250 kHz收发一体化水声换能器

250 kHz transmitting and receiving integrated transducer

针对水声领域对兼有高效发射和高灵敏度接收、收发工作频带重合、结构一体化高频水声换能器的应用需求,该文研制了一种高灵敏度收发一体水声换能器。该换能器由发射单元和接收单元两部分嵌套组成,发射单元采用1-3复合材料,接收单元采用单金属板压电陶瓷阵列结构。首先,通过有限元模拟确定发射和接收单元频率使其满足收发一体条件;其次接收单元采取改变压电陶瓷结构提升了机电耦合系数,从而提升接收灵敏度;最后制备了换能器样机并进行测试。结果表明,发射单元共振频率和接收单元反共振频均在250 kHz附近,接收灵敏度最高可达-173:5 dB,满足收发一体条件和高灵敏性能。

In response to the application demand in the field of hydroacoustic for high efficiency transmitting and high sensitivity receiving,overlapping frequency bands of transmitting and receiving,and structurally integrated high frequency hydroacoustic transducer,in this paper,a high-sensitivity transducer with integrated transceiver is developed.The transducer consists of two nested transmitter and receiver units,with the transmitter unit using 1-3 composite materials and the receiver unit using a single metal plate piezoelectric ceramic array structure.Firstly,the frequencies of the transmitter unit and receiver unit are determined by finite element simulation to meet the transducer conditions.Secondly,the receiver unit adopts a modified piezoelectric ceramic structure to improve the electromechanical coupling coefficient and thus the reception sensitivity.Finally,the transducer prototype was prepared and tested.The results show that the resonant frequency of the transmitter unit is 249 kHz,the anti-resonant frequency of the receiver unit is 253 kHz,and the maximum sensitivity of the receiver unit is-173:5 dB,which satisfies the transceiver condition and high sensitivity performance.