一种基于共振腔的新型水听器探究

提出了一种基于共振空气腔的高灵敏、低成本水听器。该水听器为密封的中空球形腔体,内部放置麦克风来感知从水耦合进来的声音。通过有限元仿真预测了水听器的频率响应,并证实频响曲线的特征峰依赖于空气腔共振模态、与球壳共振无关,因此,该水听器的频响特性只取决于内部空气腔尺寸。实验结果表明,该水听器的频率响应与仿真结果符合,与传统压电水听器相比其灵敏度有所提高,在共振频率处的接收灵敏度比传统压电水听器高10倍。

Research on a New Type of Hydrophone Based on Sealed Cavity

A high sensitive and low cost hydrophone based on resonant air cavity is proposed in this paper. The hydrophone is formed by a sealed hollow spherical shell/cavity with a microphone inside to sense the sound coupled from the water outside. The frequency response of the hydrophone is predicted by finite element simulation, and it is confirmed that the characteristic peak of the frequency response curve depends on the resonant mode of the air cavity and is independent of the shell resonance. Therefore, the resonant frequency of the hydrophone only depends on the size of the internal air cavity. The experimental results demonstrate that the frequency response of the hydrophone is consistent with the simulation results, and the sensitivity is improved compared with the conventional piezoelectric hydrophone. The receiving sensitivity at the resonant frequency is 10 times higher than that of the conventional piezoelectric hydrophone.