分别以铜、铝、有机玻璃、聚四氟乙烯为实验衬底材料, 对采用片式粘敷封装技术的光纤布拉格光栅温度传感增敏特性进行了实验研究。研究结果表明, 当对两侧尾纤有涂覆层的光纤布拉格光栅进行封装时, 其温度灵敏系数分别是裸纤情况下的2.3倍、2.9倍、5.2倍、11.7倍。然而, 粘敷材料在较高温度时显著的热膨胀会引起光纤包层与涂覆层发生一定的脱离, 导致此时其实验结果重复性不甚理想。为了克服这种不利情况, 对尾纤无涂覆层的光纤布拉格光栅进行了封装测试。在测试温度范围内, 其反射波长随温度的变化始终呈现良好的线性关系, 其温度灵敏系数分别提高到了3倍、3.4倍、9.2倍、12.6倍, 测量结果重复性良好。研究结果为将来片式封装光纤布拉格光栅传感器的温度增敏特性的研究, 提供了必要有益的数据支持和参考。

The enhanced temperature sensitivities of Fiber Bragg Gratings(FBGs) slice-packaged with copper, aluminum, perspex and PTFE were studied experimentally. The results show that when the coated fiber tails on both sides of FBG are bonded on substrate materials, the temperature sensitivity coefficients are about 2.3 times, 2.9 times, 5.2 times, and 11.7 times that of a bare FBG, respectively. However, the measurement reproducibility of the results is unsatisfactory due to the fact that the thermal expansion of substrate materials at higher temperature will inevitably lead to a separation of fiber cladding from coating layer. For experimental optimization, the experiments under the uncoated tail of FBG are carried out based on the aforementioned four substrate materials. The reflection wavelengths have a good linear relationship with the temperature change within the measurement temperature range. The temperature sensitivity coefficients of FBGs are enhanced to 3 times, 3.4 times, 9.2 times, 12.6 times, respectively, and the results show a good measurement reproducibility. The research results provide necessary and useful data support and reference for the future research on the temperature sensitivity enhancement of slice-packaged fiber Bragg grating sensors.