基于暗态扫频法的Rb-Xe自旋交换体系弛豫时间测量方法  

Measurement method for relaxation time of Rb-Xe spin exchange system based on dark state sweeping method

作　　者：钱天予 郑锦韬 熊志强 罗晖[1] 汪之国[1] Qian Tianyu;Zheng Jintao;Xiong Zhiqiang;Luo Hui;Wang Zhiguo(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China;Huaguan Technology Co.,Ltd.,Changsha 410073,China)

机构地区：[1]国防科技大学前沿交叉学科学院,长沙410073 [2]华惯科技有限公司,长沙410073

出　　处：《仪器仪表学报》2023年第9期144-152,共9页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(12174446);湖南省杰出青年基金(2023JJ10050)项目资助。

摘　　要：在87Rb-129Xe自旋交换体系中,87Rb和129Xe弛豫时间的准确测量对于磁共振陀螺及磁力仪相关应用非常重要。针对该需求,分析了泵浦光与激励磁场对87Rb弛豫时间的影响以及暗态下的87Rb和129Xe自旋交换过程,并在理论分析基础上提出了暗态扫频测量方法。实现了对87Rb以及129Xe的纵向弛豫时间的测量。使用本方法测得了87Rb的横向弛豫时间和纵向弛豫时间分别为1.36和5.18 ms,129Xe的纵向弛豫时间为519 s,其拟合R2=0.9999,具有极高的拟合优度。相较于以往的测量方法,暗态扫频法可以彻底消除泵浦光造成的磁场梯度的影响,具有高准确度的优点且操作简便。研究对磁共振陀螺及磁力仪的性能分析与标定具有较高的参考价值。In the 87Rb-129Xe spin exchange system,the accurate measurement of the relaxation times of 87Rb and129Xe is crucial for applications related to nuclear magnetic resonance gyroscopes and magnetometers.In response to this requirement,the influences of pump light and excitation magnetic field on87Rbrelaxation time,as well as the spin exchange processes of 87Rb and 129Xe in the dark state,are analyzed.Based on theoretical analysis,a dark state sweep frequency measurement method is proposed.The measurement of longitudinal relaxation time of 87Rb and 129Xe is achieved.The transverse relaxation time and longitudinal relaxation time of 87Rb measured using this method are 1.36 and 5.18 ms,respectively.The longitudinal relaxation time of 129Xe is 519 s,whose R-squared is 0.9999 which has a very high goodness of fit.Compared with previous measurement methods,the dark state sweep method can completely eliminate the influence of magnetic field gradient caused by pump light,and has the advantages of high accuracy and easy operation.This article has high reference value for the performance analysis and calibration of nuclear magnetic resonance gyroscopes and magnetometers.

关 键 词：铷氙自旋交换体系 暗态扫频法 弛豫时间 磁场梯度 

分 类 号：TH74[机械工程—光学工程] TN249[机械工程—仪器科学与技术]