核磁共振陀螺高精度磁场驱动技术  

Nuclear magnetic resonance gyroscope high-precision magnetic field drive technology

作　　者：陆麒麟 杨丹 赵兴华[1,2] 周斌权 LU Qilin;YANG Dan;ZHAO Xinghua;ZHOU Binquan(School of Instrumentation and Optoelectronic Engineering,Beijing University of Aeronautics and Astronautics Beijing 100083,China;National Key Laboratory of Inertial Technology,Beijing University of Aeronautics and Astronautics,Beijing 100083,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,北京100083 [2]北京航空航天大学惯性技术国家级重点实验室,北京100083

出　　处：《北京航空航天大学学报》2018年第12期2595-2604,共10页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家自然科学基金(61627806);国家"863"计划(2014AA123401)~~

摘　　要：核磁共振陀螺(NMRG)是利用激光与核磁共振气室中的碱金属原子和惰性气体原子的相互作用使核子以拉莫尔频率进动,并通过磁场驱动技术对气室磁场实现闭环控制和对剩磁进行补偿来维持核子的共振状态,进而能够检测载体的角速度信息。磁场驱动技术作为磁场闭环控制的重要部分,直接影响核磁共振陀螺的磁场控制精度和稳定性。为了解决核磁共振陀螺磁场控制精度和稳定性不足的关键问题,采用交直流分离设计的压控电流源方案改善磁场驱动问题,基于噪声分析理论对电路进行建模和噪声分析,并通过实验验证对三轴线圈的横向磁场控制精度达±0. 046 2 n T,纵向磁场控制精度为±0. 003 1 nT,实验证明该技术方案具有较强的工程应用价值。The interaction of the lasers with the alkali metal atoms and inert atoms in the cell is used to maintain nucleon precessional motion in Larmor frequency,the magnetic field-driven technique is used to achieve closed-loop control of air chamber magnetic field,the resonance state of nucleon is kept by compensating the residual magnetism,and then the system angular rate can be sensed,which is the basic theory of nuclear magnetic resonance gyroscope( NMRG). Magnetic field drive technology,which is an important part of the closed-loop control of magnetic field,directly influences the precision and stability of NMRG. In order to solve the key technical problems of insufficient control accuracy and stability of NMRG magnetic field,a voltage-controlled current source of AC/DC separation design is studied to improve the control precision of the magnetic field. In addition,analysis and modeling of the field drive circuit noise based on noise analysis theory are carried out and the experiment is made for verification. The results show that the control precision of the transverse magnetic field of the 3-axis coil is ± 0. 046 2 n T and the control precision of longitudinal magnetic field is ± 0. 003 1 nT. The experiment proves that this technical solution has higher engineering application value.

关 键 词：核磁共振陀螺(NMRG) 磁场驱动控制 数字程控电流源 低噪声电路建 模与分析 三轴磁场线圈 

分 类 号：TM93[电气工程—电力电子与电力传动] TL622[核科学技术—核技术及应用]