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在分析了 2种光纤光栅传感器解调技术的优缺点之后 ,结合两者之长提出了一种新型的光纤 Bragg光栅(FBG)振动传感解调方案。该解调方案的新颖之处在于提出了一种用反馈电路实现的对光纤 Bragg光栅反射波长移位进行自动跟踪的探测方法 ,该反馈电路用以驱动法布里 -珀罗腔 (F- P:Fabri- Perot)。利用当法布里 -珀罗腔满足特定条件时其透射光可达到最强或最弱原理 ,建立了 F- P腔解调系统模型。
After analyzing the advantages and disadvantages of the two fiber grating sensor demodulation techniques, a novel fiber Bragg grating (FBG) vibration sensing demodulation scheme is proposed based on the combination of the two. The novelty of the demodulation scheme lies in that a detection method for automatically tracking the wavelength shift of a fiber Bragg grating by a feedback circuit is proposed, which is used to drive a Fabry-Perot cavity (F-P : Fabri-Perot). When the Fabry-Perot cavity satisfies the specific conditions, the transmitted light can reach the strongest or the weakest, and the F-P cavity demodulation system model is established.