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为实现高空间分辨率和高测量精度的准分布式光纤光栅应变传感系统,研究了基于时分复用光纤光栅传感系统的解调和标定方法。将波分复用和时分复用技术相结合,得到两个低反射率光纤光栅的应变灵敏度分别为33.40με/mV和38.47με/mV,标定的非线性误差为2.8%。基于光纤光栅光谱边缘滤波技术,构建时分复用光纤光栅应变传感系统,提出复用光纤光栅应变的交叉传感解调算法,实验测试并解调两个光纤光栅的交叉传感数据。实验分析表明,单次测量传感系统的最大误差为18με,应变量大于100με时的传感相对误差小于5%,满量程600με的引用误差小于2%。
In order to realize the quasi-distributed FBG strain sensing system with high spatial resolution and high measurement accuracy, the demodulation and calibration methods based on time-division multiplexing FBG sensing system are studied. Combining WDM with time-division multiplexing, the strain sensitivities of the two low reflectivity FBGs are 33.40με / mV and 38.47με / mV, respectively. The calibration nonlinearity error is 2.8%. Based on the spectral edge filter technology of fiber grating, time-multiplexed fiber grating strain sensing system was constructed. The cross-sensing demodulation algorithm of multiplexed fiber grating strain was proposed. The cross-sensing data of two fiber gratings were experimentally tested and demodulated. Experimental results show that the maximum error of a single measurement sensor system is 18με, the relative error of sensing is less than 5% when the strain is greater than 100με, and the reference error of 600με is less than 2%.