
    2012-06
    Author
    Lee, Wu-Jung  Concept link
    Lavery, Andone C.  Concept link
    Stanton, Timothy K.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5244
    As published
    https://doi.org/10.1121/1.3701876
    DOI
    10.1121/1.3701876
    Keyword
     Acoustic signal processing; Acoustic variables measurement; Acoustic wave scattering; Backscatter; Numerical analysis 
    Abstract
    A controlled laboratory experiment of broadband acoustic backscattering from live squid (Loligo pealeii) was conducted using linear chirp signals (60–103 kHz) with data collected over the full 360° of orientation in the lateral plane, in <1° increments. The acoustic measurements were compared with an analytical prolate spheroid model and a three-dimensional numerical model with randomized squid shape, both based on the distorted-wave Born approximation formulation. The data were consistent with the hypothesized fluid-like scattering properties of squid. The contributions from the front and back interfaces of the squid were found to dominate the scattering at normal incidence, while the arms had a significant effect at other angles. The three-dimensional numerical model predictions out-performed the prolate spheroid model over a wide range of orientations. The predictions were found to be sensitive to the shape parameters, including the arms and the fins. Accurate predictions require setting these shape parameters to best describe the most probable squid shape for different applications. The understanding developed here serves as a basis for the accurate interpretation of in situ acoustic scattering measurements of squid.
    Description
    Author Posting. © Acoustical Society of America, 2012. 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 131 (2012): 4461-4475, doi:10.1121/1.3701876.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Journal of the Acoustical Society of America 131 (2012): 4461-4475
     

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