CN108732517B - Flux gate gradient measuring probe - Google Patents
Flux gate gradient measuring probe Download PDFInfo
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- CN108732517B CN108732517B CN201810363930.1A CN201810363930A CN108732517B CN 108732517 B CN108732517 B CN 108732517B CN 201810363930 A CN201810363930 A CN 201810363930A CN 108732517 B CN108732517 B CN 108732517B
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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
- G01R33/022—Measuring gradient
Abstract
The invention discloses a flux gate gradient measuring probe, which comprises a non-magnetic framework, a magnetic core, a measuring coil and an exciting coil, wherein the non-magnetic framework is arranged on the magnetic core; the non-magnetic framework comprises two straight frameworks which are parallel to each other; the non-magnetic framework is axially provided with a cavity, and the magnetic core is arranged in the cavity of the non-magnetic framework in a penetrating manner and is connected end to form an annular structure with two parallel sides; meanwhile, two sections of measuring coils which are spaced from each other are wound on the outer walls of the two straight frameworks; the excitation coils are respectively wound on the two sides of each section of measuring coil and the outer wall of each straight body framework. The invention can avoid the error of gradient measurement by adopting a plurality of probes, has high measurement sensitivity and good precision, and can finish the magnetic field gradient measurement along a single direction.
Description
Technical Field
The invention relates to a fluxgate probe, in particular to a fluxgate gradient measurement probe.
Background
The existing fluxgate probe is mainly used for measuring magnetic field components and generally comprises a non-magnetic framework, a magnetic core, an exciting coil and a measuring coil, wherein the magnetic core generally adopts a cylindrical structure, and the single exciting coil and the single measuring coil are wound on the outer side of the cylindrical framework to form the fluxgate sensor probe. The gradient measurement adopts two fluxgate probes which are arranged at a certain interval distance, and simultaneously, the readings are carried out, and the difference of the readings is taken as the result of the gradient measurement. However, the multi-probe has poor measurement accuracy and is easy to form measurement errors.
Disclosure of Invention
The invention aims to solve the technical problem of providing a fluxgate gradient measurement probe which avoids the error of gradient measurement by adopting a plurality of probes, has high measurement sensitivity and good precision and can complete magnetic field gradient measurement along a single direction aiming at the defects of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a flux gate gradient measuring probe comprises a non-magnetic framework, a magnetic core, a measuring coil and an exciting coil;
the non-magnetic framework comprises two straight frameworks which are parallel to each other;
the non-magnetic framework is axially provided with a cavity, and the magnetic core is arranged in the cavity of the non-magnetic framework in a penetrating manner and is connected end to form an annular structure with two parallel sides;
meanwhile, two sections of measuring coils which are spaced from each other are wound on the outer walls of the two straight frameworks;
the excitation coils are respectively wound on the two sides of each section of measuring coil and the outer wall of each straight body framework.
Furthermore, in the flux gate gradient measurement probe, preferably, two straight bodies of the two nonmagnetic frameworks are connected through a connecting piece, so that the nonmagnetic frameworks are connected into a whole.
Furthermore, in the fluxgate gradient measurement probe, preferably, the annular magnetic core includes an exposed portion and a shielded portion, two ends of the cavity of the straight body skeleton are through, the shielded portion of the magnetic core is inserted into the cavities of the two straight body skeletons, and the exposed portion of the magnetic core is located outside the two ends of the straight body skeleton.
Furthermore, in the fluxgate gradient measurement probe, preferably, the nonmagnetic skeleton is an annular structure, and two parallel sides of the nonmagnetic skeleton are straight skeletons.
Furthermore, in the fluxgate gradient measurement probe, preferably, the annular magnetic core is inserted into the cavity without the magnetic frame.
Further, in the fluxgate gradient measurement probe, it is preferable that excitation coils on both sides of the measurement coil adopt a symmetric differential structure.
Further, in the fluxgate gradient measurement probe, it is preferable that, of the four excitation coils on both sides of one measurement coil, any two adjacent excitation coils have opposite winding directions.
Furthermore, in the fluxgate gradient measurement probe, preferably, distances between the excitation coils and the measurement coils on different straight body frameworks on the same side of the measurement coil are the same, and the wire diameter and the number of winding turns of the coil are the same; the wire diameter and the number of winding turns of the two measuring coils are the same.
Furthermore, in the flux gate gradient measurement probe, a distance is preferably reserved between the excitation coil arranged close to two ends of the nonmagnetic framework and the end face of the nonmagnetic framework.
Further, in the fluxgate gradient measurement probe, preferably, the nonmagnetic skeleton is made of a nonmagnetic polymer material by a 3D printing method.
In the fluxgate gradient measurement probe, the magnetic permeability of the magnetic core can be changed between a high magnetic permeability state and a saturation state by the exciting coil under the action of the exciting voltage, the magnetic permeability of the magnetic core in the high magnetic permeability state is improved by thousands of times, and the magnetic flux density in the measuring coil is increased; the magnetic permeability of the magnetic core in a saturation state is close to the air permeability, and the magnetic flux density in the measuring coil is the same as the external magnetic field density. Due to the change of the magnetic permeability of the magnetic core, the external magnetic field intensity is modulated on the change of the magnetic flux density, voltage is induced by measuring the change of the magnetic flux density in the coil, and the induced voltage contains the intensity information of the external magnetic field. Each measuring coil and the multi-segment exciting coil around the measuring coil adopt a symmetrical differential structure so as to enhance the effective signal of an external magnetic field and cancel the ineffective signal. In order to obtain gradient information of an external magnetic field, the same structure is used on the same magnetic core, two sections of measuring coils are respectively wound on a non-magnetic framework of a runway structure at certain intervals, the two sections of measuring coils respectively sense the external magnetic field information of corresponding point positions and output the external magnetic field information in a voltage mode, and voltage signals obtained by the two sections of measuring coils are subjected to differential amplification through a differential operational amplifier circuit, so that the gradient information of the external magnetic field along the axial direction of the structure can be obtained.
The fluxgate gradient measurement probe adopts the same magnetic core to measure the magnetic field gradient, and external magnetic field information is directly acquired by the same magnetic core in the completely same state, so that the error of gradient measurement by adopting a plurality of probes is avoided, the measurement sensitivity is high, the precision is good, and the magnetic field gradient measurement along a single direction can be completed.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a top view of FIG. 1 of an embodiment of the present invention;
fig. 3 is a left side view of fig. 1 of an embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1 to 3, a flux gate gradient measurement probe includes a nonmagnetic skeleton 100, a magnetic core 300, a measurement coil 400, and an excitation coil 200; the non-magnetic framework 100 comprises two straight frameworks 101 which are parallel to each other; the non-magnetic framework 100 is axially provided with a cavity, and the magnetic core 300 is arranged in the cavity of the non-magnetic framework 100 in a penetrating manner and connected end to form an annular structure with two parallel sides; meanwhile, two sections of measuring coils 400 which are spaced from each other are wound on the outer walls of the two straight frameworks 101; the excitation coil 200 is respectively wound on the outer wall of each straight body framework at two sides of each section of measuring coil 400.
The non-magnetic skeleton 100 is a supporting main body of the fluxgate gradient measurement probe, the non-magnetic skeleton 100 is made of a non-magnetic high polymer material into a hollow cylindrical structure with a cavity, and the cross section of the non-magnetic skeleton 100 can be a symmetrical structure such as a square ring, a circular ring or an elliptic ring, preferably the circular ring or the square ring. The size of the cavity is determined by the magnetic core 300, and a gap or no gap may be left between the magnetic core 300 and the inner wall of the cavity. The length of the nonmagnetic framework 100 is designed according to actual needs, and is not limited herein.
The non-magnetic framework 100 is made of a non-magnetic high polymer material, and the material characteristics require that the non-magnetic framework 100 is non-magnetic, the non-magnetic framework 100 has certain hardness, a coil can be wound on the outer wall of the non-magnetic framework and can support the coil, the non-magnetic framework can be made by injection molding, the non-magnetic framework is preferably made by a 3D printing mode, a corresponding model can be designed on printer modeling software according to different requirements for 3D printing, a structural model meeting the parameters is designed according to the size of different magnetic core 300 materials in advance, an optimal model scheme is found, and the manufacturing precision is improved.
There are two embodiments of the structure of the non-magnetic skeleton 100:
the shape, the number and the position of the connecting piece 110 are not limited, and the connecting piece 110 can be arranged on the straight body frameworks 101 which are not provided with the exciting coil 200 and the measuring coil 400, preferably, the connecting piece 110 and the straight body frameworks 101 are of an integrally formed structure, particularly, the connecting piece 110 and the lower half part of the nonmagnetic framework 100 are directly manufactured into an integral structure through injection molding or 3D printing, and in the embodiment, the size of the nonmagnetic framework 100 is 2 × 2 × 200 mm.
In the present invention, the magnetic core 300 has a ring-shaped structure, and the cross-sectional shape thereof may be circular, square, or other suitable shapes. In this embodiment, an elongated strip-shaped (rectangular cross-sectional shape) magnetic core 300 is selected, and based on this embodiment, the annular magnetic core 300 includes an exposed portion and a shielding portion at the installation position of the non-magnetic frame 100, the two ends of the cavity of the straight frame 101 are through, the shielding portion of the magnetic core 300 is inserted into the cavities of the two straight frames 101, and the exposed portion of the magnetic core 300 is located outside the two ends of the straight frame 101.
The measuring coil 400 is wound on the outer wall of two parallel combined straight skeletons 101, and the measuring coil 400 is wound into two sections at a certain distance. The distance between the two measuring coils 400 is determined according to the measuring requirements and the measuring environment, and in the embodiment, the distance between the two measuring coils 400 is 60mm-80 mm. In order to obtain gradient information of the external magnetic field, the measuring coils 400 with the same structure are used on the same magnetic core 300, the external magnetic field information of corresponding points is respectively induced by the two measuring coils 400 and is output in a voltage form, and the voltage signals obtained by the two measuring coils 400 are differentially amplified through a differential operational amplifier circuit, so that the gradient information of the external magnetic field along the axial direction of the structure can be obtained.
In order to enhance the effective signal of the external magnetic field and cancel the ineffective signal, it is preferable that the excitation coils 200 on both sides of the measurement coil 400 have a symmetrical differential structure. The differential structure is that winding directions are opposite, one clockwise and one anticlockwise, and each 2 sections form a group of differential windings, so that 2 groups of differential windings are formed. In this embodiment, in the four excitation coils 200 on both sides of one measurement coil 400, the winding directions of any two adjacent excitation coils 200 are opposite, that is, the winding directions of the enameled wires of two excitation coils 200 on the same straight body frame 101 and two excitation coils 200 corresponding to different straight body frames 101 are opposite. The structure can enhance the effective signal of the external magnetic field and cancel the ineffective signal.
The distance between the exciting coil 200 and the measuring coil 400 on different straight body frameworks 101 on the same side of the measuring coil 400 is the same, the wire diameter and the number of winding turns of the coil are the same, and the distance between the exciting coil 200 and the measuring coil 400 on the same straight body framework 101 is the same. The wire diameter and the number of winding turns of the two measuring coils 400 are the same.
And a distance is reserved between the excitation coil 200 and the end face of the straight body framework 101, which are close to the two ends of the straight body framework 101, and the length of the distance is 10-20 mm. The length of the magnetic core 300 exposed at both ends of the nonmagnetic skeleton 100 is 10-20 mm.
Another embodiment of the nonmagnetic skeleton is: the non-magnetic framework is of an annular structure, and two parallel sides of the non-magnetic framework are straight frameworks. The non-magnetic skeleton and the magnetic core are matched in shape, and the annular magnetic core is arranged in the cavity of the non-magnetic skeleton in a penetrating mode. The non-magnetic framework can be divided into an upper part and a lower part when being manufactured, wherein the upper part is an annular sheet, the lower part is provided with an annular groove, the magnetic core is bonded and fixed in the groove, and then the sheet is bonded in the lower part to close the groove, thus completing the assembly.
Claims (10)
1. A flux gate gradient measuring probe comprises a non-magnetic framework, a magnetic core, a measuring coil and an exciting coil; the method is characterized in that:
the non-magnetic framework comprises two straight frameworks which are parallel to each other;
the non-magnetic framework is axially provided with a cavity, and the magnetic core is arranged in the cavity of the non-magnetic framework in a penetrating manner and is connected end to form an annular structure with two parallel sides;
meanwhile, two sections of measuring coils which are spaced from each other are wound on the outer walls of the two straight frameworks;
the excitation coils are respectively wound on the two sides of each section of measuring coil and the outer wall of each straight body framework.
2. The flux gate gradient measurement probe of claim 1, wherein the two straight bodies of the nonmagnetic framework are connected by a connecting piece to connect the nonmagnetic frameworks into a whole.
3. The fluxgate gradient measurement probe according to claim 2 wherein the annular magnetic core comprises an exposed portion and a shielded portion, two ends of the cavity of the straight body frame are through, the shielded portion of the magnetic core is inserted into the cavity of the two straight body frames, and the exposed portion of the magnetic core is located outside the two ends of the straight body frame.
4. The fluxgate gradient measurement probe according to claim 1, wherein the nonmagnetic skeleton has a ring-shaped structure, and two parallel sides of the nonmagnetic skeleton are straight skeletons.
5. The fluxgate gradient measurement probe of claim 4 wherein the ring-shaped magnetic core is inserted in the cavity of the nonmagnetic skeleton.
6. The fluxgate gradient measurement probe of claim 1 wherein the excitation coils on both sides of the measurement coil are of a symmetrical differential structure.
7. The fluxgate gradient measurement probe according to claim 6, wherein four excitation coils on both sides of one measurement coil are wound in opposite directions on any two adjacent excitation coils.
8. The fluxgate gradient measurement probe according to claim 1, wherein distances between the excitation coils and the measurement coils on different straight body frames on the same side of the measurement coil are the same, and coil diameters and winding numbers of the excitation coils on different straight body frames on the same side of the measurement coil are the same; the wire diameter and the number of winding turns of the two measuring coils are the same.
9. The flux gate gradient measurement probe of claim 1, wherein the excitation coil is disposed proximate to the ends of the nonmagnetic frame and spaced from the end faces of the nonmagnetic frame.
10. The fluxgate gradient measurement probe according to claim 1, wherein the nonmagnetic skeleton is made of a nonmagnetic polymer material by a 3D printing method.
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| CN201810363930.1A CN108732517B (en) | 2018-04-22 | 2018-04-22 | Flux gate gradient measuring probe |
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| CN201810363930.1A CN108732517B (en) | 2018-04-22 | 2018-04-22 | Flux gate gradient measuring probe |
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| CN108732517A CN108732517A (en) | 2018-11-02 |
| CN108732517B true CN108732517B (en) | 2020-07-14 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2337128B (en) * | 1997-03-10 | 2001-12-05 | Secr Defence | Magnetic gradiometer |
| CN101995559A (en) * | 2009-08-24 | 2011-03-30 | 北京纳特斯拉科技有限公司 | Triaxial fluxgate probe |
| EP2388608A1 (en) * | 2010-05-18 | 2011-11-23 | Ceské Vysoké Ucení Technické V Praze | Fluxgate sensor circuit for measuring the gradient of a magnetic field |
| CN102346200A (en) * | 2011-09-29 | 2012-02-08 | 广东工业大学 | Magnetic core shell of fluxgate sensor probe and manufacturing method thereof |
| CN106772137A (en) * | 2017-03-15 | 2017-05-31 | 北京航空航天大学 | A kind of full tensor Magnetic Gradient Measurement device based on copper coil |
| CN107450036A (en) * | 2017-07-19 | 2017-12-08 | 吉林大学 | Self-injection locking formula concatenated flux door sensor and implementation |
| CN104849681B (en) * | 2015-06-10 | 2018-04-03 | 武汉中科波谱技术有限公司 | A kind of nuclear magnetic resonance chemical analyser gradient coil |
-
2018
- 2018-04-22 CN CN201810363930.1A patent/CN108732517B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2337128B (en) * | 1997-03-10 | 2001-12-05 | Secr Defence | Magnetic gradiometer |
| CN101995559A (en) * | 2009-08-24 | 2011-03-30 | 北京纳特斯拉科技有限公司 | Triaxial fluxgate probe |
| EP2388608A1 (en) * | 2010-05-18 | 2011-11-23 | Ceské Vysoké Ucení Technické V Praze | Fluxgate sensor circuit for measuring the gradient of a magnetic field |
| CN102346200A (en) * | 2011-09-29 | 2012-02-08 | 广东工业大学 | Magnetic core shell of fluxgate sensor probe and manufacturing method thereof |
| CN104849681B (en) * | 2015-06-10 | 2018-04-03 | 武汉中科波谱技术有限公司 | A kind of nuclear magnetic resonance chemical analyser gradient coil |
| CN106772137A (en) * | 2017-03-15 | 2017-05-31 | 北京航空航天大学 | A kind of full tensor Magnetic Gradient Measurement device based on copper coil |
| CN107450036A (en) * | 2017-07-19 | 2017-12-08 | 吉林大学 | Self-injection locking formula concatenated flux door sensor and implementation |
Non-Patent Citations (2)
| Title |
|---|
| Michal Janosek et al.."Dual-core fluxgate gradiometer with gradient feedback".《SENSORS, 2013 IEEE》.2013, * |
| 章志涛 等."基于三端式磁通门技术的磁力梯度仪".《上 海 海 事 大 学 学 报》.2008,第29卷(第2期), * |
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