基于密集波分复用技术的Bragg光栅水听器

Bragg Grating Hydrophone Based on Dense Wave Division Multiplexing

论述了用Bragg光栅制作水听器的原理和意义,利用光纤通信的密集波分技术,实现声压信号动态解调采用压力增敏材料对Bragg光栅封装来增加其响应灵敏度,为避免温度变化引起光栅交叉敏感,在室温23±1℃条件下进行试验,给出实验结果实验表明基元水听器的频率响应平坦度好。

The principle and purpose of Bragg grating hydrophone are introduced. The technique of dense wave division multiplexing is used to process the acoustic wave signal. The sensitivity of FBG hydrophone is enhanced by encapsulated the FBG with pressure sensitive polymer. To prevent cross sensing to FBG from temperature, FBG hydrophone test is operated under the condition of room temperature 23±1℃,and the results are offered. The FBG hydrophones detect an acoustic field with good performances: wide and flat operation frequency,stable signal output. The test indicates that the method of processing the detecting acoustic field in DWDM is effective.