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提出使用基于半导体光放大器(SOA)的环形激光器与可调谐光纤型法布里-珀罗(F-P)滤波器作为扫描光源的光纤布拉格光栅(FBG)解调方案,综合使用梳状滤波器与乙炔气体的吸收谱进行谱线标定,采用数字信号处理算法进行时域滤波与3dB功率寻峰算法。实验证明,该解调方案可以同时实现对超过1000个温度FBG,或240个应变传感光栅进行解调,解调频率达到1000Hz,波长分辨率达到0.5pm,温度检测精度达到0.05℃,应变检测精度达到0.6με。
A fiber Bragg grating (FBG) demodulation scheme using a ring laser based on a semiconductor optical amplifier (SOA) and a tunable fiber Fabry-Perot (FP) filter as a scanning light source is proposed. Combining a comb filter with an acetylene Gas absorption spectrum calibration, the use of digital signal processing algorithms for time-domain filtering and 3dB power peak search algorithm. Experiments show that the demodulation scheme can demodulate more than 1000 FBGs or 240 strain sensing gratings at the same time. The demodulation frequency reaches 1000Hz, the wavelength resolution reaches 0.5pm, the temperature detection accuracy reaches 0.05 ℃, the strain detection Accuracy of 0.6με.