DOI QR코드

DOI QR Code

50 kHz 체장어군탐지기용 분할 빔 음향 변환기의 개발

Development of Split-beam Acoustic Transducer for a 50 kHz Fish Sizing Echo Sounder

  • 이대재 (부경대학교 해양생산시스템관리학부) ;
  • 이원섭 (부산광역시 강서구청)
  • Lee, Dae-Jae (Division of Marine Production System Management, Pukyong National University) ;
  • Lee, Won-Sub (Gangseo District Office, Busan Metropolitan)
  • 투고 : 2011.04.12
  • 심사 : 2011.07.27
  • 발행 : 2011.08.30

초록

An improved split-beam transducer for a 50 kHz fish-sizing echo sounder was developed. The main objective of this study was to minimize the side lobe level in the beam pattern and the distance between acoustic centers for adjacent transducer quadrants in the geometrical arrangement of array elements while maintaining a given number of transducer elements and beam width. To achieve these goals, a 32-element planar array transducer ($6{\times}6$ array with one element in each corner missing) was designed using the Dolph-Chebyshev shading function to suppress side lobes in the array beam pattern and fabricated by arranging the inter-element spacing to be substantially equal to half the wavelength using the transducer element of 0.4 times the wavelength in diameter. The performance characteristics of this split-beam transducer were evaluated in the experimental water tank of $5m{\times}5m{\times}6m$ (length${\times}$height${\times}$width). In this study, the design goal of the beam width and side lobe level for transmitting a beam pattern was initially set at $21^{\circ}$ and -30 dB, respectively. However, the measured beam width at 3 dB was $21^{\circ}$ in both directions with side lobe levels of -24.7 dB in the horizontal plane and -25.6 dB in the vertical plane. The averaged beam width at -3 dB of the receiving beam patterns for four receiving quadrants was $31.4^{\circ}$. The transmitting voltage response was 161.5 dB (re $1{\mu}Pa$/V at 1 m) at 50.23 kHz with a bandwidth of 2.16 kHz, and the averaged receiving sensitivity for four receiving quadrants was -178.13 dB (re 1 V/${\mu}Pa$) at 49.8 kHz with a bandwidth of 2.64 kHz.

키워드

참고문헌

  1. Balanis CA. 1997. Antenna Theory. John Wiley & Son Inc, New York, U.S.A., 294-306.
  2. Dolph, CL. 1946. A current distribution for broadside arrays which optimizes the relationship between beam width and side-lobe level. Proc of the IRE 34, 335-348. https://doi.org/10.1109/JRPROC.1946.225956
  3. Ehrenberg JE. 1981. Analysis of a split beam backscattering cross section estimation and single echo isolation technique. APL-UW 8108, 1-24.
  4. FAO. 2009. Report of the expert consultation on international guidelines for bycatch management and reduction of discards. FAO fisheries and aquaculture report No. 934. 1-37.
  5. Foote KG. 1990. Designing an improved transducer array geometry. J Cons int Explor Mer 46, 129-132. https://doi.org/10.1093/icesjms/46.2.129
  6. Hughes WJ. 1998. Transducer, underwater acoustic. Encyclopedia of applied physics 22, 67-84.
  7. Hughes WJ and Zipparo MJ. 1969. Computer modeling of ultrasonic piezoelectric transducers. Technical report No TR 96-007, Applied Research Lab, The Pennsylvania State Univ, Pennsylvania, U.S.A., 1-116.
  8. Lee DJ and Shin HI. 2001. Development of a split beam transducer for measuring fish size distribution. Bull Korean Soc Fish Tech 37, 196-213.
  9. Lee DJ and Lee WS. 2010. Design, fabrication and performance characteristics of a 50kHz tonpilz type transducer with a half-wavelength diameter. J Kor Soc Fish Tech 46, 173-183. https://doi.org/10.3796/KSFT.2010.46.2.173
  10. MacLeannan DN and Simmonds EJ. 1995. Fisheries Acoustics. Chaman & Hall, London, U.K., 45-88. https://doi.org/10.3796/KSFT.2010.46.2.173
  11. Park HY, Kim MJ, Lee DJ, Yoon JR, Kim CD and Abe M. 2004. Split-beam method for fish finder using a band-limited sweep signal. ICA 2004, 759-760.
  12. Quaji AH. 1982. Array beam response in the presence of amplitude and phase fluctuations. J Acoust Soc Am 72, 171-180. https://doi.org/10.1121/1.388001
  13. Sawada K, Takao Y, Takahashi H, Abe K, Okumura K, Kobayashi A and Sugimoto M. 2004. Development of an acoustic-optical system (J-QUEST) for fisheries surveys-Ⅰ. -Acoustic system-. Tech Rep Nat Res Inst Fish Eng 26, 23-33. https://doi.org/10.1121/1.388001
  14. Simrad AS. 2008. 70 kHz split-beam transducer. ES 70-11 catalog, 1-2.
  15. Wilson OB. 1991. Introduction to Theory and Design of Sonar Transducers. Peninsula Publishing, California, U.S.A., 11-108.
  16. Ziomeck LJ. 1985. Underwater Acoustics. Academic Press Inc, New York, U.S.A., 94-152.

피인용 문헌

  1. 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
  2. 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