반파장 직경을 갖는 50kHz tonpilz형 음향 변환기의 설계, 제작 및 성능특성
Design, fabrication and performance characteristics of a 50kHz tonpilz type transducer with a half-wavelength diameter
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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 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/ 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.
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 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/ 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.
참고문헌 (12)
- Dziedzic, A., "Broadband target strength functions of 3 species freshwater free-swimming fish, ICES Int", Symp. on Fish. & Plank, pp.1~9 (1995)
- Harris, G.R., "Interlaboratory evaluation of hydrophone sensitivity calibration from 0.1 to 2MHz via time delay spectrometry", Ultrasonics, 42, pp.349~353 (2004)
- Hughes, W.J., "Transducer, underwater acoustic", Encyclopedia of applied physics, 22, pp.67~84 (1998)
- Computer modeling of ultrasonic piezoelectric transducers, "Hughes, W.J.", The Pennsylvania State Univ, 116~, pp.Technical report No. TR 96 007 (1969)
- MacLennan, D.N., "Fisheries Acoustics", pp.13~20 (1992), Chapman & Hall
- Rosenbaum, J.F., "Bulk Acoustic Wave", pp.371~410 (1988), Artech House
- Shuyu, L., "Study on the sandwich piezoelectric ceramic ultrasonic transducer in thickness vibration", Smart Mater. Struct, 17, pp.1~9 (2008)
- Simmonds, E.J., "Species identification using wideband backscatter with neural network and discriminant analysis", ICES Int. Symp. on Fish. and Plank, pp.1~14 (1995)
- Stansfield D., "Underwater Electroacoustic Transducers", pp.196~266 (1991), Bath Univ. Press
- Tse, M., "Impedance matching", pp.53~ (2003), Technical note for high frequency circuit design elective
- Wilson, O.B., "Introduction to Theory and Design of Sonar Transducers", pp.11~108 (1991), Peninsula Publishing
- Zakharia, M.E., "Wide band sounder for fish species identification at sea", ICES Int. Symp. on Fish. and Plank, pp.1~9 (1995)