弛豫铁电单晶弯曲梁矢量水听器研究  

Research on the relaxor ferroelectric single crystal flexural beam vector hydrophone

作　　者：尹义龙[1,2] 李俊宝[1] 邢建新[1] 吕可佳[1] 

机构地区：[1]中国科学院声学研究所,北京100190 [2]中国科学院大学,北京100190

出　　处：《声学学报》2014年第2期243-250,共8页Acta Acustica

摘　　要：研制了一种弛豫铁电单晶(PMNT)二维矢量水听器,矢量通道和声压通道分别由两个正交压电单晶复合弯曲梁振子和PZT-5压电陶瓷圆管组成。基于弹性力学理论和水下质点振速测量原理对弯曲梁矢量水听器进行建模,推导给出了接收电压灵敏度表达式,分析了弯曲梁应力分布对矢量水听器接收性能的影响以及PMNT压电单晶材料与弯曲梁结构的匹配问题。在理论分析的基础上,研制了PMNT压电单晶和PZT、-5压电陶瓷矢量水听器样品并进行测试。测试结果表明:压电单晶矢量水听器与压电陶瓷矢量水听器相比,接收电压灵敏度提高11 dB,自噪声降低3 dB,测试结果与理论结果相符。A two-dimensional vector hydrophone is developed utilizing the PMNT relaxor ferroelectric single crystal, which is composed of a dual-axis piezoelectric composite flexural beam accelerometer and PZT-5 piezoelectric ceramic rings. Based on the principle of elastic mechanics and underwater particle velocity measurement, the receiving voltage sensitivity of the flexural beam vector hydrophone is derived. The influence of stress distribution in the flexural beam on the performance of hydrophone is analyzed, and the match between PMNT single crystal cells and the structure of flexural beam is studied. The tested results indicate that the PMNT hydrophone presents an 11 dB increase in sensitivity and a 3 dB decrease in self-noise than the PZT-5 one.

关 键 词：矢量水听器 弛豫铁电单晶 弯曲梁 电压灵敏度 压电陶瓷 压电单晶 弹性力学理论 接收性能 

分 类 号：TB565.1[交通运输工程—水声工程]