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介绍了用匹配光纤布拉格光栅 (FBG)对振动传感进行直接的光强调制 ,从而完成传感及解调过程的方法。首先从理论上推导了光纤光栅的反射、透射谱的表达式 ,对光纤光栅的传感机制给出了定性的解释 ,并建立了数学模型进行模拟。进而报道了利用匹配光纤光栅进行单点解调 ,将振动传感信号变为解调光栅的输出光强信号 ,从而进行检测的方法。实验结果与理论吻合得很好 ,证明该方法是可行的
The method of directly sensing the intensity of light with matched fiber Bragg grating (FBG) is introduced to complete the sensing and demodulation process. Firstly, the expressions of the reflection and transmission spectra of FBG are deduced theoretically. The sensing mechanism of FBG is given qualitative explanation and the mathematical model is established for simulation. Furthermore, a method of single-point demodulation using a matched fiber grating and a method of detecting the output signal by changing the vibration sensing signal into the output light intensity signal of the demodulation grating is reported. The experimental results are in good agreement with the theory, which proves that the method is feasible