CN110763219A - Closed-loop magnetic resonance method of nuclear magnetic resonance gyroscope - Google Patents

Closed-loop magnetic resonance method of nuclear magnetic resonance gyroscope Download PDF

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CN110763219A
CN110763219A CN201911126725.4A CN201911126725A CN110763219A CN 110763219 A CN110763219 A CN 110763219A CN 201911126725 A CN201911126725 A CN 201911126725A CN 110763219 A CN110763219 A CN 110763219A
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closed
loop
magnetic field
magnetic resonance
resonance
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CN110763219B (en
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汪之国
罗晖
张燚
赵洪常
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National University of Defense Technology
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Abstract

The invention provides a closed-loop magnetic resonance method of a nuclear magnetic resonance gyroscope, which realizes phase closed loop by using a self-feedback method and obtains a closed-loop excitation magnetic field with stable amplitude by using an amplification amplitude limiting and filtering method. The method comprises the steps of realizing phase closed loop by adopting a self-feedback method of a spinning precession magnetic moment signal; the amplitude closed loop of the excitation magnetic field is realized by using an amplification amplitude limiting and filtering method; and the phase shifter is utilized to adjust the closed-loop phase to realize accurate closed-loop magnetic resonance. Compared with a phase-locked loop method, the phase-locked loop method has the advantages of simple structure, less required components, large bandwidth, quick response, stable amplitude, good zero bias stability and better application prospect.

Description

一种核磁共振陀螺闭环磁共振方法A kind of nuclear magnetic resonance gyro closed-loop magnetic resonance method

技术领域technical field

本发明涉及基于原子自旋对角速度甚至自旋与其它物理场相互作用的高灵敏度测量，属于原子传感领域，特别涉及一种核磁共振陀螺闭环磁共振方法。The invention relates to high-sensitivity measurement based on atomic spin-to-angular velocity and even the interaction between spins and other physical fields, belongs to the field of atomic sensing, and in particular relates to a nuclear magnetic resonance gyro closed-loop magnetic resonance method.

背景技术Background technique

利用原子自旋（如碱金属电子自旋、惰性气体核自旋）可实现角速度等物理量的精确测量，如基于原子自旋的核磁共振陀螺兼有小体积、高精度等优点，已成为当前惯性技术领域的一个重要研究方向。The use of atomic spins (such as alkali metal electron spins, noble gas nuclear spins) can achieve accurate measurement of physical quantities such as angular velocity. For example, nuclear magnetic resonance gyroscopes based on atomic spins have the advantages of small size and high precision. An important research direction in the field of technology.

为了使核磁共振陀螺持续测量角速度，核磁共振陀螺需要采用闭环磁共振系统维持核自旋的进动。常见的闭环磁共振系统采用锁相环实现，具有频率分辨率高、激励磁场振幅稳定等优点，但其响应速度和带宽较小。另一种常用的闭环磁共振系统采用自激振荡实现，具有响应快、带宽大等优点，但其振幅稳定性差，而振幅的变化会影响核磁共振陀螺的零偏稳定性。In order to continuously measure the angular velocity of the NMR gyroscope, the NMR gyroscope needs to use a closed-loop magnetic resonance system to maintain the precession of the nuclear spin. Common closed-loop magnetic resonance systems are implemented by phase-locked loops, which have the advantages of high frequency resolution and stable excitation magnetic field amplitude, but their response speed and bandwidth are small. Another commonly used closed-loop magnetic resonance system is realized by self-excited oscillation, which has the advantages of fast response and large bandwidth, but its amplitude stability is poor, and the change of amplitude will affect the zero-bias stability of the NMR gyroscope.

发明内容SUMMARY OF THE INVENTION

本发明提出一种核磁共振陀螺闭环磁共振方法，它利用与自激类似的自反馈方法实现相位闭环，同时利用放大限幅与滤波的方法获得振幅稳定的闭环激励磁场。The invention provides a nuclear magnetic resonance gyro closed-loop magnetic resonance method, which uses a self-feedback method similar to self-excitation to realize phase closed-loop, and uses amplification, amplitude limiting and filtering to obtain a closed-loop excitation magnetic field with stable amplitude.

本发明的技术方案是：一种核磁共振陀螺闭环磁共振方法，具体内容为：The technical scheme of the present invention is: a nuclear magnetic resonance gyro closed-loop magnetic resonance method, the specific content is:

1、采用自旋进动磁矩信号的自反馈方法实现相位闭环；1. The self-feedback method of the spin precession magnetic moment signal is used to realize the phase closed loop;

2、利用放大限幅与滤波的方法实现激励磁场的振幅闭环；2. Use the method of amplification, limiting and filtering to realize the amplitude closed loop of the excitation magnetic field;

3、利用移相器调整闭环相位实现准确的闭环磁共振。3. Use the phase shifter to adjust the closed-loop phase to achieve accurate closed-loop magnetic resonance.

在一个密闭玻璃气室中，装填有过量碱金属（Rb或Cs中的至少一种）、惰性气体（3He、21Ne、83Kr、129Xe和131Xe中的一种或多种），有时还包括氮气、氢气等气体。将玻璃气室加热到合适温度（50℃-200℃范围内）使碱金属成为蒸气，然后利用与碱金属原子D1线共振的圆偏振激光使碱金属电子自旋产生极化。圆偏振激光由激光器产生，通过第二偏振器Ⅱ（3）、1/4波片（9）、后成为圆偏振激光。加热器（11）用来使玻璃气室（15）维持在合适温度从而使碱金属保持密度足够的气态。碱金属原子与惰性气体原子不停发生碰撞，通过自旋交换极化作用，惰性气体核自旋也产生极化。在z向通过第一线圈（14）施加磁场

Figure DEST_PATH_IMAGE002
，其大小通常在1μT-50μT之间。激光器（4）输出激光与碱金属原子D1线近共振（共振峰±20GHz），经过第一偏振器Ⅰ（2）后成为线偏振光，经反射后沿x方向通过玻璃气室（15），然后再反射到偏振分光器（6）上。从偏振分光器（6）透射的激光被平衡光电探测器（7）接收并转换为电信号。偏振分光器（6）的方位最好调整到分光输出的光强相等。平衡光电探测器（7）输出的电信号送入到信号处理系统（8），并经过处理后产生稳定磁场驱动信号和闭环共振磁场驱动信号。稳定磁场驱动信号经第一磁场驱动电路（10）后转换为电流，输入到第一线圈（14）产生稳定磁场。闭环共振磁场驱动信号经第二磁场驱动电路（12）后转换为电流，输入第二线圈（13）产生闭环共振磁场。闭环共振磁场的作用是产生磁场
Figure DEST_PATH_IMAGE004
，其频率为
Figure DEST_PATH_IMAGE006
，这里
Figure DEST_PATH_IMAGE008
为惰性气体的旋磁比，
Figure DEST_PATH_IMAGE010
为载体角速度。如果核磁共振陀螺采用
Figure DEST_PATH_IMAGE012
(
Figure 100002_DEST_PATH_IMAGE014
)种惰性气体核自旋作为工作气体，应在x方向施加
Figure DEST_PATH_IMAGE012A
个频率的交变磁场，且满足
Figure DEST_PATH_IMAGE017
，
Figure DEST_PATH_IMAGE019
。In a closed glass gas cell, filled with excess alkali metal (at least one of Rb or Cs), inert gas (one or more of 3He, 21Ne, 83Kr, 129Xe and 131Xe), and sometimes nitrogen, Gases such as hydrogen. The glass cell is heated to a suitable temperature (in the range of 50°C-200°C) to make the alkali metal vapor, and then the electron spin of the alkali metal is polarized by a circularly polarized laser that resonates with the D1 line of the alkali metal atom. The circularly polarized laser light is generated by the laser, passes through the second polarizer II (3) and the 1/4 wave plate (9), and then becomes circularly polarized laser light. The heater (11) is used to maintain the glass gas chamber (15) at a suitable temperature to keep the alkali metal in a gaseous state of sufficient density. Alkali metal atoms and noble gas atoms collide continuously, and through spin exchange polarization, the nuclear spins of noble gas are also polarized. A magnetic field is applied in the z direction through the first coil (14)
Figure DEST_PATH_IMAGE002
, and its size is usually between 1 μT-50 μT. The output laser light from the laser (4) is in close resonance with the alkali metal atom D1 line (resonant peak ±20GHz), and becomes linearly polarized light after passing through the first polarizer I (2). It is then reflected to the polarizing beam splitter (6). The laser light transmitted from the polarizing beam splitter (6) is received by a balanced photodetector (7) and converted into an electrical signal. The orientation of the polarizing beam splitter (6) is preferably adjusted so that the light intensity of the splitting output is equal. The electrical signal output by the balanced photodetector (7) is sent to the signal processing system (8), and after being processed, a stable magnetic field driving signal and a closed-loop resonance magnetic field driving signal are generated. The stable magnetic field drive signal is converted into a current by the first magnetic field drive circuit (10), and is input to the first coil (14) to generate a stable magnetic field. The closed-loop resonant magnetic field drive signal is converted into a current through the second magnetic field drive circuit (12), and is input to the second coil (13) to generate a closed-loop resonant magnetic field. The role of the closed-loop resonant magnetic field is to generate a magnetic field
Figure DEST_PATH_IMAGE004
, whose frequency is
Figure DEST_PATH_IMAGE006
,here
Figure DEST_PATH_IMAGE008
is the gyromagnetic ratio of the noble gas,
Figure DEST_PATH_IMAGE010
is the angular velocity of the carrier. If the NMR gyro adopts
Figure DEST_PATH_IMAGE012
(
Figure 100002_DEST_PATH_IMAGE014
) kind of noble gas nuclear spin as working gas, should be applied in the x direction
Figure DEST_PATH_IMAGE012A
frequency alternating magnetic field, and satisfy
Figure DEST_PATH_IMAGE017
,
Figure DEST_PATH_IMAGE019
.

磁屏蔽（1）的作用是衰减外界磁场，使玻璃气室中的自旋处于比较稳定的磁场环境中。The function of the magnetic shield (1) is to attenuate the external magnetic field, so that the spins in the glass gas chamber are in a relatively stable magnetic field environment.

本发明与锁相环方法相比，其结构简单、所需元器件少带宽大响应快，与自激方法相比，其振幅稳定，零偏稳定性好，具有较好的应用前景。Compared with the phase-locked loop method, the invention has the advantages of simple structure, few components required, large bandwidth, large bandwidth, and fast response.

附图说明Description of drawings

图1为核磁共振陀螺构成图，Fig. 1 is the structure diagram of nuclear magnetic resonance gyroscope,

图2为反馈系统框图。Figure 2 is a block diagram of the feedback system.

具体实施方案specific implementation

下面结合图1对具体实施方式进行详细说明。The specific embodiment will be described in detail below with reference to FIG. 1 .

在一个密闭玻璃气室（15）中，装填有过量碱金属（Rb或Cs中的至少一种）、惰性气体（3He、21Ne、83Kr、129Xe和131Xe中的一种或多种），有时还包括氮气、氢气等气体。将玻璃气室（15）加热到合适温度（50℃-200℃范围内）使碱金属成为蒸气，然后利用与碱金属原子D1线共振的圆偏振激光使碱金属电子自旋产生极化。圆偏振激光由激光器（5）产生，通过第二偏振器（3）、1/4波片（9）、后成为圆偏振激光。加热器（11）用来使玻璃气室（15）维持在合适温度从而使碱金属保持密度足够的气态。碱金属原子与惰性气体原子不停发生碰撞，通过自旋交换极化作用，惰性气体核自旋也产生极化。在z向通过第一线圈（14）施加磁场

Figure DEST_PATH_IMAGE002A
，其大小通常在1μT-50μT之间。激光器（4）输出激光与碱金属原子D1线近共振（共振峰±20GHz），经过第一偏振器（2）后成为线偏振光，经反射后沿x方向通过玻璃气室（15），然后再反射到偏振分光器（6）上。从偏振分光器（6）透射的激光被平衡光电探测器（7）接收并转换为电信号。偏振分光器（6）的方位最好调整到分光输出的光强相等。图中磁屏蔽（1）的作用是衰减外界磁场，使玻璃气室中的自旋处于比较稳定的磁场环境中。平衡光电探测器（7）输出的电信号送入到信号处理系统（8），并经过处理后产生稳定磁场驱动信号和闭环共振磁场驱动信号。稳定磁场驱动信号经第一磁场驱动电路（10）后转换为电流，输入到第一线圈（14）产生稳定磁场。闭环共振磁场驱动信号经第二磁场驱动电路（12）后转换为电流，输入第二线圈（13）产生闭环共振磁场。闭环共振磁场的作用是产生磁场，其频率为
Figure DEST_PATH_IMAGE006A
，这里
Figure DEST_PATH_IMAGE008A
为惰性气体的旋磁比，
Figure DEST_PATH_IMAGE010A
为载体角速度。如果核磁共振陀螺采用
Figure DEST_PATH_IMAGE012AA
(
Figure DEST_PATH_IMAGE014A
)种惰性气体核自旋作为工作气体，应在x方向施加个频率的交变磁场，且满足
Figure DEST_PATH_IMAGE017A
，
Figure DEST_PATH_IMAGE019A
。In a closed glass gas chamber (15), filled with excess alkali metal (at least one of Rb or Cs), inert gas (one or more of 3He, 21Ne, 83Kr, 129Xe and 131Xe), and sometimes Including nitrogen, hydrogen and other gases. The glass cell (15) is heated to a suitable temperature (in the range of 50°C-200°C) to make the alkali metal vapor, and then the electron spin of the alkali metal is polarized by a circularly polarized laser that resonates with the D1 line of the alkali metal atom. The circularly polarized laser light is generated by the laser (5), passes through the second polarizer (3) and the 1/4 wave plate (9), and then becomes the circularly polarized laser light. The heater (11) is used to maintain the glass gas chamber (15) at a suitable temperature to keep the alkali metal in a gaseous state of sufficient density. Alkali metal atoms and noble gas atoms collide continuously, and through spin exchange polarization, the nuclear spins of noble gas are also polarized. A magnetic field is applied in the z direction through the first coil (14)
Figure DEST_PATH_IMAGE002A
, and its size is usually between 1 μT-50 μT. The output laser light from the laser (4) closely resonates with the alkali metal atom D1 line (resonant peak ±20 GHz), and after passing through the first polarizer (2), it becomes linearly polarized light, and after being reflected, it passes through the glass gas chamber (15) along the x direction, and then It is then reflected to the polarizing beam splitter (6). The laser light transmitted from the polarizing beam splitter (6) is received by a balanced photodetector (7) and converted into an electrical signal. The orientation of the polarizing beam splitter (6) is preferably adjusted so that the light intensity of the splitting output is equal. The function of the magnetic shield (1) in the figure is to attenuate the external magnetic field, so that the spins in the glass gas cell are in a relatively stable magnetic field environment. The electrical signal output by the balanced photodetector (7) is sent to the signal processing system (8), and after being processed, a stable magnetic field driving signal and a closed-loop resonance magnetic field driving signal are generated. The stable magnetic field drive signal is converted into a current by the first magnetic field drive circuit (10), and is input to the first coil (14) to generate a stable magnetic field. The closed-loop resonant magnetic field drive signal is converted into a current through the second magnetic field drive circuit (12), and is input to the second coil (13) to generate a closed-loop resonant magnetic field. The role of the closed-loop resonant magnetic field is to generate a magnetic field , whose frequency is
Figure DEST_PATH_IMAGE006A
,here
Figure DEST_PATH_IMAGE008A
is the gyromagnetic ratio of the noble gas,
Figure DEST_PATH_IMAGE010A
is the angular velocity of the carrier. If the NMR gyro adopts
Figure DEST_PATH_IMAGE012AA
(
Figure DEST_PATH_IMAGE014A
) kind of noble gas nuclear spin as working gas, should be applied in the x direction frequency alternating magnetic field, and satisfy
Figure DEST_PATH_IMAGE017A
,
Figure DEST_PATH_IMAGE019A
.

我们以一种惰性气体核自旋的闭环磁共振为例介绍闭环共振磁场的产生原理。为了使核自旋维持磁共振，需要采用反馈系统对核自旋系综在y向产生的磁场分量

Figure DEST_PATH_IMAGE031
进行探测、放大、移相、电压-电流转换，最后送入到磁场线圈产生交变磁场。We take the closed-loop magnetic resonance of a noble gas nuclear spin as an example to introduce the generation principle of the closed-loop resonance magnetic field. In order to maintain the magnetic resonance of the nuclear spins, it is necessary to use a feedback system for the magnetic field components generated in the y-direction of the nuclear spin ensemble.
Figure DEST_PATH_IMAGE031
Perform detection, amplification, phase shifting, voltage-current conversion, and finally send it to the magnetic field coil to generate an alternating magnetic field .

图2给出了信号处理系统（8）的一种具体实施方式。模数转换器（20）将平衡光电探测器（7）输出的电压信号转换为数字信号，并给锁相放大器（21）。经过锁相放大器（21）处理后，得到玻璃气室中核自旋产生的磁场信号，这里为磁场振幅，

Figure DEST_PATH_IMAGE038
为相位，为角频率。利用限幅器（22）对
Figure DEST_PATH_IMAGE034A
进行限幅，输出信号成为
Figure DEST_PATH_IMAGE043
，这里为限幅器（22）设定幅度，表示方波函数，
Figure DEST_PATH_IMAGE049
为限幅器（22）引入的相移。限幅器可采用数字程序（如Labview程序）实现，通过对
Figure DEST_PATH_IMAGE034AA
的振幅进行判断，当
Figure DEST_PATH_IMAGE052
时输出
Figure DEST_PATH_IMAGE045A
，反之输出
Figure DEST_PATH_IMAGE055
。限幅器（22）的输出送入到移相器（23），得到
Figure DEST_PATH_IMAGE057
，这里
Figure DEST_PATH_IMAGE059
为移相器导致的相移，然后再输入到滤波器（24）。移相器（23）可采用数字程序实现，通过一个高频时钟对限幅器的输出以频率Fs进行采样，然后经过寄存器延迟N个周期，则可延迟N/（Fs）时间，等效为相位延迟。滤波器（24）可以为低通滤波器，截止频率设置为频率为
Figure DEST_PATH_IMAGE040A
的成分通过，频率大于
Figure DEST_PATH_IMAGE062
的成分截止。由于方波可以分解为
Figure DEST_PATH_IMAGE040AA
奇次谐波的叠加，通过滤波器后信号可以表示为
Figure DEST_PATH_IMAGE065
，
Figure DEST_PATH_IMAGE067
为滤波器引入的相移。移相器（23）的相位调整到
Figure DEST_PATH_IMAGE069
，
Figure DEST_PATH_IMAGE071
究竟是+还是-，根据核自旋的旋磁比来定。将滤波器（24）的输出连接到数模转换器（25），产生模拟电压信号，它输入到第二磁场驱动电路（12），驱动第二线圈（13）产生闭环共振磁场，这时核自旋系统可维持闭环磁共振。Figure 2 shows a specific implementation of the signal processing system (8). The analog-to-digital converter (20) converts the voltage signal output by the balanced photodetector (7) into a digital signal, and sends it to the lock-in amplifier (21). After being processed by the lock-in amplifier (21), the magnetic field signal generated by the nuclear spins in the glass gas chamber is obtained ,here is the magnetic field amplitude,
Figure DEST_PATH_IMAGE038
is the phase, is the angular frequency. Use the limiter (22) to
Figure DEST_PATH_IMAGE034A
clipping, the output signal becomes
Figure DEST_PATH_IMAGE043
,here Set the amplitude for the limiter (22), represents a square wave function,
Figure DEST_PATH_IMAGE049
Phase shift introduced for limiter (22). The limiter can be implemented with a digital program (such as the Labview program) by adjusting the
Figure DEST_PATH_IMAGE034AA
The amplitude is judged when
Figure DEST_PATH_IMAGE052
output
Figure DEST_PATH_IMAGE045A
, otherwise output
Figure DEST_PATH_IMAGE055
. The output of the limiter (22) is fed to the phase shifter (23), resulting in
Figure DEST_PATH_IMAGE057
,here
Figure DEST_PATH_IMAGE059
The phase shift caused by the phase shifter is then input to the filter (24). The phase shifter (23) can be realized by a digital program. The output of the limiter is sampled at the frequency Fs by a high-frequency clock, and then delayed by N cycles through the register, it can be delayed by N/(Fs) time, which is equivalent to phase delay. The filter (24) can be a low pass filter, the cutoff frequency is set to a frequency of
Figure DEST_PATH_IMAGE040A
The components pass through, the frequency is greater than
Figure DEST_PATH_IMAGE062
ingredients cut-off. Since the square wave can be decomposed into
Figure DEST_PATH_IMAGE040AA
The superposition of odd harmonics, after passing through the filter, the signal can be expressed as
Figure DEST_PATH_IMAGE065
,
Figure DEST_PATH_IMAGE067
Phase shift introduced for the filter. The phase shifter (23) adjusts the phase to
Figure DEST_PATH_IMAGE069
,
Figure DEST_PATH_IMAGE071
Whether it is + or - depends on the gyromagnetic ratio of the nuclear spin. The output of the filter (24) is connected to the digital-to-analog converter (25) to generate an analog voltage signal, which is input to the second magnetic field drive circuit (12) to drive the second coil (13) to generate a closed-loop resonant magnetic field. The spin system maintains closed-loop magnetic resonance.

为了提高抗噪声能力，限幅器（22）可采用迟滞比较器实现。滤波器（24）可以为带通滤波器，截止频率设置为频率为

Figure DEST_PATH_IMAGE040AAA
的成分通过，频率大于
Figure DEST_PATH_IMAGE062A
或小于1Hz的成分截止。信号处理系统（8）还可采用单片机或DSP或FPGA实现，也可采用模拟电路实现。In order to improve the noise immunity, the limiter (22) can be implemented with a hysteresis comparator. The filter (24) can be a bandpass filter with the cutoff frequency set to a frequency of
Figure DEST_PATH_IMAGE040AAA
The components pass through, the frequency is greater than
Figure DEST_PATH_IMAGE062A
or component cutoff less than 1Hz. The signal processing system (8) can also be implemented by a single chip microcomputer, a DSP or an FPGA, and can also be implemented by an analog circuit.

Claims (8)

1. A closed-loop magnetic resonance method of a nuclear magnetic resonance gyroscope is characterized in that a self-feedback method is used for realizing phase closed loop, and a closed-loop excitation magnetic field with stable amplitude is obtained by using an amplification amplitude limiting and filtering method, and the method comprises the following steps: (1) a self-feedback method of a spinning precession magnetic moment signal is adopted to realize phase closed loop; (2) the amplitude closed loop of the excitation magnetic field is realized by using an amplification amplitude limiting and filtering method; (3) adjusting the closed-loop phase by using a phase shifter to realize closed-loop magnetic resonance;
the method comprises the following steps: filling alkali metal and inert gas in a closed glass gas chamber, heating the glass gas chamber until the alkali metal becomes steam, and then utilizing circular polarization laser in linear resonance with alkali metal atoms D1 to enable alkali metal electron spin to generate polarization;
the alkali metal atoms and the inert gas atoms collide ceaselessly, and the nuclear spin of the inert gas also generates polarization through the spin exchange polarization effect;
applying a magnetic field in the z-direction by means of a first coil (14)
Figure 138348DEST_PATH_IMAGE002
The laser output by the laser (4) is in line resonance with alkali metal atoms D1, becomes linearly polarized light after passing through the first polarizer I (2), passes through the glass air chamber (15) along the x direction after being reflected, and then is reflected to the polarization beam splitter (6);
the laser transmitted from the polarization beam splitter (6) is received by a balanced photoelectric detector (7) and converted into an electric signal;
the electric signal output by the balanced photoelectric detector (7) is sent to a signal processing system (8) and processed to generate a stable magnetic field driving signal and a closed-loop resonance magnetic field driving signal;
the stable magnetic field driving signal is converted into current after passing through a first magnetic field driving circuit (10) and is input into a first coil (14) to generate a stable magnetic field; the closed-loop resonance magnetic field driving signal is converted into current after passing through a second magnetic field driving circuit (12) and is input into a second coil (13) to generate a closed-loop resonance magnetic field.
2. The closed-loop magnetic resonance method for the nuclear magnetic resonance gyroscope of claim 1, wherein the closed-loop resonance magnetic field is used for generating a magnetic field
Figure 55488DEST_PATH_IMAGE004
At a frequency of，
Figure 295681DEST_PATH_IMAGE008
Is the gyromagnetic ratio of the inert gas,is the angular velocity of the carrier.
3. The closed-loop magnetic resonance method for the nuclear magnetic resonance gyroscope according to claim 1, characterized in that the circularly polarized laser is generated by a laser and passes through a second polarizer II (3) and an 1/4 wave plate (9) to become the circularly polarized laser.
4. A closed-loop mri method as claimed in claim 1, characterized in that said heater (11) is adapted to maintain the glass gas chamber (15) at a suitable temperature so that the alkali metal remains in a gas state of sufficient density.
5. A closed-loop mr method according to claim 1, characterized in that the first coil (14) applies a magnetic fieldIs between 1 muT and 50 muT.
6. A closed-loop mri method as claimed in claim 1, characterized in that the orientation of the polarizing beam splitter (6) is adjusted so that the light intensities of the split outputs are equal.
7. A closed-loop magnetic resonance method for a nuclear magnetic resonance gyroscope according to claims 1-6The method is characterized in that the nuclear magnetic resonance gyroscope adopts
Figure 57150DEST_PATH_IMAGE013
Nuclear spin of inert gas as working gas, and applying in x direction
Figure DEST_PATH_IMAGE014
An alternating magnetic field of one frequency and satisfy
Figure 386500DEST_PATH_IMAGE016
，
Figure 585400DEST_PATH_IMAGE018
，
Figure 316596DEST_PATH_IMAGE020
。
8. The closed-loop magnetic resonance method for a nuclear magnetic resonance gyroscope of claim 7, wherein the inert gas is one or more of 3He, 21Ne, 83Kr, 129Xe, and 131 Xe.
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