摘要
提出了一种具有高达65dB高光学信噪比的光纤布拉格光栅(FBG)动态应变传感系统。该方法基于可调光纤环形激光器结构,并采用马赫-泽德干涉仪(MZI)相位解调的方法实现FBG传感信号的解调。实验结果表明,在2km处FBG获取的传感信号达到了52dB电信噪比,从而获得了6.7×10-12/Hz1/2的高应变分辨率。
An in-fiber Bragg grating（FBG） sensing system with a high signal to noise ratio （SNR） of - 65 dB is proposed for the dynamic strain measurement,which is based on a tunable fiber ring laser configuration. The sensing signals of the FBGs are demodulated by using an im.balanced Mach-Zehnder interferometer （MZI） that combines with a tunable filter. Experimental results show that an excellent electrical SNR of 52dB is achieved for a FBG sensor located at 2km on the fiber link with a low pump laser power of only 100 mW, which leads to a strain resolution of 6.7 × 10^-12 /Hz1/2.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2008年第2期146-148,共3页
Journal of Optoelectronics·Laser
基金
国家自然科学基金重点资助项目(60537040)
