title: Three-dimensional modeling of acoustic backscattering from fluid-like zooplankton.
abstract: 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 for fluid-like zooplankton that is based on the distorted wave Born approximation (DWBA) and that makes use of high-resolution three-dimensional measurements of the animal's outer boundary shape. High-resolution computerized tomography (CT) was used to determine the three-dimensional digitizations of animal shape. This study focuses on developing the methodology for incorporating high-resolution CT scans into a scattering model that is generally valid for any body with fluid-like material properties. The model predictions are compared to controlled laboratory measurements of the acoustic backscattering from live individual decapod shrimp. The frequency range used was 50 kHz to 1 MHz and the angular characteristics of the backscattering were investigated with up to a 1 degree angular resolution. The practical conditions under which it is necessary to make use of high-resolution digitizations of shape are assessed.
authors.affiliation: Woods Hole Oceanographic Institution, Massachusetts 02543, USA.
authors.forename: Andone C
authors.initials: AC
authors.lastname: Lavery
authors.forename: Timothy K
authors.initials: TK
authors.lastname: Stanton
authors.forename: Duncan E
authors.initials: DE
authors.lastname: McGehee
authors.forename: Dezhang
authors.initials: D
authors.lastname: Chu