압전 단결정을 이용한 고감도 광대역 링 트랜스듀서의 수중 음향특성 분석

Abstract

In this study, the design and underwater acoustic characteristics of a ring transducer composed of a piezoelectric single crystal as the active material was reported. The PIN-PMN-PT piezoelectric single crystals with improved thermal durability have superior piezoelectric performance compared to PZT-4, widely used in underwater acoustic sensors. A 33-mode ring transducer was designed and its acoustic characteristics were estimated through electro-mechanical-acoustic coupled analysis. Furthermore, the acoustic characteristics of the ring transducers, composed of piezoelectric single crystals or PZT-4, were compared. The piezoelectric single crystals ring transducer is expected to have a higher transmitting voltage response (TVR) and receiving voltage sensitivity (RVS) compared to the PZT-4 ring transducer due to a high electro-mechanical coupling coefficient. It is also expected to have wideband performance due to a low mechanical quality factor. The acoustic characteristics of the fabricated piezoelectric single crystals ring transducer were measured and analyzed with the results of the electro-mechanical-acoustic coupled analysis. Upon applying piezoelectric single crystals as active materials, the ring transducer provided high sensitivity and broadband performance.