A Study of a Wideband Acoustic Transducer for Underwater Communication Using 1-3 Type Piezoelectric Transducer

J. Ocean Eng. Technol. 2008;22(2):65-71.

Lee Kyung-Woo,So Hyoung-Jong,Lim Sil-Mook,Kim Won-Ho,Cho Wun-Hyun

Kyungwon Ferrite Ind. Co. Ltd.,Kyungwon Ferrite Ind. Co. Ltd.,Korea Polytechnic University,Agency of Defence and Development,Agency of Defence and Development

1-3형 압전 복합체를 이용한 광대역 수중 통신용 음향 트랜스듀서에 관한 연구

이경우,소형종,임실묵,김원호,조운현

경원 훼라이트공업㈜ 부설연구소,경원 훼라이트공업㈜ 부설연구소,한국산업기술대학교 신소재공학과,국방과학연구소 ⁶기술본부,국방과학연구소 ⁶기술본부

Keywords: Acoustic transducer, Wide band, Underwater communication, Piezoelectric composite, Transmission loss

핵심용어: 음향센서, 광대역, 수중 통신, 압전복합체, 전송손실

Abstract

Recently, many researches in relation to data transmission with faster speed and greater volume, many researches have been carried out on sonar systems for underwater communication. According to these researches, an acoustic transducer for underwater communication requires wide bandwidth properties. In domestic researches for underwater communication sonar, an operating frequency in the range of $20{sim}40;kHz$ is used. In this paper, we propose anon-resonance type acoustic transducer for underwater communication. The TVR (transmitting voltage response) characteristics increased linearly as the frequency increased, and the RVS (receiving voltage sensitivity) characteristics were constant as the frequency increased. Traditional techniques for wide bandwidth transducershave a limit and a transmission loss difference at lower and higher frequency operating ranges. In this paper, the new transducer proposed decreased the transmission loss under some conditions. It was optimized with the FE analysis tool (ATILA) and evaluated using the TVR and the RVS characteristics in the range of $10{sim}90;kHz$. The value of TVR was 138 dB at 20 kHz and 148 dB at 40 kHz, and the differences was 12 dB. The value of RVS was $195{pm}2;dB$ and nearly constant. From theseresults, it is certain that the developed transducers can be used for an underwater communication network in the 1.3 km range with both a 20 kHz bandwidth and 30 kHz center frequency.