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采用相位掩模法,利用紫外光在载氢普通掺锗单模石英光纤中制作出光纤布拉格光栅(FBG)。同时,将反射率为17dB的光栅FBG1和反射率为41dB的光栅FBG2置于30～1000℃的高温炉内进行温度特性比较实验。在30～870℃范围内FBG1和FBG2两者中心波长随温度的变化趋势一致,且两个光栅反射波长都在870℃时消失,当温度继续升高到900℃时,仅有FBG2再次出现反射率为1dB的反射峰。对经过高温处理后的FBG2再次进行30～1000℃温度测量实验,温度灵敏度为0.02nm/℃,线性度为0.999。实验结果表明,对于具有高反射率的FBG进行高温热处理后,其可以在30～1000℃的温度范围内进行传感测量,且中心波长随温度变化呈良好的线性关系。利用该方法可以制作出低成本的可用于高温环境测量的FBG温度传感器。
A fiber Bragg grating (FBG) was fabricated by phase mask method using ultraviolet light in a common-germanium-doped single-mode quartz fiber carrying hydrogen. At the same time, the grating FBG1 with reflectance of 17dB and the grating FBG2 with reflectance of 41dB were placed in a high temperature furnace at 30 ~ 1000 ℃ for comparison of temperature characteristics. In the range of 30 ~ 870 ℃, the center wavelength of FBG1 and FBG2 have the same trend with temperature, and the reflection wavelengths of both gratings disappear at 870 ℃. When the temperature continues to rise to 900 ℃, only FBG2 reappears Reflection peak at 1 dB. FBG2 after high temperature treatment again 30 ~ 1000 ℃ temperature measurement experiment, the temperature sensitivity of 0.02nm / ℃, linearity of 0.999. The experimental results show that FBG with high reflectivity can be measured in the temperature range of 30 ~ 1000 ℃ after high temperature heat treatment, and the central wavelength shows a good linear relationship with temperature. The method can be used to produce a low cost FBG temperature sensor that can be used for high temperature environment measurement.