核磁共振陀螺高精度磁场驱动技术

陆麒麟; 杨丹; 赵兴华; 周斌权

doi:10.13700/j.bh.1001-5965.2018.0137

核磁共振陀螺高精度磁场驱动技术

doi: 10.13700/j.bh.1001-5965.2018.0137

陆麒麟^{1, 2},
杨丹^{1, 2},
赵兴华^{1, 2},
周斌权^{1, 2, ,}

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

基金项目:

国家自然科学基金 61627806

国家"863"计划 2014AA123401

详细信息

作者简介:
陆麒麟男, 硕士研究生。主要研究方向:量子传感技术

周斌权男, 博士, 讲师。主要研究方向:原子陀螺仪技术

通讯作者:
周斌权, E-mail: bqzhou@buaa.edu.cn

中图分类号: TM93;TL62⁺2
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- 被引次数: 0
出版历程
- 收稿日期: 2018-03-16
- 录用日期: 2018-06-15
- 网络出版日期: 2018-12-20

Nuclear magnetic resonance gyroscope high-precision magnetic field drive technology

LU Qilin^{1, 2},
YANG Dan^{1, 2},
ZHAO Xinghua^{1, 2},
ZHOU Binquan^{1, 2
, ,}

1.
School of Instrumentation and Optoelectronic Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
2.
National Key Laboratory of Inertial Technology, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

Funds:

National Natural Science Foundation of China 61627806

National High-tech Research and Development Program of China 2014AA123401

More Information

Corresponding author: ZHOU Binquan, E-mail: bqzhou@buaa.edu.cn

摘要

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 nT，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。
- 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
Abstract:
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 nT 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.
- nuclear magnetic resonance gyroscope (NMRG) /
- magnetic field drive control /
- digital programmable current source /
- modeling and analysis of low noise circuits /
- 3-axis magnetic field coil

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图 1 磁场驱动电路结构框图

Figure 1. Structure diagram of magnetic field drive circuit

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图 2 数字控制装置原理框图

Figure 2. Principle diagram of digital control device

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图 3 直流压控电流源模型

Figure 3. Model of DC voltage-controlled current source

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图 4 交流V-I转换模型

Figure 4. Model of AC V-I transformation

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图 5 低噪声电源电路

Figure 5. Low noise power supply circuit

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图 6 直流压控电流源噪声模型

Figure 6. Noise model of DC voltage-controlled current source

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图 7 直流等效输出电流噪声功率谱

Figure 7. Current noise power spectrum of DC equivalent output

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图 8 直流输入输出特性曲线

Figure 8. DC input-output characteristic curve

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图 9 磁场驱动控制器实验电路

Figure 9. Experimental circuit of magnetic field drive controller

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图 10 三轴柔性线圈

Figure 10. Triaxial flexible coil

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图 11 直流电流漂移测试图

Figure 11. DC current drift test

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图 12 交直流负载输出曲线

Figure 12. Load output curves of AC & DC

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图 13 交流输出幅频特性曲线

Figure 13. AC output amplitude-frequency characteristic curves

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图 14 等效输出电流噪声

Figure 14. Equivalent output current noise

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表 1 直流电流输出分辨力

Table 1. DC current output resolution

直流幅值控制字	正直流电流/mA	负直流电流/mA
0000	0.001 816	0.001 992
0001	0.002 708	0.001 506
0002	0.003 464	0.000 856
0003	0.004 256	0.000 194
0004	0.005 038	-0.000 434
0005	0.005 828	-0.001 092
0006	0.006 574	-0.001 746
0007	0.007 346	-0.002 424
0008	0.008 094	-0.003 064
0009	0.008 862	-0.003 722
000A	0.009 624	-0.004 378
000B	0.010 404	-0.005 028
000C	0.011 168	-0.005 674
000D	0.011 930	-0.006 328
000E	0.012 712	-0.000 434
000F	0.013 464	-0.001 092

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表 2 直流电流输出精度

Table 2. DC current output accuracy

理论电流/mA	正实测电流/mA	负实测电流/mA
±0.01	0.010 052	-0.010 106
±0.02	0.019 991	-0.020 234
±0.03	0.029 906	-0.029 611
±3	3.000 17	-2.999 57
±4	4.000 53	-3.999 46
±5	5.000 28	-4.999 97
±16	16.002 7	-15.999 8
±17	17.002 2	-16.999 3
±18	18.002 1	-17.999 4

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表 3 主磁场精调直流电流输出精度

Table 3. Accurately DC current output accuracy of main magnetic field

理论电流/mA	(精调)实测电流/mA
0.005	0.004 999 6
0.006	0.006 001 9
0.007	0.006 998 7
0.008	0.008 004 3
0.01	0.010 005 6
0.02	0.020 003 7
0.03	0.029 997 9
0.04	0.040 003 2
0.05	0.050 008 7

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表 4 三轴线圈磁场控制精度

Table 4. Accuracy of magnetic field control of three-axis coil

线圈	线圈常数/ (nT·mA^-1)	电流精度/ mA	磁场精度/ nT
x轴	30.822 91	±0.001 5	±0.046 2
y轴	30.822 91	±0.001 5	±0.046 2
z轴	1 187.647 55	±0.002 6×10^-3	±0.003 1

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