LUO Zhihui, ZHANG Yu, ZHANG Yong, et al. Internal space temperature monitoring method for LAMOST based on ultra-weak fiber grating[J]. 2020, (12): 10-13.
LUO Zhihui, ZHANG Yu, ZHANG Yong, et al. Internal space temperature monitoring method for LAMOST based on ultra-weak fiber grating[J]. 2020, (12): 10-13. DOI: 10.13873/J.1000-9787(2020)12-0010-04.
基于超弱光纤光栅的LAMOST内部温度监测方法
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0.999 7。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。
Abstract
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. 999 7 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 te
mperature change in real time. Results show the evolution process of space temperature gradient in the MBmirror 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.