Quantifying Fish Backscattering using SONAR Instrument and Kirchhoff Ray Mode (KRM) Model

Sonar instrument was used to study backscattering from tuna fish. Extraction of target strength, incidence angle, and frequency dependence of the backscattered signal for individual scatterer was important for biological information. For this purpose, acoustic measurement of fish backscatter was con...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 739; no. 1; pp. 12055 - 12065
Main Author Manik, Henry M.
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.08.2016
Subjects
Acoustic measurement
Backscattering
Fish
Incidence angle
Physical properties
Physics
Sonar
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Summary:Sonar instrument was used to study backscattering from tuna fish. Extraction of target strength, incidence angle, and frequency dependence of the backscattered signal for individual scatterer was important for biological information. For this purpose, acoustic measurement of fish backscatter was conducted in the laboratory. Characteristics and general trends of the target strength of fish with special reference to tuna fish were investigated by using a Kirchhoff Ray Mode (KRM) model. Backscattering strength were calculated for the KRM having typical morphological and physical parameters of actual fish. Those backscattering amplitudes were shown as frequency, body length, backscattering patterns, the density and sound speed dependences, and orientation dependence. These results were compared with experimentally measured target strength data and good agreement was found. Measurement and model showed the target strength from the fish are depend on the presence of swimbladder. Target Strength increase with increasing the frequency and fish length.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/739/1/012055