Nuclear magnetic resonance gyroscope pulse type angular rate measurement method and system
Patent Information
- Application Number
- CN202411976501.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-05-13
Smart Images
Figure CN119984226A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of quantum sensing technology, and in particular to a method and system for pulsed angular velocity measurement of a nuclear magnetic resonance gyroscope. Background Art
[0002] The NMR gyroscope, with its all-solid-state and micro-machining advantages, shows outstanding performance advantages in applications with strict volume requirements and high overload. At present, the nuclear spins in the NMR gyroscope are still in the mode of continuous excitation of the transverse magnetic field. The amplitude of the nuclear spin signal in this continuous excitation is affected by the transverse relaxation time, and if the transverse excitation magnetic field frequency is different from the nuclear spin resonance frequency, the forced vibration will also affect the gyroscope's ability to measure angular velocity. Therefore, there is a need for a method that can improve the nuclear spin signal amplitude under the existing gas chamber performance conditions and avoid the angular velocity measurement error caused by forced resonance. Summary of the invention
[0003] The present invention provides a method and system for pulsed angular velocity measurement of a nuclear magnetic resonance gyroscope, which can solve the technical problem in the prior art that if the frequency of the transverse excitation magnetic field is different from the nuclear spin resonance frequency, the forced vibration will also affect the gyroscope's ability to measure angular velocity.
[0004] According to one aspect of the present invention, a method for pulsed angular velocity measurement of a nuclear magnetic resonance gyroscope is provided, and the method for pulsed angular velocity measurement of a nuclear magnetic resonance gyroscope comprises: step one, before the control starts, the nuclear magnetic resonance gyroscope works normally and ensures that the nuclear spin has been completely polarized to the longitudinal direction, when the nuclear magnetic resonance gyroscope is in a measurable state, according to the set angular velocity output rate, the composed pulsed measurement sequence is completely measured according to the measurement process to obtain raw data; step two, according to the set angular velocity output rate and the flag bit of the pulse sequence signal, the raw data is segmented; step three, after removing the excitation signal from each segmented frame of raw data, the free relaxation segment signal is fitted to obtain the frequency when the inert gas nuclear spin relaxes freely from the transverse direction to the longitudinal direction, and the angular velocity is calculated according to the gyromagnetic ratio of different elements of the inert gas.
[0005] Furthermore, according to the set angular velocity output rate, the composed pulsed measurement sequence is subjected to a complete measurement of the angular velocity according to the measurement process, specifically including: applying a first shock magnetic field to the nuclear spins in the magnetic resonance chamber to completely excite the nuclear spins from the longitudinal direction to the transverse direction, and when the nuclear spin signal reaches a maximum value, performing angular velocity measurement in the nuclear spin free relaxation stage to complete the first cycle frequency measurement; applying a second shock magnetic field to the nuclear spins according to the intensity after the first measurement, and when the nuclear spin signal reaches a maximum value, performing angular velocity measurement in the nuclear spin free relaxation stage to complete the second cycle frequency measurement; applying a third shock magnetic field to the nuclear spins, and when the nuclear spin signal reaches a maximum value, performing angular velocity measurement in the nuclear spin free relaxation stage to complete the third cycle frequency measurement; repeating the above process, applying a fourth shock magnetic field, ..., Nth shock magnetic field to the nuclear spins in turn to complete the fourth cycle frequency measurement, ..., Nth cycle frequency measurement.
[0006] Furthermore, since the nuclear spin in the first cycle of pulse measurement is driven longitudinally to the maximum transverse signal, and except for the first cycle, the measurements in the remaining cycles are all made from the end point of the previous measurement cycle to make the nuclear spin reach the transverse maximum value again, the excitation signal of the first cycle is different from the excitation signals of the remaining cycles in amplitude or number of cycles.
[0007] Furthermore, obtaining a combined pulse measurement sequence specifically includes: determining the first period excitation signal or the remaining period excitation signals based on the criterion that the end excitation is the excitation signal with the largest nuclear spin signal amplitude, that is, the optimal excitation signal; optimizing the nuclear spin signal amplitude by adjusting the amplitude and width of the first period excitation signal according to the criterion of the first period excitation signal, when the nuclear spin signal amplitude is the largest, it means that the amplitude and width of the first period excitation signal reach the optimized value, thereby obtaining the first period measurement optimal excitation signal; optimizing the nuclear spin signal amplitude by adjusting the amplitude and width of the remaining period excitation signals according to the criterion of the remaining period excitation signals, when the nuclear spin signal amplitude is the largest, it means that the amplitude and width of the remaining period excitation signals reach the optimized value, thereby obtaining the remaining period measurement optimal excitation signals; combining the first period measurement optimal excitation signal and a plurality of remaining period excitation signals to obtain a combined pulse measurement sequence.
[0008] Furthermore, when the longitudinal laser polarization time exceeds the longitudinal relaxation time, the nuclear spin is considered to have been completely polarized to the longitudinal direction.
[0009] Furthermore, when the driving laser and the detection laser can work normally and the temperature of the atomic gas chamber reaches the set temperature, it is considered that the nuclear magnetic resonance gyroscope is in a measurable state.
[0010] According to another aspect of the present invention, a system for pulsed angular velocity measurement of a nuclear magnetic resonance gyroscope is provided. The system for pulsed angular velocity measurement of a nuclear magnetic resonance gyroscope uses the above-mentioned method for pulsed angular velocity measurement of a nuclear magnetic resonance gyroscope to measure angular velocity.
[0011] By applying the technical solution of the present invention, a method for pulsed angular velocity measurement of a nuclear magnetic resonance gyroscope is provided. The method applies an impact magnetic field to the nuclear spin in the magnetic resonance gas chamber to completely excite the nuclear spin from the longitudinal direction to the transverse direction, thereby improving the signal intensity of the nuclear spin. Then, the angular velocity is measured during the free relaxation phase of the nuclear spin, thereby avoiding the measurement error caused by the nuclear spin being in a non-resonant state due to forced vibration. The pulsed magnetic field is formed by adjusting the time interval between the applied impact magnetic fields to achieve the output rate requirement equivalent to that during continuous measurement. Therefore, compared with the prior art, the method for pulsed angular velocity measurement of a nuclear magnetic resonance gyroscope provided by the present invention can improve the amplitude of the nuclear spin signal and avoid the angular velocity measurement error caused by the forced resonance of the nuclear spin under the condition that the gas chamber performance remains unchanged. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the embodiments of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0013] Figure 1 A flow chart of a method for measuring angular velocity by pulsed nuclear magnetic resonance gyroscope provided according to a specific embodiment of the present invention is shown;
[0014] Figure 2 A schematic diagram of a measured excitation signal and a nuclear spin response signal provided according to a specific embodiment of the present invention is shown;
[0015] Figure 3 A timing diagram of angular rate measurement provided according to a specific embodiment of the present invention is shown. DETAILED DESCRIPTION
[0016] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0017] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0018] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.
[0019] like Figures 1 to 3As shown, according to a specific embodiment of the present invention, a method for pulsed angular velocity measurement of a nuclear magnetic resonance gyroscope is provided, and the method for pulsed angular velocity measurement of a nuclear magnetic resonance gyroscope includes: step one, before the control starts, the nuclear magnetic resonance gyroscope works normally and ensures that the nuclear spin has been completely polarized to the longitudinal direction. When the nuclear magnetic resonance gyroscope is in a measurable state, the angular velocity is completely measured according to the measurement process of the composed pulsed measurement sequence according to the set angular velocity output rate to obtain raw data; step two, the raw data is segmented according to the set angular velocity output rate and the flag bit of the pulse sequence signal; step three, for each frame of the segmented raw data, after removing the excitation signal, the free relaxation segment signal is fitted to obtain the frequency when the inert gas nuclear spin relaxes freely from the transverse direction to the longitudinal direction, and the angular velocity is calculated according to the gyromagnetic ratio of different elements of the inert gas.
[0020] By applying this configuration, a method for pulsed angular velocity measurement of a nuclear magnetic resonance gyroscope is provided. This method applies an impact magnetic field to the nuclear spin in the magnetic resonance gas chamber to completely excite the nuclear spin from the longitudinal direction to the transverse direction, thereby improving the signal strength of the nuclear spin. Then, the angular velocity is measured during the free relaxation phase of the nuclear spin, thereby avoiding the measurement error caused by the nuclear spin being in a non-resonant state due to forced vibration. By adjusting the time interval between the applied impact magnetic fields to form a pulsed magnetic field, the output rate requirement equivalent to that during continuous measurement is achieved. Therefore, compared with the prior art, the pulsed angular velocity measurement method of the nuclear magnetic resonance gyroscope provided by the present invention can improve the amplitude of the nuclear spin signal and avoid the angular velocity measurement error caused by the forced resonance of the nuclear spin under the condition that the gas chamber performance remains unchanged.
[0021] Further, in the present invention, the pulsed measurement sequence formed according to the set angular velocity output rate is completely measured according to the measurement process for angular velocity, specifically including: applying a first shock magnetic field to the nuclear spins in the magnetic resonance chamber to completely excite the nuclear spins from longitudinal to transverse, and when the nuclear spin signal reaches a maximum value, performing angular velocity measurement in the nuclear spin free relaxation stage to complete the first cycle frequency measurement; applying a second shock magnetic field to the nuclear spins according to the intensity after the first measurement, and when the nuclear spin signal reaches a maximum value, performing angular velocity measurement in the nuclear spin free relaxation stage to complete the second cycle frequency measurement; applying a third shock magnetic field to the nuclear spins, and when the nuclear spin signal reaches a maximum value, performing angular velocity measurement in the nuclear spin free relaxation stage to complete the third cycle frequency measurement; repeating the above process, applying a fourth shock magnetic field, ..., Nth shock magnetic field to the nuclear spins in turn to complete the fourth cycle frequency measurement, ..., Nth cycle frequency measurement.
[0022] In the present invention, since the nuclear spin in the first cycle of pulse measurement is driven longitudinally to the maximum transverse signal, and except for the first cycle, the measurements in the remaining cycles are all made from the end point of the previous measurement cycle to make the nuclear spin reach the transverse maximum value again, the excitation signal of the first cycle is different from the excitation signals of the remaining cycles in amplitude or number of cycles.
[0023] Furthermore, in the present invention, obtaining a combined pulse measurement sequence specifically includes: determining the first period excitation signal or the remaining period excitation signals according to the judgment criterion that the end excitation is the excitation signal with the largest nuclear spin signal amplitude, that is, the optimal excitation signal; according to the judgment criterion of the first period excitation signal, optimizing the nuclear spin signal amplitude by adjusting the amplitude and width of the first period excitation signal, when the nuclear spin signal amplitude is the largest, it means that the amplitude and width of the first period excitation signal reach the optimized value, thereby obtaining the first period measurement optimal excitation signal; according to the judgment criterion of the remaining period excitation signals, optimizing the nuclear spin signal amplitude by adjusting the amplitude and width of the remaining period excitation signals, when the nuclear spin signal amplitude is the largest, it means that the amplitude and width of the remaining period excitation signals reach the optimized value, thereby obtaining the remaining period measurement optimal excitation signals; combining the first period measurement optimal excitation signal and multiple remaining period excitation signals to obtain a combined pulse measurement sequence.
[0024] As a specific embodiment of the present invention, in step 1, when the longitudinal laser polarization time exceeds the longitudinal relaxation time, it is considered that the nuclear spin has been completely polarized to the longitudinal direction. When the driving laser and the detection laser can work normally and the temperature of the atomic gas chamber reaches the set temperature, the nuclear magnetic resonance gyroscope is considered to be in a measurable state.
[0025] According to another aspect of the present invention, a system for pulsed angular velocity measurement of a nuclear magnetic resonance gyroscope is provided. The system for pulsed angular velocity measurement of a nuclear magnetic resonance gyroscope uses the method for pulsed angular velocity measurement of a nuclear magnetic resonance gyroscope as described above to measure angular velocity.
[0026] By applying this configuration, a nuclear magnetic resonance gyro pulsed angular velocity measurement system is provided. The system applies an impact magnetic field to the nuclear spin in the magnetic resonance gas chamber to completely excite the nuclear spin from the longitudinal direction to the transverse direction, thereby improving the signal strength of the nuclear spin. Then, the angular velocity is measured during the free relaxation phase of the nuclear spin, thereby avoiding the measurement error caused by the nuclear spin being in a non-resonant state due to forced vibration. The pulsed magnetic field is formed by adjusting the time interval between the applied impact magnetic fields to achieve the output rate requirement equivalent to that during continuous measurement. Therefore, compared with the prior art, the nuclear magnetic resonance gyro pulsed angular velocity measurement system provided by the present invention can improve the nuclear spin signal amplitude and avoid the angular velocity measurement error caused by the forced resonance of the nuclear spin under the condition that the gas chamber performance remains unchanged.
[0027] In order to further understand the present invention, the following Figures 1 to 3 The method for measuring angular velocity by pulsed nuclear magnetic resonance gyroscope provided by the present invention is described in detail.
[0028] like Figures 1 to 3 As shown, according to a specific embodiment of the present invention, a method for pulsed measurement of angular velocity of a nuclear magnetic resonance gyroscope is provided, including a method for obtaining a pulsed sequence of a nuclear magnetic resonance gyroscope, and a method for measuring angular velocity using a pulse sequence. The method is mainly aimed at the fact that in the process of continuous measurement of angular velocity by the current nuclear magnetic resonance gyroscope, it is necessary to continuously excite the nuclear spins in the magnetic resonance gas chamber with a transverse magnetic field. In this spin ensemble control method, the amplitude of the nuclear spin signal will be limited by the transverse relaxation time; and under the continuous excitation condition, it is still impossible to completely ensure that the nuclear spins are in a resonant state, and it is impossible to ensure that the gyroscope is in a normal working state. By applying an impact magnetic field to the nuclear spins in the magnetic resonance gas chamber, the nuclear spins are completely excited from the longitudinal direction to the transverse direction, and the nuclear spin signal intensity is improved by this method; then, the angular velocity is measured in the free relaxation stage of the nuclear spin, avoiding the measurement error caused by the nuclear spin being in a non-resonant state due to forced vibration, and the pulse magnetic field is formed by adjusting the time interval between the applied impact magnetic fields to achieve the output rate requirement equivalent to that during continuous measurement.
[0029] The purpose of the present invention is to provide a control method for a nuclear magnetic resonance gyroscope which can improve the nuclear spin signal amplitude and avoid angular velocity measurement errors caused by forced resonance of the nuclear spin under the condition that the gas chamber performance remains unchanged.
[0030] The technical solution of the present invention:
[0031] The present invention provides a control method for a nuclear magnetic resonance gyroscope, which can improve the amplitude of nuclear spin signals and avoid angular velocity measurement errors caused by forced resonance of nuclear spins under the condition that the performance of the gas chamber remains unchanged. By applying an impact magnetic field to the nuclear spins in the magnetic resonance gas chamber, the nuclear spins are completely excited from longitudinal to transverse, thereby improving the nuclear spin signal intensity; then, the angular velocity is measured during the free relaxation stage of the nuclear spins, thereby avoiding measurement errors caused by the nuclear spins being in a non-resonant state due to forced vibration, and by adjusting the time interval between the applied impact magnetic fields to form a pulsed magnetic field, the output rate requirement equivalent to that during continuous measurement is achieved. The above means are used to achieve the goal of improving the angular velocity measurement capability of the nuclear magnetic resonance gyroscope.
[0032] The above method implements the operation flow chart as follows Figure 1 As shown:
[0033] First of all, before testing, it is necessary to obtain the corresponding pulse sequence for the output angular rate. Since the nuclear spin in the first cycle of pulse measurement is driven from the longitudinal direction to the maximum transverse signal, and except for the first cycle, the measurements in the remaining cycles are all from the end point of the previous measurement cycle to the nuclear spin reaching the transverse maximum again, so the excitation signal of the first cycle and the excitation signals of the remaining cycles will be different in amplitude or number of cycles. The criterion for determining the excitation signal of the first cycle or the excitation signal of the remaining cycles is that the end excitation is the nuclear spin signal with the largest amplitude, which is the optimal excitation signal. The measured excitation signal and the nuclear spin response signal are as follows: Figure 2 As shown:
[0034] By adjusting the pulse signal amplitude and width, the nuclear spin signal amplitude can be optimized. When the nuclear spin signal amplitude is the largest, it means that the pulse signal amplitude and width reach the optimized value. In the free relaxation stage, which is the angular velocity measurement stage, the angular velocity measured in the free relaxation stage can be obtained by fitting the waveform using the nuclear spin free relaxation model.
[0035] After obtaining the signal form of the optimal excitation signal for the first measurement and the subsequent periodic excitation signal, these signals can be combined into a pulse sequence to continuously measure the angular rate of the nuclear magnetic resonance gyroscope.
[0036] Under the condition of obtaining a reliable pulse sequence, the method of using pulsed method to measure angular rate is described in detail:
[0037] First, the NMR gyro works normally before the operation begins, and the nuclear spin is fully polarized to the longitudinal direction. In theory, the longitudinal laser polarization time exceeds the longitudinal relaxation time T1. When the NMR gyro is in a measurable state (the driving / detection laser works normally, and the air chamber temperature reaches the set temperature), the pulsed measurement sequence is composed according to the specified angular velocity output rate to fully measure the angular velocity according to the measurement process to obtain the most original data. The measurement timing diagram is shown in the figure below. Figure 3 As shown;
[0038] The second step is to segment the raw data according to the output rate specified by the angular velocity and the flag bit of the pulse sequence signal;
[0039] The third step is to fit the free relaxation segment signal of each frame of segmented raw data after removing the excitation signal to obtain the frequency of the nuclear spin of the inert gas (including two isotopes 129 and 131) when it relaxes freely from transverse to longitudinal direction, and calculate the angular velocity according to the gyromagnetic ratio of different elements of the inert gas.
[0040] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0041] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.
[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A method for measuring angular velocity using a nuclear magnetic resonance gyroscope pulse, characterized in that: The nuclear magnetic resonance gyro pulsed angular velocity measurement method comprises: Step 1: Before the control begins, the NMR gyro works normally and ensures that the nuclear spin has been completely polarized to the longitudinal direction. When the NMR gyro is in a measurable state, the angular velocity is completely measured according to the measurement process by the pulse measurement sequence formed according to the set angular velocity output rate to obtain the original data; Step 2, segmenting the raw data according to the set angular velocity output rate and the flag bit of the pulse sequence signal; Step three, for each frame of segmented raw data, after removing the excitation signal, fit the free relaxation segment signal to obtain the frequency of the inert gas nuclear spin when it relaxes freely from the transverse to the longitudinal direction, and calculate the angular velocity according to the gyromagnetic ratio of different elements of the inert gas.
2. The method for measuring angular velocity using a nuclear magnetic resonance gyroscope pulsed method according to claim 1, characterized in that: According to the set angular rate output rate, the pulse measurement sequence is composed according to the measurement process to fully measure the angular rate, including: Apply the first impact magnetic field to the nuclear spins in the magnetic resonance chamber to completely excite the nuclear spins from the longitudinal direction to the transverse direction. When the nuclear spin signal reaches the maximum value, measure the angular velocity in the nuclear spin free relaxation stage to complete the first periodic frequency measurement. A second impact magnetic field is applied to the nuclear spin according to the intensity after the first measurement. When the nuclear spin signal reaches a maximum value, the angular velocity is measured in the nuclear spin free relaxation stage to complete the second periodic frequency measurement; Applying a third impact magnetic field to the nuclear spin, when the nuclear spin signal reaches a maximum value, measuring the angular velocity in the nuclear spin free relaxation phase, and completing the third periodic frequency measurement; The above process is repeated to sequentially apply the fourth shock magnetic field, ..., and the Nth shock magnetic field to the nuclear spins to complete the fourth cycle frequency measurement, ..., and the Nth cycle frequency measurement.
3. The method for measuring angular velocity using a nuclear magnetic resonance gyroscope pulsed method according to claim 2, characterized in that: Since in the first cycle of pulse measurement, the nuclear spin is driven longitudinally to the maximum transverse signal point, and except for the first cycle, the measurements in the remaining cycles are all made to make the nuclear spin reach the transverse maximum value again from the end point of the previous measurement cycle, the excitation signal of the first cycle is different from the excitation signals of the remaining cycles in amplitude or number of cycles.
4. The method for measuring angular velocity using a nuclear magnetic resonance gyroscope pulsed method according to claim 3, characterized in that: Acquiring a combined pulse measurement sequence specifically includes: The criterion for determining the first cycle excitation signal or the remaining cycle excitation signals is that the excitation is terminated when the nuclear spin signal amplitude is the largest, that is, the optimal excitation signal; According to the judgment standard of the first period excitation signal, the amplitude of the nuclear spin signal is optimized by adjusting the amplitude and width of the first period excitation signal. When the amplitude of the nuclear spin signal is the largest, it means that the amplitude and width of the first period excitation signal reach the optimized value, thereby obtaining the first period measurement optimal excitation signal; According to the judgment criteria of the remaining period excitation signals, the amplitude of the nuclear spin signal is optimized by adjusting the amplitude and width of the remaining period excitation signals. When the amplitude of the nuclear spin signal is the largest, it means that the amplitude and width of the remaining period excitation signals reach the optimized value, thereby obtaining the optimal excitation signal for the remaining period measurement; The first period measurement optimal excitation signal and a plurality of remaining period excitation signals are combined to obtain a combined pulse measurement sequence.
5. The method for measuring angular velocity using a nuclear magnetic resonance gyroscope pulsed method according to claim 4, characterized in that: When the longitudinal laser polarization time exceeds the longitudinal relaxation time, the nuclear spin is considered to be completely polarized to the longitudinal direction.
6. The method for measuring angular velocity using a nuclear magnetic resonance gyroscope in pulsed mode according to claim 5, characterized in that: When the driving laser and the detection laser can work normally and the temperature of the atomic gas chamber reaches the set temperature, it is considered that the nuclear magnetic resonance gyroscope is in a measurable state.
7. A nuclear magnetic resonance gyro pulse angular velocity measurement system, characterized in that: The NMR gyro pulsed angular rate measurement system uses the NMR gyro pulsed angular rate measurement method according to any one of claims 1 to 6 to perform angular rate measurement.