CN116990731A - Fluxgate clamp and magnetic field measuring method - Google Patents
Fluxgate clamp and magnetic field measuring method Download PDFInfo
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- CN116990731A CN116990731A CN202310974087.1A CN202310974087A CN116990731A CN 116990731 A CN116990731 A CN 116990731A CN 202310974087 A CN202310974087 A CN 202310974087A CN 116990731 A CN116990731 A CN 116990731A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000000523 sample Substances 0.000 claims abstract description 202
- 238000005259 measurement Methods 0.000 claims abstract description 73
- 230000000712 assembly Effects 0.000 claims abstract description 42
- 238000000429 assembly Methods 0.000 claims abstract description 42
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims description 26
- 238000000691 measurement method Methods 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000003068 static effect Effects 0.000 abstract description 6
- 238000004364 calculation method Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 6
- 238000009434 installation Methods 0.000 description 6
- 238000013507 mapping Methods 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000005358 geomagnetic field Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/10—Plotting field distribution ; Measuring field distribution
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/0005—Geometrical arrangement of magnetic sensor elements; Apparatus combining different magnetic sensor types
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Abstract
The application provides a fluxgate clamp and a magnetic field measuring method, wherein the fluxgate clamp comprises a measuring mechanism and a sample placing frame, the measuring mechanism comprises a first mounting plate, a second mounting plate and at least two scale rings, the first mounting plate and the second mounting plate are arranged at intervals along the vertical direction, the opposite ends of the scale rings are respectively connected with the first mounting plate and the second mounting plate, the connecting ends of the scale rings and the first mounting plate and the second mounting plate are arranged at intervals along the circumferential direction and the circumference of the first mounting plate and the second mounting plate, the scale rings and the first mounting plate and the second mounting plate form a measuring space, each scale ring is provided with at least two probe assemblies, and the measuring ends of the plurality of probe assemblies face the central position of the measuring space; the sample rack is connected with the second mounting plate, and the sample rack includes the sample platform, and the sample platform is located the central point in measurement space and is used for placing the sample that awaits measuring. The fluxgate clamp can measure the moving and static magnetic fields.
Description
Technical Field
The application relates to the technical field of spacecrafts, in particular to a fluxgate clamp and a magnetic field measuring method.
Background
To meet various performance requirements, a spacecraft needs to use a certain amount of magnetic materials and have a certain magnetic moment, and a space magnetic field such as an earth or interstellar space magnetic field has a certain influence on the normal operation of the spacecraft, and particularly influences the attitude of a satellite or the precision of a satellite magnetic measurement instrument and other detection instruments, so that magnetic moment measurement and magnetic compensation of the spacecraft need to be performed in advance.
To ensure that the magnetic moment error is within a controlled range, the magnetic moment is typically calculated using an indirect method. The indirect method is to measure the magnetic field distribution around the spacecraft, and then calculate the magnetic moment through a mathematical analysis method or an optimization algorithm, such as a magnetic dipole method, a spherical surface mapping method, an equatorial mapping method, a far-field magnetic dipole method and a near-field multiple magnetic dipole method. However, when the far-field magnetic dipole method is used for measuring the magnetic field, the influence of random errors on the magnetic moment calculation result is large, and the wrong result can seriously interfere with the normal operation of the scientific satellite. While the influence of random errors on the magnetic moment calculation result is reduced when the near-field magnetic dipole method measurement is carried out, the method needs to rotate the turntable at a fixed angle until the turntable rotates for one circle, so that the requirement of comprehensively measuring the distribution of magnetic fields around a spacecraft or a single machine is met, extra errors are added in Zhejiang, for example, the angle errors of the rotating turntable, the measurement errors caused by the fluctuation of an environmental magnetic field and the like, and adverse effects are generated on the calculation result; meanwhile, because a certain time is required for rotating the turntable for one circle, the near-field measurement method is generally only suitable for measuring the static magnetic field of a sample to be measured, and cannot meet the requirement of measuring the dynamic magnetic field.
Moreover, the near-field magnetic dipole method and the equatorial mapping method generally assume that the geometric center of the sample to be measured is a magnetic core, and all the magnetic strength needles are sequentially arranged along a certain axial direction of the sample to be measured, so that even if the methods can measure the peripheral magnetic field value of the sample to be measured through a turntable, the magnetic strength information can be easily influenced by the distance between a measuring point and an actual magnetic core of an object, only partial magnetic induction intensity information around the sample to be measured can be obtained, the peripheral magnetic field distribution can not be comprehensively and finely captured, and the work of magnetic moment inversion is hindered.
In addition, only a single magnetic moment can be calculated by using a magnetic dipole method, a spherical surface mapping method and an equatorial mapping method, and a spacecraft or a single machine is regarded as one dipole, but in practice, a plurality of dipoles may exist in one spacecraft or single machine, so that the magnetic characteristics of the spacecraft or the single machine cannot be accurately reflected by the traditional method. Although the near-field multi-magnetic dipole measuring method can increase the number of magnetic moments in a calculation result and relatively accurately reflect the magnetic characteristics of an spacecraft or a single machine, the method still needs to measure for multiple times by means of a turntable, and extra errors are added, so that the synchronism cannot be met.
Based on this, the present inventors have proposed a fluxgate clamp and a magnetic field measuring method, so as to solve the above-mentioned technical problems.
Disclosure of Invention
The application aims to overcome the defects of large error and single measurement when a spacecraft performs magnetic moment measurement in the prior art, and provides a fluxgate clamp and a magnetic field measurement method.
The application solves the technical problems by the following technical proposal:
the application provides a fluxgate clamp, which is characterized by comprising:
the measuring mechanism comprises a first mounting plate, a second mounting plate and at least two scale rings, wherein the first mounting plate and the second mounting plate are arranged at intervals along the vertical direction, the opposite two ends of each scale ring are respectively connected with the first mounting plate and the second mounting plate, the connecting ends of each scale ring and the first mounting plate and the second mounting plate are arranged at intervals along the circumferential circumferences of the first mounting plate and the second mounting plate, the scale rings, the first mounting plate and the second mounting plate form a measuring space, each scale ring is provided with at least two probe assemblies, and the measuring ends of a plurality of probe assemblies face to the central position of the measuring space;
the sample rack is connected with the second mounting plate and comprises a sample table, and the sample table is positioned at the center of the measurement space and used for placing a sample to be measured.
According to one embodiment of the application, the connecting ends of at least two scale rings and the first mounting plate and the second mounting plate are uniformly arranged at intervals along the circumferential circumferences of the first mounting plate and the second mounting plate;
at least two probe assemblies arranged on each scale ring are uniformly arranged at intervals along the circumferential circumference of the scale ring.
According to one embodiment of the application, each of the scale rings comprises a first ring portion and a second ring portion, the first ring portion and the second ring portion being located on opposite sides of the first mounting plate or the second mounting plate;
the first ring part and the second ring part are respectively provided with at least one probe component, and the probe components arranged on the first ring part and the second ring part are symmetrically arranged relative to the central position of the measurement space.
According to one embodiment of the application, the scale ring is provided with a first scale mark along its circumferential circumference.
According to one embodiment of the application, the probe assembly comprises a telescopic rod and a detection head arranged on the telescopic rod, wherein the telescopic rod is arranged on the scale ring and is in sliding fit with the scale ring along the radial direction of the scale ring;
the detection head is mounted at one end part of the telescopic rod, which faces the measurement space.
According to one embodiment of the application, the first mounting plate and the second mounting plate are each provided with one of the probe assemblies on the side facing the measurement space.
According to one embodiment of the application, the probe assembly comprises a telescopic rod and a detection head, wherein the telescopic rod penetrates through the first mounting plate and extends towards the central position of the measurement space;
and a probe assembly is arranged between the sample table and the second mounting plate, and the measuring end of the probe assembly faces the measuring space.
According to one embodiment of the application, the sample placing rack comprises a bottom frame and a telescopic mechanism, one end of the bottom frame is connected with the second mounting plate, the telescopic mechanism comprises a driving piece and an adjusting rod connected with the driving piece, the driving piece is connected with the bottom frame and used for driving the adjusting rod to reciprocate along the axial direction of the adjusting rod, the adjusting rod penetrates through the second mounting plate and extends towards the central position of the measuring space, and the sample stage is mounted at one end part of the adjusting rod, which is far away from the bottom frame;
the adjusting rod is internally provided with a containing cavity, the containing cavity is internally provided with a probe assembly, and the measuring end of the probe assembly faces the measuring space.
According to one embodiment of the application, the driving piece is a hand wheel, the adjusting rod is a screw rod, and the hand wheel is in threaded rotation fit with the screw rod;
the hand wheel is used for driving the screw to rotate so as to drive the sample platform to face or be far away from the measurement space.
The application also provides a magnetic field measuring method, which is characterized in that the magnetic flux gate clamp is utilized, and the method comprises the following steps:
conveying a sample to be measured to the central position of a measurement space, and adjusting the probe assembly to a preset position;
moving the fluxgate clamp to a zero magnetic environment;
and measuring the magnetic fields of the sample to be measured in the non-working state and the working state in sequence.
The application has the positive progress effects that:
according to the fluxgate clamp provided by the application, a sample is placed in the central position of the measurement space of the measurement mechanism, at least two scale rings are arranged on the periphery of the central position, and the probe assembly arranged on the scale rings is used for collecting the intensity of the surrounding magnetic field of the sample, so that the requirement for synchronous measurement of the magnetic field is met. That is, by arranging a plurality of probe assemblies outside the measuring space, not only static magnetic field measurement can be performed, but also the change of the surrounding magnetic field of the sample to be measured in a working state can be measured, the distribution condition of the surrounding magnetic field of the sample to be measured in a certain time is collected, and the measuring requirement of the moving magnetic field around the sample to be measured is met.
Drawings
The above and other features, properties and advantages of the present application will become more apparent from the following description in conjunction with the accompanying drawings and embodiments, in which:
FIG. 1 is an isometric view of a fluxgate clamp of the present application;
FIG. 2 is a front view of the fluxgate clamp shown in FIG. 1;
FIG. 3 is a flow chart of a magnetic field measurement method of the present application.
10. A measuring mechanism; 110. a first mounting plate; 120. a second mounting plate; 130. a scale ring; 131. a first ring portion; 132. a second ring portion; 133. a first scale mark; 140. a measurement space; 150. a probe assembly; 151. a telescopic rod; 152. a detection head;
20. a sample rack; 210. a sample stage; 220. a chassis; 230. a telescoping mechanism; 231. a driving member; 232. an adjusting rod; 233. a receiving chamber; 240. a scale plate; 241. a second scale mark.
Detailed Description
In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below.
Embodiments of the present application will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Furthermore, although terms used in the present application are selected from publicly known and commonly used terms, some terms mentioned in the present specification may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Furthermore, it is required that the present application is understood, not simply by the actual terms used but by the meaning of each term lying within.
Referring to fig. 1 and 2, the present application proposes a fluxgate fixture, including a measuring mechanism 10 and a sample holder 20, where the measuring mechanism 10 includes a first mounting plate 110, a second mounting plate 120 and at least two scale rings 130, the first mounting plate 110 and the second mounting plate 120 are vertically spaced apart, opposite ends of the scale rings 130 are respectively connected with the first mounting plate 110 and the second mounting plate 120, connection ends of the scale rings 130 and the first mounting plate 110 and the second mounting plate 120 are circumferentially spaced apart along the first mounting plate 110 and the second mounting plate 120, the scale rings 130 and the first mounting plate 110 and the second mounting plate 120 form a measuring space 140, each scale ring 130 is provided with at least two probe assemblies 150, and measurement ends of the plurality of probe assemblies 150 face a central position of the measuring space 140; the sample holder 20 is connected to the second mounting plate 120, and the sample holder 20 includes a sample stage 210, and the sample stage 210 is located at a center of the measurement space 140 and is used for placing a sample to be measured.
According to the traditional magnetic field measurement method, a turntable is not required to be arranged, a measurement space 140 is formed by enclosing the first mounting plate 110, the second mounting plate 120 and the scale ring 130, the sample to be measured is placed in the measurement space 140, and the magnetic field distribution around the sample to be measured can be measured statically and dynamically by using a plurality of probe assemblies 150 arranged on the periphery of the measurement space 140, so that the influence of inconsistent magnetic field fluctuation caused by unsynchronized measurement time in the traditional measurement mode is avoided, and the requirement for synchronous measurement of the magnetic field is met. On the basis of not arranging the turntable, the application can also avoid the systematic error caused by the rotation of the turntable, avoid the waste of manpower and time caused by correcting the systematic error, and improve the measurement efficiency.
The fluxgate clamp provided by the application can realize synchronous sensing of the distribution of the magnetic field around the sample to be measured, can measure the static magnetic field, can measure the change of the magnetic field around the sample to be measured in a working state, can collect the distribution of the magnetic field around the sample to be measured in a period of time, and can meet the measurement requirement of the sample to be measured in the moving magnetic field.
In one embodiment, the connection ends of the at least two scale rings 130 and the first and second mounting plates 110 and 120 are uniformly spaced along the circumferential circumferences of the first and second mounting plates 110 and 120; at least two probe assemblies 150 disposed on each scale ring 130 are uniformly spaced along the circumferential circumference of the scale ring 130.
The scale ring 130 is uniformly spaced along the circumferential circumferences of the first mounting plate 110 and the second mounting plate 120, so that the probe assemblies 150 mounted on the scale ring 130 are uniformly distributed in the surrounding space of the sample to be measured, and thus the surrounding magnetic field distribution of the sample to be measured can be uniformly obtained.
The probe assemblies 150 on the scale ring 130 are uniformly spaced along the circumference of the scale ring 130, so that the probe assemblies 150 are uniformly arranged around the sample to be measured, and the magnetic field distribution around the sample to be measured can be accurately and comprehensively obtained.
Specifically, each scale ring 130 includes a first ring portion 131 and a second ring portion 132, the first ring portion 131 and the second ring portion 132 being located on opposite sides of the first mounting plate 110 or the second mounting plate 120; at least one probe assembly 150 is arranged on each of the first ring portion 131 and the second ring portion 132, and the probe assemblies 150 arranged on the first ring portion 131 and the second ring portion 132 are symmetrically arranged relative to the central position of the measurement space 140.
The first ring portion 131 and the second ring portion 132 may be integrally provided or may be separately provided, and are not limited thereto. The probe assemblies 150 provided on the first and second ring portions 131 and 132 are symmetrically disposed along the center position of the measurement space 140 in order to eliminate the influence of the induced magnetic moment in the geomagnetic field environment.
In one embodiment, the scale ring 130 is a circular ring, the peripheries of the plurality of scale rings 130 are spherical, the centers of the spheres correspond to the center position of the measurement space 140, and the installation positions of the probe assemblies 150 are uniformly distributed in a spherically symmetrical structure, so that the magnetic core position of the sample to be measured is not required to be considered, and the influence of the asymmetry of the magnetic dipole moment magnetic field and the multiple magnetic dipole moments can be eliminated without rotating the sample to be measured. If the number detected by the probe assembly 150 around a certain portion of the sample to be measured is larger, it can be considered that a larger magnetic moment is generated at the certain portion of the sample to be measured, and the method has positive effects on accurately inverting or calculating the multi-magnetic dipole position of the sample to be measured.
Three scale rings 130 are described below with six probe assemblies 150 disposed on each scale ring 130, but the specific number of scale rings 130 and the specific number of probe assemblies 150 disposed on each scale ring 130 are not limited.
Three scale rings 130 are disposed around the outside of the measurement space 140, and six probe assemblies 150 are disposed on each scale ring 130. Three probe assemblies 150 are disposed on the first ring portion 131, and the other three probe assemblies 150 are disposed on the second ring portion 132. The probe assemblies 150 on the first and second collar portions 131 and 132 are symmetrically disposed. At least eighteen probe assemblies 150 are uniformly arranged on the circumference side of the measurement space 140 so as to comprehensively and accurately measure the magnetic field distribution around the sample to be measured and provide more abundant reference data for magnetic moment calculation.
Specifically, the scale ring 130 is provided with a first scale mark 133 along its circumferential circumference, so that the first scale mark 133 can be used as a reference for mounting the probe assembly 150. For example, in the case that the three probe assemblies 150 disposed on the first ring portion 131 take the center position of the measurement space 140 as the origin coordinate, the probe assemblies 150 may be sequentially installed at 0 degrees, 45 degrees and-45 degrees, so that the probe assemblies 150 may be uniformly distributed around the measurement space 140.
In one embodiment, the probe assembly 150 includes a telescoping rod 151 and a detection head 152 disposed on the telescoping rod 151, the telescoping rod 151 being mounted on the scale ring 130 and slidably engaged with the scale ring 130 along a radial direction of the scale ring 130; the detection head 152 is mounted on one end of the telescopic rod 151 facing the measurement space 140.
The distance between the traditional probe and the sample is not adjustable, so that only measurement of a single distance can be realized. In the present application, the probe assembly 150 is movably disposed on the scale ring 130, so that the distance between the detection head 152 and the sample to be detected is adjustable under the control of the telescopic rod 151, so that the measurement of the magnetic field distribution at different distances relative to the sample to be detected can be realized.
Specifically, an installation block is disposed at a preset installation position of the scale ring 130, the telescopic rod 151 is disposed through the installation block and is slidably matched with the installation block, two opposite ends of the telescopic rod 151 are disposed on two opposite sides of the scale ring 130, so that one end of the telescopic rod 151 faces the measurement space 140, and the detection head 152 is mounted at one end of the telescopic rod 151 facing the measurement space 140 for magnetic field measurement.
The telescopic rod 151 may adjust the distance of the detection head 152 from the central position of the measurement space 140 by an electric or manual means. For example, the mounting block is provided with a motor and a gear to drive the telescopic rod 151 to move in the radial direction, and the driving method of the telescopic rod 151 is not limited herein.
When measuring, the distance from the detection head 152 in each probe assembly 150 to the central position of the measuring space 140 can be installed and debugged, so that the clamp is pushed into the measuring space 140 for measuring after debugging is finished, and the magnetic field measuring precision is improved.
In one embodiment, the first mounting plate 110 and the second mounting plate 120 are each provided with a probe assembly 150 on the side facing the measurement volume 140.
That is, when three scale rings 130 are provided and six probe assemblies 150 are provided on each scale ring 130, one probe assembly 150 is also provided on each of the first mounting plate 110 and the second mounting plate 120, the arrangement of the probe assemblies 150 around the sample to be measured is more uniform and comprehensive, so that the distribution of the magnetic field around the sample to be measured can be measured more accurately, and more referent data can be provided for the calculation of the magnetic moment.
Aiming at the condition that the assumption that the geometric center of the sample to be measured is taken as the magnetic core in the traditional method is not established, the application adopts the spherically symmetrical measuring point distribution to measure the magnetic field, does not need to assume that the magnetic core is positioned at the center of the sample to be measured, and is not influenced by the distance between the measuring point and the actual magnetic core. That is, the influence of the measurement point weight can be avoided, and more accurate information is provided for magnetic moment calculation or inversion.
The probe assembly 150 is arranged around the sample to be measured more comprehensively, so that not only can the magnetic field distribution situation around the sample to be measured be synchronously measured, but also the more comprehensive and fine magnetic field distribution can be provided while the system error is reduced, the real-time measurement can be carried out on the change situation of the magnetic field, the leap from the static magnetic field to the dynamic magnetic field can be realized, and the reference is provided for the calculation of DC and AC multi-magnetic dipoles, the magnetic field gradient and the magnetic field change situation.
Specifically, the probe assembly 150 includes a telescopic rod 151 and a detection head 152, and the telescopic rod 151 is disposed through the first mounting plate 110 and extends toward the center of the measurement space 140; a probe assembly 150 is disposed between the sample stage 210 and the second mounting plate 120, with the measurement end of the probe assembly 150 facing the measurement volume 140.
By adjusting the relative positions of the telescopic rod 151 and the first mounting plate 110, the distance between the detection head 152 at the top of the measurement space 140 and the sample to be measured is consistent with the distance between the detection heads 152 on the scale ring 130 and the sample to be measured.
In one embodiment, the sample holder 20 includes a bottom frame 220 and a telescopic mechanism 230, one end of the bottom frame 220 is connected to the second mounting plate 120, the telescopic mechanism 230 includes a driving member 231 and an adjusting rod 232 connected to the driving member 231, the driving member 231 is connected to the bottom frame 220 and is used for driving the adjusting rod 232 to reciprocate along the axial direction thereof, the adjusting rod 232 is arranged through the second mounting plate 120 and extends towards the central position of the measurement space 140, and the sample stage 210 is mounted at one end of the adjusting rod 232 away from the bottom frame 220; the adjusting rod 232 is provided with a containing cavity 233, a probe assembly 150 is arranged in the containing cavity 233, and the measuring end of the probe assembly 150 faces the measuring space 140.
The chassis 220 is used for supporting the measuring mechanism 10 of top, and the chassis 220 top sets up telescopic machanism 230, and telescopic machanism 230 one end is connected with second mounting panel 120 for support second mounting panel 120 and the scale ring 130 of top and first mounting panel 110, telescopic machanism 230 one end wears to locate second mounting panel 120 and extends to measuring space 140 one side, and telescopic machanism 230's setting is convenient for carry the sample that awaits measuring to measuring space 140's central point put.
Specifically, the sample stage 210 is provided with a hole, and the adjusting rod 232 is provided with a containing cavity 233 communicated with the hole, so that the requirement of arranging the probe assembly 150 below the sample stage 210 is met.
Further, a scale plate 240 is provided below the sample stage 210, and the scale plate 240 is provided with a second scale mark 241 along its circumference.
The center of the sample stage 210 is provided with a positioning hole, the probe assembly 150 is arranged in the holding cavity 233 in a penetrating way, the placed probe assembly 150 can be fixed through a screw, and the orientation direction of the probe assembly 150 can be adjusted by referring to the second scale marks 241.
In one embodiment, the driving member 231 is a hand wheel, the adjusting rod 232 is a screw, and the hand wheel is in threaded rotation with the screw; the hand wheel is used for driving the screw rod to rotate so as to drive the sample stage 210 towards or away from the measurement space 140.
The hand wheel is in threaded fit with the screw rod, so that the screw rod can be driven to move along the axial direction by manually rotating the hand wheel, and the height of the sample stage 210 is adjusted, so that the sample stage 210 finally reaches the central position of the measurement space 140. The screw is provided with a scale bar, for example, the hand wheel rotates for one circle, the sample stage 210 can be lifted by 6mm, and a specific lifting distance can refer to the scale bar.
In some other embodiments, the driving member 231 may be a cylinder, an oil cylinder, a linear motor, etc., which is not limited herein.
A removable moving wheel is also provided below the chassis 220 to facilitate pushing the clamp to a predetermined measurement position. When used for magnetic field sensitive measurements, the level on the chassis 220 can be leveled to the chassis 220 and the moving wheels removed for further measurements.
In one embodiment, the detection head 152 may be, but is not limited to, a three-axis fluxgate sensor that obtains information of an external magnetic field by generating an electromotive force proportional to the external magnetic field on a coil, and is capable of obtaining information of three components of the magnetic field induction strength of the external magnetic field at the installation position.
The manner in which the fluxgate clamp operates is described as follows:
the first step: the sample stage 210 is adjusted to the central position of the measurement space 140, and the sample to be measured is placed, so that a rectangular coordinate system of the sample to be measured is given to the sample to be measured, and the origin corresponds to the geometric center of the sample to be measured. Eighteen probe assemblies 150 are mounted on the scale rings 130, six probe assemblies 150 are mounted on each scale ring 130, and the remaining two probe assemblies 150 are respectively mounted on the first mounting plate 110 and the second mounting plate 120 to measure the omnidirectional magnetic field around the sample to be measured.
And a second step of: all probe assemblies 150 are connected with the multichannel synchronous acquisition instrument, preheated, and then the sample to be tested is in a non-working or shutdown state in a zero magnetic environment.
And a third step of: after the values of the probe assemblies 150 stabilize, data sensed by each probe assembly 150 over a period of time is initially collected and recorded.
Fourth step: and adjusting the sample to be tested into a working state, and collecting and recording the perception data of each probe assembly 150.
Fifth step: after the data acquisition is completed, the probe assembly 150 and the sample to be measured are closed, the sample to be measured is taken out, and the magnetic moment of the sample to be measured is calculated by using a multi-magnetic dipole method.
Structurally, the conventional measurement mode generally uses the geometric center of the sample to be measured as a magnetic core, and the detection head 152 is arranged on a certain axis or a certain plane of the sample to be measured, but in practice, the position of the magnetic core is usually deviated from the geometric center, so that the conventional measurement method cannot provide accurate information for magnetic moment calculation or inversion, and the measured value is easily affected by the positions of each measuring point and the magnetic core of the sample to be measured. I.e. the stealth increases the impact of the station weight. The application adopts a ball symmetrical structure, does not need to assume that the magnetic core is in the geometric center of the sample to be measured, and does not increase the influence of the measuring point weight on the measuring result and the calculating result.
Moreover, the probe assemblies 150 on the scale ring 130 are symmetrically arranged in pairs, which can reduce or eliminate the asymmetry of the magnetic dipole moment field and the influence of the multi-magnetic dipole moment field.
Compared with the traditional near field measurement method, the method has the advantages that the necessity of rotation is abandoned, the method not only has the function of comprehensively measuring the magnetic field provided by the turntable in the traditional measurement method, but also has the effect of synchronous measurement, reduces the influence of system errors on the calculation result, reduces the waste of a large amount of manpower and time cost caused by correcting the system errors, and realizes the high efficiency of magnetic field measurement.
Further, the plurality of probe assemblies 150 are uniformly distributed around the sample to be tested, so that the distribution situation of the magnetic field around the sample to be tested can be more comprehensively and accurately captured, and the fluxgate clamp provided by the application can obtain the distribution of the magnetic field around the sample to be tested in real time and synchronously due to the fact that a turntable is not needed to be designed, and the measurement of the moving magnetic field of the sample to be tested is realized.
In one embodiment, the present application can also support inversion of dynamically changing magnetic moments because multiple probe assemblies 150 can simultaneously acquire the distribution of the magnetic field around the object under test.
Specifically, the mounting position of each probe assembly 150 of the fluxgate fixture is calibrated first, and then the adjustment bar 232 of the probe assembly 150 is slid to a uniform scale. The fluxgate clamp is then pushed to the zero magnetic space. Then, the zero magnetic space is opened, the multi-channel data acquisition instrument is opened, and whether the magnetic field data detected by each detection head 152 are abnormal or not is checked. The sample to be measured is placed on the sample stage 210, and the detection head 152 has noise, so that magnetic field data of 10s or a period of time can be acquired and recorded. After the recording is finished, the zero magnetic space and the data acquisition instrument are closed, a rectangular coordinate system is given to the sample stage 210, the circle center is the origin of coordinates, the position of the sample to be measured is measured, the coordinates of the sample to be measured are recorded, finally, all the detection heads 152 are detached, the fluxgate clamp is pushed out of the zero magnetic space, and the measurement is finished.
In order to verify that the application can be used for actually measuring and subsequently inverting the magnetic moment of a sample to be measured, three standard magnetic sources are tested as follows, and inversion work is performed according to a magnetic field test result. The magnetic moment size and position parameters of the three standard magnetic sources in the fluxgate clamp coordinate system are as follows:
wherein M1 to M3 are magnitudes corresponding to five magnetic dipole moments, and R1 to R3 are coordinates corresponding to five magnetic dipole moments.
The coordinates of the twenty probe assemblies 150 in the fluxgate fixture coordinate system are as follows:
| 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 |
wherein, the coordinates of the twenty detection heads 152 correspond to P1 to P20, and the 10s magnetic field data collected by the twenty detection heads 152 are averaged to obtain the magnetic field data corresponding to each detection head 152, and all the magnetic field data are converted into the unified coordinate system:
wherein, B1 to B20 are magnetic field data correspondingly collected by 20 detection heads 152, and the magnetic field data are input into a magnetic characteristic inversion program to obtain the following inversion result (the result retains four decimal places):
| M1 | M2 | M3 | |
| x/Am 2 | 0.3004 | 0.0003 | -0.0001 |
| y/Am 2 | 0 | 0.2999 | 0.0003 |
| 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 |
according to the inversion result, the magnetic moment of the sample to be measured is basically consistent with that of the actual measured sample, so that the magnetic field data collected by the fluxgate clamp has practical engineering significance, and the function of inverting the dynamic change magnetic moment is achieved.
The application also provides a magnetic field measuring method, which comprises the steps of:
s110, conveying a sample to be measured to the central position of a measurement space, and adjusting the probe assembly to a preset position;
s120, moving the fluxgate clamp to a zero-magnetic environment;
s130, sequentially measuring magnetic fields of the sample to be measured in a non-working state and a working state.
By utilizing the method, not only can the measurement of the static magnetic field be carried out, but also the change of the surrounding magnetic field of the sample to be measured in the working state can be measured, the distribution condition of the surrounding magnetic field of the sample to be measured in a certain time is collected, and the measurement requirement of the moving magnetic field around the sample to be measured is met.
The application uses specific words to describe embodiments of the application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the application may be combined as suitable.
While the application has been described in terms of preferred embodiments, it is not intended to be limiting, but rather to the application, as will occur to those skilled in the art, without departing from the spirit and scope of the application. Therefore, any modification, equivalent variation and modification of the above embodiments according to the technical substance of the present application fall within the protection scope defined by the claims of the present application.
Claims (10)
1. A fluxgate clamp, comprising:
the measuring mechanism comprises a first mounting plate, a second mounting plate and at least two scale rings, wherein the first mounting plate and the second mounting plate are arranged at intervals along the vertical direction, the opposite two ends of each scale ring are respectively connected with the first mounting plate and the second mounting plate, the connecting ends of each scale ring and the first mounting plate and the second mounting plate are arranged at intervals along the circumferential circumferences of the first mounting plate and the second mounting plate, the scale rings, the first mounting plate and the second mounting plate form a measuring space, each scale ring is provided with at least two probe assemblies, and the measuring ends of a plurality of probe assemblies face to the central position of the measuring space;
the sample rack is connected with the second mounting plate and comprises a sample table, and the sample table is positioned at the center of the measurement space and used for placing a sample to be measured.
2. The fluxgate clamp of claim 1, wherein the connecting ends of at least two of the scale rings and the first and second mounting plates are evenly spaced circumferentially along the first and second mounting plates;
at least two probe assemblies arranged on each scale ring are uniformly arranged at intervals along the circumferential circumference of the scale ring.
3. The fluxgate clamp of claim 2, wherein each of the scale rings includes a first ring portion and a second ring portion, the first and second ring portions being located on opposite sides of the first or second mounting plate;
the first ring part and the second ring part are respectively provided with at least one probe component, and the probe components arranged on the first ring part and the second ring part are symmetrically arranged relative to the central position of the measurement space.
4. A fluxgate clamp according to any one of claims 1 to 3, wherein the scale ring is provided with a first scale mark along its circumferential circumference.
5. The fluxgate clamp of claim 1, wherein the probe assembly comprises a telescoping rod and a detection head provided on the telescoping rod, the telescoping rod being mounted on the scale ring and being in sliding engagement with the scale ring radially of the scale ring;
the detection head is mounted at one end part of the telescopic rod, which faces the measurement space.
6. The fluxgate clamp of claim 1, wherein the first and second mounting plates are each provided with one of the probe assemblies on a side facing the measurement space.
7. The fluxgate clamp of claim 6, wherein the probe assembly comprises a telescoping rod and a detection head, the telescoping rod extending through the first mounting plate and toward a central location of the measurement space;
and a probe assembly is arranged between the sample table and the second mounting plate, and the measuring end of the probe assembly faces the measuring space.
8. The fluxgate clamp of claim 7, wherein the sample holder includes a bottom frame having one end connected to the second mounting plate, and a telescopic mechanism including a driving member connected to the bottom frame and adapted to drive the adjusting rod to reciprocate along an axial direction thereof, and an adjusting rod penetrating the second mounting plate and extending toward a center position of the measurement space, the sample stage being mounted to an end of the adjusting rod facing away from the bottom frame;
the adjusting rod is internally provided with a containing cavity, the containing cavity is internally provided with a probe assembly, and the measuring end of the probe assembly faces the measuring space.
9. The fluxgate clamp of claim 8, wherein the driving member is a hand wheel, the adjustment rod is a screw, and the hand wheel is in threaded engagement with the screw;
the hand wheel is used for driving the screw to rotate so as to drive the sample platform to face or be far away from the measurement space.
10. A magnetic field measurement method using the fluxgate clamp of any one of claims 1-9, the method comprising:
conveying a sample to be measured to the central position of a measurement space, and adjusting the probe assembly to a preset position;
moving the fluxgate clamp to a zero magnetic environment;
and measuring the magnetic fields of the sample to be measured in the non-working state and the working state in sequence.
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