CN108401409A - A kind of magnetic field shielding device that open full frequency band is adjusted - Google Patents
A kind of magnetic field shielding device that open full frequency band is adjusted Download PDFInfo
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- CN108401409A CN108401409A CN201810059339.7A CN201810059339A CN108401409A CN 108401409 A CN108401409 A CN 108401409A CN 201810059339 A CN201810059339 A CN 201810059339A CN 108401409 A CN108401409 A CN 108401409A
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- H—ELECTRICITY
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0071—Active shielding
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Abstract
The invention discloses belong to technical field of electromagnetic compatibility to be related to a kind of magnetic field shielding device that open full frequency band is adjusted, the magnetic field shielding device is made of magnetic field detecting coil, magnetic field detection coil, driving circuit, flux control coil and corresponding mating sample stage；Magnetic field detecting coil is responsible for monitoring of environmental changes of magnetic field, driving magnetic field regulating winding external magnetic field is offset after drive circuit power is amplified, right over wherein magnetic field detecting coil is placed on, sample stage is placed in flux control hub of a spool, magnetic field detection coil and magnetic field detection probe connection, and be placed in sample table surface, driving circuit is placed on the outside of flux control coil, by armoured magnetic field above driving circuit.The magnetic field shielding device that full frequency band provided by the invention is adjusted is more advantageous to engineering practice.
Description
Technical field
The present invention relates to field of electromagnetic compatibility, more particularly to a kind of magnetic field shielding device that open full frequency band is adjusted, tool
Body is related to a kind of magnetic field shielding device that open AC and DC full frequency band is adjusted.
Background technology
With the continuous development of human civilization, electromagnetic environment is also worsening.In high-voltage line, large-scale electrical appliance, Large Steel
Around structural construction, electromagnetic noise is especially serious, and magnetic field cancellation is the general-purpose support technology of many exact sciences, in some poles
Hold measuring environment：Such as high-accuracy atomic clock electron beam imaging device, mass spectrograph is quoted extensively in neutrino detection.At certain
In a little biology magnetic measurements, measured signal many places are in 10pT (1 × 10-11) magnitude is even lower.And big 3-6 is wanted in environmental noise magnetic field
A order of magnitude.Removing noise signal becomes this kind of essential link of measurement.
There are two types of the magnetic field shielding modes generally used at present：Passive screening formula and active offset type.Wherein passive screening
Formula applicating history is the longest, and shielding harness is closed protected object in it using high-permeability material structure closed cavity,
The magnetic conductivity for building the material of shielding cavity is higher, and cavity wall is thicker, and shield effectiveness is just more notable.Common high-permeability material is for example soft
Iron, silicon steel, permalloy etc..This screening mass is big, heavy, and armoured magnetic field direction is optically opaque.Secondly, it is exactly
The shielding harness of offset type, for example, the prior art provides a kind of screening arrangement based on closure superconducting coil group structure, base
This structure is electrically connected to form than the superconducting coil group with turn ratio by certain radius.Such as patent 200910237483.6,
201310318660.X 201310318686.4,201510128739.5.But the field regulator of these Patent designs can not be right
D.C. magnetic field is adjusted；Secondly as at least needing two coils, causes volume ratio big, be unfavorable for engineering practice.
Invention content
The object of the present invention is to provide a kind of magnetic field shielding devices that open full frequency band is adjusted, which is characterized in that the magnetic
Screening arrangement is by magnetic field detecting coil, magnetic field detection coil, driving circuit, flux control coil and corresponding mating sample stage
It constitutes；Magnetic field detecting coil is responsible for monitoring of environmental changes of magnetic field, the driving magnetic field regulating winding after drive circuit power is amplified
External magnetic field is offset, and still, flux control coil must be made of superconducting coil；Wherein magnetic field detecting coil 1 is placed on magnetic
The surface of field control coil 5, sample stage 6 are placed in 5 center of flux control coil, and magnetic field detection coil 2 is placed on 6 face of sample stage
On, magnetic field detection probe 3 is located near magnetic field detection coil 2, and magnetic field detecting coil 1 receives the signal of magnetic field detection probe 3；It drives
Dynamic circuit 4 is placed on 5 outside of flux control coil, by armoured magnetic field 7 above driving circuit 4.
The driving circuit is made of direct current amplification biasing module 8, power amplifier module 9.
The flux control coil is Helmholtz (Helmholtz) coil, orthogonal using three groups of 5X, 5Y, 5Z coils
Mode constitutes flux control coil group；The flux control coil group, which forms one, can shield the open complete of three directions magnetic field
Frequency range magnetic field shielding device.
The basic principle for the magnetic field shielding device that the open full frequency band is adjusted is to utilize magnetic field detecting coil monitoring of environmental
Changes of magnetic field, according to the law of electromagnetic induction, magnetic field detection coil receives the signal of magnetic field detection probe detection, visits detection of magnetic field
Coil will produce the voltage signal of U=d Φ/dt, and wherein Φ is that magnetic field detecting coil includes the magnetic flux in area；Assuming that space magnetic
Field is sinusoidal magnetic field, the magnetic field generated by 50Hz transmission lines, then the voltage signal U of magnetic field detecting coil passes through differential and space
Magnetic field is in 90 °, the voltage signal U input driving circuits that magnetic field detecting coil generates, since driving circuit is inclined by direct current amplification
Set module, power amplifier module is constituted, and driving circuit is designed to input voltage and output voltage without phase difference；By driving
Voltage driving magnetic field regulating winding work after dynamic circuit amplification；Flux control coil is to use superconducting coil, magnetic field superconduction
Coil resistance can be considered 0, show pure inductance, then pure inductive circuit electric current meets i=-kdU/L, and wherein k is amplification coefficient,
It is adjustable parameter, finds when flux control coil current i and magnetic field detecting coil voltage U signal phase are in 90 °, with sky
Between magnetic field just be in 180 °, be equivalent to antiphase, therefore the magnetic field generated by flux control coil can mutually be supported with space magnetic field
Disappear；The amplification coefficient k of flux control coil is adjusted to realize to external magnetic field while reduce, offset or amplifying；It needs herein
Special instruction is that flux control coil needs to use superconducting coil, if built using Conventional coil, because there is resistance, and magnetic field
Regulating winding electric current centainly will produce phase shift, can not form antiphase with space magnetic field phase；Magnetic field detection coil is placed on magnetic
The surface of field control coil 5, magnetic field detection probe is located near magnetic field detection coil, by observing magnetic field detection coil voltage
Value adjusts the amplification coefficient k of flux control coil, when magnetic field detection coil no-voltage signal being made to export, that is, reaches best shielding
Effect；Thus illustrate that this open full frequency band magnetic field shielding device is especially dynamic the screening energy of humorous state external magnetic field
Power.
Secondly, the direct current biasing function of driving circuit being relied primarily on for once-through type external magnetic field regulating power is completed；First
D.C. magnetic field is detected by magnetic field detection coil, then biasing module is amplified by direct current and loads direct current biasing, through power amplification mould
Driving magnetic field regulating winding adjusts its amplification coefficient k after block amplification, and magnetic field detection coil no-voltage signal is made to export, and is formed to straight
Flow the counteracting ability in magnetic field.
The beneficial effects of the invention are as follows compared with the existing technology, magnetic field shielding device that full frequency band provided by the invention is adjusted
It is more advantageous to engineering practice.
Description of the drawings
Fig. 1 is the structural schematic diagram of magnetic field shielding device.
Fig. 2 is driving circuit structure schematic diagram.
Fig. 3 is magnetic field shielding device to noise magnetic field shielding design sketch.
Specific implementation mode
The present invention provides a kind of magnetic field shielding device that open full frequency band is adjusted, and gives with reference to the accompanying drawings and examples
Explanation.
Fig. 1 show the structural schematic diagram of magnetic field shielding device；The magnetic field shielding device is examined by magnetic field detecting coil, magnetic field
Test coil, driving circuit, flux control coil and corresponding mating sample stage are constituted；Magnetic field detecting coil is responsible for monitoring of environmental magnetic
Field variation, driving magnetic field regulating winding external magnetic field is offset after drive circuit power is amplified, still, flux control line
Circle must be made of superconducting coil, and superconducting coil is using the coiling of YBCO superconductors or uses Bi2223 high-temperature superconductor coilings.Wherein
Magnetic field detecting coil 1 is placed on the surface of flux control coil 5, and sample stage 6 is placed in 5 center of flux control coil, magnetic field detection
Coil 2 is placed on 6 face of sample stage, and magnetic field detection probe 3 is located near magnetic field detection coil 2, and driving circuit 4 is placed on flux control
5 outside of coil, by armoured magnetic field 7 above driving circuit 4.
The driving circuit is made of (as shown in Figure 2) direct current amplification biasing module 8, power amplifier module 9；The magnetic field
Regulating winding is Helmholtz (Helmholtz) coil, and flux control is constituted in such a way that three groups of 5X, 5Y, 5Z coils are orthogonal
Coil group (as shown in Figure 3)；Flux control coil group forms the open full frequency band magnetic field in maskable three directions magnetic field
Screening arrangement.
The basic principle for the magnetic field shielding device that the open full frequency band is adjusted is to utilize magnetic field detecting coil monitoring of environmental
Changes of magnetic field, according to the law of electromagnetic induction, magnetic field detection coil receives the signal of magnetic field detection probe detection, detection of magnetic field line
Circle will produce the voltage signal of U=d Φ/dt, and wherein Φ is that magnetic field detecting coil includes the magnetic flux in area；Assuming that space magnetic field
It is sinusoidal magnetic field, the magnetic field generated by 50Hz transmission lines, then the voltage signal U of magnetic field detecting coil is by differential and space magnetic
Field is in 90 °, the voltage signal U input driving circuits that magnetic field detecting coil generates, since driving circuit is to be amplified to bias by direct current
Module, power amplifier module are constituted, and driving circuit is designed to input voltage with output voltage without phase difference；Through overdriving
Voltage driving magnetic field regulating winding work after circuit amplification；Flux control coil is to use superconducting coil, magnetic field superconducting line
Circle resistance can be considered 0, show pure inductance, then pure inductive circuit electric current meets i=-kdU/L, and wherein k is amplification coefficient, is
Adjustable parameter is found when flux control coil current i and magnetic field detecting coil voltage U signal phase are in 90 °, with space
Magnetic field is in just 180 °, is equivalent to antiphase, therefore the magnetic field generated by flux control coil can cancel out each other with space magnetic field；
The amplification coefficient k of flux control coil is adjusted to realize to external magnetic field while reduce, offset or amplifying；It needs herein especially
Explanation is that flux control coil needs to use superconducting coil, if built using Conventional coil, because there is resistance, and flux control
Coil current centainly will produce phase shift, can not form antiphase with space magnetic field phase；Magnetic field detection coil is placed on magnetic field tune
The surface of nodel line circle；By observing magnetic field detection coil voltage value, the amplification coefficient k of flux control coil is adjusted, magnetic field is made
When detection coil no-voltage signal exports, that is, reach best shield effectiveness；Thus this open full frequency band magnetic field screen is illustrated
Cover the screening ability that device is especially dynamic humorous state external magnetic field.
Secondly, the direct current biasing function of driving circuit being relied primarily on for once-through type external magnetic field regulating power is completed；First
D.C. magnetic field is detected by magnetic field detection coil, then biasing module is amplified by direct current and loads direct current biasing, through power amplification mould
Driving magnetic field regulating winding adjusts its amplification coefficient k after block amplification, and magnetic field detection coil no-voltage signal is made to export, and is formed to straight
Flow the counteracting ability in magnetic field.
Embodiment 1
As shown in Figure 1, the present embodiment discloses a kind of magnetic field shielding device, including：Magnetic field detecting coil 1, magnetic field detection line
Circle 2, magnetic field detection probe 3, driving circuit 4, flux control coil 5, in addition to this also sample stage 6, by armoured magnetic field 7.
Magnetic field detecting coil 1 is responsible for monitoring of environmental changes of magnetic field, and magnetic field detecting coil 1 receives magnetic field detection probe 3 and visits
The signal of survey, magnetic field detecting coil will produce the voltage signal of U=d Φ/dt, and the voltage signal of search coil is through overdrive circuit
5 external magnetic field 7 of driving magnetic field regulating winding is offset after power amplification.In embodiment 1, as big as possible even in order to obtain
Place, the flux control coil 5 using Helmholtz (Helmholtz) structure coil are a kind of separation type coil group structures,
Center can generate relatively uniform magnetic field.Helmholtz coil uses 1 meter of structure of the length of side in embodiment 1.In Helmholtz coils
Place sample stage 6 in central area.Magnetic field detection coil 2 is placed on the 6 of sample stage in embodiment 1, and magnetic field detecting coil 1 is placed
Except Helmholtz coil 5, magnetic field detecting coil and magnetic field detection coil be all made of copper conductor of the surface with insulating layer around
System.Magnetic field detecting coil uses radius 1cm, the flat loop construction of 100 circle of the number of turns in embodiment 1.
According to the law of electromagnetic induction, magnetic field detecting coil generates the voltage signal that will produce U=d Φ/dt.Wherein Φ is to visit
Test coil includes the magnetic flux in area.Assuming that space magnetic field is sinusoidal magnetic field, for example it is the magnetic field generated by 50Hz transmission lines, that
The voltage signal of search coil is in 90 ° with space magnetic field after differential, the voltage signal input driving that search coil generates
Circuit.Driving circuit is made of direct current amplification module 8, power amplifier module 9.Wherein driving circuit basic demand input voltage
With output voltage without phase difference.
Voltage driving magnetic field regulating winding 5 after amplifying through overdrive circuit 4 works.Flux control coil is mostly important
Be to use superconducting coil, superconducting coil resistance can be considered 0, is presented as a pure inductance property.Pure inductive circuit electric current meets i
=-kdU/L, wherein k be amplification coefficient be can be coil inductance taking human as the parameter of adjusting, L.It can find regulating winding electric current i
With search coil voltage signal phase antiphase is equivalent in 180 ° just in 90 ° with space magnetic field.Therefore it is produced by regulating winding
Raw magnetic field can cancel out each other with space magnetic field.Careful adjustment factor k can realize the reduction to external magnetic field same-phase, offset or
Person amplifies.It is that regulating winding needs to use superconducting coil to need to illustrate herein, if built using Conventional coil, because
There are resistance, regulating winding electric current centainly to will produce phase shift, antiphase can not be formed with space magnetic field phase.In embodiment 1, surpass
Loop is formed using YBCO superconductor coilings.The high-temperature superconductors coilings such as Bi2223 can also be used to form, coefficient k passes through dynamic
It adjusts driving circuit power amplifier amplification coefficient and obtains optimum value.Specific regulative mode is as follows
Magnetic field detection coil 2 is placed at sample stage 6, by observe magnetic field detection coil voltage value, adjustment factor k,
Reach best shield effectiveness when magnetic field detection coil no-voltage signal.
The adjusting energy that this open full frequency band field regulator is especially dynamic humorous state external magnetic field is described above
Power.The direct current biasing function that driving circuit is relied primarily on for once-through type external magnetic field regulating power is completed.First by being placed on
3 detection D.C. magnetic field of magnetic field detection probe on sample stage 6, then by loading direct current biasing, drive and adjust by amplifying circuit
Coil generates the magnetic field that can offset environmental magnetic field, to form counteracting ability to D.C. magnetic field.Magnetic field in embodiment 1
Detection probe uses the magnet field probe based on fluxgate principle.
Embodiment 2
In embodiment 1, it provides a kind of to one direction magnetic field shielding structure, is provided in embodiment 2 a kind of maskable
The open full frequency band magnetic field shielding device in three directions magnetic field.It is the Helmholtz coil structures using three groups of orthogonal manners
At flux control coil group, as shown in Figure 3.Corresponding magnetic field detecting coil, magnetic field detection coil also need to match, no longer superfluous herein
It states.
Claims (6)
1. a kind of magnetic field shielding device that open full frequency band is adjusted, which is characterized in that the magnetic field shielding device is mainly by magnetic field
Search coil, magnetic field detection coil, driving circuit, flux control coil and corresponding mating sample stage are constituted；Detection of magnetic field line
Circle is responsible for monitoring of environmental changes of magnetic field, and driving magnetic field regulating winding external magnetic field is supported after drive circuit power is amplified
Disappear, still, flux control coil must be made of superconducting coil；Wherein magnetic field detecting coil (1) is placed on flux control coil (5)
Surface, sample stage (6) are placed in flux control coil (5) center, and magnetic field detection coil (2) is placed on sample stage (6) face, magnetic field
Detection probe (3) is located near magnetic field detection coil (2), and magnetic field detecting coil (1) receives the signal of magnetic field detection probe (3)；
Driving circuit (4) is placed on the outside of flux control coil (5), by armoured magnetic field (7) above driving circuit (4).
2. a kind of magnetic field shielding device that open full frequency band is adjusted according to claim 1, which is characterized in that the driving
Circuit is made of direct current amplification biasing module (8), power amplifier module (9).
3. a kind of magnetic field shielding device that open full frequency band is adjusted according to claim 1, which is characterized in that the magnetic field
Regulating winding is Helmholtz (Helmholtz) coil, and flux control is constituted in such a way that three groups of 5X, 5Y, 5Z coils are orthogonal
Coil group；The flux control coil group forms the open full frequency band magnetic field shielding that can shield a three directions magnetic field dress
It sets.
4. a kind of magnetic field shielding device that open full frequency band is adjusted according to claim 1, which is characterized in that superconducting coil
Using the coiling of YBCO superconductors or use Bi2223 high temperature super conductive conductor coilings.
5. a kind of magnetic field shielding method for the magnetic field shielding device that open full frequency band is adjusted described in claim 1, feature exist
In using magnetic field detecting coil monitoring of environmental changes of magnetic field, according to the law of electromagnetic induction, magnetic field detecting coil receives magnetic field inspection
The signal of probe detection is surveyed, visits the voltage signal that magnetic field detecting coil will produce U=d Φ/dt, wherein Φ is magnetic field detecting coil
Including the magnetic flux in area；Assuming that space magnetic field is sinusoidal magnetic field, the magnetic field generated by 50Hz transmission lines, then detection of magnetic field line
The voltage signal U of circle is in 90 ° by differential and space magnetic field, the voltage signal U input driving circuits that magnetic field detecting coil generates,
Since driving circuit is made of direct current amplification biasing module, power amplifier module, and driving circuit is designed to input electricity
Pressure is with output voltage without phase difference；Voltage driving magnetic field regulating winding work after amplifying through overdrive circuit；Flux control
Coil is that superconducting coil, magnetic field superconducting coil resistance is used to can be considered 0, show pure inductance, then pure inductive circuit electric current is full
Sufficient i=-kdU/L, wherein k are amplification coefficient, are adjustable parameters, find to work as flux control coil current i and detection of magnetic field
When coil voltage U signal phase is in 90 °, it is in just 180 ° with space magnetic field, is equivalent to antiphase, therefore by flux control coil
The magnetic field of generation can cancel out each other with space magnetic field；The amplification coefficient k for adjusting flux control coil is same to external magnetic field to realize
When reduce, offset or amplify；Need to illustrate to be that flux control coil needs to use superconducting coil herein, if utilized
Conventional coil is built, because there is resistance, flux control coil current centainly will produce phase shift, can not be formed with space magnetic field phase
Antiphase；Magnetic field detecting coil is placed on right over flux control coil, by observing magnetic field detection coil voltage value, adjusts magnetic field
The amplification coefficient k of regulating winding reaches best shield effectiveness when magnetic field detection coil no-voltage signal being made to export；Thus it says
The screening ability that this open full frequency band magnetic field shielding device is especially dynamic humorous state external magnetic field is illustrated.
6. the magnetic field shielding method for the magnetic field shielding device that open full frequency band is adjusted according to claim 5, feature exist
In the direct current biasing function of relying primarily on driving circuit for once-through type external magnetic field regulating power is completed；It is examined first by magnetic field
Test coil detects D.C. magnetic field, then amplifies biasing module by direct current and load direct current biasing, amplifies rear-guard through power amplifier module
Moving field regulating winding adjusts its amplification coefficient k, and magnetic field detection coil no-voltage signal is made to export, and D.C. magnetic field is supported in formation
Energy dissipating power.
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| CN201810059339.7A CN108401409B (en) | 2018-01-22 | 2018-01-22 | Open type full-band-adjusting magnetic field shielding device and magnetic field shielding method thereof |
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Cited By (5)
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| CN109765505A (en) * | 2018-12-29 | 2019-05-17 | 中国船舶重工集团公司第七一0研究所 | A kind of magnetic field compensation apparatus |
| CN109765506A (en) * | 2018-12-29 | 2019-05-17 | 中国船舶重工集团公司第七一0研究所 | A kind of screening arrangement internal magnetic field noise compensation apparatus |
| CN111465307A (en) * | 2020-04-27 | 2020-07-28 | 广东电网有限责任公司电力科学研究院 | Antenna receiver magnetic field shielding device and method |
| CN112739185A (en) * | 2020-12-17 | 2021-04-30 | 北京机电工程研究所 | Active magnetic shielding method and device based on miniature coil |
| CN115778395A (en) * | 2022-11-08 | 2023-03-14 | 成都原力辰教育科技有限公司 | Heart magnetic field measuring system, method, electronic device and storage medium |
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