中文摘要：

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%。

英文摘要：

A method of demodulation wavelength with the dynamic extrinsic Fabry-Pérot（F-P） cavity is proposed.The reflected light of fiber Bragg grating（FBG） is modulated by the F-P cavity which is constructed of a piezoelectric ceramics（PZT）.By the theoretical analysis,the modulated intensity varies with the length of F-P cavity as cosine-like.When PZT has a vibration driven by a sine voltage,the cosine-like signal moves,and a linear relationship between the signal curve shift and FBG wavelength offset is numerically simulated,which can be applied to FBG wavelength of demodulation.Utilizing a temperature measurement system made up of the F-P cavity and a FBG,the liquid temperature measurement is carried out at different temperatures.Linear relationship between variation of the liquid temperature and the displacement of cosine-like signal is proved when the temperature changes from 35 ℃ to 80 ℃,and the linear fitting degree reaches to 99.5%.