CN108305763A - A method of reappearing Weak magentic-field in screening arrangement - Google Patents
A method of reappearing Weak magentic-field in screening arrangement Download PDFInfo
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- CN108305763A CN108305763A CN201711448959.1A CN201711448959A CN108305763A CN 108305763 A CN108305763 A CN 108305763A CN 201711448959 A CN201711448959 A CN 201711448959A CN 108305763 A CN108305763 A CN 108305763A
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- field
- coil
- reappearing
- weak magentic
- shunt
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/20—Electromagnets; Actuators including electromagnets without armatures
- H01F7/202—Electromagnets for high magnetic field strength
- H01F7/204—Circuits for energising or de-energising
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a kind of in screening arrangement reappears the method for Weak magentic-field, by using no square coil, the Weak magentic-field that single coil can not generate can be generated, simultaneously, utilize shunt circuit, can only have small part by field coil with the electric current that stabilized current supply exports, both the above mode combines, and can reappear nanotesla grade Weak magentic-field below.Under the conditions of same current source, the lower limit that magnetic field can be reappeared with field coil extends to winged superfine (10 15T) level by conventional nanotesla grade (10 9T).
Description
Technical field
The invention belongs to magnetic field of measuring techniques, and in particular to a method of reappearing Weak magentic-field in screening arrangement.
Background technology
When reappearing micro- special magnitude (10-6T) Weak magentic-field below, in order to reduce the influence in external interference magnetic field, generally
In such a way that field coil in screening arrangement is powered.The magnetic field size of reproduction is equal to the product of field coil constant and electric current.
If reappearing small magnetic field, it is necessary to use the field coil or low current of small coil constant.The wherein coil constant of field coil
It is directly proportional to umber of turn, it is inversely proportional with coil outer diameter.Minimum coil windings the number of turns is 1 circle；Consider the factors such as actual processing,
The outer diameter of coil can not possibly be infinitely great, and common coil outer diameter is generally in decimetre or rice magnitude.With 1 circle, coil outer diameter is 1m's
For circular ring type field coil, centering coil constant is approximately equal to 1.26 μ T/A, this has been approached the line of practical common field coil
Enclose constant lower limit.For constant-current source, common constant-current source output is in mA~A magnitudes.In order to ensure the current stability of constant-current source
With current measurement accuracy, the minimum output current stablized is it is not possible that very little, and by taking 1mA as an example, then field coil reappears most
Small magnetic field is at nanotesla magnitude (10-9T).
Invention content
Reappear the method for Weak magentic-field in view of this, the object of the present invention is to provide a kind of in screening arrangement, can reappear
Most down to the Weak magentic-field of winged special magnitude (10-15T).
A method of reappearing Weak magentic-field in screening arrangement, includes the following steps：
Step 1: being formed without square coil using positive and negative two be connected in series with field coil；
Wherein：The number of turns W1 and W2 of the diameter or the length of side of two field coils and two field coils meet：The geometry central point of two field coils overlaps, and the magnetic axis parallel in the magnetic field generated；Add in machinery
Under the premise of work, assembled condition allow, the D1 and D2 of two field coils as close possible to；
Step 2: formed without one shunt circuit of increase between square field coil and stabilized current supply in two field coils,
A part for stabilized current supply output current is set to pass through no square field coil；Wherein, the resistance value of shunt resistance R1 is according to current stabilization electricity
The optimum load ability determination in source, i.e.,：When taking the resistance value under the premise of meeting reproduction magnetic field range at the stability of power supply
In optimum state；After the resistance value for determining shunt resistance R1, according to desired shunt ratio K, build-out resistor R2 is determined.
Step 3: reappearing faint magnetic without square field coil and shunt circuit using what above-mentioned steps one and step 2 determined
.
Preferably, the build-out resistor R2 selects adjustable resistance.
Preferably, described its value range of shunt ratio K is no more than 1：10000~1：10.
Preferably, the resistance value of the shunt resistance R1 is ohm level to ten ohm levels.
The present invention has the advantages that：
The present invention can generate the Weak magentic-field that single coil can not generate by no square coil, meanwhile, utilize shunting electricity
Road can only have small part by field coil with the electric current that stabilized current supply exports, and both the above mode combines, and can reappear nanotesla
Grade Weak magentic-field below.Under the conditions of same current source, the lower limit in magnetic field can be reappeared with field coil by conventional nanotesla grade
(10-9T), which is extended to, flies superfine (10-15T) level.
Description of the drawings
Fig. 1 is shunt circuit schematic diagram in the present invention.
Specific implementation mode
The present invention will now be described in detail with reference to the accompanying drawings and examples.
The present invention mainly uses two kinds of approach：First, using the positive and negative magnetic coil system being connected in series with, one group of coil
The magnetic field of winding reproduction is that just, the magnetic field of another group of coil constant coil windings reproduction proximate to it is negative, and the two is added
The remnant field smaller to one, for reappearing Weak magentic-field.Due to coil rack thickness, magnetic field homogeneity require etc. factors,
Positive and negative two groups of coil constant can not be very close, and the coil constant after positive and negative counteracting is generally than one quantity of reduction before offsetting
Grade or so.Meanwhile the magnetic coil system is formed without square structure design, can be very good to avoid mutual dry between shielded layer
Disturb influence.
Second is that increasing a shunt circuit between field coil and stabilized current supply, the electric current that stabilized current supply exports is made to only have
Small part by field coil, such as 1/10th, 1 percent, one thousandth, a ten thousandth.
1. no square coil is made of positive and negative two groups of windings series winding, diameter (or length of side), the umber of turn of two groups of windings meet
Following relationship.
In formula：
D1, D2 are respectively the diameter (or length of side) of two field coils；
W1, W2 are respectively the number of turns of two field coils.
Two windings without square coil meet the following conditions：
A) the geometry central point of two coils overlaps, and the magnetic axis parallel in the magnetic field generated；
B) under the premise of mechanical processing, assembled condition allow, diameter (or length of side) D1 and D2 of two coil windings to the greatest extent may be used
It can be close.
2. shunt resistance R1 meets claimed below.
A) its resistance value is determined according to the optimum load ability of system power supply power supply, i.e., under the premise of meeting magnetic field range
The stability of power supply is in optimum state when taking the resistance value, generally in ohm or ten ohm levels.
B) resistance that inductance value is small, temperature coefficient is low is used.
C) maximum output current that operating current is not less than system power supply power supply is appraised and decided.
D) after the resistance value for determining shunt resistance R1 according to conditions above, then build-out resistor R2 is determined as follows.3.
Meet with resistance R2 claimed below：
A) its resistance value determines as follows.
R1：R2=K
In formula：
R1, R2 --- the resistance value of shunt resistance R1 and build-out resistor R2；
K --- desired shunt ratio.
B) resistance that inductance value is small, temperature coefficient is low is used.
C) when shunt ratio needs to adjust in a certain range, R2 selects adjustable resistance, and adjustable extent is according to shunting
Resistance R1 and shunt ratio range determine.
3. according to the demand of different current sources and magnetic field range, its value range of shunt ratio is usually no more than 1：10000
~1：10.
Embodiment：
The free space of magnetic shielding device is Φ 300mm, and existing current range is the current source of 1mA~100mA, is needed
Reappear the Weak magentic-field of 10fT~1pT in the space of Φ 200mm.
In the usual way, it is assumed that it is W=10 circles to select the coil of helmholtz arrangement, coil turn.The then line of the coil
It is about 60.0 μ T/A to enclose constant, and the range μ T of about 60pT~6 in magnetic field are reappeared using the current source that current range is 1mA~100mA,
It is it is expected to reappear magnetic field 6000 times, much cannot be satisfied the requirement of reproduction 10fT~1pT Weak magentic-fields.
The method for using the present invention, it is assumed that the wall thickness of coil is 7.5mm, then the parameter of the two coil is diameter D1=
300mm, D2=285mm, the number of turns W1=9 circles, W2=10 circles.Then the coil constant of two groups of coils respectively may be about 54.0 μ T/A and
63.2μT/A.For composition without square coil, coil constant is 9.2 μ T/A after two groups of positive anti-series of coil.Using current range be 1mA~
The range about 9.2pT~920pT in the current source reproduction magnetic field of 100mA, the magnetic field are it is expected to reappear magnetic field 920 times.
In shunt circuit, it is assumed that R1 values are 10 Ω, split ratio 1：920, then R2 values are 9.2k Ω.At this point, working as
When current source output current is 1mA~100mA, the electric current of no square coil is flowed through for 1/920mA~1/9.2mA, in no square coil
The magnetic field of reproduction is desired 10fT~1pT Weak magentic-fields, it can be seen that, method of the invention can reappear most down to winged special amount
The Weak magentic-field of grade (10-15T).
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in the present invention's
Within protection domain.
Claims (4)
1. a kind of method reappearing Weak magentic-field in screening arrangement, which is characterized in that include the following steps：
Step 1: being formed without square coil using positive and negative two be connected in series with field coil；
Wherein：The number of turns W1 and W2 of the diameter or the length of side of two field coils and two field coils meet：The geometry central point of two field coils overlaps, and the magnetic axis parallel in the magnetic field generated；Add in machinery
Under the premise of work, assembled condition allow, the D1 and D2 of two field coils as close possible to；
Step 2: making steady without a shunt circuit is increased between square field coil and stabilized current supply in two field coil compositions
A part for stream electric power outputting current passes through no square field coil；Wherein, the resistance value of shunt resistance R1 is according to stabilized current supply
The determination of optimum load ability, i.e.,：The stability of power supply is in most when taking the resistance value under the premise of meeting reproduction magnetic field range
Good state；After the resistance value for determining shunt resistance R1, according to desired shunt ratio K, build-out resistor R2 is determined.
Step 3: reappearing Weak magentic-field without square field coil and shunt circuit using what above-mentioned steps one and step 2 determined.
2. reappearing the method for Weak magentic-field in screening arrangement as described in claim 1, which is characterized in that the build-out resistor
R2 selects adjustable resistance.
3. reappearing the method for Weak magentic-field in screening arrangement as described in claim 1, which is characterized in that the shunt ratio
Its value range of K is no more than 1：10000~1：10.
4. reappearing the method for Weak magentic-field in screening arrangement as described in claim 1, which is characterized in that the shunt resistance
The resistance value of R1 is ohm level to ten ohm levels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711448959.1A CN108305763A (en) | 2017-12-27 | 2017-12-27 | A method of reappearing Weak magentic-field in screening arrangement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711448959.1A CN108305763A (en) | 2017-12-27 | 2017-12-27 | A method of reappearing Weak magentic-field in screening arrangement |
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| CN108305763A true CN108305763A (en) | 2018-07-20 |
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| CN201711448959.1A Pending CN108305763A (en) | 2017-12-27 | 2017-12-27 | A method of reappearing Weak magentic-field in screening arrangement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109782196A (en) * | 2018-12-25 | 2019-05-21 | 中国船舶重工集团公司第七一0研究所 | A kind of interference field compensation method |
| 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 |
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| DE1157699B (en) * | 1961-06-30 | 1963-11-21 | Philips Patentverwaltung | Wattmeter circuit with Hall probe |
| GB996583A (en) * | 1961-11-09 | 1965-06-30 | Philips Electronic Associated | Circuit arrangement with a magnetron |
| CN102136336A (en) * | 2010-12-29 | 2011-07-27 | 中国船舶重工集团公司第七一○研究所 | Method for compensating heterogeneity of magnetic field coil by shunting |
| CN202204860U (en) * | 2011-08-17 | 2012-04-25 | 中国船舶重工集团公司第七一○研究所 | Series-parallel combined magnetic field coil shunt circuit |
| CN103454461A (en) * | 2013-09-05 | 2013-12-18 | 中国船舶重工集团公司第七一〇研究所 | Method for compensating heterogeneity of shield magnetic field coil through winding |
| CN103858299A (en) * | 2011-04-15 | 2014-06-11 | 瓦里安半导体设备公司 | Fault current limiter system with current splitting device |
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2017
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1157699B (en) * | 1961-06-30 | 1963-11-21 | Philips Patentverwaltung | Wattmeter circuit with Hall probe |
| GB996583A (en) * | 1961-11-09 | 1965-06-30 | Philips Electronic Associated | Circuit arrangement with a magnetron |
| CN102136336A (en) * | 2010-12-29 | 2011-07-27 | 中国船舶重工集团公司第七一○研究所 | Method for compensating heterogeneity of magnetic field coil by shunting |
| CN103858299A (en) * | 2011-04-15 | 2014-06-11 | 瓦里安半导体设备公司 | Fault current limiter system with current splitting device |
| CN202204860U (en) * | 2011-08-17 | 2012-04-25 | 中国船舶重工集团公司第七一○研究所 | Series-parallel combined magnetic field coil shunt circuit |
| CN103454461A (en) * | 2013-09-05 | 2013-12-18 | 中国船舶重工集团公司第七一〇研究所 | Method for compensating heterogeneity of shield magnetic field coil through winding |
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| 翟晶晶: "交变微弱磁场复现研究", 《电子世界》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109782196A (en) * | 2018-12-25 | 2019-05-21 | 中国船舶重工集团公司第七一0研究所 | A kind of interference field compensation method |
| CN109782196B (en) * | 2018-12-25 | 2021-06-22 | 中国船舶重工集团公司第七一0研究所 | Interference magnetic field compensation method |
| 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 |
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Application publication date: 20180720 |