光泵浦核磁共振陀螺灵敏度优化  

Parameter Optimization on Sensitivity in Optically Pumped NMRGs

作　　者：汪之国[1] 江奇渊 张燚 陈畅[1] 罗晖[1] WANG Zhi-guo;JIANG Qi-yuan;ZHANG Yi;CHEN Chang;LUO Hui(College of Advanced Interdisciplinary Studies,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

出　　处：《导航与控制》2022年第5期51-59,共9页Navigation and Control

基　　金：国家自然科学基金(编号:12174446,61671458)。

摘　　要：核磁共振陀螺(Nuclear Magnetic Resonance Gyroscope,NMRG)具有小体积、轻质化、低功耗等潜在优势,是当前惯性技术领域的热点研究方向之一。然而,目前其灵敏度与光学陀螺相比还有一定差距。为了分析核磁共振陀螺灵敏度(这里指角随机游走)的实际限制,基于Rb-Xe自旋交换光泵浦系统建立了相关模型。在此基础上,获得了NMRG灵敏度的影响因素,并推导了一个可以用来估计其实际灵敏度的公式。然后,分别以内腔体积8mm^(3)和1000mm^(3)的两个原子气室为例,研究了系统参数的影响,优化了NMRG的灵敏度。前者给出的理论灵敏度约为7.3×10^(-4)(°)/h^(1/2) ,而后者给出的理论灵敏度约为3.1×10^(-5)(°)/h^(1/2) ,表明NMRG具有很大的潜力。The nuclear magnetic resonance gyroscope(NMRG)has many potential advantages such as small size,light weight,low power consumption,and is one of the hot research directions in the field of inertial technology.However,there is still a certain gap between its sensitivity and optical gyroscope.In order to analyze the practical limitations to the sensitivity(angular random walk)of the NMRG,a model based on Rb-Xe spin exchange optical pumping system is built.With this model,the influence factors on the sensitivity of the NMRG are obtained and a formula is derived to estimate its practical sensitivity.Then,the influence of system parameters is studied and optimizations are implemented for two NMRGs with cell volume of 8mm3 and 1000mm3,respectively.The theoretical sensitivity given by the former is about 7.3×10^(-4)(°)/h^(1/2) ,and the theoretical sensitivity given by the latter is about 3.1×10^(-5)(°)/h^(1/2) ,showing great potential of the NMRG.

关 键 词：核磁共振陀螺 系统参数 角随机游走 优化 

分 类 号：V241.557[航空宇航科学与技术—飞行器设计]