光纤Bragg光栅液氦环境下温度传感特性的研究  

Study on temperature response of fiber Bragg grating at liquid helium temperature

作　　者：张红洁[1] 邓凡平[1] 肖剑[2] 黄国君[2] 王秋良[1] 

机构地区：[1]中国科学院应用超导重点实验室 [2]中国科学院力学研究所

出　　处：《光电子．激光》2008年第5期581-583,共3页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(50577063)

摘　　要：进行了液氦温度(4.2 K)到室温(298 K)温区内光纤Bragg光栅(FBG)温度传感性能的实验研究。重点分析了液氦温度(4.2 K)到液氮温度(77 K)FBG的温度传感特性。实验表明:FBG传感特性与温度相关。在50 K以下,温度响应基本没有变化;50 K-77 K,波长偏移量随温度上升变化不规律;150 K-298 K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FBG的温敏系数和线性度。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.

关 键 词：光纤布拉格光栅 液氦温度 温度传感 

分 类 号：TN253[电子电信—物理电子学]