Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Bandwidth Improvement of a Multi-resonant Broadband Acoustic Transducer

다중 공진 광대역 음향변환기의 대역폭 개선

  • Lee, Dae-Jae (Division of Marine Production System Management, Pukyong National University)
  • 이대재 (부경대학교 해양생산시스템관리학부)
  • Received : 2017.09.27
  • Accepted : 2017.10.12
  • Published : 2017.10.31
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Abstract

A multi-resonant broadband acoustic transducer with six Tonpilz elements operating at different resonant frequencies in a transducer assembly was fabricated, tested, and analyzed. A compensated transducer, modified by adding series inductance to the developed multi-resonant broadband transducer, was shown to provide improved bandwidth performance with a relatively more uniform frequency response compared with the uncompensated transducer. By controlling the series inductance, flat frequency response characteristics at two frequency bands were obtained over the range 38-52 kHz with 1.1 mH inductance and 50-60 kHz with 0.4 mH inductance. These results suggest that the operating frequency of the developed multi-resonant broadband transducer in a chirp echo sounder can be shifted to a different frequency band that is optimized according to the environment for more effective echo surveys of fishing grounds.

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References

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