50 kHz 체장어군탐지기용 분할 빔 음향 변환기의 개발
Development of Split-beam Acoustic Transducer for a 50 kHz Fish Sizing Echo Sounder
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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 (6×6 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 5 m×5 m×6 m (length×height×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°and -30 dB, respectively. However, the measured beam width at 3 dB was 21°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°. The transmitting voltage response was 161.5 dB (re 1 μPa/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/ μPa) at 49.8 kHz with a bandwidth of 2.64 kHz.
Abstract
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 (6×6 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 5 m×5 m×6 m (length×height×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°and -30 dB, respectively. However, the measured beam width at 3 dB was 21°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°. The transmitting voltage response was 161.5 dB (re 1 μPa/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/ μPa) at 49.8 kHz with a bandwidth of 2.64 kHz.
참고문헌 (16)
- Balanis CA, "Antenna Theory", pp.294~306 (1997), John Wiley & Son Inc
- Dolph, CL, "A current distribution for broadside arrays which optimizes the relationship between beam width and side-lobe level", Proc of the IRE, 통권 : 34, pp.335~348 (1946)
- Ehrenberg JE, "Analysis of a split beam backscattering cross section estimation and single echo isolation technique", APL-UW, 8108, pp.1~24 (1981)
- Report of the expert consultation on international guidelines for bycatch management and reduction of discards, "FAO", 1~37, pp.FAO fisheries and aquaculture report No. 934 (2009)
- Foote KG, "Designing an improved transducer array geometry", J Cons int Explor Mer, 46, pp.129~132 (1990)
- Hughes WJ, "Transducer, underwater acoustic", Encyclopedia of applied physics, 22, pp.67~84 (1998)
- Computer modeling of ultrasonic piezoelectric transducers, "Hughes WJ", Applied Research Lab, The Pennsylvania State Univ, 1~116, pp.Technical report No TR 96-007 (1969)
- Lee DJ, "Development of a split beam transducer for measuring fish size distribution", Bull Korean Soc Fish Tech, 37, pp.196~213 (2001)
- 이대재, "반파장 직경을 갖는 50kHz tonpilz형 음향 변환기의 설계, 제작 및 성능특성", 한국어업기술학회지, 46(2), pp.173~183 (2010), 한국어업기술학회
- MacLeannan DN, "Fisheries Acoustics", pp.45~88 (1995), Chaman & Hall
- Park HY, "Split-beam method for fish finder using a band-limited sweep signal", ICA2004, pp.759~760 (2004)
- Quaji AH, "Array beam response in the presence of amplitude and phase fluctuations", J Acoust Soc Am, 72, pp.171~180 (1982)
- Sawada K, "Development of an acoustic-optical system (J-QUEST) for fisheries surveys-Ⅰ. -Acoustic system", Tech Rep Nat Res Inst Fish Eng, 26, pp.23~33 (2004)
- Simrad AS, "70 kHz split-beam transducer", pp.1~2 (2008)
- Wilson OB, "Introduction to Theory and Design of Sonar Transducers", pp.11~108 (1991), Peninsula Publishing
- Ziomeck LJ, "Underwater Acoustics", pp.94~152 (1985), Academic Press Inc