高频宽带换能器多匹配层研究

在水声应用中，高频换能器往往需要较宽的工作带宽，以获得更多的目标信息。文章首先建立了等效电路模型，利用粒子群算法对匹配层材料和厚度进行初步选定，使得换能器具有最宽的工作频带；其次，通过有限元方法对匹配层换能器的导纳和发射电压响应进行分析计算；最后，在理论分析的基础上成功制得三匹配层高频宽带换能器，其工作频段约为150～430 kHz，相对带宽为93%，带内发送电压响应起伏为-6 dB。实验结果表明，三匹配层设计方案可以有效拓宽高频换能器的工作频段。

Research on multiple matching layers of high frequency wideband transducer

In underwater acoustic applications, high frequency transducers often need a wider working bandwidth to obtain more target information. In this paper, the equivalent circuit model is established firstly, and the material and thickness of the matching layer are selected by using particle swarm optimization so that the transducer has the widest working band. Secondly, the finite element method is used to analyze and calculate the admittance and emission voltage response of the transducer with matched layers. Finally, on the basis of theoretical analysis, the high-frequency broadband transducer with three matching layers is successfully fabricated. The working frequency band of the transducer is about 150-430 kHz, the relative bandwidth is 93%, and the fluctuation of the transmitting voltage response is-6 dB. The experimental results show that the design of three matching layers can effectively broaden the working bandwidth of high frequency transducer.