基于光谱吸收的碱金属气室温度梯度测量方法  

Temperature Gradient Measurement Method for Alkali Metal Cell Based on Spectral Absorption

作　　者：阮家森 段利红[1,2] 全伟 Ruan Jiasen;Duan Lihong;Quan Wei(School of Instrumentation and Optoelectronic Engineering,Beihang University,Beijing 100191,China;Hangzhou Innovation Institute(Yuhang),Beihang University,Hangzhou 310023,Zhejiang,China)

机构地区：[1]北京航空航天大学仪器科学与光电工程学院,北京100191 [2]北京航空航天大学杭州创新研究院(余杭),浙江杭州310023

出　　处：《中国激光》2022年第19期50-55,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(62003024,61721091,61773043)。

摘　　要：无自旋交换弛豫(SERF)原子惯性测量仪表因具有超高的理论精度和易于集成等优势,成为超高精度惯性测量仪表的重要发展方向。均匀且稳定的温度场是SERF惯性测量仪表实现超高精度测量的重要基础,提出了一种基于光谱吸收的碱金属气室全域温度梯度测量方法,通过在线获取气室不同位置激光入射前后的强度,根据光强比与温度的函数关系可获得气室内部相应位置的温度信息。较为全面地分析了光谱吸收法实现在线碱金属气室温度测量的可行性以及线偏振检测光频率对测温结果的影响,并通过有限元仿真与实验测试结果的对比,验证了所提方法的有效性。所提温度梯度测量方法是基于仪表原有设备实现的,不引入额外干扰,简单可靠且可操作性强。此方法的提出为SERF惯性测量仪表的加热系统设计与性能提升提供了重要的技术支撑。Objective Spin exchange relaxation free(SERF)atomic inertial measurement instruments have become important in paving the direction for the potential development of ultra-high-precision inertial measurement instruments by virtue of their ultra-high theoretical accuracy and easy integration.The realization of the SERF state requires a stable and uniform atomic density,which is closely related to temperature.Therefore,it is necessary to accurately measure the temperature and its gradient inside a cell.Among the various existing methods for temperature measurement,such as the platinum resistance method,the fiber grating method,the technique of infrared temperature measurement,and the spectral absorption method,only the last one can accurately measure the temperature inside the cell.However,all existing research on the spectral absorption method focuses on the accuracy of temperature measurement and the analysis of influencing factors.Thus,relevant research on the temperature gradient that exists inside a cell is lacking.Therefore,in this study,the spectral absorption method is proposed to measure the temperature field inside the alkali metal cell of the serf inertial measurement system.A longitudinal temperature gradient is obtained inside the cell by the continuous control of the laser orientation in the incident chamber.This method can accurately evaluate the cell temperature and the temperature gradient of high-precision quantum sensors.It provides important technical support for optimizing the design of electric heating without a magnetic system or an oven structure.Methods In this study,the spectroscopic absorption is used to measure the temperature inside a cell.First,the relationship between the temperature and the ratio of the intensity of linearly polarized light before and after passing through the gas cell is theoretically analyzed.Simultaneously,the influence of the frequency of the linearly polarized light on the accuracy of temperature measurement is also analyzed,and the linearly polarized light freque

关 键 词：测量 光谱吸收法 温度测量 温度梯度 无自旋交换弛豫 

分 类 号：O436[机械工程—光学工程]