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提出一种动态非本征法布里-珀罗(F-P)腔对波长的解调方法。利用压电陶瓷(PZT)构建的动态非本征F-P腔调制光纤布拉格光栅(FBG)反射光,理论分析得到调制光强随F-P腔的腔长改变呈类余弦变化。经数值模拟,当PZT在正弦电压驱动下,F-P腔调制输出的类余弦信号因FBG波长的变化产生了信号曲线的位移,且位移量与FBG波长的变化量呈线性关系,此关系可用于FBG波长的解调。通过动态F-P腔与光纤光栅构建的温度测量实验系统,对不同温度下的液体进行实验测试,在35℃～80℃温度变化范围内验证了液体温度变化量与类余弦信号的位移量呈线性关系,其线性拟合度达99.5%。
A dynamic extrinsic Fabry-Perot (F-P) cavity wavelength demodulation method is proposed. By using the dynamic extrinsic F-P cavity modulated PZT FBG reflected by PZT, the modulation light intensity changes in a cosine-like manner with the cavity length of F-P cavity. After numerical simulation, when the PZT is driven by the sinusoidal voltage, the cosine signal output by the FP cavity produces the displacement of the signal curve due to the change of the FBG wavelength, and the displacement is linear with the variation of the FBG wavelength. This relationship can be used for the FBG Wavelength demodulation. Through the experimental system of temperature measurement built with dynamic FP cavity and fiber grating, the liquid at different temperatures was tested experimentally, and the temperature variation of liquid was linearly correlated with the displacement of cosine-like signal within the temperature range from 35 ℃ to 80 ℃ , The linearity of which reached 99.5%.