어류 부레의 형태학적 차이에 따른 음향산란강도의 자세 및 주파수 의존성의 변화

DOI QR코드

DOI QR Code

이대재
Lee, Dae-Jae

  • 투고 : 2015.03.19
  • 심사 : 2015.04.10
  • 발행 : 2015.04.30

초록

Controlled broadband acoustic scattering laboratory experiments were conducted using a linear chirp signal (95-220 kHz), and x-ray images of live and model fish with an artificial swim bladder were analyzed to investigate the changes in orientation and frequency dependence of target strength (TS) due to morphological differences in fish swim bladders. The broadband echoes from live and model fish were measured over an orientation angle range of ${\pm}45^{\circ}$ in the dorsal plane and in approximately $1^{\circ}$ increments. The location of nulls in the simulated echo response of the SINC [sinc function] model was overlaid on the TS map, showing the orientation and frequency dependence of fish TS, and they matched very well. It was possible to infer the equivalent fish scattering size (or swim bladder) using the null spacing in the experimentally obtained broadband TS map. Good agreement was observed for inferring the equivalent scattering size between the SINC model and the broadband echoes measured for the three fish species (black scraper Thamnaconus modestus; goldeye rockfish Sebastes thompsoni; and whitesaddled reef fish Chromis notatus). Some results of this inference are discussed.

키워드

Broadband acoustic scattering;Orientation and frequency dependence;SINC model;Equivalent scattering size;Artificial swimbladder

참고문헌

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피인용 문헌

  1. 1. Acoustical backscattering characteristic depending on the changes in the body of sandfish (Arctoscopus japonicus) vol.52, pp.1, 2016, doi:10.5657/KFAS.2015.0233
  2. 2. Acoustic Identification of Six Fish Species using an Artificial Neural Network vol.49, pp.2, 2016, doi:10.5657/KFAS.2015.0233
  3. 3. Time-Frequency Feature Extraction of Broadband Echo Signals from Individual Live Fish for Species Identification vol.49, pp.2, 2016, doi:10.5657/KFAS.2015.0233

과제정보

연구 과제 주관 기관 : 한국연구재단