Broadband Acoustic Backscatter and High-Resolution Morphology of Fish: Measurement and Modeling
Abstract
Remote detection and classification of marine organisms require accurate acoustic scattering models that adequately incorporate organism morphology. Broadband acoustic backscattering measurements, advanced high-resolution imaging of fish morphology using CT scans and phase contrast x-rays (in addition to traditional x-rays), and associated scattering modeling using the images have been conducted involving alewife (Alosa Pseudoharengus), a swimbladder-bearing fish. A greater-than-octave bandwidth (40-95 kHz), shaped, linearly swept, frequency modulated signal was used to insonify live, individual, adult alewife that were tethered while being rotated in 1- degree increments of orientation angle over all angles in two planes of rotation (lateral and dorsal/ventral). These data, in addition to providing the orientation dependence of the scattering over a continuous band of frequencies, were also used (after pulse compression) to identify the dominant scattering features of the fish (including the skull and swimbladder).
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2002
- Accession Number
- ADA409817
Entities
People
- D. B. Reeder
- J. Michael Jech
- Timothy K. Stanton
Organizations
- Woods Hole Oceanographic Institution