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자료유형
학술대회자료
저자정보
Kang, Donhyug (Ocean acoustics lab. Department of Earth and Marine Sciences, Hanyang University) Hwang, Doojin (Department of Marine sciences and Technology, Yosu National University) Na, Jungyul (Ocean acoustics lab. Department of Earth and Marine Sciences, Hanyang University) Kim, Suam (Department of Marine Biology, Pukyong National University)
저널정보
한국음향학회 한국음향학회 학술발표대회 한국음향학회 2000년도 하계학술발표대회 논문집 제19권 1호
발행연도
2000.1
수록면
233 - 236 (4page)

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The acoustical response of fish depends on size and physical structure na, most important, on the presence or absence of a swimbladder. Acoustic scattering models for swimbladdered fish represent a fish by an ideal pressure-release surface having the size and shape as the swimbladder. Target strength experiments of red seabream (Chrysophrys major) have been conducted using 38 (split-beam), 120 (split-beam) and 200kHz (dual-beam) frequencies. At each start of each experiment, the live fish are placed in the cage at the surface, then the cage is lowed to about $4{\cal}m$ depth where it remains during the measurements. To test the acoustic models, predictions of target strength based on swimbladder morphometries of 10 red seabream offish total length from $103{\cal}mm{\;}to{\;}349{\cal}mm$ ($3 <$TL/\lambda$ &lt; 45)are compared with conventional target strength measurements on the same, shock-frozen immediately after caged experiments. X-ray was projected along dorsal aspect to know the morphological construction of swimbladder. and fish body. At high frequencies, Helmholtz-kirchhoff(HK) approximation would greatly enhance swimbladdered fish modeling. Sound scattering model [HK-ray approximation model] for comparison to experimental target strength data was used to model backscatter measurements from individual fish. The scattering data can be used in the inverse method along with multiple frequency sonar systems to investigate the adequacy of classification and identification of fish

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