【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。更多还原

【Abstract】 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 imbalanced 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.更多还原