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通过对柚子型微结构光纤Bragg光栅的多个反射峰的温度和应变传感特性进行的理论和实验研究,得出柚子型微结构光纤Bragg光栅的反射波长与温度呈二次关系,且理论和实验二者吻合较好;同时发现每个反射峰的温度灵敏度不同.理论分析柚子型微结构光纤Bragg光栅的反射波长与应变呈线性关系,实验得到了该种Bragg光栅的反射波长与应变的线性关系,实验结果与理论分析相吻合.由于微结构光纤光栅反射谱中多个峰对温度和应变等物理量敏感度不一致,这种Bragg光栅更适合应用到多参量传感领域.
Through the theoretical and experimental research on the temperature and strain sensing characteristics of several reflection peaks of grapefruit-type fiber Bragg gratings, the reflection wavelength of grapefruit-type fiber Bragg gratings is quadratic with temperature, and the theoretical and experimental results The experimental results agree well with each other, and the temperature sensitivity of each reflection peak is also found to be different.Recently, the reflection wavelength and the strain of the grapefruit-type microstructured fiber Bragg grating exhibit a linear relationship, and the linearity of the reflection wavelength and strain of the Bragg grating The experimental results are in good agreement with the theoretical analysis.Because the sensitivity of multiple peaks to the physical quantities such as temperature and strain is not consistent in the reflection spectra of microstructured FBG, this Bragg grating is more suitable for multi-parameter sensing.