准1-3复合型压电换能器的研制

水声高频换能器在水声领域具有广泛运用,然而常规厚度振动高频换能器在高频段存在强烈的高次径向耦合振动,制作出的换能器出现了阻抗曲线杂乱,相位一致性差,电声效率低的问题。设计制作了一种单一振动模态的换能器,通过将常规厚度振动换能器陶瓷片切割成密排矩形颗粒,再用环氧树脂将切缝填充满。制作两片直径为55mm的准1-3复合材料,由该材料制作的换能器谐振频率为293kHz,谐振点阻抗50,3dB阻抗带宽23.5 kHz,3dB开角为5.75°,50W电功率输出声源级达到217.5dB。通过该工艺可以消除高频厚度振动换能器的高次径向耦合振动,提高高频厚度振动换能器的电声转换效率和一致性,并能实现批量制作,为高频换能器在水声领域的广泛运用提供了新的手段。

The study of similitude 1-3 piezo-composites transducer

For conventional high-frequency thickness vibration transducers, the strong presence of high-order radial coupled vibration at high frequencies leads to the problems of disordered transducer impedance curve, poor phase coherence and low electro-acoustic efficiency. A transducer with a single thickness vibration mode is developed. The ceramic of the conventional thickness vibration transducer is cut into close-packed rectangular particles through a special process, and then all joints are ffiled with epoxy resin. Two pieces of 55ram diameter quasi 1-3 composite material are produced, with the transducer resonant frequency achieved to 293 kHz, resonant impedance 50~, -3dB impedance bandwidth of 23.5 kI-Iz, -3dB open angle of 5.75 °, and output source level of 217.5dB for 50 watts of electric power. This process may eliminate the high-order radial coupled vibration of the high frequency thickness vibration transducer, and advance the electric-acoustic conversion efficiency and consistency. Batch manufacturing can be realized, which provides a new device for underwater acoustic applications.