采用光纤布喇格光栅作为基本传感器件,设计制作了光纤光栅水听器.利用匹配光纤光栅解调技术,实现了高灵敏度、高速度的动态信号测量,并进行了相关的水下声音测量实验.实验系统可测量水声信号频率范围为10 Hz～3 kHz,测量动态范围为60 dB,其结果具有很高的线性度.

The FBG being used as the basic sensor unit, a hydrophone sensor has been designed and manufactured. Its principle and relevant experimental result are introduced. By using the matched fiber grating demodulation technique, dynamic signal measurement with high sensitivity is realized. The frequency range of the FBG-based hydrophone is 10~3 kHz with a dynamic range of 60 dB. Due to the characters of FBG itself, the measure of multiple-points underwater signal can be realized conveniently by using WDM and TDM techniques.