一种多模宽带水声换能器设计

随着水声信号处理技术的快速方展，需要从水声换能器获取更多的信息量，因而对水声换能器提出更高的带宽要求。本文设计了一种宽带纵振换能器，该换能器利用前盖板的弯曲振动与换能器的纵向振动耦合展宽频带。采用有限元方法模拟了换能器的电声特性，并制作了换能器样品。样品测试结果表明，换能器的带宽特性与模拟结果一致：发送电压响应级最大值139dB，-3dB带宽超过一个倍频程，且低频端小于15kHz。因此，该换能器具有低频、宽带、响应级高的优点。

A Design of Multiple-mode Broadband Underwater Tonpilz Transducer

With the rapid development of underwater acoustic signal processing technique, more and more information needs to be obtained from transducers, and the working frequency band of underwater acoustic transducers ought to be broader. A broadband underwater Tonpilz transducer was designed by using the coupling of transducer＇s longitudinal vibration mode and the bending vibration mode of front mass to widen its frequency band. The electro-acoustic characteristics of the transducer was simulated with finite element method. The prototype transducers were made based on the results of simulations and tested. Experimental results show that the broadband characteristics of the Tonpilz transducer agree well with the simulation results. Its maximum transmitting voltage response level is 139 dB, -3dB bandwidth is beyond one octave, and low frequency is below 15kHz. Thus the designed transducer has the advantages of low frequency, broadband and high response level.