匹配层高频宽带水声换能器研究

Research on Matching Layer for High Frequency Broadband Underwater Acoustic Transducer

摘要:

为了获取更多的水下信息，提高声呐的探测和识别能力，设计高频宽带换能器是极为重要的。 匹配层技术是拓宽换能器带宽的有效方式。从理论上对匹配层拓宽换能器带宽的机理进行了分析，并利用数值计算和有限元仿真分析了匹配层对换能器性能的影响。结果表明：随着匹配层层数增加，换能器的谐振峰数目增加，峰与峰之间通过耦合能够实现拓宽带宽的效果。通过有限元仿真指导制成中心频率为 187.5 kHz 的双匹配层宽带换能器，其最大发送电压响应为 150.3 dB，–3 dB 带宽为 145 kHz。

Abstract:

In order to obtain more underwater information and improve the detection and identification capability of sonar，it is very important to design a high frequency broadband transducer. Matching layer technology is an effective way to broaden the bandwidth of the transducer. This paper theoretically analyzes the mechanism of the matching layer to broaden the bandwidth of the transducer，and uses numerical calculation and finite element simulation to analyze the effect of matching layer on the transducer performance. The results show that the number of the transducer’s resonance peaks increases as the number of the matching layers increases. The coupling between peaks can achieve the effect of broadening the bandwidth. In this paper，a dual-matched-layer broadband transducer with a center frequency of 180 kHz is made through finite element simulation guidance. Its maximum emission voltage response is 150.3 dB，and the bandwidth of -3 dB is 145 kHz.