Orientation dependence of broadband acoustic backscattering from live squid
Citable URI
https://hdl.handle.net/1912/5244As published
https://doi.org/10.1121/1.3701876DOI
10.1121/1.3701876Keyword
Acoustic signal processing; Acoustic variables measurement; Acoustic wave scattering; Backscatter; Numerical analysisAbstract
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
Suggested Citation
Journal of the Acoustical Society of America 131 (2012): 4461-4475Related items
Showing items related by title, author, creator and subject.
-
Three-dimensional modeling of acoustic backscattering from fluid-like zooplankton
Lavery, Andone C.; Stanton, Timothy K.; McGehee, Duncan E.; Chu, Dezhang (Acoustical Society of America, 2002-03)Scattering models that correctly incorporate organism size and shape are a critical component for the remote detection and classification of many marine organisms. In this work, an acoustic scattering model has been developed ... -
Higher-order acoustic diffraction by edges of finite thickness
Chu, Dezhang; Stanton, Timothy K.; Pierce, Allan D. (Acoustical Society of America, 2007-12)A cw solution of acoustic diffraction by a three-sided semi-infinite barrier or a double edge, where the width of the midplanar segment is finite and cannot be ignored, involving all orders of diffraction is presented. The ... -
The relative effect of particles and turbulence on acoustic scattering from deep sea hydrothermal vent plumes revisited
Xu, Guangyu; Jackson, Darrell R.; Bemis, Karen G. (Acoustical Society of America, 2017-03-03)The relative importance of suspended particles and turbulence as backscattering mechanisms within a hydrothermal plume located on the Endeavour Segment of the Juan de Fuca Ridge is determined by comparing acoustic backscatter ...