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Changes in the Orientation and Frequency Dependence of Target Strength due to Morphological Differences in the Fish Swim Bladder
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 Title & Authors
Changes in the Orientation and Frequency Dependence of Target Strength due to Morphological Differences in the Fish Swim Bladder
Lee, Dae-Jae;
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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 in the dorsal plane and in approximately 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.
Broadband acoustic scattering;Orientation and frequency dependence;SINC model;Equivalent scattering size;Artificial swimbladder;
 Cited by
도루묵의 체내 변화에 따른 음향산란특성,윤은아;이경훈;황강석;이형빈;한인우;황두진;

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