基于超弱光纤光栅的LAMOST内部温度监测方法  

Internal space temperature monitoring method for LAMOST based on ultra-weak fiber grating

作　　者：罗志会[1] 张宇[1] 张勇[2,3] 郑胜[1] 曾曙光[1] 杨霄雪[1] LUO Zhihui;ZHANG Yu;ZHANG Yong;ZHENG Sheng;ZENG Shuguang;YANG Xiaoxue(College of Science,China Three Gorges University,Yichang 443002,China;National Astronomical Observatories/Nanjing Institute of Astronomical Optics&Technology,Chinese Academy of Sciences,Nanjing 210042,China;Key Laboratory of Chinese Academy of Sciences for Astronomical Optics&Technology,Nanjing Institute of Astronomical Optics&Technology,Nanjing 210042,China)

机构地区：[1]三峡大学理学院,湖北宜昌443002 [2]中国科学院国家天文台南京天文光学技术研究所,江苏南京210042 [3]中国科学院天文光学技术重点实验室(南京天文光学技术研究所),江苏南京210042

出　　处：《传感器与微系统》2020年第12期10-13,共4页Transducer and Microsystem Technologies

基　　金：国家自然科学基金资助项目(U1731124);宜昌市自然科学基金资助项目(A18-302-A03)。

摘　　要：针对大天区面积多目标光纤光谱天文望远镜(LAMOST)观测过程中内部空间温度场扰动的问题,提出了一种基于超弱光纤光栅的空间温度监测方法。理论分析了单涂层超弱光纤光栅传感器的感温原理,设计了一种免应力的超弱光纤光栅感温光缆,对光缆的温度特性进行标定,灵敏度约为10.8 pm/℃,在-20~50℃范围内线性度优于0.9997。将23个间距1 m的铠装光栅光缆沿LAMOST的M B反射镜及廊道布设,实时监测内部温度的变化,监测结果反映了M B反射镜前温度梯度的变化过程,以及观测行为及外部环境对镜筒温度分布的影响,为分析大型光学望远镜内部的温度场提供了参考。In order to solve the problem of internal space temperature field disturbance during observation process of LAMOST telescope,a space temperature monitoring method based on ultra-weak fiber Bragg grating(UWFBG)is proposed.The temperature sensing principle of the single coating layer UWFBG sensors is theoretically analyzed.A kind of stress-free UWFBG temperature sensing cable is designed,and its temperature characteristics are calibrated.The temperature sensitivity is about 10.8 pm/℃,and the linearity is prior to 0.9997 in the range of-20~50℃.23 armored UWFBG cables with a spacing of 1 m are laid along the M B mirror and the corridor of LAMOST to monitor internal temperature change in real time.Results show the evolution process of space temperature gradient in the M B mirror and the corridor,and influence of observation behavior and external environment on temperature distribution.It provides a reference for analyzing on temperature field inside large optical telescope.

关 键 词：超弱光纤光栅 温度传感器 灵敏度 线性度 温度梯度 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TN29[自动化与计算机技术—控制科学与工程]