基于Rb-Xe体系核磁共振陀螺仪的Xe极化场测量方法  

Xe Polarization Field Measurement Method of Nuclear Magnetic Resonance Gyroscope Based on Rb-Xe System

作　　者：王柯穆 孙兵锋 熊志强 邓敏 汪之国[1,2,3] 罗晖 WANG Kemu;SUN Bingfeng;XIONG Zhiqiang;DENG Min;WANG Zhiguo;LUO Hui(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073;Interdisciplinary Center of Quantum Information,National University of Defense Technology,Changsha 410073;Nanhu Laser Laboratory,National University of Defense Technology,Changsha 410073)

机构地区：[1]国防科技大学前沿交叉学科学院,长沙410073 [2]量子信息机理与技术湖南省重点实验室,长沙410073 [3]国防科技大学南湖之光实验室,长沙410073

出　　处：《飞控与探测》2024年第2期88-93,共6页Flight Control & Detection

基　　金：国家自然科学基金(61671458)。

摘　　要：核磁共振陀螺仪具有小体积、高精度、低功耗等优点,是未来高精度微小型陀螺的主要发展方向之一。原子气室内Xe核自旋的极化是衡量原子气室性能的一个重要参数,直接影响陀螺的角随机游走,因此准确快速地测量极化场有利于研制性能更优的原子气室。为了实现Rb-Xe体系的核磁共振陀螺仪快速、原位测量Xe的极化场,提出了利用Rb电子顺磁共振频移测量Xe极化场的方法。通过激励磁场翻转Xe极化场,推导了估算Xe极化场的简单公式。实验测量了在典型核磁共振陀螺仪装置中,10nT量级的Xe极化场,结果与理论计算相符。表明这种方法能够快速有效地在核磁共振陀螺仪原位测量Xe的极化场。Nuclear magnetic resonance gyroscope with small size,high precision,low power consumption and other significant advantages,is one of the main development directions of high-precision micro-miniature gyroscopes in the future.The polarization of the Xe nuclear spin in the atomic gas chamber is an important parameter to measure the performance of the atomic vapor cell,which directly affects the angular random travel of the gyroscope,and the accurate and rapid measurement of polarization is conducive to the development of better performance atomic vapor cell.In order to realize the rapid and in situ measurement of the polarization field of Xe in the nuclear magnetic resonance gyroscope(NMRG)of the Rb-Xe system,a method for measuring the polarization field of Xe by using the paramagnetic resonance frequency shift of Rb electrons is proposed.A simple formula for estimating the Xe polarization field is derived by exciting the magnetic field of Xe and flipping the Xe polarization field.The Xe polarization field on the order of 10nT is measured experimentally,and the results are consistent with the theoretical calculations.This method enables fast and efficient measurement of the polarization field of Xe in situ in NMRG.

关 键 词：Xe极化场 原位测量 电子顺磁共振 核磁共振陀螺仪 极化场旋转 

分 类 号：O562.5[理学—原子与分子物理]