CN117347929A - A magnetic testing device and measurement method with controllable magnetic field angle - Google Patents

Abstract

The invention relates to the technical field of magnetic field measurement, in particular to a magnetic field controllable angle controllable magnetic test device and a magnetic field controllable angle controllable magnetic test method. The magnetic test apparatus includes: the magnetic shielding assembly is used for shielding the earth magnetic field and the external disturbance magnetic field, and the non-magnetic turntable assembly is used for driving the tested piece (7) to rotate; the non-magnetic turntable driver (5) and the non-magnetic turntable controller (6) of the non-magnetic turntable assembly are arranged outside the magnetic shielding assembly so as to avoid influencing the magnetic field in the magnetic shielding assembly; the nonmagnetic turntable driver (5) drives the nonmagnetic turntable object table (3) to rotate through the nonmagnetic turntable driving rod (4) under manual control or under the electric control of the nonmagnetic turntable controller (6), and a tested piece (7) arranged on the nonmagnetic turntable object table (3) rotates along with the nonmagnetic turntable object table (3). The invention has strong universality, is suitable for measuring any magnetic field related to the rotation angle, is not disturbed by an external magnetic field, and has high measurement accuracy.

Description

A magnetic testing device and measurement method with controllable magnetic field angle

Technical field

The invention relates to the technical field of magnetic field measurement, and in particular to a magnetic testing device and a measurement method with a controllable magnetic field angle.

Background technique

Magnetism is a basic property of matter, and magnetic field is the basic physical field that exists in space. It is a basic physical property that needs to be detected in many scientific researches. In the field of weak magnetic measurement, the impact of material magnetism on equipment is more obvious, and the testing technology for material magnetism is worthy of attention. The magnetometer or magnetometer is an important weak magnetic field measuring instrument. This article is collectively referred to as a magnetometer. In order to obtain more accurate magnetic field data, special attention should be paid to the zero point accuracy test of the vector magnetometer and the steering error test of the scalar magnetometer.

The invention application with application number 202011486922.X discloses a magnetic moment measurement device and method. This device needs to generate a background magnetic field of 200nT to 20,000nT in a magnetic shielding cylinder, and use a pump-detection atomic magnetometer to measure it. The magnetic moment of the sample to be measured is measured by manually or electronically controlling the displacement stage to slowly move linearly or stepwise in the direction parallel to the background magnetic field to increase the distance between the sample to be tested and the rubidium bubble.

However, the magnetic moment measurement device and method provided by the application number 202011486922. Work inside a shielded tube. Moreover, this invention application is for in-situ measurement of the magnetic moment of a magnetic sample. Therefore, it does not have the ability to rotate the magnetic sample. It cannot be used for testing the zero point accuracy of the vector magnetometer and the steering difference of the scalar magnetometer. The versatility is not strong. However, there is currently no standard calibration measuring instrument in China for performance testing such as zero-point accuracy of weak magnetic magnetometers.

Contents of the invention

The purpose of the present invention is to overcome the problems that the existing magnetic measurement device is not very versatile, cannot work in a magnetic shielding cylinder in a near-zero magnetic environment, and cannot perform zero-point accuracy measurements of vector magnetometers and steering difference tests of scalar magnetometers, thereby A magnetic testing device with controllable magnetic field angle is provided. The device provided by the invention can not only generate a magnetic field that covers the intensity of the earth's magnetic field, but also work in a near-zero magnetic environment in a shielding cylinder. It uses an angle-controllable non-magnetic turntable device to rotate the measured sample to perform any magnetic field measurement related to the rotation angle. , such as realizing material magnetic measurement, vector magnetometer zero point accuracy measurement, scalar magnetometer steering error measurement, and magnetometer range and linearity measurement.

In order to solve the above technical problems, the technical solution of the present invention provides a magnetic testing device with a controllable magnetic field and a controllable angle.

Including: magnetic shielding components and non-magnetic turntable components; among them,

The magnetic shielding assembly includes: a magnetic shielding cylinder 1 equipped with a magnetic shielding cylinder cover 2 for shielding the earth's magnetic field and external disturbing magnetic fields;

The non-magnetic turntable assembly includes: non-magnetic turntable stage 3, non-magnetic turntable drive rod 4, non-magnetic turntable driver 5 and non-magnetic turntable controller 6; wherein,

One end of the non-magnetic turntable driving rod 4 passes through the through hole on one side of the magnetic shielding tube 1 and enters the magnetic shielding tube 1, and is connected to the non-magnetic turntable stage 3, and the other end is connected to the non-magnetic turntable drive rod 4 arranged outside the magnetic shielding tube 1. Magnetic turntable drive 5 connections;

The non-magnetic turntable driver 5 and the non-magnetic turntable controller 6 are placed outside the magnetic shielding cylinder 1 to avoid affecting the magnetic field in the magnetic shielding cylinder 1; the non-magnetic turntable driver 5 is under manual control or without Under the electric control of the magnetic turntable controller 6, the non-magnetic turntable stage 3 is driven by the non-magnetic turntable drive rod 4 to rotate, and the tested piece 7 placed on the non-magnetic turntable stage 3 follows the non-magnetic turntable stage 3 Make a rotation.

As an improvement of the above device, the magnetic shielding cylinder 1 is provided with a through hole at a corresponding position in the center of the non-magnetic turntable stage 3, for allowing the test piece 7 to pass through the through hole and be fixed on the non-magnetic turntable stage 3. On the turntable stage 3.

As an improvement of the above device, the non-magnetic turntable driver 5 drives the non-magnetic turntable stage 3 through the non-magnetic turntable drive rod 4 under the manual control or the electric control of the non-magnetic turntable controller 6 for 360° full operation. rotate towards.

As an improvement of the above device, the magnetic testing device also includes: a monitoring magnetometer probe 12 placed inside the magnetic shielding cylinder 1; the monitoring magnetometer probe 12 is perpendicular to the axial direction of the non-magnetic turntable drive rod 4 The direction is set to monitor the magnetic field of the object under test 7; the connecting wire of the monitoring magnetometer probe 12 passes through the through hole of the magnetic shielding cylinder 1 and is connected to the monitoring magnetometer probe controller 13 provided outside the magnetic shielding cylinder 1.

As an improvement of the above device, the magnetic testing device also includes: a magnetic field generating element, which is placed inside the magnetic shielding cylinder 1 and used to provide a controllable artificial magnetic field; wherein,

The magnetic field generating element includes: a group of artificial magnetic field coils placed inside the magnetic shielding cylinder 1 or several groups of artificial magnetic field coils in different axial directions, wherein each group of artificial magnetic field coils includes: symmetrically arranged on the non-magnetic turntable stage 3 The first artificial magnetic field coil 8 and the second artificial magnetic field coil 9 on both sides are used to provide the controllable artificial magnetic field;

The first artificial magnetic field coil 8 and the second artificial magnetic field coil 9 are driven by an external current source 10 placed outside the magnetic shielding cylinder 1; the external current source 10 is driven by a through hole of the magnetic shielding cylinder 1. The wires are connected to the first artificial magnetic field coil 8 and the second artificial magnetic field coil 9 .

In order to provide another object of the present invention, the present invention also provides a method for measuring the magnetic moment of materials, which is implemented based on the above-mentioned magnetic testing device with a controllable magnetic field and a controllable angle. The method includes the following steps:

Fix the material to be tested at the center of the non-magnetic turntable stage 3;

Close the magnetic shielding cylinder cover 2 so that the magnetic shielding cylinder cover 2 and the magnetic shielding cylinder 1 shield the earth's magnetic field and external disturbing magnetic fields;

Rotate the non-magnetic turntable stage 3 so that the material to be tested rotates one 360° or continuously rotates multiple 360° with the non-magnetic turntable stage 3, and during the rotation of the non-magnetic turntable stage 3, At the same time, the monitoring magnetometer probe 12 is used to measure continuously changing magnetic field data;

The continuously changing magnetic field data within 360° or the average value of multiple continuously changing magnetic field data within 360° measured by the monitoring magnetometer probe 12 is regarded as the continuous magnetic field intensity B _M ; according to the continuous magnetic field intensity B _M The relationship between the change in the rotation angle and the distance L from the monitoring magnetometer probe 12 to the center of the material being measured is calculated to obtain the magnetic moment of the material being measured, which is used to evaluate the residual magnetism of the material being measured.

In order to provide another object of the present invention, the present invention also provides a method for measuring the zero point accuracy of a vector magnetometer, which is implemented based on the above-mentioned magnetic testing device with a controllable magnetic field and a controllable angle. The vector magnetometer includes: a measured magnetometer probe. 14 and the measured magnetometer controller 11; the method includes the following steps:

Pass the magnetometer probe 14 under test into the magnetic shielding cylinder through the through hole above the magnetic shielding cylinder 1, and fix it at the center of the non-magnetic turntable stage 3;

Close the magnetic shielding cylinder cover 2 so that the magnetic shielding cylinder cover 2 and the magnetic shielding cylinder 1 shield the earth's magnetic field and external disturbing magnetic fields;

Turn on the magnetometer controller 11 under test and the magnetometer probe 14 under test, so that the magnetometer probe 14 under test starts working based on the control of the magnetometer controller 11; set the non-magnetic turntable stage 3 to the initial position Set to the 0° position, record the magnetic field data B ₁ in any direction measured by the magnetometer probe 14 at the 0° position, and record this direction as the Y-axis direction;

Rotate the non-magnetic turntable stage 3, and the measured magnetometer probe 14 rotates 180° in the Y-axis direction along with the non-magnetic turntable stage 3. Record the position after the non-magnetic turntable stage 3 stops rotating. For the 180° position, record the magnetic field data B ₂ in the Y-axis direction measured by the magnetometer probe 14 at the 180° position;

The external current source 10 is set to multiple different current values. Driven by the external current source 10, the first artificial magnetic field coil 8 and the second artificial magnetic field coil of a group of artificial magnetic field coils in the Y-axis direction 9. Generate multiple stable magnetic fields B corresponding to the current value in the Y-axis direction, so that the measured magnetometer probe 14 works in each stable magnetic field B environment, rotate the non-magnetic turntable stage 3 and record each stable magnetic field B environment Below, the magnetic field data B ₁ in the Y-axis direction at the 0° position and the magnetic field data B ₂ in the Y-axis direction at the 180° position;

Using the plurality of magnetic field data B ₁ and the plurality of magnetic field data B ₂ measured by the magnetometer probe 14 under test, the corresponding Y-axis zero point accuracy ΔB of the vector magnetometer in each magnetic field environment is obtained, where ΔB = ( B ₁ +B ₂ )/2.

In order to provide another object of the present invention, the present invention also provides a method for measuring the steering difference of a scalar magnetometer, which is implemented based on the above-mentioned magnetic testing device with a controllable magnetic field and a controllable angle. The scalar magnetometer includes: a magnetometer probe 14 under test. and the measured magnetometer controller 11; the method includes the following steps:

Fix the magnetometer probe 14 under test at the center of the non-magnetic turntable stage 3;

Close the magnetic shielding cylinder cover 2 so that the magnetic shielding cylinder cover 2 and the magnetic shielding cylinder 1 shield the earth's magnetic field and external disturbing magnetic fields;

Turn on the current source 10 outside the cylinder, so that the first artificial magnetic field coil 8 and the second artificial magnetic field coil 9 of any group of artificial magnetic field coils are driven by the current source 10 outside the cylinder to generate a stable magnetic field B of 100 nT; turn on the magnetometer under test The controller 11 and the measured magnetometer probe 14 make the measured magnetometer probe 14 work based on the control of the measured magnetometer controller 11; set the initial position of the non-magnetic turntable stage 3 to the 0° position, and record 0 ° position, the measured magnetic field data B0 in any direction of the magnetometer probe 14, and record this direction as the Y-axis direction;

Rotate the non-magnetic turntable stage 3n different angles within 360° to obtain the magnetic field strengths Bn corresponding to the n angles respectively; based on the n magnetic field strengths Bn, obtain the 360° steering difference data of the scalar magnetometer.

In order to provide another object of the present invention, the present invention also provides a method for measuring the range and linearity of a magnetometer, which is implemented based on the above-mentioned magnetic testing device with a controllable magnetic field and a controllable angle. The magnetometer includes: a magnetometer probe 14 under test. and the measured magnetometer controller 11, the method includes the following steps:

Fix the magnetometer probe 14 under test at the center of the non-magnetic turntable stage 3;

Turn on the external current source 10 of the cylinder, so that the first artificial magnetic field coil 8 and the second artificial magnetic field coil 9 of any group of artificial magnetic field coils are driven by the external current source 10 of the cylinder to generate a stable magnetic field B';

The external current source 10 is set to generate different current values I ₁ , I ₂ , I ₃ ,... _In , which can be calculated through the coil coefficients of the first artificial magnetic field coil 8 and the second artificial magnetic field coil 9 Driven by corresponding currents, the magnetic field values B′ ₁ , B′ ₂ , B′ ₃ ,···B′ _n generated by the first artificial magnetic field coil 8 and the second artificial magnetic field coil 9 ;

Turn on the magnetometer controller 11 under test and the magnetometer probe 14 under test, so that the magnetometer probe 14 under test works based on the control of the magnetometer controller 11 under test, and record the magnetic field values B′ ₁ and B′ ₂ respectively, B′ ₃ ,····B′ _n environment, the corresponding magnetic field data B ₁ , B ₂ , B ₃ ,····B _n in any direction measured by the magnetometer probe 14 under test, and record the direction is the Y-axis direction;

According to the magnetic field values B′ ₁ , B′ ₂ , B′ ₃ ,····B′ _n generated by the first artificial magnetic field coil 8 and the second artificial magnetic field coil 9 and the corresponding magnetic field data measured by the measured magnetometer probe 14 B ₁ , B ₂ , B ₃ ,···B _n , draw the range and linearity of the magnetometer in the Y-axis direction.

The advantage of the present invention is that the magnetic testing device provided by the present invention with a controllable magnetic field angle and a controllable magnetic field shields the external magnetic field through the magnetic shielding assembly, so that the test is not disturbed by the external magnetic field, and drives the test piece to rotate through the non-magnetic turntable assembly. It is versatile. Strong, suitable for any magnetic field measurement application related to rotation angle, such as material magnetic measurement, vector magnetometer zero point accuracy measurement, scalar magnetometer steering difference measurement, and magnetometer range and linearity measurement; the magnetic field of the present invention is controllable When the angle-controllable magnetic testing device is used to test the magnetometer performance, the magnetometer probe 14 under test can pass through the through hole of the shielding cylinder 1 and be placed in the center of the non-magnetic turntable stage. According to the measurement axial requirements and the position of the rotating non-magnetic turntable stage, artificial magnetic field coils in different directions can be placed inside the shielding cylinder 1. The artificial magnetic field coil can provide the magnetic field required for testing under the driving of the current source 10 outside the cylinder. The rotating carrier In the direction of the object stage, the zero point accuracy test of the vector magnetometer and the steering difference test of the scalar magnetometer can be carried out.

Description of drawings

Figure 1 is a first side view of the structure of a magnetic testing device with controllable magnetic field angle;

Figure 2 is a side view of a device used to measure the magnetism of materials;

Figure 3 is a top view of a device used to measure the magnetism of materials;

Figure 4(a) is a side view of the device used to measure the accuracy of the magnetometer;

Figure 4(b) is a top view of the device used to measure the accuracy of the magnetometer;

Figure 5 is a set of vector magnetometer zero point accuracy measurement data.

Drawing identification

1. Magnetic shielding tube 2. Magnetic shielding tube cover 3. Non-magnetic turntable stage

4. Non-magnetic turntable drive rod 5. Non-magnetic turntable driver 6. Non-magnetic turntable controller

7. The object under test 8. The first artificial magnetic field coil 9. The second artificial magnetic field coil

10. External current source 11. Controller of the magnetometer under test 12. Monitoring magnetometer probe

13 Monitoring magnetometer controller 14. Magnetometer probe under test

Detailed ways

The technical solutions provided by the present invention will be further described below with reference to examples.

The magnetic testing device proposed by the present invention mainly includes a magnetic shielding cylinder and a non-magnetic turntable.

The magnetic shielding cylinder is used to shield the earth's magnetic field and external disturbing magnetic fields, so that the inside of the cylinder is in a near-zero magnetic environment. The magnetic shielding cylinder is equipped with a magnetic shielding cylinder cover. After closing the magnetic shielding cylinder cover, the non-magnetic turntable stage can freely rotate 360° in all directions under the action of the controller.

The driver and controller of the non-magnetic turntable are placed outside the magnetic shielding cylinder to control the rotation of the driving rod to avoid affecting the magnetic field inside the cylinder. The driving rod of the non-magnetic turntable passes through the through hole below the magnetic shielding cylinder and enters the magnetic shielding cylinder, and a stage is fixed on the top for placing and fixing the test piece. The length of the driving rod can be adjusted so that the object under test is located in the center of the magnetic shielding cylinder, ensuring that the object under test is placed in a uniform magnetic field area within the cylinder.

When using this device to measure the magnetic properties of materials, a monitoring magnetometer probe 12 can be fixed in a direction perpendicular to the rotation axis to measure and collect magnetic field data. The magnetic moment of the material in that direction can be obtained by continuously rotating the material 360°.

The magnetic testing device and measurement method with a controllable magnetic field angle and a controllable magnetic field proposed by the present invention will be further described below with reference to the drawings of specific embodiments of the present invention.

Example 1

A magnetic testing device with controllable magnetic field and angle,

As shown in Figure 1, the magnetic testing device includes: a magnetic shielding component and a non-magnetic turntable component; wherein,

The magnetic shielding assembly includes: a magnetic shielding cylinder 1 equipped with a magnetic shielding cylinder cover 2 for shielding the earth's magnetic field and external disturbing magnetic fields;

The non-magnetic turntable assembly includes: non-magnetic turntable stage 3, non-magnetic turntable drive rod 4, non-magnetic turntable driver 5 and non-magnetic turntable controller 6; wherein,

One end of the non-magnetic turntable driving rod 4 passes through the through hole on one side of the magnetic shielding tube 1 and enters the magnetic shielding tube 1, and is connected to the non-magnetic turntable stage 3, and the other end is connected to the non-magnetic turntable drive rod 4 arranged outside the magnetic shielding tube 1. Magnetic turntable drive 5 connections.

The magnetic shielding cylinder 1 and the non-magnetic turntable system are placed on the ground. The magnetic shielding cylinder 1 is equipped with a magnetic shielding cylinder cover 2. After the cylinder cover is closed, it can be used to shield the earth's magnetic field. The non-magnetic turntable driver 5 and the non-magnetic turntable controller 6 are placed outside the magnetic shielding cylinder to avoid affecting the magnetic field inside the cylinder. The non-magnetic turntable drive rod 4 is inserted through the through hole below the magnetic shielding tube, and a non-magnetic turntable stage 3 is fixed above. The non-magnetic turntable driver 5 drives the non-magnetic turntable stage 3 to rotate through the non-magnetic turntable drive rod 4 under the manual control or the electric control of the non-magnetic turntable controller 6; the magnetic shielding cylinder 1 is in the non-magnetic state. A through hole is provided at a corresponding center position of the turntable stage 3 for allowing the object 7 to be tested to pass through the through hole and be fixed on the non-magnetic turntable stage 3 . When testing using this device, the object under test 7 can be fixedly placed in the center of the stage 3 and rotated with the stage.

Preferably, the non-magnetic turntable driver 5 drives the non-magnetic turntable stage 3 to perform 360° omnidirectional rotation through the non-magnetic turntable drive rod 4 under manual manual control or electric control of the non-magnetic turntable controller 6 .

Preferably, as shown in Figures 2 and 3, the magnetic testing device further includes: a monitoring magnetometer probe 12 placed inside the magnetic shielding cylinder 1; the monitoring magnetometer probe 12 is perpendicular to the non-magnetic turntable drive rod. 4 is arranged in the axial direction for monitoring the magnetic field of the object under test 7; the connecting wire of the monitoring magnetometer probe 12 passes through the through hole of the magnetic shielding cylinder 1 and is controlled by the monitoring magnetometer probe arranged outside the magnetic shielding cylinder 1 13 is connected. When measuring the magnetic properties of materials, the monitoring magnetometer probe 12 is inserted through the through hole on one side and fixed in a direction perpendicular to the rotation axis of the non-magnetic turntable.

Preferably, the magnetic testing device further includes: a magnetic field generating element placed inside the magnetic shielding cylinder 1 for providing a controllable artificial magnetic field; wherein the magnetic field generating element includes: placed inside a magnetic field A group of artificial magnetic field coils or several groups of artificial magnetic field coils in different axial directions inside the shielding cylinder 1. Each group of artificial magnetic field coils includes: a first artificial magnetic field coil 8 symmetrically arranged on both sides of the non-magnetic turntable stage 3 and The second artificial magnetic field coil 9 is used to provide the controllable artificial magnetic field; the first artificial magnetic field coil 8 and the second artificial magnetic field coil 9 are driven by an external current source 10 placed outside the magnetic shielding cylinder 1; The external current source 10 is connected to the first artificial magnetic field coil 8 and the second artificial magnetic field coil 9 using wires passing through the through holes of the magnetic shielding cylinder 1 .

When measuring the zero point accuracy of the magnetometer and the steering difference, the first artificial magnetic field coil 8 and the second artificial magnetic field coil 9 with different axial directions can be placed to generate the required magnetic field of stable size driven by the current source outside the cylinder.

Example 2:

This embodiment provides a method for measuring the magnetic moment of a material, which is implemented through a magnetic testing device with a controllable magnetic field and a controllable angle as shown in FIG. 3 .

Fix the material to be measured 7 in the center of the non-magnetic turntable stage 3, close the magnetic shielding cylinder cover 2, so that the magnetic shielding cylinder cover 2 and the magnetic shielding cylinder 1 shield the earth's magnetic field and the external disturbance magnetic field;

As shown in Figure 3, the driving rod is placed in the Z-axis direction, a monitoring magnetometer probe 12 is fixed on the XOY plane for magnetic field monitoring, and the non-magnetic turntable stage 3 is rotated so that the tested material is carried along with the non-magnetic turntable. The object stage 3 rotates one 360° or continuously rotates multiple 360°, and during the rotation of the non-magnetic turntable stage 3, the monitoring magnetometer probe 12 is used to measure continuously changing magnetic field data;

Using the continuous magnetic field data measured by the monitoring magnetometer probe 12 (which can be continuously rotated multiple times to calculate the average value), based on the relationship between the change of the magnetic field strength B _M with the angle and the distance L, the magnetic moment of the material being measured can be calculated, Evaluate the residual magnetism of the material being tested.

Specifically, the continuously changing magnetic field data within one 360° or the average value of multiple continuously changing magnetic field data within 360° measured by the monitoring magnetometer probe 12 is used as the continuous magnetic field intensity B _M ; according to the continuous magnetic field intensity The relationship between the change of B _M with the rotation angle and the distance L from the monitoring magnetometer probe 12 to the center of the material to be measured is calculated to obtain the magnetic moment of the material to be measured, which is used to evaluate the residual magnetism of the material to be measured.

Example 3:

This embodiment provides a method for measuring the zero point accuracy of a vector magnetometer, which is implemented through a magnetic testing device with a controllable magnetic field and a controllable angle as shown in Figure 4(a) and Figure 4(b). The vector magnetometer includes: a measured magnetometer probe 14 and a measured magnetometer controller 11; the method includes the following steps:

Insert the magnetometer probe 14 under test into the magnetic shielding cylinder 1 through the through hole above the magnetic shielding cylinder 1, and fix it in the center of the non-magnetic turntable stage 3. Close the magnetic shielding cylinder cover 2 so that the magnetic shielding cylinder cover 2 is in contact with the magnetic shielding cylinder 1. The magnetic shielding cylinder 1 shields the earth's magnetic field and external disturbing magnetic fields;

In the initial position, the controller 11 of the magnetometer under test controls the magnetometer probe 14 under test to start working. There is a certain amount of residual magnetism in the magnetic shielding cylinder 1, and the initial position of the non-magnetic turntable stage 3 is recorded as the 0° position. Record the magnetic field data B ₁ in the Y-axis direction measured by the magnetometer probe 14 at the 0° position. There is a certain amount of residual magnetism in the magnetic shielding cylinder. In this method, the artificial magnetic field coil is not used to apply an external magnetic field.

Rotate the non-magnetic turntable stage 3, control the non-magnetic turntable stage 3 to rotate 180° on the XOY plane, that is, in the Y-axis direction, and record the position after stopping the rotation as the 180° position. Record the magnetic field data B ₂ in the Y-axis direction measured by the magnetometer probe 14 at the 180° position.

The first artificial magnetic field coil 8 and the second artificial magnetic field coil 9 are placed in the Y-axis direction inside the magnetic shielding cylinder 1. Driven by the current source 10 outside the cylinder, the first artificial magnetic field coil 8 and the second artificial magnetic field coil 9 produce stable Y-direction Magnetic field B. The external current source 10 is set to different current values, so that the measured magnetometer probe 14 works in different magnetic field environments, rotates the non-magnetic turntable stage 3 and records multiple sets of Y-axis magnetic field data at the 0° position and the 180° position. B ₁ and B ₂ . By sorting the data, the Y-axis magnetic field measured by the measured magnetometer probe 14 can be obtained when the non-magnetic turntable stage 3 rotates from the 0° position to the 180° position under a certain magnetic field environment as shown in Figure 5.

Using the magnetic field data measured by the magnetometer probe 14 under test, the Y-axis zero point accuracy ΔB of the magnetometer probe 14 under test is obtained, where ΔB=(B ₁ +B ₂ )/2. In practical applications, as a preferred embodiment, the non-magnetic turntable stage 3 is rotated at different angles or single-axis, dual-axis and three-axis artificial magnetic field coils are placed to measure the zero point accuracy of the magnetometer in different axes.

Example 4:

This embodiment provides a method for measuring the steering difference of a scalar magnetometer, which is implemented through a magnetic testing device with a controllable magnetic field and a controllable angle as shown in Figure 4(a) and Figure 4(b). The scalar magnetometer includes: a measured magnetometer probe 14 and a measured magnetometer controller 11; the method includes the following steps:

The magnetometer probe 14 under test is inserted into the magnetic shielding cylinder 1 through the through hole on the top of the magnetic shielding cylinder 1 and fixed in the center of the non-magnetic turntable stage 3 .

This embodiment is used to measure the steering difference in the Y-axis direction of the magnetometer. Place the first artificial magnetic field coil 8 and the second artificial magnetic field coil 9 in the Y-axis direction of the cylinder, close the magnetic shielding cylinder cover 2, and make the magnetic shielding cylinder cover 2 and The magnetic shielding cylinder 1 shields the earth's magnetic field and external disturbing magnetic fields;

Driven by the current source 10 outside the cylinder, the first artificial magnetic field coil 8 and the second artificial magnetic field coil 9 generate a stable magnetic field B of 100 nT in the Y direction.

In the initial position, the controller 11 of the magnetometer under test controls the magnetometer probe 14 under test to start working. Record the initial position as the 0° position, and record the magnetic field data B0 in the Y-axis direction measured by the magnetometer probe 14 at the 0° position;

By rotating the non-magnetic turntable stage 3 sequentially at n different angles within 360°, the corresponding magnetic field strengths Bn at different angles can be obtained. Rotate 360°, and based on n magnetic field strengths Bn, the steering difference data of 360° detected by the magnetometer under test can be obtained.

In practical applications, as a preferred embodiment, the non-magnetic turntable stage 3 is rotated at different angles or single-axis, dual-axis or three-axis artificial magnetic field coils are placed to measure the steering difference in different axial directions of the magnetometer.

Example 5:

This embodiment provides a method for measuring the range and linearity of a magnetometer, which is implemented through a magnetic testing device with a controllable magnetic field and a controllable angle as shown in Figure 4(a) and Figure 4(b). The magnetometer includes: a measured magnetometer probe 14 and a measured magnetometer controller 11. The method includes the following steps:

The magnetometer probe 14 under test is inserted into the magnetic shielding cylinder 1 through the through hole on the top of the magnetic shielding cylinder 1 and fixed in the center of the non-magnetic turntable stage 3 . Place the first artificial magnetic field coil 8 and the second artificial magnetic field coil 9 in the Y-axis direction inside the cylinder, and close the magnetic shielding cylinder cover 2. The external current source 10 is used to drive the first artificial magnetic field coil 8 and the second artificial magnetic field coil 9 to generate a stable magnetic field B'.

The external current source 10 of the cylinder is set to different current values I ₁ , I ₂ , I ₃ ,··· _In The magnetic field sizes generated by the first artificial magnetic field coil 8 and the second artificial magnetic field coil 9 on the Y-axis are B′ ₁ , B′ ₂ , B′ ₃ ,···B′ _n . Under the control of the magnetometer controller 11, the measured magnetometer probe 14 starts to work, and records the magnetic field data B ₁ , B ₂ , B ₃ ,···B _n measured by the measured magnetometer probe 14 under different magnetic field environments. ,

Based on the measured multiple sets of experimental data, draw the range and linearity of the magnetometer probe 14 under test in the Y-axis direction.

In this embodiment, a set of first artificial magnetic field coils 8 and second artificial magnetic field coils 9 are placed on the Y axis. In practical applications, as a preferred embodiment, the non-magnetic turntable stage 3 is rotated at different angles or single-axis, dual-axis or three-axis artificial magnetic field coils are placed to measure the range and linearity of the magnetometer in different axes.

It can be seen from the above detailed description of the present invention that the magnetic testing device provided by the present invention with a controllable magnetic field angle and a controllable magnetic field shields the external magnetic field through the magnetic shielding assembly, so that the test is not disturbed by the external magnetic field, and drives the test piece through the non-magnetic turntable assembly. Rotate, has strong versatility, and is suitable for any magnetic field measurement application related to rotation angle, such as material magnetic measurement, vector magnetometer zero point accuracy measurement, scalar magnetometer steering difference measurement, and magnetometer range and linearity measurement; use this When the invented magnetic testing device with controllable magnetic field and angle is used to test the performance of the magnetometer, the magnetometer probe 14 under test can be placed in the center of the non-magnetic turntable stage through the through hole above the shielding tube 1 . According to the measurement axial requirements and the position of the rotating non-magnetic turntable stage, artificial magnetic field coils in different directions can be placed in the center of the shielding cylinder 1. The artificial magnetic field coil can provide the magnetic field required for testing under the driving of the current source 10 outside the cylinder. The rotating carrier The direction of the object stage can be used to test the zero point accuracy of the vector magnetometer and the steering difference test of the scalar magnetometer.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art will understand that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and they shall all be covered by the scope of the present invention. within the scope of the claims.

Claims (9)

1. A magnetic testing device with a controllable magnetic field and a controllable angle, characterized in that the magnetic testing device includes: a magnetic shielding component and a non-magnetic turntable component; wherein, The magnetic shielding assembly includes: a magnetic shielding cylinder (1) equipped with a magnetic shielding cylinder cover (2), used to shield the earth's magnetic field and external disturbing magnetic fields; The non-magnetic turntable assembly includes: a non-magnetic turntable stage (3), a non-magnetic turntable drive rod (4), a non-magnetic turntable driver (5) and a non-magnetic turntable controller (6); wherein, One end of the non-magnetic turntable driving rod (4) passes through the through hole on one side of the magnetic shielding tube (1), enters the magnetic shielding tube (1), and is connected to the non-magnetic turntable stage (3), and the other end is connected to the magnetic shielding tube (1). The non-magnetic turntable driver (5) outside the shielding barrel (1) is connected; The non-magnetic turntable driver (5) and the non-magnetic turntable controller (6) are placed outside the magnetic shielding cylinder (1) to avoid affecting the magnetic field in the magnetic shielding cylinder (1); the non-magnetic turntable driver (6) (5) Under manual control or electric control of the non-magnetic turntable controller (6), the non-magnetic turntable stage (3) is driven to rotate through the non-magnetic turntable drive rod (4), and the non-magnetic turntable stage (3) is placed on the non-magnetic turntable. The object under test (7) on the stage (3) rotates with the non-magnetic turntable stage (3). 2. The magnetic testing device with controllable magnetic field and angle according to claim 1, characterized in that the magnetic shielding tube (1) is provided with a through hole at a corresponding center position of the non-magnetic turntable stage (3). , used to pass the test piece (7) through the through hole and fix it on the non-magnetic turntable stage (3). 3. The magnetic testing device with controllable magnetic field and angle according to claim 2, characterized in that the non-magnetic turntable driver (5) is under manual control or under the electric control of the non-magnetic turntable controller (6). , the non-magnetic turntable drive rod (4) drives the non-magnetic turntable stage (3) to perform 360° omnidirectional rotation. 4. The magnetic testing device with controllable magnetic field angle and controllable magnetic field angle according to claim 3, characterized in that the magnetic testing device further includes: a monitoring magnetometer probe (12) placed inside the magnetic shielding cylinder (1); The monitoring magnetometer probe (12) is arranged perpendicular to the axial direction of the non-magnetic turntable drive rod (4) and is used to monitor the magnetic field of the measured object (7); the connection of the monitoring magnetometer probe (12) The wire passes through the through hole of the magnetic shielding cylinder (1) and is connected to the monitoring magnetometer probe controller (13) provided outside the magnetic shielding cylinder (1). 5. A magnetic testing device with controllable magnetic field angle according to claim 3, characterized in that the magnetic testing device further includes: a magnetic field generating element, the magnetic field generating element is placed in the magnetic shielding cylinder (1) Internal, used to provide a controllable artificial magnetic field; where, The magnetic field generating element includes: a group of artificial magnetic field coils placed inside the magnetic shielding cylinder (1) or several groups of artificial magnetic field coils in different axial directions, wherein each group of artificial magnetic field coils includes: a set of artificial magnetic field coils placed symmetrically on a non-magnetic turntable. The first artificial magnetic field coil (8) and the second artificial magnetic field coil (9) on both sides of the table (3) are used to provide the controllable artificial magnetic field; The first artificial magnetic field coil (8) and the second artificial magnetic field coil (9) are driven by an external current source (10) placed outside the magnetic shielding cylinder (1); the external current source (10) The first artificial magnetic field coil (8) and the second artificial magnetic field coil (9) are connected by wires passing through the through holes of the magnetic shielding tube (1). 6. A method for measuring the magnetic moment of materials, implemented based on the magnetic testing device with controllable magnetic field angle and controllable angle according to claim 4, the method comprising the following steps: Fix the material to be tested at the center of the non-magnetic turntable stage (3); Close the magnetic shielding cylinder cover (2) so that the magnetic shielding cylinder cover (2) and the magnetic shielding cylinder (1) shield the earth's magnetic field and external disturbing magnetic fields; Rotate the non-magnetic turntable stage (3), so that the material to be tested rotates one 360° or continuously rotates multiple 360° with the non-magnetic turntable stage (3), and is placed on the non-magnetic turntable stage (3). 3) During the rotation process, the monitoring magnetometer probe (12) is used to measure continuously changing magnetic field data; The average value of one continuously changing magnetic field data within 360° or multiple continuously changing magnetic field data within 360° measured by the monitoring magnetometer probe (12) is regarded as the continuous magnetic field intensity B _M ; according to the continuous magnetic field intensity B The relationship between the change of _M with the rotation angle and the distance L from the monitoring magnetometer probe (12) to the center of the material to be measured is calculated to obtain the magnetic moment of the material to be measured, which is used to evaluate the residual magnetism of the material to be measured. 7. A method for measuring the zero point accuracy of a vector magnetometer, which is implemented based on the magnetic testing device with controllable magnetic field angle and controllable angle as claimed in claim 5. The vector magnetometer includes: a magnetometer probe to be measured (14) and a magnetic force to be measured. Instrument controller (11); the method includes the following steps: Insert the magnetometer probe (14) under test into the magnetic shielding cylinder through the through hole above the magnetic shielding cylinder (1), and fix it in the center of the non-magnetic turntable stage (3); Close the magnetic shielding cylinder cover (2) so that the magnetic shielding cylinder cover (2) and the magnetic shielding cylinder (1) shield the earth's magnetic field and external disturbing magnetic fields; Open the measured magnetometer controller (11) and the measured magnetometer probe (14), so that the measured magnetometer probe (14) starts to work based on the control of the measured magnetometer controller (11); The initial position of the magnetic turntable stage (3) is set to the 0° position, and the magnetic field data B ₁ in any direction measured by the measured magnetometer probe (14) at the 0° position is recorded, and this direction is recorded as the Y-axis direction; Rotate the non-magnetic turntable stage (3), the measured magnetometer probe (14) rotates 180° in the Y-axis direction along with the non-magnetic turntable stage (3), and move the non-magnetic turntable stage (3) 3) The position after stopping the rotation is recorded as the 180° position, and the magnetic field data B ₂ in the Y-axis direction measured by the measured magnetometer probe (14) at the 180° position is recorded; The external current source (10) of the cylinder is set with multiple different current values. Driven by the external current source (10), the first artificial magnetic field coil (8) of a group of artificial magnetic field coils in the Y-axis direction and the second artificial magnetic field coil (9) to generate multiple stable magnetic fields B corresponding to the current value in the Y-axis direction, so that the measured magnetometer probe (14) works in each stable magnetic field B environment to rotate the non-magnetic turntable load Stage (3) and record the magnetic field data B 1 in the Y-axis direction at the 0° position and the magnetic field data B ₂ in the Y-axis direction at the 180° position in each stable magnetic field B environment _; Using the multiple magnetic field data B ₁ and the multiple magnetic field data B ₂ measured by the measured magnetometer probe (14), the Y-axis zero point accuracy ΔB corresponding to the vector magnetometer in each magnetic field environment is obtained, where, ΔB =(B ₁ +B ₂ )/2. 8. A method for measuring the steering difference of a scalar magnetometer, which is implemented based on the magnetic testing device with controllable magnetic field angle and controllable angle as claimed in claim 5. The scalar magnetometer includes: a magnetometer probe (14) under test and a magnetometer under test. Controller (11); the method includes the following steps: Fix the magnetometer probe (14) under test at the center of the non-magnetic turntable stage (3); Close the magnetic shielding cylinder cover (2) so that the magnetic shielding cylinder cover (2) and the magnetic shielding cylinder (1) shield the earth's magnetic field and external disturbing magnetic fields; Turn on the current source outside the cylinder (10), so that the first artificial magnetic field coil (8) and the second artificial magnetic field coil (9) of any group of artificial magnetic field coils are driven by the current source outside the cylinder (10) to generate a stable voltage of 100nT. Magnetic field B; turn on the measured magnetometer controller (11) and the measured magnetometer probe (14), so that the measured magnetometer probe (14) works based on the control of the measured magnetometer controller (11); The initial position of the magnetic turntable stage (3) is set to the 0° position. At the 0° position, the magnetic field data B0 in any direction of the measured magnetometer probe (14) is recorded, and this direction is recorded as the Y-axis direction; Rotate the non-magnetic turntable stage (3) at n different angles within 360° to obtain the magnetic field strengths Bn corresponding to the n angles; based on the n magnetic field strengths Bn, obtain the 360° steering difference data of the scalar magnetometer . 9. A method for measuring the range and linearity of a magnetometer, implemented based on the magnetic testing device with controllable magnetic field angle and controllable angle according to claim 5. The magnetometer includes: a magnetometer probe (14) under test and a magnetometer under test. Controller (11), the method includes the following steps: Fix the magnetometer probe (14) under test at the center of the non-magnetic turntable stage (3); Turn on the current source outside the cylinder (10), so that the first artificial magnetic field coil (8) and the second artificial magnetic field coil (9) of any group of artificial magnetic field coils are driven by the current source outside the cylinder (10) to generate a stable magnetic field B '; The external current source (10) is set to generate different current values I ₁ , I ₂ , I ₃ , _... In through the first artificial magnetic field coil (8) and the second artificial magnetic field coil (9) Coil coefficient, calculate the magnetic field values B′ ₁ , B′ ₂ , B′ ₃ ,···B′ _n generated by the first artificial magnetic field coil (8) and the second artificial magnetic field coil (9) driven by the corresponding current. ; Open the measured magnetometer controller (11) and the measured magnetometer probe (14), make the measured magnetometer probe (14) work based on the control of the measured magnetometer controller (11), and record the magnetic field values respectively B′ ₁ , B′ ₂ , B′ ₃ ,····B′ _n environment, the corresponding magnetic field data B ₁ , B ₂ , B ₃ , in any direction measured by the magnetometer probe (14) under test,· ··B _n , and record this direction as the Y-axis direction; Measured according to the magnetic field values B′ ₁ , B′ ₂ , B′ ₃ ,····B′ _n generated by the first artificial magnetic field coil (8) and the second artificial magnetic field coil (9) and the measured magnetometer probe (14) Obtain the corresponding magnetic field data B ₁ , B ₂ , B ₃ ,···B _n , and draw the range and linearity of the magnetometer in the Y-axis direction.