研究了采用侧面压迫式增敏和端面拉伸式增敏的无源光纤光栅水声传感器。采用灌注和弹性片端面增敏两种方案分别对光纤光栅传感器进行增敏。研究结果表明灌注方案谐振频率过低（300 Hz），高频灵敏度过低（小于-205 dB），且制作工艺要求比较复杂；弹性片端面增敏方案采用铍铜片进行增敏，在100~1000 Hz频率范围内灵敏度为(-175±2) dB。对端面增敏传感器进行了封装，并应用于水声的检测实验。实验表明，该传感器在灵敏度及灵敏度频响指标上已经可以满足应用要求。

Hydroacoustic sensor of the passive optical fiber grating sensitivity enhanced through side pressure and end surface pulling is investigated. The filling and the elastic slice is used to enhance the sensitivity of the optical fiber grating sensor. The research results indicate that the resonance frequency using the filling method is too low (300 Hz), and high frequency sensitivity is too low (<-205 dB) too. The technology is complex. The Be-Cu (beryllium-copper) elastic slice is used to enhance sensitivity. In a frequency range of 100~1000 Hz the sensitivity reaches (-175±2) dB. The casing of the enhanced sensitivity sensor is made and applied to water sound detection. The results indicate that its sensitivity and frequency response can meet the application requirement.