摘要
提出了一种新型的光纤布拉格光栅（FBG）水声传感探头结构以及光纤光栅传感信号的自解调方法。利用一对匹配光栅构成推挽结构，实现了传感一解调的合二为一，大大地减小了系统的复杂度；并通过筒状弹性体结构，解决了裸光纤光栅测量水声信号的灵敏度过小的问题，并具有温度补偿作用。仿真与初步实验结果表明，该水听器探头的测量动态范围超过100dB，在100-200 dB re 1μPa的水声压范围内，测量灵敏度为0．36nm／Mpa。
A new type of optical fiber underwater acoustic sensor （hydrophone） constructed with two fiber Bragg gratings （FBG） with signal self-demodulation function is presented. This fiber Bragg grating hydrophone uses a pair of matched fiber Bragg gratings with push-pull structure for both sensing and demodulating, which greatly reduces system complexity. The cylindrical structure of the hydrophone improves the sensitivity of the bare fiber Bragg grating acoustic sensors and also can compensate temperature. Simulation and preliminary experimental results indicate that the dynamic range of the hydrophone unit is beyond 100 dB and the measurement sensitivity can reach 0.36 nm/MPa for underwater acoustic pressure range 100-200 dB re 1μPa.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2007年第9期1575-1579,共5页
Acta Optica Sinica
基金
国家自然科学基金(50575111)
清华大学基础研究基金(JCqn2005025)资助课题
关键词
光纤光学
光纤光栅
水声传感器
水听器
自解调
fiber optics
fiber Bragg grating
acoustic sensor
hydrophone
self-demulation
