中文摘要：

进行了液氦温度（4．2K）到室温（298K）温区内光纤Bragg光栅（FHG）温度传感性能的实验研究。重点分析了液氦温度（4．2K）到液氮温度（77K）FBG的温度传感特性。实验表明：FHG传感特性与温度相关。在50K以下，温度响应基本没有变化；50K-77K，波长偏移量随温度上升变化不规律；150K-298K传感特性近似成线性。对比裸光栅与涂敷光栅，涂敷光栅的温度灵敏度远大于裸光栅的温度灵敏度。选用外加热膨胀系数大的聚合物封装，可以显著提高FHG的温敏系数和线性度。

英文摘要：

The temperature response of fiber Bragg grating sensors has been monitored over a temperature range from 4.2 K to 298 K,especially the temperature sensing in liquid helium environment. It is found that the temperature sensitivity of FBG is dependent on temperature. A thermal response is measured to above 50 K. However, the changes are more complicated from 50 K to 77 tC The linear temperature response is found from 150 K to 298 K. Coating material with larger coefficient of thermal expansion can greatly improve the temperature sensing behavior of FBGs.