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

6th Asian Physics Symposium

Manik, Henry M.^1

Department of Marine Science and Technology, Faculty of Fisheries and Marine Sciences, Bogor Agricultural University, Kampus IPB Dramaga, Bogor, Indonesia^1

关键词: Acoustic measurements;    Backscattered signal;    Backscattering amplitude;    Backscattering strength;    Biological information;    Frequency dependence;    Orientation dependence;    Physical parameters;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/739/1/012055/pdf
DOI  :  10.1088/1742-6596/739/1/012055

来源: IOP

【 摘 要 】

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.