基于光纤布拉格光栅应变传感器的解调原理，分析了传感器性能蜕化时应变传感系统中解调异常的问题，通过理论推导及模拟仿真，发现了存在解调的测量峰值波长少于实际传感器数量的现象，并提出了解决方法，在工程应用中对此进行了验证，证实了方法的有效性。

Based on the demodulating theory of FBG, the problem of abnormal demodulation on the fiber Bragg grating strain sensor is analyzed as the performance of FBG sensor degenerated. The phenomenon of demodulating peak value less than the number of sensors is discovered by theoretical deduction and simulation. The solution is presented. The experimental results show that the method is Valid.