CN116840749A - Magnetic balance type magnetic field measuring device - Google Patents
Magnetic balance type magnetic field measuring device Download PDFInfo
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- CN116840749A CN116840749A CN202310386692.7A CN202310386692A CN116840749A CN 116840749 A CN116840749 A CN 116840749A CN 202310386692 A CN202310386692 A CN 202310386692A CN 116840749 A CN116840749 A CN 116840749A
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- 238000005070 sampling Methods 0.000 claims abstract description 13
- 230000006698 induction Effects 0.000 claims abstract description 7
- 230000009471 action Effects 0.000 claims abstract description 4
- 230000001419 dependent effect Effects 0.000 claims description 19
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000000696 magnetic material Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 13
- 230000005389 magnetism Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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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
- G01R33/0017—Means for compensating offset magnetic fields or the magnetic flux to be measured; Means for generating calibration magnetic fields
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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
- G01R33/0011—Arrangements or instruments for measuring magnetic variables comprising means, e.g. flux concentrators, flux guides, for guiding or concentrating the magnetic flux, e.g. to the magnetic sensor
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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
- G01R33/0023—Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration
- G01R33/0029—Treating the measured signals, e.g. removing offset or noise
-
- 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
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention discloses a magnetic balance type magnetic field measuring device, and relates to a magnetic field detecting device. The purpose is in order to overcome in the current weak magnetism detection that the matching of magnetosensitive sensor and magnetic balance coil axis exists the degree of difficulty to and compensation circuit is complicated problem, includes: the magnetic sensor is used for outputting a voltage signal corresponding to the magnetic induction intensity of the weak magnetic field to be detected under the action of the weak magnetic field to be detected; a current compensation circuit for generating a compensation current according to the voltage signal; the current compensation circuit enables the compensation coil to generate a secondary magnetic field with the direction opposite to the direction of the weak magnetic field to be detected; the adjusting device is used for adjusting the position of the magnetic sensor relative to the compensation coil so that the magnetic sensor is positioned at the uniform position of the secondary magnetic field and the weak magnetic field to be detected are balanced; and the sampling metering device is used for sampling the compensation current and calculating the magnetic field intensity of the weak magnetic field to be detected according to the compensation current and the number of turns of the compensation coil.
Description
Technical Field
The present invention relates to a magnetic field detection device.
Background
The weak magnetic detection technology has wide application in the fields of military application, scientific research, resource exploration and the like. The method adopts electromagnetic conversion or direct measurement of magnetic field, and obtains related information through feedback circuit design and signal processing, and is used for target magnetic anomaly detection, magnetic imaging and the like. In order to acquire more magnetic field information and a simple and effective magnetic field compensation technology, weak magnetic detection based on magnetic balance is adopted.
The requirements of aeromagnetic geomagnetic measurement, magnetic field measurement of aerospace engineering, demagnetization of military ships, guidance of torpedo, satellite ranging and the like on magnetic balance compensation are higher, and in order to obtain high-precision weak magnetic detection and avoid the defects of traditional detection, a magnetic balance type weak magnetic detection device is provided based on the zero magnetic flux principle from the relative position of a magnetic balance coil and a magnetic sensor 1.
The magnetic field detection of the magnetic balance type is widely applied to a strong magnetic field environment, and has a plurality of advantages in the field of weak magnetic detection, but has some problems:
(1) The matching of the magnetic sensor 1 and the axis of the magnetic balance coil has difficulty, and the difficulty of a subsequent compensation circuit can be increased.
(2) The current zero magnetic flux compensation method mostly adopts an electronic circuit to generate current with the magnitude and phase following for compensation. The compensation circuit is complex in design, unstable in circuit, sensitive to electromagnetic interference of environment, and once the performance drifts, the relation of dynamic following of signals can be changed, so that the weak magnetic detection device is not in a zero magnetic flux state any more.
Disclosure of Invention
The invention aims to solve the problems that the matching of a magnetic sensor and the axis of a magnetic balance coil in the existing weak magnetic detection is difficult and a compensation circuit is complex, and provides a magnetic balance type magnetic field measuring device.
The invention relates to a magnetic balance type magnetic field measuring device, which comprises a magnetic sensor, a current compensation circuit, a compensation coil, an adjusting device and a sampling metering device, wherein the current compensation circuit is connected with the magnetic sensor;
the magnetic sensor is used for outputting a voltage signal corresponding to the magnetic induction intensity of the weak magnetic field to be detected to the current compensation circuit under the action of the weak magnetic field to be detected;
the current compensation circuit is used for generating a compensation current according to the voltage signal and outputting the compensation current to the compensation coil;
the current output end of the current compensation circuit is connected with the current input end of the compensation coil, so that the compensation coil generates a secondary magnetic field with the direction opposite to that of the weak magnetic field to be detected;
the adjusting device is used for adjusting the position of the magnetic sensor relative to the compensation coil so that the magnetic sensor is positioned at the uniform position of the secondary magnetic field and the weak magnetic field to be detected are balanced; the balance indicates that the magnetic induction intensities of the secondary magnetic field and the weak magnetic field to be detected are equal in magnitude and opposite in direction;
the sampling metering device is used for sampling the compensation current and calculating the magnetic field intensity of the weak magnetic field to be detected according to the compensation current and the number of turns of the compensation coil;
the compensation current is the compensation current when the secondary magnetic field and the weak magnetic field to be detected reach balance.
The beneficial effects of the invention are as follows:
the magnetic balance type magnetic field measuring device can balance the original magnetic field through the compensation coil, reduce zero point, improve precision, and can find the position of the compensation coil at a uniform magnetic field through the position adjustment of the clamp, so that the position of the compensation coil is more matched, the structure is simple, and the adjustment is convenient.
Drawings
FIG. 1 is a schematic diagram of a magnetic balance type magnetic field measuring device according to the present invention;
FIG. 2 is a schematic diagram showing the coordination structure of the adjusting device and the magneto-sensor in the magnetic balance type magnetic field measuring device;
fig. 3 is a schematic diagram showing the transmission direction of voltage or current in a magnetic balance type magnetic field measuring device according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
Detailed description of the preferred embodiments
The magnetic balance type magnetic field measuring device of the embodiment comprises a magnetic sensor 1 and is characterized by further comprising a current compensation circuit 2, a compensation coil 3, an adjusting device 4 and a sampling metering device 7;
the magneto-dependent sensor 1 is used for outputting a voltage signal corresponding to the magnetic induction intensity of the weak magnetic field to be detected to the current compensation circuit under the action of the weak magnetic field to be detected;
a current compensation circuit 2 for generating a compensation current based on the voltage signal and outputting the compensation current to the compensation coil 3;
the current output end of the current compensation circuit 2 is connected with the current input end of the compensation coil 3, so that the compensation coil 3 generates a secondary magnetic field with the opposite direction to the weak magnetic field to be detected;
the adjusting device 4 is used for adjusting the position of the magneto-dependent sensor 1 relative to the compensation coil 3 so that the magneto-dependent sensor 1 is positioned at the uniform position of the secondary magnetic field and the weak magnetic field to be detected are balanced; the balance indicates that the magnetic induction intensities of the secondary magnetic field and the weak magnetic field to be detected are equal in magnitude and opposite in direction;
the sampling metering device 7 is used for sampling the compensation current and calculating the magnetic field intensity of the weak magnetic field to be detected according to the compensation current and the number of turns of the compensation coil 3;
the compensation current is the compensation current when the secondary magnetic field and the weak magnetic field to be detected reach balance.
Detailed description of the preferred embodiments
The present embodiment is further described with respect to the first embodiment, in which the adjusting device 4 includes a metal base 4-1, an adjusting module 4-2, and an adapter plate 4-3 that are sequentially connected;
the magneto-dependent sensor 1 is fixed on the adapter plate 4-3;
the adjusting module 4-2 can adjust the magneto-dependent sensor 1 to move along the direction perpendicular to the central axis of the compensation coil 3 or rotate around the straight line where the moving direction is located as the axis.
Other technical features of this embodiment are the same as those of the first embodiment.
Detailed description of the preferred embodiments
This embodiment is a further explanation of the first or second embodiment, and further includes a bracket 5 and a coil bobbin 6;
the coil frame 6 is cylindrical, and the coil frame 6 is erected on the bracket 5;
the compensation coil 3 is wound on the outer circumferential surface of the bobbin 6;
the surface of the coil frame 6 is provided with an inserting hole through which the magneto-sensitive sensor 1 enters the compensating coil 3.
Other technical features of the present embodiment are the same as those of the first or second embodiment.
Detailed description of the preferred embodiments
This embodiment is a further explanation of the third embodiment, in which the compensation coil 3 is wound with a copper wire having a diameter of 0.1mm; and the number of turns of the compensation coil 3 is 1000 turns.
Other technical features of the present embodiment are the same as those of the third embodiment.
Detailed description of the preferred embodiments
This embodiment is a further description of the fourth embodiment, in which the outer surface of the copper wire is coated with an insulating layer and a heat insulating layer.
Other technical features of the present embodiment are the same as those of the fourth embodiment.
Detailed description of the preferred embodiments six
In this embodiment, the material of the bobbin 6 is a nonmagnetic material, which will be described further in the third embodiment.
Other technical features of the present embodiment are the same as those of the third embodiment.
Examples
The present embodiment is described with reference to fig. 1 to 2, which are a magnetic balance type measuring apparatus for weak magnetic detection, the apparatus including: the magnetic sensor 1, the current compensation circuit 2, the compensation coil 3, the adjusting device 4, the bracket 5 and the coil frame 6.
The support 5 is made of a non-magnetic material and is used for supporting the coil former 6. The support 5 comprises a base and the adjusting means 4 are fixed to the base (which may be the central part of the base).
The coil frame 6 is made of nonmagnetic materials (nonmagnetic steel, nonmagnetic ceramics or polytetrafluoroethylene) and is a circular sleeve, the coil frame 6 provides support for the compensation coil 3, an inserting hole is formed in the lower portion of the coil frame 6, the position of the inserting hole is arranged right above the adjusting device 4, and the magneto-dependent sensor 1 can conveniently enter the coil frame 6 to form vertical combination with the axial direction of the compensation coil 3. The size of the insertion hole is related to the size of the magneto-dependent sensor 1, and is not required to be too large, and the insertion hole can just meet the requirement of entering and can rotate a certain angle.
The diameter of the wire rod of the compensation coil 3 can be 0.1mm, the wire rod is uniformly wound on the coil frame 6 in a multi-layer mode, the insertion hole is avoided, two ends of the compensation coil 3 are not excessively close to the support 5, and the two ends are led out to the current compensation circuit 2 so as to form opposite magnetic fields. The compensation coil 3 is wound on the coil frame 6 by an automatic winding machine, the number of turns is 1000, the diameter is 0.1mm, the material is copper, and polyimide is coated outside the copper wire to be used as an insulating and heat-insulating layer.
The adjusting device 4 consists of a metal seat 4-1, an adjusting module 4-2 and an adapter plate 4-3, provides support for the magneto-dependent sensor 1, and can adjust the relative position of the magneto-dependent sensor 1 and the axis of the compensation coil 3 through the adjusting device 4. The lower part of the metal seat 4-1 of the adjusting device 4 is fixed with the base. The adapter plate 4-3 is electrically connected and fixed with the magneto-dependent sensor 1 and is electrically connected with the current compensation circuit 2 for electrically connecting the magneto-dependent sensor 1 with the current compensation circuit 2.
The height and angle of the magneto-dependent sensor 1 can be adjusted by the adjusting module 4-2 to achieve the optimal position, i.e. the magnetic field uniformity. First, the magneto-dependent sensor 1 is already approximately located on the central axis of the compensation coil 3 when it enters the compensation coil 3, and the adjusting means 4 are simply trimmed to make the position of the magneto-dependent sensor 1 more appropriate.
The magneto-dependent sensor 1 is ceramic package, the pins are electrically connected and fixed with the adapter plate 4-3 of the adjusting device 4, the change of the original magnetic field is sensed, and a voltage signal (feedback signal) is output and transmitted to the current compensation circuit 2. The voltage signal is amplified and input to a power amplifier, and a secondary current is output through the power amplifier and flows through the compensation coil 3 wound around the bobbin 6. The direction of the secondary magnetic field generated by the compensation coil 3 is opposite to that of the weak magnetic field to be detected, so that the weak magnetic field to be detected is compensated, the output is gradually reduced, and when the weak magnetic field to be detected is equal to the secondary magnetic field, the compensation current is not increased any more, so that the magnetic balance state is achieved. The magnetic balance state can be detected by a sampling metering device 7 such as an external sampling resistor or an oscilloscope and the like of the current compensation circuit 2, and the magnetic balance state is achieved after the compensation current is stable. And the magnitude of the weak magnetic field to be detected can be obtained through calculation of the compensation current at the moment.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features herein may be combined in ways other than as described in the original claims. It is also to be understood that features described in connection with separate embodiments may be used in other embodiments.
Claims (6)
1. The magnetic balance type magnetic field measuring device comprises a magnetic sensor (1) and is characterized by further comprising a current compensation circuit (2), a compensation coil (3), an adjusting device (4) and a sampling metering device (7);
the magnetic sensor (1) is used for outputting a voltage signal corresponding to the magnetic induction intensity of the weak magnetic field to be detected to the current compensation circuit under the action of the weak magnetic field to be detected;
the current compensation circuit (2) is used for generating a compensation current according to the voltage signal and outputting the compensation current to the compensation coil (3);
the current output end of the current compensation circuit (2) is connected with the current input end of the compensation coil (3), so that the compensation coil (3) generates a secondary magnetic field with the direction opposite to the direction of the weak magnetic field to be detected;
the adjusting device (4) is used for adjusting the position of the magneto-dependent sensor (1) relative to the compensation coil (3) so as to ensure that the magneto-dependent sensor (1) is positioned at the uniform position of a secondary magnetic field and the weak magnetic field to be detected are balanced; the balance indicates that the magnetic induction intensities of the secondary magnetic field and the weak magnetic field to be detected are equal in magnitude and opposite in direction;
the sampling metering device (7) is used for sampling the compensation current and calculating the magnetic field strength of the weak magnetic field to be detected according to the compensation current and the number of turns of the compensation coil (3);
the compensation current is the compensation current when the secondary magnetic field and the weak magnetic field to be detected reach balance.
2. A magnetic balance type magnetic field measuring device according to claim 1, characterized in that the adjusting device (4) comprises a metal seat (4-1), an adjusting module (4-2) and an adapter plate (4-3) which are connected in sequence;
the magnetic sensor (1) is fixed on the adapter plate (4-3);
the adjusting module (4-2) can adjust the magneto-dependent sensor (1) to move along the direction perpendicular to the central axis of the compensation coil (3) or rotate by taking the straight line of the moving direction as the axis.
3. A magnetic field measuring device of the magnetic balance type according to claim 1 or 2, characterized by further comprising a bracket (5) and a coil former (6);
the coil rack (6) is cylindrical, and the coil rack (6) is erected on the bracket (5);
the compensation coil (3) is wound on the outer circumferential surface of the coil frame (6);
the surface of the coil frame (6) is provided with an inserting hole, and the magneto-sensitive sensor (1) enters the compensating coil (3) through the inserting hole.
4. A magnetic field measuring device of the magnetic balance type according to claim 3, characterized in that the compensation coil (3) is wound by copper wire with a diameter of 0.1mm; and the number of turns of the compensating coil (3) is 1000 turns.
5. The magnetic balance type magnetic field measuring device according to claim 4, wherein an outer surface of the copper wire is coated with an insulating layer and a heat insulating layer.
6. A magnetic balance type magnetic field measuring device according to claim 3, characterized in that the material of the coil former (6) is a non-magnetic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310386692.7A CN116840749A (en) | 2023-04-12 | 2023-04-12 | Magnetic balance type magnetic field measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310386692.7A CN116840749A (en) | 2023-04-12 | 2023-04-12 | Magnetic balance type magnetic field measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116840749A true CN116840749A (en) | 2023-10-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310386692.7A Pending CN116840749A (en) | 2023-04-12 | 2023-04-12 | Magnetic balance type magnetic field measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116840749A (en) |
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2023
- 2023-04-12 CN CN202310386692.7A patent/CN116840749A/en active Pending
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