Three-component moment-free coil magnetic field correction device, method and system

Abstract

The invention discloses a three-component moment-free coil magnetic field correction device, method and system, the three-component moment-free coil magnetic field correction device comprises a shielding cylinder, a three-axis rotation unit, a single-component magnetism measurement unit and an attitude control unit, the interior of the shielding cylinder is hollow, and the shielding cylinder is used for placing a three-component moment-free coil and shielding an external magnetic field; the three-axis rotating unit is arranged in the three-component torque-free coil, the single-component magnetism measuring unit is connected to the three-axis rotating unit, can rotate relative to the shielding cylinder and is used for obtaining a Z-axis magnetic field value, an X-axis magnetic field value and a Y-axis magnetic field value of the to-be-corrected coil respectively, and the attitude control unit is connected to the three-axis rotating unit and is used for controlling the single-component magnetism measuring unit to rotate relative to the shielding cylinder. The single-component magnetic measurement unit is controlled to rotate by a preset angle. The method can effectively solve the problem that the orthogonality of the three-axis torque-free coil produced according to a conventional mode needs to be corrected so that the three-axis torque-free coil can meet the qualified requirement.

Description

Technical Field

[0001] The present invention relates to the field of magnetic field measurement technology, and in particular to a three-component moment-free coil magnetic field correction device, method and system. Background Art

[0002] The orthogonality of a three-component magnetic sensor refers to the degree to which the three axes are perpendicular to each other. The smaller the value, the higher the accuracy. It is an important parameter that affects its measurement accuracy. Therefore, it is required that the three axes be perpendicular to each other as much as possible in the structure. Limited by the precision error of mechanical processing, the orthogonality of the three-axis moment-free coil produced by conventional methods is greater than 0.2°. Usually, the qualified orthogonality should meet the requirement of ≤0.1°. Therefore, the three-axis moment-free coil needs to be calibrated after mechanical processing to improve this performance indicator.

[0003] Therefore, there is an urgent need for a three-component moment-free coil magnetic field correction device, method and system to solve the problem in the prior art of needing to correct the orthogonality of the three-axis moment-free coil produced in a conventional manner to meet the qualification requirements. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose a three-component moment-free coil magnetic field correction device, method and system to solve the technical problem in the prior art that the orthogonality of the three-axis moment-free coil produced in a conventional manner needs to be corrected to meet the qualification requirements.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a three-component moment-free coil magnetic field correction device, comprising: The shielding tube is hollow inside and is used to place the three-component moment-free coil and shield the external magnetic field; A three-axis rotation unit, built into the three-component moment-free coil; a single-component magnetic measuring unit, connected to the three-axis rotation unit and capable of rotating relative to the shielding cylinder, for respectively obtaining the magnetic field value of the Z axis of the coil to be calibrated, the magnetic field value of the X axis of the coil to be calibrated, and the magnetic field value of the Y axis of the coil to be calibrated; and The posture control unit is connected to the three-axis rotation unit and is used to control the single-component magnetic measurement unit to rotate to a preset angle.

[0006] In a second aspect, the present invention provides a three-component moment-free coil magnetic field correction method, using the above-mentioned three-component moment-free coil magnetic field correction device, comprising the following steps: Obtain the Z-axis magnetic field value of the coil to be corrected, and determine the direction of the Z-axis coil according to the Z-axis magnetic field value; Obtain the X-axis magnetic field value of the coil to be corrected, and determine the direction of the X-axis coil according to the X-axis magnetic field value; Determining the direction of the Y-axis coil based on at least the direction of the Z-axis coil and the direction of the X-axis coil; The three-component moment-free coil is calibrated according to the direction of the Z-axis coil, the direction of the X-axis coil, and the direction of the Y-axis coil.

[0007] In some embodiments, obtaining the Z-axis magnetic field value of the coil to be corrected and determining the direction of the Z-axis coil according to the Z-axis magnetic field value includes: The magnetic field value of the Z axis is obtained by a single-component magnetic measurement unit.

[0008] In some embodiments, obtaining the Z-axis magnetic field value of the coil to be corrected and determining the direction of the Z-axis coil according to the Z-axis magnetic field value further includes: By making the direction measured by the single-component magnetic measuring unit roughly consistent with the direction of the Z-axis of the coil to be corrected, when the direction of the Z-axis coil of the coil to be corrected is adjusted, the magnetic field value measured by the single-component magnetic measuring unit changes. When the single-component magnetic measuring unit measures the maximum magnetic field value, the direction of the Z-axis coil is consistent with the direction measured by the single-component magnetic measuring unit at the maximum magnetic field value, and is calibrated as the first reference point.

[0009] In some embodiments, obtaining the X-axis magnetic field value of the coil to be calibrated and determining the direction of the X-axis coil according to the X-axis magnetic field value includes: The magnetic field value of the X-axis is obtained by the single-component magnetic measurement unit.

[0010] In some embodiments, obtaining the X-axis magnetic field value of the coil to be calibrated and determining the direction of the X-axis coil according to the X-axis magnetic field value further includes: By rotating the single-component magnetic measuring unit 90° relative to the first reference point, the direction measured by the single-component magnetic measuring unit is roughly consistent with the direction of the X-axis of the coil to be calibrated. When the direction of the X-axis coil of the coil to be calibrated is adjusted, the magnetic field value measured by the single-component magnetic measuring unit changes. When the single-component magnetic measuring unit measures the maximum magnetic field value, the direction of the X-axis coil is consistent with the direction measured by the single-component magnetic measuring unit at the maximum magnetic field value, and this is calibrated as the second reference point.

[0011] In some embodiments, determining the direction of the Y-axis coil based on at least the direction of the Z-axis coil and the direction of the X-axis coil includes: The magnetic field value of the Y axis is obtained by the single-component magnetic measuring unit.

[0012] In some embodiments, determining the direction of the Y-axis coil based on at least the direction of the Z-axis coil and the direction of the X-axis coil further includes: By rotating the single-component magnetic measuring unit 90° relative to the second reference point, the direction measured by the single-component magnetic measuring unit is roughly consistent with the direction of the Y-axis of the coil to be calibrated. When the direction of the Y-axis coil of the coil to be calibrated is adjusted, the magnetic field value measured by the single-component magnetic measuring unit changes. When the single-component magnetic measuring unit measures the maximum magnetic field value, the direction of the Y-axis coil is consistent with the direction measured by the single-component magnetic measuring unit at the maximum magnetic field value, and this is calibrated as the third reference point.

[0013] In some embodiments, calibrating the three-component moment-free coil according to the directions of the Z-axis coil, the X-axis coil, and the Y-axis coil includes: The directions of the Z-axis coil, the X-axis coil and the Y-axis coil of the three-component moment-free coil are calibrated according to the first reference point, the second reference point and the third reference point respectively.

[0014] In a third aspect, the present invention further provides a three-component moment-free coil magnetic field correction system, characterized in that it includes: A memory and a processor, wherein the memory stores executable instructions of the processor; The processor is configured to execute any one of the above three-component moment-free coil magnetic field correction methods by executing executable instructions of the processor.

[0015] Compared with the prior art, the three-component moment-free coil magnetic field correction device, method and system provided by the present invention have the following beneficial effects: The Z-axis magnetic field value of the coil to be corrected is obtained through a single-component magnetic measurement unit, and the direction of the Z-axis coil is determined based on the Z-axis magnetic field value. The X-axis magnetic field value of the coil to be corrected is then obtained, and the direction of the X-axis coil is determined based on the X-axis magnetic field value. The direction of the Y-axis coil is then determined based on at least the direction of the Z-axis coil and the direction of the X-axis coil. Finally, the three-component moment-free coil is corrected based on the direction of the Z-axis coil, the direction of the X-axis coil, and the direction of the Y-axis coil. Compared with the existing technology, by first determining the Z-axis magnetic field value of the coil to be corrected, then measuring and correcting the orthogonal value of the X-axis magnetic field value, and finally measuring and correcting the orthogonal value of the Y-axis magnetic field value, the orthogonal value of the magnetic field of the machined three-axis moment-free coil can be corrected, thereby reducing the use error of the three-axis moment-free coil magnetic field, facilitating production operations, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a flow chart of a three-component moment-free coil magnetic field correction method provided by an embodiment of the present invention; Figure 2 It is a structural diagram of the connection between a three-component moment-free coil provided by an embodiment of the present invention, a single-component magnetic measurement unit, a three-axis rotation unit, and a posture control unit.

[0017] Description of reference numerals: Three-component moment-free coil 10; single-component magnetometry unit 20; three-axis rotation unit 30; attitude control unit 40. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] In order to solve the technical problem of needing to correct the orthogonality of three-axis moment-free coils produced in a conventional manner to meet qualification requirements, the present invention provides a three-component moment-free coil magnetic field correction device, method and system, which can first determine the magnetic field value of the Z-axis of the coil to be corrected, then measure and correct the orthogonal value of the magnetic field value of the X-axis, and finally measure and correct the orthogonal value of the magnetic field value of the Y-axis, thereby correcting the orthogonal value of the magnetic field of the three-axis moment-free coil that has been machined, improving the use error of the three-axis moment-free coil magnetic field, facilitating production operations, and improving production efficiency.

[0020] It should be noted that the three-component moment-free coil magnetic field correction device, method and system described in the present invention are used for but not limited to the field of magnetic field measurement technology. For the convenience of explanation, in the present invention, only the three-component moment-free coil magnetic field correction device, method and system are applied to the field of magnetic field measurement technology as an example. The principles of the three-component moment-free coil magnetic field correction device, method and system applied to other types of equipment are essentially the same as those applied to the field of magnetic field measurement technology, and will not be elaborated here.

[0021] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of a three-component moment-free coil magnetic field correction device, method, and system according to an embodiment of the present invention. The three-component moment-free coil magnetic field correction method includes: Obtain the Z-axis magnetic field value of the coil to be corrected, and determine the direction of the Z-axis coil according to the Z-axis magnetic field value; Obtain the X-axis magnetic field value of the coil to be corrected, and determine the direction of the X-axis coil according to the X-axis magnetic field value; Determining the direction of the Y-axis coil based on at least the direction of the Z-axis coil and the direction of the X-axis coil; The three-component moment-free coil 10 is calibrated according to the direction of the Z-axis coil, the direction of the X-axis coil, and the direction of the Y-axis coil.

[0022] In this method, compared with the existing technology, the magnetic field value of the Z axis of the coil to be corrected is first determined, and then the magnetic field value of the X axis is measured and its orthogonal value is corrected, and finally the magnetic field value of the Y axis is measured and its orthogonal value is corrected, so that the orthogonal value of the magnetic field of the three-axis moment-free coil completed by mechanical processing can be corrected, thereby improving the use error of the magnetic field of the three-axis moment-free coil, facilitating production operations, and improving production efficiency.

[0023] In one embodiment, obtaining the Z-axis magnetic field value of the coil to be corrected and determining the direction of the Z-axis coil according to the Z-axis magnetic field value includes: The magnetic field value of the Z axis is obtained by the single-component magnetometry unit 20 .

[0024] By using the single-component magnetic measurement unit 20 to measure the Z-axis magnetic field value of the three-component moment-free coil 10 in real time, the change of the magnetic field value in different directions can be obtained, and the direction of the Z-axis coil can be determined based on the change or measurement assistance.

[0025] In one embodiment, obtaining the Z-axis magnetic field value of the coil to be corrected and determining the direction of the Z-axis coil according to the Z-axis magnetic field value further includes: By making the direction measured by the single-component magnetic measuring unit 20 roughly consistent with the direction of the Z-axis of the coil to be calibrated, when the direction of the Z-axis coil of the coil to be calibrated is adjusted, the magnetic field value measured by the single-component magnetic measuring unit 20 changes. When the single-component magnetic measuring unit 20 measures the maximum magnetic field value, the direction of the Z-axis coil is consistent with the direction measured by the single-component magnetic measuring unit 20 at the maximum magnetic field value, and is calibrated as the first reference point.

[0026] First, adjust the measuring direction of the single-component magnetic measuring unit 20 so that the measuring direction of the single-component magnetic measuring unit 20 is roughly consistent with the Z-axis direction of the moment-free coil; then adjust the direction of the Z-axis coil of the moment-free coil, and at the same time observe the magnetic field value of the single-component magnetic measuring unit 20. When the single-component magnetic measuring unit 20 displays the maximum magnetic field value, this is the direction of the Z-axis coil, and then fix it.

[0027] Furthermore, at this time, the direction of the coil Z axis is completely consistent with the direction of the maximum magnetic field value displayed by the single-component magnetic measuring unit 20, and the direction of the Z axis and the maximum magnetic field value displayed by the single-component magnetic measuring unit 20 at this time is used as the first reference point.

[0028] In one embodiment, obtaining the X-axis magnetic field value of the coil to be calibrated and determining the direction of the X-axis coil according to the X-axis magnetic field value includes: The magnetic field value of the X axis is obtained by the single-component magnetometry unit 20 .

[0029] By using the single-component magnetic measurement unit 20 to measure the X-axis magnetic field value of the three-component moment-free coil 10 in real time, the change of the magnetic field value in different directions can be obtained, and the direction of the X-axis coil can be determined based on the change or measurement.

[0030] In one embodiment, obtaining the X-axis magnetic field value of the coil to be corrected and determining the direction of the X-axis coil according to the X-axis magnetic field value further includes: By rotating the single-component magnetic measuring unit 20 90° relative to the first reference point, the direction measured by the single-component magnetic measuring unit 20 is roughly consistent with the direction of the X-axis of the coil to be calibrated. When the direction of the X-axis coil of the coil to be calibrated is adjusted, the magnetic field value measured by the single-component magnetic measuring unit 20 changes. When the single-component magnetic measuring unit 20 measures the maximum magnetic field value, the direction of the X-axis coil is consistent with the direction measured by the single-component magnetic measuring unit 20 at the maximum magnetic field value, and this is calibrated as the second reference point.

[0031] First, rotate the single-component magnetic measuring unit 20 by 90° in pitch angle relative to the first reference point, adjust the X-axis direction of the moment-free coil, and observe the magnetic field value of the single-component magnetic measuring unit 20 at the same time. When the single-component magnetic measuring unit 20 displays the maximum magnetic field value, this is the direction of the X-axis coil and fix it.

[0032] Furthermore, at this time, the direction of the coil X-axis is completely consistent with the direction of the maximum magnetic field value displayed by the single-component magnetic measuring unit 20, and the direction of the X-axis and the maximum magnetic field value displayed by the single-component magnetic measuring unit 20 at this time is used as the second reference point.

[0033] In one embodiment, determining the direction of the Y-axis coil based on at least the direction of the Z-axis coil and the direction of the X-axis coil includes: The magnetic field value of the Y axis is obtained by the single-component magnetometry unit 20 .

[0034] By using the single-component magnetic measurement unit 20 to measure the Y-axis magnetic field value of the three-component moment-free coil 10 in real time, the change of the magnetic field value in different directions can be obtained, and the direction of the Y-axis coil can be determined based on the change or measurement.

[0035] In one embodiment, determining the direction of the Y-axis coil based on at least the direction of the Z-axis coil and the direction of the X-axis coil further includes: By rotating the single-component magnetic measuring unit 20 90° relative to the second reference point, the direction measured by the single-component magnetic measuring unit 20 is roughly consistent with the direction of the Y-axis of the coil to be calibrated. When the direction of the Y-axis coil of the coil to be calibrated is adjusted, the magnetic field value measured by the single-component magnetic measuring unit 20 changes. When the single-component magnetic measuring unit 20 measures the maximum magnetic field value, the direction of the Y-axis coil is consistent with the direction measured by the single-component magnetic measuring unit 20 at the maximum magnetic field value, and this is calibrated as the third reference point.

[0036] First, rotate the single-component magnetic measuring unit 20 by 90° in pitch angle relative to the second reference point, adjust the Y-axis direction of the moment-free coil, and observe the magnetic field value of the single-component magnetic measuring unit 20 at the same time. When the single-component magnetic measuring unit 20 displays the maximum magnetic field value, this is the direction of the Y-axis coil and fix it.

[0037] Furthermore, at this time, the direction of the coil Y axis is completely consistent with the direction of the maximum magnetic field value displayed by the single-component magnetic measurement unit 20, and the direction of the Y axis and the maximum magnetic field value displayed by the single-component magnetic measurement unit 20 at this time is used as the third reference point.

[0038] In one embodiment, the directions of the Z-axis coil, the X-axis coil, and the Y-axis coil of the three-component moment-free coil 10 are calibrated according to the first reference point, the second reference point, and the third reference point, respectively.

[0039] By respectively determining the first reference point, the second reference point and the third reference point, they correspond to the directions of the Z-axis coil, the X-axis coil and the Y-axis coil of the three-component moment-free coil 10 .

[0040] In this embodiment, Figure 2 As shown, a three-component moment-free coil magnetic field correction device is also provided, comprising: Shielding tube, used to shield external magnetic field; The single-component magnetic measuring unit 20 is used to respectively obtain the magnetic field value of the Z axis of the coil to be corrected, the magnetic field value of the X axis of the coil to be corrected, and the magnetic field value of the Y axis of the coil to be corrected; A three-axis rotation unit 30 for rotating the single-component magnetometry unit 20; and The posture control unit 40 is used to control the three-axis rotation unit 30 to rotate at an angle of 90°.

[0041] In this example, the three-axis rotation unit 30 has a fixed part and a rotating platform. The calibrated three-axis moment-free coil is placed in a shielding tube, and then the fixed part of the three-axis rotation unit 30 is placed in the uniform area of the three-axis moment-free coil. Then, the posture control unit 40 and the single-component magnetic measurement unit 20 are fixed on the rotating platform of the three-axis rotation unit 30. Then, the three-component moment-free coil is connected to a current source, and the three-axis rotation unit 30 and the posture control unit 40 are connected to the power supply and communication lines, thereby completing the construction of the calibration environment.

[0042] Furthermore, the posture control unit 40 is used to control the rotation unit of the three-axis rotation unit 30 to rotate relative to its fixed part, thereby driving the single-component magnetic measurement unit 20 to rotate by a preset angle.

[0043] Furthermore, the shielding tube here is a common and easy-to-purchase device on the market, which can shield the external electromagnetic field, and its DC shielding coefficient is ≥60dB. The single-component magnetic measurement unit 20 is a single-component magnetometer that is common and easy to purchase on the market. The three-axis rotation unit 30 is a three-axis rotation table that is common and easy to purchase on the market, such as Wanming Technology WMD3. The attitude control unit 40 is a common and easy-to-purchase attitude meter on the market, such as Witt Intelligent HWT6053. The shielding tube, single-component magnetic measurement unit 20, three-axis rotation unit 30 and attitude control unit 40 here are all conventional settings known to technical personnel in this field, and will not be elaborated here.

[0044] In this embodiment, a three-component moment-free coil magnetic field correction system is further provided, characterized by comprising: A memory and a processor, wherein the memory stores executable instructions of the processor; The processor is configured to execute the above-mentioned three-component moment-free coil magnetic field correction method by executing executable instructions of the processor.

[0045] In the present invention, a computer program is stored in a memory, wherein the computer program is configured to execute the above method steps when executed. The memory may include, for example, a floppy disk, a CD, a DVD, a hard disk, a flash memory, a USB flash drive, a CF card, an SD card, an MMC card, a SM card, a Memory Stick, an XD card, etc.

[0046] The computer software product is stored in a memory and includes several instructions for enabling one or more computer devices (which may be personal computers, servers or other network devices, etc.) to execute all or part of the steps of the method of the present invention.

[0047] Compared with the prior art, the three-component moment-free coil magnetic field correction device, method and system provided by the present invention have the following beneficial effects: By obtaining the magnetic field value of the Z axis of the coil to be corrected, and determining the direction of the Z axis coil by the magnetic field value of the Z axis, then obtaining the magnetic field value of the X axis of the coil to be corrected, and determining the direction of the X axis coil by the magnetic field value of the X axis, then determining the direction of the Y axis coil according to at least the direction of the Z axis coil and the direction of the X axis coil, and finally correcting the three-component moment-free coil 10 according to the direction of the Z axis coil, the direction of the X axis coil and the direction of the Y axis coil. Compared with the prior art, by first determining the magnetic field value of the Z axis of the coil to be corrected, then measuring and correcting the orthogonal value of the magnetic field value of the X axis, and finally measuring and correcting the orthogonal value of the magnetic field value of the Y axis, the orthogonal value of the magnetic field of the three-axis moment-free coil completed by mechanical processing can be corrected, thereby improving the use error of the magnetic field of the three-axis moment-free coil, facilitating production operation, and improving production efficiency. The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made according to the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A three-component moment-free coil magnetic field correction device, characterized in that: include: The shielding tube is hollow inside and is used to place the three-component moment-free coil and shield the external magnetic field; A three-axis rotation unit, built into the three-component moment-free coil; a single-component magnetic measuring unit, connected to the three-axis rotation unit and capable of rotating relative to the shielding cylinder, for respectively obtaining the magnetic field value of the Z axis of the coil to be corrected, the magnetic field value of the X axis of the coil to be corrected, and the magnetic field value of the Y axis of the coil to be corrected; as well as The posture control unit is connected to the three-axis rotation unit and is used to control the single-component magnetic measurement unit to rotate to a preset angle.

2. A three-component moment-free coil magnetic field correction method, characterized in that: The three-component moment-free coil magnetic field correction device described in claim 1 comprises the following steps: Obtain the Z-axis magnetic field value of the coil to be corrected, and determine the direction of the Z-axis coil according to the Z-axis magnetic field value; Obtain the X-axis magnetic field value of the coil to be corrected, and determine the direction of the X-axis coil according to the X-axis magnetic field value; Determining the direction of the Y-axis coil based on at least the direction of the Z-axis coil and the direction of the X-axis coil; The three-component moment-free coil is calibrated according to the direction of the Z-axis coil, the direction of the X-axis coil, and the direction of the Y-axis coil.

3. The three-component moment-free coil magnetic field correction method according to claim 2, characterized in that: Obtaining the Z-axis magnetic field value of the coil to be corrected and determining the direction of the Z-axis coil by using the Z-axis magnetic field value includes: The magnetic field value of the Z axis is obtained by a single-component magnetic measurement unit.

4. The three-component moment-free coil magnetic field correction method according to claim 3, characterized in that: Obtaining the Z-axis magnetic field value of the coil to be corrected and determining the direction of the Z-axis coil by the Z-axis magnetic field value also includes: By making the direction measured by the single-component magnetic measuring unit roughly consistent with the direction of the Z-axis of the coil to be corrected, when the direction of the Z-axis coil of the coil to be corrected is adjusted, the magnetic field value measured by the single-component magnetic measuring unit changes. When the single-component magnetic measuring unit measures the maximum magnetic field value, the direction of the Z-axis coil is consistent with the direction measured by the single-component magnetic measuring unit at the maximum magnetic field value, and is calibrated as the first reference point.

5. The three-component moment-free coil magnetic field correction method according to claim 4, characterized in that: Obtaining the X-axis magnetic field value of the coil to be corrected and determining the direction of the X-axis coil by the X-axis magnetic field value includes: The magnetic field value of the X-axis is obtained by the single-component magnetic measurement unit.

6. The three-component moment-free coil magnetic field correction method according to claim 5, characterized in that: Obtaining the X-axis magnetic field value of the coil to be corrected and determining the direction of the X-axis coil by the X-axis magnetic field value also includes: By rotating the single-component magnetic measuring unit 90° relative to the first reference point, the direction measured by the single-component magnetic measuring unit is roughly consistent with the direction of the X-axis of the coil to be calibrated. When the direction of the X-axis coil of the coil to be calibrated is adjusted, the magnetic field value measured by the single-component magnetic measuring unit changes. When the single-component magnetic measuring unit measures the maximum magnetic field value, the direction of the X-axis coil is consistent with the direction measured by the single-component magnetic measuring unit at the maximum magnetic field value, and this is calibrated as the second reference point.

7. The three-component moment-free coil magnetic field correction method according to claim 6, characterized in that: Determining the direction of the Y-axis coil based on at least the direction of the Z-axis coil and the direction of the X-axis coil includes: The magnetic field value of the Y axis is obtained by the single-component magnetic measuring unit.

8. The three-component moment-free coil magnetic field correction method according to claim 7, characterized in that: Determining the direction of the Y-axis coil based on at least the direction of the Z-axis coil and the direction of the X-axis coil further includes: By rotating the single-component magnetic measuring unit 90° relative to the second reference point, the direction measured by the single-component magnetic measuring unit is roughly consistent with the direction of the Y-axis of the coil to be calibrated. When the direction of the Y-axis coil of the coil to be calibrated is adjusted, the magnetic field value measured by the single-component magnetic measuring unit changes. When the single-component magnetic measuring unit measures the maximum magnetic field value, the direction of the Y-axis coil is consistent with the direction measured by the single-component magnetic measuring unit at the maximum magnetic field value, and this is calibrated as the third reference point.

9. The three-component moment-free coil magnetic field calibration method according to claim 8, characterized in that: The three-component moment-free coil is calibrated according to the directions of the Z-axis coil, the X-axis coil, and the Y-axis coil, including: The directions of the Z-axis coil, the X-axis coil and the Y-axis coil of the three-component moment-free coil are calibrated according to the first reference point, the second reference point and the third reference point respectively.

10. A three-component moment-free coil magnetic field correction system, characterized in that: include: A memory and a processor, wherein the memory stores executable instructions of the processor; The processor is configured to execute the three-component moment-free coil magnetic field correction method according to any one of claims 2 to 9 by executing executable instructions of the processor.

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