不同封装光纤低温测温性能研究

基于拉曼散射的分布式光纤温度传感器由于具有抗电磁干扰、耐高压、可连续测温等优点,在超导电缆及相关超导电力装置中具有潜在应用场景.在超导电缆低温运行环境中,常规光纤封装材料耐低温性能差,其收缩变形会降低光纤测温性能甚至破坏光纤结构.本文对低温下不同封装光纤测温性能展开研究,选择四种光纤样品,在77～287 K温度区间内对其进行了稳态和动态温度测量实验,分析了低温下不同封装材料、结构和厚度等因素对光纤测温性能的影响,给出了适用于液氮低温测温的光纤封装材料和结构,实验验证了聚烯烃紧套光纤在时间和空间上连续测温的可行性.

Study on Temperatur eMeasurement Performance of Different Packaged Optical Fibers at Low Temperature

Raman scattering-based distributed optical fiber temperature sensor is expected to be used for super conducting cable cryogenic cooling process and temperature distribution monitoring along the line due to its advantages of anti-electro magnetic interference, high voltage resistance and continuous temperature measurement. However, in low temperature, low temperature resistant packaging material can reduce fiber temperature measurement performance and even damage fiber structure. In this paper, four different package doptical fibers were used as experimental samples for study on temperature measurement performance at low temperature. The effects of different packaging materials, structures and thicknesses on the temperature measurement performance of optical fiber at low temperature were analyzed. Low smoke zero halogen-polyolefin (LSZH-PO) tight-buffered optical fiber can be used for super conducting cable cryogenic cooling process and temperature distribution monitoring along the line, and the reliability of temperature measurement for LSZH-PO tight-buffered optical fiber was verified by experiment.