Self-adaptive parameter optimization degaussing system and method for miniaturized nuclear magnetic resonance gyroscope

Abstract

The invention provides a self-adaptive parameter optimization degaussing system and method for a miniaturized nuclear magnetic resonance gyroscope, and belongs to the technical field of nuclear magnetic resonance gyroscope degaussing, and the self-adaptive parameter optimization degaussing system comprises a magnetometer, a pair of coils, a computer, a signal generator, a power amplifier, a transformer, a circuit switch, a contact current sensor and an AD module, a degaussing scheme based on an attenuation alternating current magnetic field is set through two working modes of degaussing operation and magnetizing operation, a new degaussing system architecture is used, it is ensured that actual degaussing current information is consistent with expected parameters, on the other hand, degaussing parameter optimization can be automatically carried out by comparing residual magnetism information in a shielding cylinder after each degaussing, and the degaussing efficiency is improved. The time cost is reduced, the demagnetization efficiency is improved, the zero-bias stability of the gyroscope is improved, the demagnetization operation of magnetizing-demagnetization circulation is efficiently realized, the operation is safe and reliable, and the method is suitable for popularization.

Description

Technical Field

[0001] The present invention belongs to the technical field of charging and demagnetizing a nuclear magnetic resonance gyroscope, in particular to a self-adaptive parameter optimization demagnetization system and method for a miniaturized nuclear magnetic resonance gyroscope. Background Art

[0002] Inertial navigation technology is a navigation method that does not rely on external signals. It features high autonomy, continuous output, and resistance to external interference, making it crucial for civilian navigation. A gyroscope is an inertial sensor that senses the angular velocity of a carrier. Its accuracy largely determines the accuracy of the inertial system. With the rapid development of quantum technology and advances in micro-nanofabrication and manufacturing, miniaturization and integration of gyroscopes while maintaining accurate measurement have become a new research hotspot. Nuclear magnetic resonance gyroscopes (NMR gyroscopes) have matured in design and implementation, offering significant advantages such as vibration insensitivity, compact size, and high precision. They are expected to become a new type of low-cost, high-precision quantum inertial sensor.

[0003] The nuclear magnetic resonance gyroscope is based on the principle of nuclear magnetic resonance and uses the atomic spin effect to detect the angular velocity of the carrier. By applying magnetic fields and light fields, the atomic resonance state can be manipulated and the atomic spin signal can be detected. The nuclear magnetic resonance gyroscope requires stable and uniform working magnetic field conditions. The magnetic shielding system is an effective method to isolate the sensitive elements of the nuclear magnetic resonance gyroscope from the external environmental magnetic field. It is composed of multiple layers of high magnetic permeability metal and is used to shield most of the external magnetic field. During the operation of the gyroscope, magnetization will occur inside the magnetic shielding system due to changes in the internal and external magnetic fields of the magnetic shielding system, temperature fluctuations, and disassembly and assembly of shielding materials. Long-term use will lead to a decrease in the effectiveness of the magnetic shielding, reduce the shielding effectiveness, generate residual magnetic fields and uneven magnetic field gradients, and reduce the zero-bias stability of the gyroscope. The uneven magnetic field gradient will cause different precession frequencies of alkali metal atoms, resulting in a decrease in the nuclear spin relaxation time, thereby reducing the output signal-to-noise ratio, response bandwidth and sensitivity, and affecting key gyroscope indicators such as angular random walk.

[0004] Regular demagnetization of the magnetic shielding system is an effective means to reduce the residual magnetic field, improve the magnetic field uniformity, and restore the magnetic shielding effectiveness; how to achieve a low magnetic field environment inside the shielding system through repeatable, uniform, and efficient demagnetization is one of the key issues to further improve the accuracy of nuclear magnetic resonance gyroscopes.

[0005] Similarly, the core sensitive components of the miniaturized nuclear magnetic resonance gyroscope also need to work in a stable and uniform magnetic field environment. During the operation of the miniaturized nuclear magnetic resonance gyroscope, the magnetic shielding effectiveness of the magnetic shielding tube will also decrease due to changes in the internal and external magnetic fields of the magnetic shielding system and the disassembly and assembly of the shielding materials. In order to restore the magnetic shielding effectiveness of the magnetic shielding tube, demagnetization operations are required regularly.

[0006] The demagnetization scheme adopted in the existing technology is open-loop control of the demagnetization process, that is, the single demagnetization parameters are manually set, and the demagnetization system generates a demagnetization current for demagnetization. After each demagnetization, the residual magnetism and magnetic field gradient information need to be measured to evaluate the demagnetization effect; however, in actual operation, different magnetic shielding tubes have different materials and structures, and the required optimal demagnetization parameters are also different. The current demagnetization scheme cannot automatically find and match the optimal demagnetization parameters, resulting in low demagnetization efficiency and difficulty in unifying standards.

[0007] Based on the above reasons, there is an urgent need to design a new adaptive parameter optimization demagnetization system that can automatically optimize the demagnetization parameters while meeting the basic demagnetization requirements to meet the needs of intelligence and automation.

[0008] At present, the research on demagnetization system mainly consists of two parts:

[0009] On the one hand: it is about analyzing the influence of different demagnetization current parameters on the demagnetization effect;

[0010] Such as demagnetization current frequency, envelope shape, maximum initial amplitude and number of demagnetization cycles.

[0011] On the other hand: it is to study the hardware composition of the demagnetization system and improve the demagnetization effect and stability by changing the system composition (such as adding low-pass filters, transformers, attenuators, etc.).

[0012] However, when the demagnetization object changes, it is necessary to re-analyze and manually find the optimal demagnetization parameters. The above solution cannot meet the requirements of intelligent, fast and stable demagnetization. Therefore, the development of a more intelligent demagnetization system is very important to meet the demagnetization needs of miniaturized nuclear magnetic resonance gyroscopes and improve the key indicators of miniaturized nuclear magnetic resonance gyroscopes, such as the output signal-to-noise ratio, response bandwidth and sensitivity, and angular random walk.

[0013] In order to solve the above problems, the prior art has designed the following solutions, for example:

[0014] ① A degaussing device, degaussing system, and degaussing method for a geomagnetic shielding room (CN113903545A) discloses a degaussing device, degaussing system, and degaussing method for a geomagnetic shielding room. The main design concept is to design multiple parallel power amplifier circuits. During each degaussing operation, the expected output current is first obtained, and then the corresponding power amplifier unit is driven according to the expected output current. The system structure includes a degaussing coil wound in the geomagnetic shielding room and a drive circuit that supplies power to the degaussing coil.

[0015] The disadvantage of this solution is that the demagnetization process control is open-loop, and it is impossible to observe and test whether the various indicators of the demagnetization current meet the requirements. In addition, the demagnetization parameters need to be manually debugged, and a lot of time and energy are required in the demagnetization test and parameter optimization process.

[0016] ② A method for overall demagnetization of a small multi-layer combined magnetic shielding system (CN109411181A) is designed for an overall demagnetization method of a small multi-layer combined magnetic shielding system. A signal generator (composed of a computer and a data acquisition card, or a programmable signal generator can be directly used) is used to generate a demagnetization signal, and then a current signal is obtained through a power amplifier. Demagnetization is achieved through the demagnetization coils wound around each layer of the disk shielding tube.

[0017] This solution is similar to Solution ①. The demagnetization process control is also open-loop. It is impossible to observe and test whether the various indicators of the demagnetization current meet the requirements. It takes a lot of time to find the optimal demagnetization parameters. Summary of the Invention

[0018] In order to solve the above technical problems, the present invention provides an adaptive parameter optimization demagnetization system and method for a miniaturized nuclear magnetic resonance gyroscope. By applying a demagnetization method of a decaying AC magnetic field and combining it with the basic demagnetization system architecture of a signal generator plus a power amplifier, a new demagnetization system is designed. This system can not only efficiently realize the basic demagnetization function, but also automatically optimize the demagnetization parameters, meeting the needs of intelligence and automation.

[0019] First, the adaptive parameter optimization demagnetization system for a miniaturized nuclear magnetic resonance gyroscope includes: a magnetometer, a pair of coils, a computer, a signal generator, a power amplifier, a transformer, a circuit switch, a contact current sensor, and an AD module, wherein:

[0020] The magnetometer is used to measure the residual magnetism in the magnetic shielding cylinder;

[0021] The pair of coils are wound around the magnetic shielding cylinder;

[0022] The computer is used to run the host computer software and has the functions of sending expected parameters and process control;

[0023] The signal generator is used to generate a demagnetization voltage signal after receiving the parameters sent by the host computer;

[0024] The power amplifier is used to convert the demagnetization voltage signal into a demagnetization current signal and perform power amplification;

[0025] The transformer is used to isolate DC signals;

[0026] The circuit switch is used to control the on and off of the demagnetization current signal and has two working modes:

[0027] ① When the circuit switch is closed: the demagnetization current signal passes through the contact current sensor and is applied to the pair of coils;

[0028] ② When the circuit switch is open: the demagnetization current signal first passes through the transformer, then passes through the contact current sensor, and is applied to a pair of coils;

[0029] As an example, the contact current sensor: obtains an analog value by sensing the current value through the Hall effect; is used to sample the demagnetization current signal and upload it to the host computer software;

[0030] During the demagnetization process, due to changes in the winding method (inductive and resistive loads), hardware circuit status (temperature, component value drift, noise), etc., the actual demagnetization current generated may not match the expected parameters, thus interfering with the demagnetization results.

[0031] After the host computer software obtains the sampled demagnetization current signal, it performs parameter fitting and calculates the true envelope function of the current; and dynamically adjusts the expected parameters so that the demagnetization current signal is consistent with the expected parameters.

[0032] The AD module converts the collected analog demagnetization current signal into a digital signal and transmits it to the host computer software.

[0033] As an example, the magnetic shielding tube refers to a magnetic shielding tube of a miniaturized nuclear magnetic resonance gyroscope.

[0034] As an example, the pair of coils are wound around the magnetic shielding cylinder in a left-right symmetrical manner.

[0035] As an example, the demagnetization voltage signal is a demagnetization waveform.

[0036] Secondly, the adaptive parameter optimization demagnetization method of the miniaturized nuclear magnetic resonance gyroscope includes:

[0037] Step 1: Determine the magnetic shielding tube of the miniaturized nuclear magnetic resonance gyroscope that needs magnetic operation, wind a pair of coils on the magnetic shielding tube; and place the magnetometer at the center of the magnetic shielding tube;

[0038] Step 2: When the magnetic operation is a demagnetization operation;

[0039] The computer runs the host software and sets the expected parameters;

[0040] At the same time, set the circuit switch to open;

[0041] The host computer software sends the initial degaussing parameters to the signal generator;

[0042] The signal generator calculates and generates a demagnetization voltage signal according to the initial demagnetization parameters;

[0043] The demagnetization voltage signal is converted into a demagnetization current signal through a power amplifier and then power amplified;

[0044] The power-amplified demagnetization current signal is transmitted to the transformer, and the demagnetization current signal output by the transformer is applied to a pair of coils after passing through a contact current sensor to demagnetize the magnetic shielding cylinder. At the same time, the contact current sensor collects the demagnetization current information in real time and uploads it to the host computer software through the AD module for analysis and dynamic adjustment.

[0045] After the demagnetization operation is completed, the magnetometer transmits the residual magnetic field information in the barrel to the upper computer software. The upper computer software analyzes whether the collected residual magnetic field information meets the demagnetization requirements. When the residual magnetic field information meets the demagnetization operation requirements, the demagnetization is considered to be successfully completed. The computer saves the residual magnetic field information after this demagnetization operation as a reference for future demagnetization operations; when the residual magnetic field information does not meet the demagnetization operation requirements, the demagnetization operation is determined to have failed.

[0046] As an example, when it is determined that the degaussing operation has failed, the computer is turned on, new desired parameter settings are made, and the degaussing operation is repeated again.

[0047] As an example, after successfully completing the demagnetization operation, the host computer software saves the expected parameters and the residual magnetic field information after demagnetization. The specific purpose is to optimize the parameters such as the demagnetization current frequency, the number of demagnetization current cycles, the initial amplitude of the demagnetization current, and the demagnetization current envelope shape; and to facilitate the subsequent setting of the host computer software.

[0048] Taking the optimization of demagnetization current frequency as an example, a demagnetization current frequency is initially set. The residual magnetic field value corresponding to each demagnetization current frequency is recorded in the order of demagnetization-magnetization-parameter modification and then demagnetization. This can realize the automatic optimization of demagnetization current parameters.

[0049] As an example, the demagnetization current signal contains a DC component, which, when directly applied to a pair of coils, will affect the residual magnetic field of the magnetic shielding tube after the demagnetization operation. Therefore, the circuit switch is set to open circuit so that the demagnetization current signal passes through the transformer to filter out the DC component.

[0050] Step 3: During magnetization operation;

[0051] The computer runs the host software and sets the current bias value;

[0052] At the same time, set the circuit switch to closed;

[0053] The host computer software sends the current bias value to the signal generator;

[0054] The signal generator calculates and generates a bias voltage signal according to the current bias value;

[0055] The bias voltage signal is converted into a bias current signal through a power amplifier and power amplified;

[0056] The bias current signal after power amplification is applied to a pair of coils through a contact current sensor to magnetize the magnetic shielding tube. At the same time, the contact current sensor collects bias current information in real time and uploads it to the host computer software through the AD module for analysis and dynamic adjustment.

[0057] After the magnetization operation is completed, the magnetometer transmits the residual magnetic field information in the barrel to the host computer software. The host computer software analyzes whether the collected residual magnetic field information meets the magnetization requirements. When the residual magnetic field information meets the magnetization operation requirements, it is considered that the magnetization is successfully completed. The computer saves the residual magnetic field information after this magnetization operation as a reference for future magnetization operations; when the residual magnetic field information does not meet the magnetization operation requirements, it is determined that the magnetization operation has failed.

[0058] Beneficial effects of the present invention:

[0059] The current demagnetization system of the existing nuclear magnetic resonance gyroscope system consists of a signal generator, a power amplifier, a transformer and a demagnetization coil. The expected waveform data is imported into the signal generator to generate waveform data that meets the demagnetization parameters. The power amplifier realizes the conversion from voltage to current. The transformer realizes the isolation of DC and the coupling of multiple currents, which are finally applied to the demagnetization coil. It is impossible to monitor and analyze the demagnetization current in real time, and it is impossible to determine whether the demagnetization current on the demagnetization coil meets the design expectations. The demagnetization effect needs to be manually measured and analyzed after each demagnetization, and the demagnetization parameters need to be manually optimized, which will take extra time.

[0060] Based on a demagnetization scheme that attenuates the AC magnetic field, this invention utilizes a novel demagnetization system architecture to design an adaptive parameter optimization demagnetization system for miniaturized nuclear magnetic resonance gyros. This system can detect demagnetization current information in real time, ensuring that the actual demagnetization current information is consistent with the expected parameters. Furthermore, by comparing the residual magnetism within the shielding tube after each demagnetization, it automatically optimizes the demagnetization parameters, reducing time costs, improving demagnetization efficiency, and ultimately enhancing the gyro's zero-bias stability.

[0061] The present invention can sample and analyze the demagnetization current signal, efficiently realize the demagnetization operation of the magnetization-demagnetization cycle, and record and compare the demagnetization effects of different demagnetization parameters. Compared with manual adjustment and recording of demagnetization parameters, the present invention has faster experimental efficiency, helps to find the optimal demagnetization parameters more quickly, and improves the signal-to-noise ratio of the nuclear magnetic gyroscope.

[0062] The present invention avoids the demagnetization experiment preparation and switching steps that rely on manual search for optimal demagnetization parameters. By combining the demagnetization system with the host computer software, the demagnetization experiment and the recording of the residual magnetic field after demagnetization are automatically performed, thereby eliminating the errors caused by differences in manual proficiency and improving the effectiveness of the demagnetization parameter comparison experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 This is a schematic diagram of the overall structure of the adaptive parameter optimization degaussing system for the miniaturized nuclear magnetic resonance gyroscope of the present invention.

[0064] Figure 2 The figure is a schematic diagram of the process structure of the adaptive parameter optimization demagnetization method of the miniaturized nuclear magnetic resonance gyroscope of the present invention. DETAILED DESCRIPTION

[0065] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work shall fall within the scope of protection of the present application. Figures 1 to 2 As shown:

[0066] First, an adaptive parameter optimization degaussing system for a miniaturized nuclear magnetic resonance gyroscope includes: a magnetometer 2, a pair of coils 3, a computer 4, a signal generator 5, a power amplifier 6, a transformer 7, a circuit switch 8, a contact current sensor 9, and an AD module 10, wherein:

[0067] The magnetometer 2 is used to measure the residual magnetism in the magnetic shielding tube;

[0068] The pair of coils 3 are wound around the magnetic shielding cylinder 1;

[0069] The computer 4 is used to run the host computer software and has the functions of sending expected parameters and process control;

[0070] The signal generator 5 is used to generate a demagnetization voltage signal after receiving the parameters sent by the host computer;

[0071] The power amplifier 6 is used to convert the demagnetization voltage signal into a demagnetization current signal and perform power amplification;

[0072] The transformer 7 is used to isolate the DC signal;

[0073] The circuit switch 8 is used to control the on / off of the demagnetization current signal and has two working modes:

[0074] ① When the circuit switch 8 is closed: the demagnetization current signal passes through the contact current sensor and is applied to the pair of coils;

[0075] ② When the circuit switch 8 is open: the demagnetization current signal first passes through the transformer, then passes through the contact current sensor, and is applied to the coil;

[0076] As an example, the contact current sensor 9: obtains an analog value by sensing the current value through the Hall effect; is used to sample the demagnetization current signal and upload it to the host computer software;

[0077] During the demagnetization process, due to changes in the winding method (inductive and resistive loads), hardware circuit status (temperature, component value drift, noise), etc., the actual demagnetization current generated may not match the expected parameters, thus interfering with the demagnetization results.

[0078] After the host computer software obtains the sampled demagnetization current signal, it performs parameter fitting and calculates the true envelope function of the current; and dynamically adjusts the expected parameters so that the demagnetization current signal is consistent with the expected parameters.

[0079] The AD module 10 converts the collected analog demagnetization current signal into a digital signal and transmits it to the host computer software.

[0080] As an example, the magnetic shielding tube refers to a magnetic shielding tube of a miniaturized nuclear magnetic resonance gyroscope.

[0081] As an example, the pair of coils are wound around the magnetic shielding cylinder in a left-right symmetrical manner.

[0082] As an example, the demagnetization voltage signal is a demagnetization waveform.

[0083] Secondly, the adaptive parameter optimization demagnetization method of the miniaturized nuclear magnetic resonance gyroscope includes:

[0084] Step 1: Determine the magnetic shielding tube of the miniaturized nuclear magnetic resonance gyroscope that needs magnetic operation, wind a pair of coils on the magnetic shielding tube; and place the magnetometer at the center of the magnetic shielding tube;

[0085] Step 2: When the magnetic operation is a demagnetization operation;

[0086] The computer runs the host software and sets the expected parameters;

[0087] At the same time, the circuit switch 8 is set to open;

[0088] The host computer software sends the initial degaussing parameters to the signal generator 5;

[0089] The signal generator 5 calculates and generates a demagnetization voltage signal according to the initial demagnetization parameters;

[0090] The demagnetization voltage signal is converted into a demagnetization current signal through the power amplifier 6 and then power amplified;

[0091] The power-amplified demagnetization current signal is transmitted to the transformer 7, and the demagnetization current signal output by the transformer 7 is applied to a pair of coils 3 after passing through the contact current sensor 9 to demagnetize the magnetic shielding tube. At the same time, the contact current sensor collects the demagnetization current information in real time and uploads it to the host computer software through the AD module for analysis and dynamic adjustment.

[0092] After the demagnetization operation is completed, magnetometer 2 transmits the residual magnetic field information in the magnetic shielding tube to the host computer software. The host computer software analyzes whether the collected residual magnetic field information meets the demagnetization requirements. When the residual magnetic field information meets the demagnetization operation requirements, the demagnetization is considered to be successfully completed. The computer saves the residual magnetic field information after the demagnetization operation as a reference for future demagnetization operations; when the residual magnetic field information does not meet the demagnetization operation requirements, the demagnetization operation is determined to have failed.

[0093] As an example, when it is determined that the degaussing operation has failed, the computer 4 is turned on, new expected parameters are set, and the degaussing operation is repeated again.

[0094] As an example, after successfully completing the demagnetization operation, the host computer software saves the expected parameters and the residual magnetic field information after demagnetization. The specific purpose is to optimize the parameters such as the demagnetization current frequency, the number of demagnetization current cycles, the initial amplitude of the demagnetization current, and the demagnetization current envelope shape; and to facilitate the subsequent setting of the host computer software.

[0095] Taking the optimization of demagnetization current frequency as an example, a demagnetization current frequency is initially set. The residual magnetic field value corresponding to each demagnetization current frequency is recorded in the order of demagnetization-magnetization-parameter modification and then demagnetization. This can realize the automatic optimization of demagnetization current parameters.

[0096] As an example, the demagnetization current signal contains a DC component, which, when directly applied to a pair of coils, will affect the residual magnetic field of the magnetic shielding tube after the demagnetization operation. Therefore, the circuit switch is set to open circuit so that the demagnetization current signal passes through the transformer to filter out the DC component.

[0097] Step 3: During magnetization operation;

[0098] Computer 4 runs the host computer software and sets the current bias value;

[0099] At the same time, the circuit switch 8 is set to closed;

[0100] The host computer software sends the current bias value to the signal generator;

[0101] The signal generator 5 calculates and generates a bias voltage signal according to the current bias value;

[0102] The bias voltage signal is converted into a bias current signal through the power amplifier 6 and power amplified;

[0103] The bias current signal after power amplification is applied to a pair of coils 3 through a contact current sensor to magnetize the magnetic shielding tube 1. At the same time, the contact current sensor collects bias current information in real time and uploads it to the host computer software through the AD module for analysis and dynamic adjustment.

[0104] After the magnetization operation is completed, the magnetometer transmits the residual magnetic field information in the magnetic shielding tube 1 to the host computer software, and the host computer software analyzes whether the collected residual magnetic field information meets the magnetization requirements. When the residual magnetic field information meets the magnetization operation requirements, it is considered that the magnetization is successfully completed. The computer 4 saves the residual magnetic field information after this magnetization operation as a reference for future magnetization operations; when the residual magnetic field information does not meet the magnetization operation requirements, it is determined that this magnetization operation has failed.

[0105] The pair of coils 3 is a two-way switch;

[0106] One end of the magnetometer 2 is electrically connected to one end of the computer 4; the other end of the computer 4 is electrically connected to one end of the signal generator 5, the other end of the signal generator 5 is electrically connected to one end of the power amplifier 6, the other end of the power amplifier 6 is electrically connected to one end of the circuit switch 8, the other end of the circuit switch 8 is electrically connected to one end of the contact current sensor 9, the other end of the contact current sensor 9 is electrically connected to one end of the AD module 10; the other end of the AD module 10 is electrically connected to another end of the computer 4; another end of the contact current sensor 9 is electrically connected to the pair of coils 3; the circuit switch 8 is connected in parallel with the transformer 7.

[0107] In order to better illustrate the design principle of the present invention, a brief introduction of the principle is now described as follows:

[0108] Demagnetization can also be called demagnetization.

[0109] Generally speaking, materials can be demagnetized by applying stress, uniformly heating to the Curie temperature, applying a decaying AC magnetic field, etc.

[0110] Attenuated AC magnetic fields are commonly used to demagnetize enclosed ferromagnetic structures, such as ships and shielded rooms. To uniformly demagnetize a multi-layer magnetic shielding system, a demagnetizing coil is wrapped around the object to be demagnetized. An AC current signal, whose amplitude gradually decays to zero, is passed through the coil to achieve demagnetization. After ideal demagnetization, the shielding material follows a non-hysteretic magnetization curve (the ideal magnetization curve).

[0111] The above are only preferred embodiments of the present invention. It should be understood that the description of the above embodiments is only used to help understand the method and core ideas of the present invention, and is not used to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, etc. made within the ideas and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An adaptive parameter optimization degaussing system for a miniaturized nuclear magnetic resonance gyroscope, characterized in that: include: A magnetometer, a pair of coils, a computer, a signal generator, a power amplifier, a transformer, a circuit switch, a contact current sensor, and an AD module, wherein: The magnetometer is used to measure the residual magnetism in the magnetic shielding cylinder; The pair of coils are wound around the magnetic shielding cylinder; The computer is used to run the host computer software and has the functions of sending expected parameters and process control; The signal generator is used to generate a demagnetization voltage signal after receiving the parameters sent by the host computer; The power amplifier is used to convert the demagnetization voltage signal into a demagnetization current signal and perform power amplification; The transformer is used to isolate DC signals; The circuit switch is used to control the on and off of the demagnetization current signal and has two working modes: ① When the circuit switch is closed: the demagnetization current signal passes through the contact current sensor and is applied to the pair of coils; ② When the circuit switch is open: the demagnetization current signal first passes through the transformer, then passes through the contact current sensor, and is applied to the coil; The AD module converts the collected analog demagnetization current signal into a digital signal and transmits it to the host computer software.

2. The adaptive parameter optimization degaussing system for a miniaturized nuclear magnetic resonance gyroscope according to claim 1, characterized in that: The contact current sensor senses the current value passing through the Hall effect to obtain an analog value; the analog value is used to sample the demagnetization current signal and upload it to the host computer software; after the host computer software obtains the sampled demagnetization current signal, it performs parameter fitting and calculates the true envelope function of the current; and dynamically adjusts the expected parameters so that the demagnetization current signal is consistent with the expected parameters.

3. The adaptive parameter optimization degaussing system for a miniaturized nuclear magnetic resonance gyroscope according to claim 1, characterized in that: The magnetic shielding tube refers to a magnetic shielding tube of a miniaturized nuclear magnetic resonance gyroscope.

4. The adaptive parameter optimization degaussing system for a miniaturized nuclear magnetic resonance gyroscope according to claim 1, characterized in that: The pair of coils are wound around the magnetic shielding cylinder in a left-right symmetrical manner.

5. An adaptive parameter optimization demagnetization method for a miniaturized nuclear magnetic resonance gyroscope, characterized in that: include: Step 1: Determine the magnetic shielding tube of the miniaturized nuclear magnetic resonance gyroscope that needs magnetic operation, wind a pair of coils on the magnetic shielding tube; and place the magnetometer at the center of the magnetic shielding tube; Step 2: When the magnetic operation is a demagnetization operation; The computer runs the host software and sets the expected parameters; At the same time, set the circuit switch to open; The host computer software sends the initial degaussing parameters to the signal generator; The signal generator calculates and generates a demagnetization voltage signal according to the initial demagnetization parameters; The demagnetization voltage signal is converted into a demagnetization current signal through a power amplifier and then power amplified; The power-amplified demagnetization current signal is transmitted to the transformer, and the demagnetization current signal output by the transformer is applied to a pair of coils after passing through a contact current sensor to demagnetize the magnetic shielding cylinder. At the same time, the contact current sensor collects the demagnetization current information in real time and uploads it to the host computer software through the AD module for analysis and dynamic adjustment. After the demagnetization operation is completed, the magnetometer transmits the residual magnetic field information in the barrel to the host computer software. The host computer software analyzes whether the collected residual magnetic field information meets the demagnetization requirements. If the residual magnetic field information meets the demagnetization operation requirements, the demagnetization is considered to be successfully completed. The computer saves the residual magnetic field information after the demagnetization operation as a reference for future demagnetization operations; if the residual magnetic field information does not meet the demagnetization operation requirements, the demagnetization operation is considered to have failed. Step 3: During magnetization operation; The computer runs the host software and sets the current bias value; At the same time, set the circuit switch to closed; The host computer software sends the current bias value to the signal generator; The signal generator calculates and generates a bias voltage signal according to the current bias value; The bias voltage signal is converted into a bias current signal through a power amplifier and power amplified; The bias current signal after power amplification is applied to a pair of coils through a contact current sensor to magnetize the magnetic shielding tube. At the same time, the contact current sensor collects bias current information in real time and uploads it to the host computer software through the AD module for analysis and dynamic adjustment. After the magnetization operation is completed, the magnetometer transmits the residual magnetic field information in the barrel to the host computer software. The host computer software analyzes whether the collected residual magnetic field information meets the magnetization requirements. When the residual magnetic field information meets the magnetization operation requirements, it is considered that the magnetization is successfully completed. The computer saves the residual magnetic field information after this magnetization operation as a reference for future magnetization operations; when the residual magnetic field information does not meet the magnetization operation requirements, it is determined that the magnetization operation has failed.

6. The method for adaptive parameter optimization and demagnetization of a miniaturized nuclear magnetic resonance gyroscope according to claim 5, characterized in that: When the degaussing operation is determined to have failed, the computer is turned on, new expected parameter settings are made, and the degaussing operation is repeated again.

7. The method for adaptive parameter optimization and demagnetization of a miniaturized nuclear magnetic resonance gyroscope according to claim 5, characterized in that: After successfully completing the demagnetization operation, the host computer software saves the expected parameters and the residual magnetic field information after demagnetization, and optimizes the demagnetization current frequency, demagnetization current cycle number, demagnetization current initial amplitude, and demagnetization current envelope shape parameters to facilitate the subsequent setting of the host computer software.

8. The method for adaptive parameter optimization and demagnetization of a miniaturized nuclear magnetic resonance gyroscope according to claim 5, characterized in that: The degaussing current signal includes a DC component. The circuit switch is set to open circuit so that the degaussing current signal passes through the transformer and the DC component is filtered out.

9. The method for adaptive parameter optimization and demagnetization of a miniaturized nuclear magnetic resonance gyroscope according to claim 5, characterized in that: The pair of coils is a two-way switch.

10. The method for adaptive parameter optimization and demagnetization of a miniaturized nuclear magnetic resonance gyroscope according to claim 5, characterized in that: One end of the magnetometer is electrically connected to one end of the computer; the other end of the computer is electrically connected to one end of the signal generator, the other end of the signal generator is electrically connected to one end of the power amplifier, the other end of the power amplifier is electrically connected to one end of the circuit switch, the other end of the circuit switch is electrically connected to one end of the contact current sensor, the other end of the contact current sensor is electrically connected to one end of the AD module; the other end of the AD module is electrically connected to another end of the computer; another end of the contact current sensor is electrically connected to the pair of coils; and the circuit switch is connected in parallel with the transformer.

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