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Design, fabrication and performance characteristics of a 50kHz tonpilz type transducer with a half-wavelength diameter

반파장 직경을 갖는 50kHz tonpilz형 음향 변환기의 설계, 제작 및 성능특성

  • Lee, Dae-Jae (Division of Marine Production System Management, Pukyong National University) ;
  • Lee, Won-Sub (Dept. of Harbor and Marine Products, Gangseo District Office, Busan Metropolitan)
  • 이대제 (부경대학교 해양생산시스템관리학부) ;
  • 이원섭 (부산광역시 강서구청 항만수신과)
  • Received : 2010.03.08
  • Accepted : 2010.04.08
  • Published : 2010.05.31

Abstract

In a split beam echo sounder, the transducer design needs to have minimal side lobes because the angular position and level of the side lobes establishes the usable signal level and phase angle limits for determining target strength. In order to suppress effectively the generation of unwanted side lobes in the directivity pattern of split beam transducer, the spacing and size of the transducer elements need to be controlled less than half of a wavelength. With this purpose, a 50 kHz tonpilz type transducer with a half-wavelength diameter in relation to the development of a split beam transducer was designed using the equivalent circuit model, and the underwater performance characteristics were measured and analyzed. From the in-air and in-water impedance responses, the measured value of the electro-acoustic conversion efficiency for the designed transducer was 51.6%. A maximum transmitting voltage response (TVR) value of 172.25dB re $1{\mu}Pa/V$ at 1m was achieved at 52.92kHz with a specially designed matching network and the quality factor was 10.3 with the transmitting bandwidth of 5.14kHz. A maximum receiving sensitivity (SRT) of -183.57dB re $1V/{\mu}Pa$ was measured at 51.45kHz and the receiving bandwidth at -3dB was 1.71kHz. These results suggest that the designed tonpilz type transducer can be effectively used in the development of a split beam transducer for a 50kHz fish sizing echo sounder.

Keywords

50kHz tonpilz type transducer;Half-wavelength diameter;TVR;SRT

Acknowledgement

Supported by : 한국연구재단

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  2. Design and Development of a Broadband Ultrasonic Transducer Operating over the Frequency Range of 40 to 75 kHz vol.47, pp.3, 2014, https://doi.org/10.5657/KFAS.2014.0292
  3. Development of Split-beam Acoustic Transducer for a 50 kHz Fish Sizing Echo Sounder vol.44, pp.4, 2011, https://doi.org/10.5657/KFAS.2011.0413
  4. Bandwidth Enhancement of a Broadband Ultrasonic Mosaic Transducer using 48 Tonpilz Transducer Elements with 12 Resonance Frequencies vol.47, pp.3, 2014, https://doi.org/10.5657/KFAS.2014.0302