CN110161287A - The high-precision magnetic field generation system of Active Compensation external world direct current and alternating current magnetic field interference - Google Patents
The high-precision magnetic field generation system of Active Compensation external world direct current and alternating current magnetic field interference Download PDFInfo
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- CN110161287A CN110161287A CN201910273788.6A CN201910273788A CN110161287A CN 110161287 A CN110161287 A CN 110161287A CN 201910273788 A CN201910273788 A CN 201910273788A CN 110161287 A CN110161287 A CN 110161287A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
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Abstract
The present invention is the high-precision magnetic field generation system of Active Compensation external world direct current and alternating current magnetic field interference, the magnetic field generation system includes three-dimensional Helmholtz coil, standard three-dimensional fluxgate sensor, three tunnel high-precision controllable output powers, high speed acquisition circuit plate, general supply and system platform, the standard three-dimensional fluxgate sensor is set to three-dimensional Helmholtz coil center, the three-dimensional Helmholtz coil includes X-axis Helmholtz coil, Y-axis Helmholtz coil and Z axis Helmholtz coil, one end of the three tunnel high-precision controllable output powers is correspondingly connected with three axis in three-dimensional Helmholtz coil respectively, the other end of three tunnel high-precision controllable output powers is connected with high speed acquisition circuit plate, the high speed acquisition circuit plate is connected with general supply and system platform respectively, belong to high-precision magnetic field technique neck Domain.Purpose be to provide a high-precision, can real-time compensation direct current and alternating current magnetic field interference, and the new system of 90% or so business capital can be saved.
Description
Technical field
The present invention relates to the height that high-precision magnetic field generation system, especially Active Compensation external world direct current and alternating current magnetic field interfere
Precision magnetic field generation system.
Background technique
The other externally-applied magnetic fields of many of life, such as automobile, subway, refrigerator, motor operation can all generate magnetic field,
This magnetic field is a kind of impact magnetic field or the quick variation magnetic field with certain frequency.By test, this quick interference magnetic
, reaching as high as this magnetic field 300nT. also can be superimposed upon on the magnetic field of helmholtz coil generation.Earth magnetic field is plus other
External interference magnetic field is superimposed upon on the magnetic field of helmholtz coil generation together, causes magnetic field accuracy error.Cause not to be able to satisfy
The requirement of scientific experiment.How a high-precision, the magnetic field of high stability are obtained whithin a period of time? if using manually
If adjustment, hence it is evident that a high-precision stable and uniform magnetic field cannot be obtained.
There are no a set of magnetic field generation systems on our times, can accomplish high-precision, real-time compensation direct current and AC magnetism
The interference of field, that is up to the present, the whole world can generate high-precision stable magnetic field generation system there are no a.
Currently in order to reaching the target for generating high-precision magnetic field, the main permalloy with high permeability is the entire large-scale last of the twelve Earthly Branches
Mu Huozi coil system wraps up, and masks external magnetic field, but this cost is very big, needs tens of to millions of money
Gold.
Although current Ba Dingdun company, Britain and MEDA company, the U.S. have used Automatic Control Theory, using the more of NI company
Performance data I/O module, acquires the output of magnet field probe, oneself establishment computer program controls the electric current of power supply, drives Hai Muhuo
Hereby coil generates a reversed magnetic field, achievees the purpose that compensate earth's magnetic field.On this basis, source current is controlled, can be produced
Uniform magnetic field required for raw.This set Control system architecture is complicated, can mask the slow D.C. magnetic field of variation.This set at present
The state-owned export control of magnetic field control system centering.
There are two very big disadvantages for this set control system simultaneously:
The multi-functional data I/O module highest analog sampling digit 18bit ADC of 1.NI company, highest simulation output are
16bit DAC causes compensation of geomagnetic field control precision to be only up to 15nT (in the case that range is 100uT).
2. extraneous alternating current magnetic field or burst magnetic field cannot be compensated.Whole system do not account for > benefit of 5Hz alternating current magnetic field
It repays, cannot achieve the purpose that high-precision control.
Summary of the invention
The purpose of the present invention is being to solve existing magnetic field generation system, it can not accomplish high-precision, real-time compensation direct current
Interference and price with alternating current magnetic field is higher, and provides the high-precision magnetic field hair of Active Compensation external world direct current and alternating current magnetic field interference
Raw system.
The high-precision magnetic field generation system of Active Compensation external world direct current and alternating current magnetic field interference, the magnetic field generation system
Including three-dimensional Helmholtz coil, standard three-dimensional fluxgate sensor, three tunnel high-precision controllable output powers, high speed acquisition circuit
Plate, general supply and system platform, the standard three-dimensional fluxgate sensor is set to three-dimensional Helmholtz coil center, described
Three-dimensional Helmholtz coil includes X-axis Helmholtz coil, Y-axis Helmholtz coil and Z axis Helmholtz coil, described
One end of three tunnel high-precision controllable output powers respectively with X-axis Helmholtz coil, the Y-axis last of the twelve Earthly Branches nurse in three-dimensional Helmholtz coil
Hereby coil and Z axis Helmholtz coil are correspondingly connected with suddenly, the other end and high speed acquisition of three tunnel high-precision controllable output powers
Circuit board is connected, and the high speed acquisition circuit plate is connected with general supply and system platform respectively.
Further, the diameter of the three-dimensional Helmholtz coil is greater than one meter, the branch of the three-dimensional Helmholtz coil
Frame is nonmetallic materials.
Further, the standard three-dimensional fluxgate sensor is the three-dimensional fluxgate sensor of high-precision low noise, institute
State noise grade < 10pT rms/ √ Hz at 1Hz, the linearity of high-precision low noise three-dimensional fluxgate sensor: <
0.005%, orthogonality: < 0.5 °, frequency response DC-3KHz, composite measurement resolution ratio < 0.1nT, the high-precision low noise three
Tie up the model F902 of fluxgate sensor.
Further, the model PA1 of the three tunnels high-precision controllable output power.
Further, the high speed acquisition circuit plate includes CPU and three road 20bit being connected respectively with CPU
DAC (digital analog converter), six road 24bit ADC (analog-digital converter) and the port USB 2.0HS/FS.
Beneficial effect by adopting the above technical scheme is: can accomplish high-precision, real-time compensation direct current and alternating current magnetic field
Interference, and business capital can be greatlyd save.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the present invention.
Specific embodiment
The contents of the present invention are further described below in conjunction with attached drawing and currently preferred specific embodiment.It is lifted
Example is served only for explaining the present invention, is not intended to limit the scope of the present invention.
As shown in fig. 1, the high-precision magnetic field of Active Compensation external world direct current and alternating current magnetic field interference is in this programme
System, the magnetic field generation system are controllable including three-dimensional Helmholtz coil, standard three-dimensional fluxgate sensor, three tunnels high-precision
Out-put supply, high speed acquisition circuit plate, general supply and system platform, the three-dimensional fluxgate sensor are set to three-dimensional Hai Muhuo
Hereby hub of a spool, the three-dimensional Helmholtz coil include X-axis Helmholtz coil, Y-axis Helmholtz coil and the Z axis last of the twelve Earthly Branches
Mu Huozi coil, one end of the three tunnel high-precision controllable output powers respectively with the X-axis last of the twelve Earthly Branches in three-dimensional Helmholtz coil
Mu Huozi coil, Y-axis Helmholtz coil and Z axis Helmholtz coil are correspondingly connected with, three tunnel high-precision controllable output powers
Other end is connected with high speed acquisition circuit plate, and the high speed acquisition circuit plate is connected with general supply and system platform respectively
It connects, in order to meet > the requirement of 3KHz frequency response, the diameter of three-dimensional Helmholtz coil described in this programme is greater than one meter,
The bracket of the three-dimensional Helmholtz coil is nonmetallic materials；In order to obtain lower noise, the standard in this programme
Three-dimensional fluxgate sensor is the three-dimensional fluxgate sensor of high-precision low noise, the noise etc. of the three-dimensional fluxgate sensor
Grade < 10pT rms/ √ Hz at 1Hz, the linearity: < 0.005%, orthogonality: < 0.5 °, frequency response DC-3KHz, composite measurement
Resolution ratio < 0.1nT, the model F902 of the three-dimensional fluxgate sensor, in the present solution, three tunnel high-precision is controllable defeated
The model PA1 of power supply out, in the present solution, the high speed acquisition circuit plate includes CPU and is connected respectively with CPU
Three road 20bit DAC (digital analog converter), six road 24bit ADC (analog-digital converter) and the port USB 2.0HS/FS,
When it is implemented, the CPU and general supply, which are connected to CPU, provides stable power supply, the CPU passes through USB 2.0HS/FS
Port connect with system platform and sends data to system platform, and the CPU passes through three road 20bit DAC (digital simulations
Converter) analog signal is sent to three tunnel high-precision controllable output powers, the six road 24bit ADC (analog-digital converter)
The analog signal sampled is converted into digital data transmission to CPU；System platform, which calculate with the time interval of 2.5us, divides
Analysis, calculated result pass through 20 high-precision DAC in real time and export corresponding voltage signals, defeated for the electric current that controls high-precision power
Out, it is able to real-time control Helmholtz coil, with the magnetic field that the compensation of the time interval of 2.5us is extraneous, is finally generated stable equal
Even magnetic field.It is 0 to ± 200uT that the magnetic field of whole system, which generates range, and control precision is < 1nT, field compensation frequency response range
DC to 3kHz.
The village China Seismology Bureau Bai Jia magnetic shield room is shielded using multilayer permalloy, is about in the shielding factor of DC-1kHz
1000 (60dB), that is under the earth's magnetic field of 40000nT, there are also the magnetic fields of 40nT inside screened room.And this set in this programme
Magnetic field generation system, input zero magnetic field order when, due to standard fluxgate sensor 0 magnetic field measurement absolute value <
5nT, therefore uniform magnetic field < 5nT ± 1nT that system generates, are better than magnetic shield room an order of magnitude, can replace cost high completely
Expensive magnetic shield room, and there is no multilayer permalloy due to touch be greater than the magnetic field 100uT after slightly magnetized, need through
The problem of normal demagnetization.
For another example in expensive electron microscope laboratory, it is desirable that there cannot be AC influence magnetic field, it can also be in this programme
This set product/system offsets stray magnetic field, comparatively cost performance is also than high.
Also for example, the test of certain large scale equipments, such as aircraft, if large scale electronic equipment etc. is using magnetic field shielding room
Mode obtain stable magnetic field, cost is up to ten million rank.And use this set high-precision magnetic field described in this money scheme
Generating system can save 90% or so fund.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (5)
1. the high-precision magnetic field generation system of Active Compensation external world direct current and alternating current magnetic field interference, it is characterised in that: the magnetic
Field generating system includes three-dimensional Helmholtz coil, standard three-dimensional fluxgate sensor, three tunnel high-precision controllable output powers, height
Fast collecting circuit board, general supply and system platform, the standard three-dimensional fluxgate sensor are set to three-dimensional Helmholtz coil
Center, the three-dimensional Helmholtz coil include X-axis Helmholtz coil, Y-axis Helmholtz coil and Z axis Helmholtz
Coil, one end of the three tunnel high-precision controllable output powers respectively with the X-axis Helmholtz in three-dimensional Helmholtz coil
Coil, Y-axis Helmholtz coil and Z axis Helmholtz coil are correspondingly connected with, and other the one of three tunnel high-precision controllable output powers
End is connected with high speed acquisition circuit plate, and the high speed acquisition circuit plate is connected with general supply and system platform respectively.
2. the high-precision magnetic field generation system of the Active Compensation external world according to claim 1 direct current and alternating current magnetic field interference,
It is characterized by: the diameter of the three-dimensional Helmholtz coil is greater than one meter, the bracket of the three-dimensional Helmholtz coil is non-
Metal material.
3. the high-precision magnetic field generation system of the Active Compensation external world according to claim 1 direct current and alternating current magnetic field interference,
It is characterized by: the three-dimensional fluxgate sensor is the three-dimensional fluxgate sensor of high-precision low noise, the high-precision is low
The noise grade of noise three-dimensional fluxgate sensor < 10pT rms/ √ Hz at 1Hz, the linearity: < 0.005%, orthogonality: <
0.5 °, frequency response DC-3KHz, composite measurement resolution ratio < 0.1nT, the high-precision low noise three-dimensional fluxgate sensor
Model F902.
4. the high-precision magnetic field generation system of the Active Compensation external world according to claim 1 direct current and alternating current magnetic field interference,
It is characterized by: the model PA1 of the three tunnels high-precision controllable output power.
5. the high-precision magnetic field generation system of the Active Compensation external world according to claim 1 direct current and alternating current magnetic field interference,
It is characterized by: the high speed acquisition circuit plate includes CPU and three road 20bit DAC being connected respectively with CPU (number
Analog converter), 2.0 port HS/FS six road 24bit ADC (analog-digital converter) and USB.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568384A (en) * | 2019-08-27 | 2019-12-13 | 中国科学院武汉物理与数学研究所 | active magnetic compensation method for ultra-sensitive atomic magnetometer |
| CN110958830A (en) * | 2019-12-27 | 2020-04-03 | 中国船舶重工集团有限公司第七一0研究所 | Combined type environmental interference magnetic field shielding system |
| CN111649893A (en) * | 2020-06-30 | 2020-09-11 | 苏州苏试试验集团股份有限公司 | Spatial three-axis magnetic field control method for electric vibration table |
| CN112450935A (en) * | 2020-10-15 | 2021-03-09 | 浙江工业大学 | Magnetocardiogram measuring method and system based on unshielded atomic magnetometer |
| CN113030812A (en) * | 2021-03-15 | 2021-06-25 | 华东师范大学 | Magnetic field locking device and method for eliminating transient environment interference |
| CN113484806A (en) * | 2021-07-14 | 2021-10-08 | 中国电子科技集团公司第九研究所 | High-precision reproduction device and reproduction method for weak magnetic field |
| CN113568053A (en) * | 2021-05-07 | 2021-10-29 | 浙江科技学院 | Magnetic field active compensation system and method controlled by mechanical arm |
| CN114601509A (en) * | 2020-12-08 | 2022-06-10 | 长春工业大学 | Design of magnetic drive micro-nano robot, preparation method and drive mode thereof |
| CN116504487A (en) * | 2023-04-26 | 2023-07-28 | 北京航空航天大学 | Magnetic field balance demagnetizing device and method and electronic equipment |
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| CN111649893A (en) * | 2020-06-30 | 2020-09-11 | 苏州苏试试验集团股份有限公司 | Spatial three-axis magnetic field control method for electric vibration table |
| CN112450935A (en) * | 2020-10-15 | 2021-03-09 | 浙江工业大学 | Magnetocardiogram measuring method and system based on unshielded atomic magnetometer |
| CN114601509A (en) * | 2020-12-08 | 2022-06-10 | 长春工业大学 | Design of magnetic drive micro-nano robot, preparation method and drive mode thereof |
| CN114601509B (en) * | 2020-12-08 | 2023-08-08 | 长春工业大学 | Design, preparation method and driving mode of magnetic driving micro-nano robot |
| CN113030812A (en) * | 2021-03-15 | 2021-06-25 | 华东师范大学 | Magnetic field locking device and method for eliminating transient environment interference |
| CN113568053A (en) * | 2021-05-07 | 2021-10-29 | 浙江科技学院 | Magnetic field active compensation system and method controlled by mechanical arm |
| CN113484806A (en) * | 2021-07-14 | 2021-10-08 | 中国电子科技集团公司第九研究所 | High-precision reproduction device and reproduction method for weak magnetic field |
| CN113484806B (en) * | 2021-07-14 | 2024-03-22 | 中国电子科技集团公司第九研究所 | High-precision reproduction device and reproduction method for weak magnetic field |
| CN116504487A (en) * | 2023-04-26 | 2023-07-28 | 北京航空航天大学 | Magnetic field balance demagnetizing device and method and electronic equipment |
| CN116504487B (en) * | 2023-04-26 | 2024-01-23 | 北京航空航天大学 | Magnetic field balance demagnetizing device and method and electronic equipment |
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