Magnetic field measuring device and measuring method thereof

Abstract

The invention provides a magnetic field measuring device and a measuring method thereof.The magnetic field measuring device comprises a supporting part, a plurality of magnetic sensors and a sample table, the supporting part comprises a plurality of supporting strips, the first ends of the supporting strips are connected, the second ends of the supporting strips are connected, and each magnetic sensor is arranged at one end of a corresponding measuring arm; each supporting strip is provided with at least one measuring arm, the sample table is located within the range surrounded by the multiple magnetic sensors, and each magnetic sensor is provided with another magnetic sensor which is symmetrical with the sample table as the center. The measuring points of the magnetic field measuring device are symmetrically arranged in pairs, so that the asymmetry of a magnetic dipole moment magnetic field and the influence of a multi-magnetic dipole moment magnetic field can be reduced or eliminated, the distribution of the magnetic field around the object to be measured is comprehensively and finely captured, and the magnetic field measurement data is more accurate.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of magnetic environment testing, and particularly relates to a magnetic field measuring device and a measuring method thereof. Background Art

[0002] In order to meet various performance requirements, a certain amount of magnetic materials need to be used in a spacecraft and there is a certain magnetic moment. Space magnetic fields such as the Earth's or interstellar space magnetic fields will have a certain impact on the normal operation of the spacecraft, such as affecting the satellite attitude or the accuracy of satellite magnetic measurement instruments and the accuracy of other detection instruments. Therefore, it is necessary to measure the magnetic moment and perform magnetic compensation on the spacecraft in advance.

[0003] Currently, the indirect method is often used to calculate the magnetic moment. The indirect method measures the magnetic field distribution around the spacecraft or its single unit, and then uses mathematical analysis methods and optimization algorithms to calculate the magnetic moment of the object to be measured, such as the magnetic dipole method, spherical mapping method, equatorial mapping method, dynamic loop method, and near-field multi-magnetic dipole method, etc. The spherical mapping method and the equatorial mapping method usually characterize the magnetic properties of the spacecraft or its single unit using a magnetic dipole moment, assume that its geometric center is its magnetic core, arrange all magnetic sensors along a certain axis direction of the object to be measured, and then rotate the turntable at a fixed angle until it rotates a full circle to meet the requirement of comprehensively measuring the magnetic field distribution around the spacecraft or its single unit. Finally, the magnetic dipole moment of the spacecraft or its single unit is calculated according to the distance between the magnetic sensor and the spacecraft or its single unit. The magnetic dipole method for solving the magnetic dipole moment is also one of the important methods for characterizing the magnetic properties of the spacecraft or its single unit at present. The difference between this method and the spherical mapping method and the equatorial mapping method is that the latter uses a formula to calculate the magnetic dipole moment of the measured part, while the former uses optimization algorithms such as gradient descent to solve the magnetic dipole moment. Commonly used optimization algorithms include Newton gradient descent method, genetic algorithm, particle swarm algorithm, etc. Based on the dynamic loop method, the magnetic dipole moment of the spacecraft or its single unit can also be calculated. This method relies on a stable magnetic field environment, and the spacecraft or its single unit passes through five fluxgates at a constant speed to complete the magnetic field measurement. The fluxgate calculates the magnetic dipole moment of the measured part using the change of the magnetic field.

[0004] Current magnetic field measurement methods often assume that the geometric center of the object to be measured is its magnetic core, and arrange the magnetic sensors on a certain axis or a certain plane of the object to be measured. However, the actual position of the magnetic core usually deviates from the geometric center, resulting in that the traditional measurement method cannot provide accurate information for magnetic moment calculation or inversion, and the measured value is easily affected by the position of each measurement point and the magnetic core of the object to be measured, that is, the implicit increase in the influence of the measurement point weight is not conducive to the accuracy of magnetic field measurement. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a magnetic field measurement device and a measurement method thereof, which can reduce or eliminate the asymmetry of the magnetic dipole moment magnetic field and the influence of the multi-magnetic dipole moment magnetic field, comprehensively and finely capture the magnetic field distribution around it, and make the magnetic field measurement data more accurate.

[0006] In a first aspect, to solve the above technical problem, the present invention provides a magnetic field measurement device, including: a support part, the support part includes a plurality of support bars, the first ends of the support bars are connected to each other, and the second ends of the support bars are connected to each other; a plurality of magnetic sensors, each magnetic sensor is arranged at one end of a corresponding measurement arm; at least one measurement arm is provided on each support bar; a sample stage, the sample stage is located within the range surrounded by the plurality of magnetic sensors, and for each magnetic sensor, there is another magnetic sensor that is symmetric with respect to the sample stage as the center.

[0007] Optionally, the connection of the first ends of the support bars includes: the device includes a first chuck, a plurality of first slots are distributed on the first chuck, and the first ends of the support bars are respectively placed in the corresponding slots, and / or the connection of the second ends of the support bars includes: the device has a second chuck, a plurality of second slots are distributed on the second chuck, and the second ends of the support bars are respectively placed in the corresponding second slots.

[0008] Optionally, the support bar is an arc-shaped support bar or a semi-arc-shaped support bar.

[0009] Optionally, the measurement arm is connected to the support bar through a sliding retraction mechanism.

[0010] Optionally, the sliding retraction mechanism has a through hole, and the measurement arm passes through the through hole.

[0011] Optionally, a scale disk is configured on the first chuck and / or the second chuck and / or the sample stage.

[0012] Optionally, the support bar has a scale.

[0013] Optionally, a lifting part is connected to the bottom end of the sample stage.

[0014] Optionally, the number of the support bars is at least 4, and each support bar is at least connected to two measurement arms.

[0015] In a second aspect, the present invention provides a magnetic field measurement method, which is performed using the magnetic field measurement device as described in the first aspect, and includes: placing the object to be measured at the central position of the magnetic field measurement device, assigning a rectangular coordinate system to the object to be measured, with the origin passing through the geometric center of the object to be measured; fixing each magnetic sensor on the corresponding measurement arm, and connecting all the magnetic sensors to a multi-channel synchronous acquisition instrument; in a zero magnetic field environment, adjusting the object to be measured to a non-working state, and after the values of each magnetic sensor are stable, collecting the magnetic field intensity data sensed by each magnetic sensor; adjusting the object to be measured to a working state, and after the values of each magnetic sensor are stable, collecting the magnetic field intensity data sensed by each magnetic sensor.

[0016] Compared with the prior art, the present invention has the following advantages: The measurement points of the magnetic field measurement device are arranged symmetrically in pairs, which can reduce or eliminate the asymmetry of the magnetic dipole moment magnetic field and the influence of the multi-magnetic dipole moment magnetic field, comprehensively and finely capture the magnetic field distribution around it, and make the magnetic field measurement data more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are provided to provide a further understanding of the present application, and they are incorporated herein and constitute a part of the present application. The drawings illustrate embodiments of the present application and, together with the description herein, serve to explain the principles of the present application. In the drawings:

[0018] Figure 1 is a perspective view of a magnetic field measurement device according to an embodiment of the present invention;

[0019] Figure 2 is a front view of a magnetic field measurement device according to an embodiment of the present invention;

[0020] Figure 3 is a side view of a magnetic field measurement device according to an embodiment of the present invention;

[0021] Figure 4 is a top view of a magnetic field measurement device according to an embodiment of the present invention;

[0022] Figure 5 is a schematic flowchart of a test method for a magnetic field measurement device according to an embodiment of the present invention.

[0023] In the figures:

[0024] 10 - support part, 101 - support bar, 102 - first chuck, 103 - second chuck;

[0025] 20 - magnetic sensor;

[0026] 30 - measurement arm;

[0027] 40 - sample stage;

[0028] 50 - sliding retraction mechanism;

[0029] 60 - Scale plate;

[0030] 70 - Lifting part;

[0031] 80 - Base. Specific implementation manner

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, the present application can also be applied to other similar scenarios based on these drawings. Unless it is obvious from the language context or otherwise stated, the same reference numerals in the drawings represent the same structure or operation.

[0033] In the description of the present application, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present application and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the protection scope of the present application; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0034] In the present application, flowcharts are used to illustrate the operations performed according to the embodiments of the present application. It should be understood that the operations before or below do not necessarily need to be executed precisely in order. On the contrary, they can be executed in reverse order or simultaneously. At the same time, other operations can be added to these processes, or one or several steps of operations can be removed from these processes.

[0035] In conventional magnetic field measurement methods, for example, when calculating the magnetic dipole moment using the spherical mapping method and the equatorial mapping method, it is necessary to rotate the turntable at a fixed angle until it rotates a full circle to measure the magnetic field distribution around a spacecraft or its individual components. This will introduce additional errors, including the angular error of rotating the turntable and the measurement error caused by environmental magnetic field fluctuations, etc., which will have an adverse impact on the measurement and subsequent calculation results. At the same time, since it takes a certain amount of time for the turntable to rotate a full circle, the near-field measurement method is usually only applicable to measuring the static magnetic field of the object to be measured and cannot meet the requirements of measuring the dynamic magnetic field. In addition, both of these methods assume that the geometric center of the object to be measured is its magnetic core, and all magnetic sensors (such as magnetometers) are arranged in sequence along a certain axis direction of the object to be measured. Even if these methods can measure the magnetic field values around the object to be measured through the turntable, they are easily affected by the distance between the measurement point and the actual magnetic core of the object, and can only obtain partial magnetic induction intensity information around the object to be measured, unable to comprehensively and finely capture the magnetic field distribution around it, resulting in an obstacle to the work of magnetic moment inversion. The dynamic loop method is limited by the measurement process and is only applicable to measuring the static magnetic field of the object to be measured and cannot meet the requirements of measuring the dynamic magnetic field. This method is limited by the measurement principle and requires the environmental magnetic field to be relatively stable. Therefore, in the case of large magnetic field fluctuations during the day, additional magnetic field fluctuations will bring calculation errors to this method.

[0036] Although using an optimization algorithm to solve the multi-magnetic dipole moments of a spacecraft or its individual components can increase the number of magnetic moments in the calculation results and relatively accurately reflect the magnetic characteristics of the spacecraft or individual components, such methods still need to use a turntable for multiple measurements, which will also increase additional errors and cannot meet the synchronization requirements.

[0037] This embodiment provides a magnetic field measurement device that can synchronously, comprehensively, and finely measure the magnetic field distribution around a spacecraft or individual components without the need for a turntable, providing richer and more accurate data for using an optimization algorithm to solve the multi-magnetic dipole moments of a spacecraft or its individual components.

[0038] Refer to Figures 1 to 4 As shown, the magnetic field measurement device of this embodiment mainly includes: a support part 10, a plurality of magnetic sensors 20, and a sample stage 40. The support part 10 includes a plurality of support bars 101. The first ends of the support bars 101 are connected to each other, and the second ends of the support bars 101 are connected to each other. Each magnetic sensor 20 is arranged at one end of a corresponding measurement arm 30, and each support bar 101 has at least one measurement arm 20. The sample stage 40 is located within the range surrounded by the plurality of magnetic sensors 20, and for each magnetic sensor 20, there is another magnetic sensor 20 that is symmetric with respect to the sample stage 40.

[0039] A magnetic sensor 20, such as a three-axis fluxgate sensor, is a device sensitive to an external magnetic field. It obtains information about the external magnetic field by generating an electromotive force proportional to the external magnetic field on a coil, and can obtain information about the three components of the magnetic induction intensity of the external magnetic field at the magnetic sensor. In the device of this embodiment, a plurality of magnetic sensors 20 are fixed to a support portion 10 for measuring the magnetic field distribution of a to-be-measured object within the support portion 10. Specifically, one magnetic sensor 20 can be fixed to each support bar 101 of the support portion 10. In addition, in one implementation manner, a measuring arm 30 can be connected to the support bar 101 through a sliding retraction mechanism 50. The sliding retraction mechanism 50 has a through hole (not shown in the figure), and the measuring arm 30 passes through the through hole. With the above structure, the sliding retraction mechanism 50 can slide along the support bar 101, changing the position of the sliding retraction mechanism 50 on the support bar 101. On the other hand, it can also change the position of the measuring arm 30 in the through hole of the sliding retraction mechanism 50, so that the magnetic sensor 20 located on the measuring arm 30 has at least two-dimensional position adjustment, thereby greatly increasing the measurement range of this magnetic field measurement device. In addition, through the above movable structure, with the sliding retraction mechanism 50 as the center of movement, the magnetic sensor 20 in this embodiment can be adjusted to meet the requirement that the measurement points are pairwise symmetric. Of course, after the magnetic sensor 20 is adjusted to a suitable position, the sliding retraction mechanism 50 needs to be fastened to the support bar 101, and the measuring arm 30 needs to be fastened to the sliding retraction mechanism 50 to keep the positions of the measurement points fixed during the measurement process and avoid affecting the magnetic field measurement accuracy.

[0040] Comparing the magnetic field measurement device of this embodiment with a conventional magnetic measurement device or method, it can be seen that the conventional measurement device or method usually assumes that the geometric center of the to-be-measured object is its magnetic core, and arranges magnetic sensors on a certain axis or a certain plane of the to-be-measured object. However, the actual position of the magnetic core usually deviates from the geometric center, resulting in the traditional measurement method being unable to provide accurate information for magnetic moment calculation or inversion. The magnetic field measurement device of this embodiment uses a measurement point symmetric structure, that is, the measurement points are in a pairwise symmetric form, which can reduce or eliminate the asymmetry of the magnetic dipole moment magnetic field and the influence of the multi-magnetic dipole moment magnetic field. The magnetic field measurement device of the embodiment not only has the comprehensive magnetic field measurement function provided by the traditional method turntable, but also has the synchronous measurement function that the traditional method does not have, fundamentally reducing the influence of device errors on the calculation results, reducing the waste of a large amount of human and time costs caused by correcting device errors, and realizing the high efficiency of magnetic field measurement.

[0041] In this embodiment, the support bar 101 can be an arc-shaped support bar or a semi-arc-shaped support bar. In this way, the magnetic sensors 20 can be evenly and equidistantly distributed around the to-be-measured object, comprehensively capturing the magnetic field distribution around the to-be-measured object and realizing the measurement of the dynamic magnetic field of the to-be-measured object.

[0042] In one example, the connection of the first ends of the support bars 101 can be achieved through the following structure. The measuring device includes a first chuck 102, on which a number of first card slots (not shown in the figure) are distributed. The first ends of the support bars 101 are respectively placed in the corresponding first card slots, thereby realizing the connection of the first ends of the support bars 101. Correspondingly, the connection of the second ends of the support bars 101 can be achieved through the following structure. The measuring device has a second chuck 103, on which a number of second card slots (not shown in the figure) are distributed. The second ends of the support bars 101 are respectively placed in the corresponding second card slots, thus realizing the connection of the second ends of the support bars 101.

[0043] In one example, a scale disk 60 is configured on the first chuck 102 and / or the second chuck 103 and / or the sample stage 40, and the support bar 101 has graduations. Through the indication of the scale disk 60 or the graduations on the support bar 101, the position of the magnetic sensor 20 can be accurately known, which is beneficial to magnetic field measurement or the position adjustment of each magnetic sensor 20 on the measuring device. For example, when calibrating the measuring arm 30, each measuring arm 30 is pointed to a specified graduation (such as +45°, 0°, -45°), and after calibration, the probe of each measuring arm 30 is slid to a unified graduation (such as 300 mm).

[0044] In one example, a lifting part 70 is connected to the bottom end of the sample stage 40. Exemplarily, the lifting part 70 can be adjusted up and down by a handwheel. For each rotation of the handwheel, the sample stage 40 can be lifted or lowered by 6 mm, and the specific lifting distance dimension refers to the scale bar. An M6 threaded hole can be provided above the sample stage 40 to facilitate sample installation design, and a positioning square hole is machined in the center, into which the probe of the magnetic sensor 20 can be placed, and the probe is fixed by a side screw.

[0045] In one example, the number of support bars 101 is at least 4, and each support bar 101 is connected to at least two measuring arms 30. Exemplarily, the magnetic field measuring device in this embodiment can be formed by splicing six sliding modules (i.e., support bars 101) at 60-degree intervals. Each sliding module includes three measuring arms 30, and the measuring arms 30 can be adjusted along the sliding module, and the adjustment range is from 0 degree to 180 degrees. The measuring arms 30 on the sliding module ensure that the stroke is adjustable within the range of 100 - 300 mm from the center of the circle, and one magnetic sensor 20 can be arranged on each measuring arm 30.

[0046] In one example, the device of this embodiment may further include a base 80 and other related accessories. For example, the base 80 includes four detachable moving wheels, and a level can be set on the base 80 to level the base. When used for magnetic field sensitive measurement, the lifting mechanism can be leveled with reference to the level on the base, and the moving wheels can be removed before magnetic field measurement. In one implementation, the external dimensions of the magnetic field measurement device are 945mm * 945mm * 1724mm in length, width, and height respectively.

[0047] In the magnetic field measurement device of this embodiment, the installation positions of the magnetic sensors 20 are evenly distributed in a symmetric (or spherically symmetric) structure. This structure does not need to consider the position of the magnetic core of the object to be measured, nor does it need to rotate the object to be measured, so as to eliminate the asymmetry of the magnetic dipole moment magnetic field and the influence of multiple magnetic dipole moments. If the magnetic sensor values around a certain part of the object to be measured are relatively large, it can be considered that there is a relatively large magnetic moment at this part of the object to be measured, which has positive significance for accurately inverting or calculating the positions of multiple magnetic dipoles of the object to be measured. In addition, the magnetic sensors 20 in this magnetic field measurement device are distributed in a "pairwise symmetric" manner, which is convenient for eliminating the influence of the induced magnetic moment in the changing geomagnetic environment.

[0048] Another embodiment of the present invention provides a magnetic field measurement method, which can be measured by using the magnetic field measurement device in the foregoing embodiment. Refer to Figure 5 As shown, it mainly includes: S510, placing the object to be measured at the central position of the magnetic field measurement device, assigning a rectangular coordinate system to the object to be measured, and the origin passes through the geometric center of the object to be measured; S520, fixing each magnetic sensor on the corresponding measurement arm respectively, and connecting all magnetic sensors to a multi-channel synchronous acquisition instrument; S530, in a zero magnetic environment, adjusting the object to be measured to a non-working state, and after the values of each magnetic sensor are stable, collecting the magnetic field intensity data sensed by each magnetic sensor; S540, adjusting the object to be measured to a working state, and after the values of each magnetic sensor are stable, collecting the magnetic field intensity data sensed by each magnetic sensor.

[0049] Exemplarily, taking the installation of 20 magnetic sensors in a magnetic field measurement device as an example, the following steps are included: First, place the object to be measured at the central position of the magnetic field measurement device, and assign a rectangular coordinate system to the object to be measured, with the origin passing through the geometric center of the object to be measured. Second, 18 magnetic sensors are evenly fixed on a non-magnetic support bar, with 3 magnetic sensors evenly placed on each support bar, and the remaining 2 magnetic sensors are respectively arranged directly above and below the object to be measured. Generally, the remaining 2 magnetic sensors do not need to be arranged, so the remaining 2 magnetic sensors are additional arrangements to measure the magnetic field in all directions of the object to be measured. Third, connect all magnetic sensors to a multi-channel synchronous acquisition instrument and perform preheating. Fourth, in a zero magnetic environment, place the object to be measured in a non-operating or shutdown state. After the values of the magnetic sensors are stable, start collecting and recording the data sensed by each magnetic sensor for a period of time. Fifth, adjust the object to be measured to the working state, and collect and record the data of each magnetic sensor. Sixth, after the data collection is completed, turn off all magnetic sensors and the object to be measured, and take out the object to be measured. Seventh, use an optimization algorithm to solve the magnetic moment of the object to be measured.

[0050] Among them, for solving the magnetic moment of the object to be measured using an optimization algorithm, optimization algorithms represented by genetic algorithms and particle swarm algorithms can both use the magnetic field measurement device to solve the multi-magnetic dipole moment of the object to be measured.

[0051] Exemplarily, taking the particle swarm algorithm as an example, it is as follows:

[0052] Before magnetic field measurement, install the magnetic sensors and record the number of magnetic sensors during the test and the coordinates of each magnetic sensor in the magnetic measurement space. Denote the number of magnetic sensors as n p , and the coordinates as r p =(r p,x , r p,y , r p,z ), p = 1, 2,..., n p , with the unit of m. After this magnetic field measurement is completed, record the measurement values of each magnetic sensor, and denote it as B m,p , with the unit of T.

[0053] For the problem of inverting multi-magnetic dipoles using the particle swarm algorithm, it is necessary to construct a suitable fitness function to calculate the fitness of each individual in the particle swarm, so as to update the position of the particles. In this example, the sum of the squares of the differences between the measurement values and the calculated values at each measurement point is used as the fitness function. Suppose there are actually n magnetic dipole moments in the object to be measured, then the magnetic field generated by each magnetic dipole moment k at the magnetic sensor p can be expressed by formula (1):

[0054]

[0055] Among them, m k =(m k,x , m k,y , mk,z )(The unit is Am 2 ) and r k =(r k,x , r k,y , r k,z )(The unit is m) respectively represent the magnitude and position parameters of a magnetic dipole moment k in the object to be measured. The unit of B p,k is T.

[0056] Thus, the magnetic field generated by all the magnetic dipole moments in the object to be measured at the magnetic sensor p can be expressed as:

[0057]

[0058] For each particle in a particle swarm, it contains the magnitudes and positions of n magnetic moments, a total of 6n parameters (both the magnitudes and positions are three-dimensional data). The parameters of each particle will be iteratively updated. Then, for each particle in each iteration process, the magnetic field generated at the magnetic sensor p can also be calculated and expressed as:

[0059]

[0060] Among them, m k' =(m k',x , m k',y , m k',z )(The unit is Am 2 ) and r k' =(r k',x , r k',y , r k',z )(The unit is m) respectively represent the magnitude and position parameters of a magnetic dipole moment k' in a particle.

[0061] Therefore, for each particle in a particle swarm, the difference between the magnetic field value generated at each measurement point and the measured value can be calculated as:

[0062] ε = B m,p - B c,p (4)

[0063] In this example, the sum of the squares of the differences between the measured values and the calculated values at each measurement point, which is a scalar, is used as the fitness function and expressed as:

[0064]

[0065] Then, the particle swarm algorithm will calculate the fitness of each particle according to the fitness function, record the global optimal value of the entire population and the individual optimal value of each particle, and update the velocity and position according to formulas (6) and (7).

[0066]

[0067] Among them, V i t and represent the velocity and position of the i-th particle at the t-th iteration respectively. P ibest and P gbest represent the individual optimal value and the global optimal value respectively. r i and r g represent two random numbers evenly distributed between 0 and 1. ω, c i and c g represent the inertia factor, the individual learning factor, and the social learning factor respectively. The inertia factor determines the degree to which an individual moves along the current direction. The individual learning factor determines the degree to which an individual moves along the direction of the individual optimal value. The social learning factor determines the degree to which an individual moves along the global optimal value.

[0068] In this example, three standard magnetic sources are tested, and inversion work is carried out according to the magnetic field test results. The magnetic moment magnitudes and position parameters of the three standard magnetic sources in the fluxgate fixture coordinate system are shown in Table 1 below:

[0069] Table 1

[0070] M1 M2 M3 <![CDATA[x / Am 2 > 0.300 0 0 <![CDATA[y / Am 2 > 0 0.300 0 <![CDATA[z / Am 2 > 0 0 0.300 R1 R2 R3 x / m 0.1250 0.0830 -0.1430 y / m 0.1690 -0.2120 0.1060 z / m -0.0970 0.1050 0.0720

[0071] Among them, M1 to M3 are the magnitudes of the corresponding three magnetic dipole moments, and R1 to R3 are the coordinates of the corresponding three magnetic dipole moments (the same hereinafter).

[0072] The coordinates of 20 three-axis magnetic sensors in the fluxgate fixture coordinate system are shown in Table 2 below:

[0073] Table 2

[0074] P1 P2 P3 P4 P5 x / m 0.2121 0.1061 -0.1061 -0.2121 -0.1061 y / m 0 0.1837 0.1837 0 -0.1837 z / m 0.2121 0.2121 0.2121 0.2121 0.2121 P6 P7 P8 P9 P10 x / m 0.1061 0.3000 0.1500 -0.1500 -0.3000 y / m -0.1837 0 0.2598 0.2598 0 z / m 0.2121 0 0 0 0 P11 P12 P13 P14 P15 x / m -0.1500 0.1500 0.2121 0.1061 -0.1061 y / m -0.2598 -0.2598 0 0.1837 0.1837 z / m 0 0 -0.2121 -0.2121 -0.2121 P16 P17 P18 P19 P20 x / m -0.2121 -0.1061 0.1061 0 0 y / m 0 -0.1837 -0.1837 0 0 z / m -0.2121 -0.2121 -0.2121 0.3000 0.3000

[0075] Among them, P1 to P20 are the coordinates of the corresponding 20 three-axis magnetic sensors.

[0076] The average value of the 10-second magnetic field data collected by 20 three-axis magnetic sensors is taken to obtain the magnetic field data corresponding to each three-axis magnetic sensor. All magnetic field data have been converted to a unified coordinate system, as shown in Table 3:

[0077] Table 3

[0078]

[0079]

[0080] Among them, B1 to B20 are the magnetic field data collected corresponding to 20 three-axis magnetic sensors.

[0081] Input the magnetic field data into the magnetic property inversion program to obtain the following inversion results, with the results rounded to four decimal places, as shown in Table 4:

[0082] Table 4

[0083] M1 M2 M3 <![CDATA[x / Am 2 > 0.3004 0.0003 -0.0001 <![CDATA[y / Am 2 > 0 0.2999 0.0003 <![CDATA[z / Am 2 > -0.0001 0 0.3002 R1 R2 R3 x / m 0.1250 0.0830 -0.1429 y / m 0.1689 -0.2120 0.1060 z / m -0.0970 0.1050 0.0720

[0084] The above inversion results are basically consistent with the magnetic moment of the actual object to be measured, indicating that the magnetic field data collected by the magnetic field measurement device and its measurement method in the present invention are more accurate, have practical engineering significance, and are conducive to the subsequent accurate solution of the multi-magnetic dipole moments of spacecraft or its single units.

[0085] The basic concepts have been described above. Obviously, for those skilled in the art, the above invention disclosure is only an example and does not constitute a limitation to this application. Although not explicitly stated here, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are proposed in this application, so such modifications, improvements, and corrections still fall within the spirit and scope of the exemplary embodiments of this application.

[0086] Meanwhile, specific terms are used in this application to describe the embodiments of this application. Such as "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application can be combined appropriately.

[0087] Although this application has been described with reference to the current specific embodiments, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate this application, and various equivalent changes or substitutions can be made without departing from the spirit of this application. Therefore, as long as the changes and variations of the above embodiments are within the scope of the spirit of this application, they will fall within the scope of the claims of this application.

Claims

1. A magnetic field measuring device, characterized in that: include: A support portion, the support portion comprising a plurality of support bars, the first ends of the support bars being connected to each other, and the second ends of the support bars being connected to each other; A plurality of magnetic sensors, each of which is arranged at one end of a corresponding measuring arm; each of the supporting bars has at least one measuring arm; A sample stage is located within a range surrounded by the plurality of magnetic sensors, and each of the magnetic sensors has another magnetic sensor symmetrically centered on the sample stage.

2. The magnetic field measuring device according to claim 1, characterized in that: The first ends of the support bars are connected, including: the device includes a first chuck, the first chuck is provided with a plurality of first slots, the first ends of the support bars are respectively placed in the corresponding slots, and / or The second ends of the support bars are connected, including: the device has a second chuck, the second chuck is distributed with a plurality of second slots, and the second ends of the support bars are respectively placed in the corresponding second slots.

3. The magnetic field measuring device according to claim 1 or 2, characterized in that: The support bar is a circular arc support bar or a semicircular arc support bar.

4. The magnetic field measuring device according to claim 1, characterized in that: The measuring arm is connected to the support bar by a sliding retracting mechanism.

5. The magnetic field measuring device according to claim 4, characterized in that: The sliding retracting mechanism has a through hole, and the measuring arm passes through the through hole.

6. The magnetic field measuring device according to claim 2, characterized in that: The first chuck and / or the second chuck and / or the sample stage are provided with a scale plate.

7. The magnetic field measuring device according to claim 1, characterized in that: The support bar is provided with scales.

8. The magnetic field measuring device according to claim 1, characterized in that: The bottom end of the sample stage is connected with a lifting part.

9. The magnetic field measuring device according to claim 1, characterized in that: The number of the support bars is at least 4, and each of the support bars is connected to at least two of the measuring arms.

10. A method for measuring a magnetic field, using the magnetic field measuring device according to any one of claims 1 to 9 for measurement, characterized in that: include: Placing the object to be measured at the center of the magnetic field measuring device, and assigning the object to be measured a rectangular coordinate system, the origin of which passes through the geometric center of the object to be measured; Fix each magnetic sensor on the corresponding measuring arm respectively, and connect all magnetic sensors to a multi-channel synchronous data acquisition instrument; In a zero-magnetic environment, the object to be measured is adjusted to a non-working state, and after the values ​​of the magnetic sensors are stabilized, the magnetic intensity data sensed by the magnetic sensors are collected; The object to be measured is adjusted to a working state, and after the values ​​of the magnetic sensors are stabilized, the magnetic intensity data sensed by the magnetic sensors are collected.

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