CN105957687A - Apparatus and method for generating uniform magnetic field - Google Patents
Apparatus and method for generating uniform magnetic field Download PDFInfo
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- CN105957687A CN105957687A CN201610537023.5A CN201610537023A CN105957687A CN 105957687 A CN105957687 A CN 105957687A CN 201610537023 A CN201610537023 A CN 201610537023A CN 105957687 A CN105957687 A CN 105957687A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000035699 permeability Effects 0.000 claims description 6
- 238000005259 measurement Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000001069 Raman spectroscopy Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
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- 238000004364 calculation method Methods 0.000 description 1
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- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005305 interferometry Methods 0.000 description 1
- 238000000960 laser cooling Methods 0.000 description 1
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- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0273—Magnetic circuits with PM for magnetic field generation
- H01F7/0278—Magnetic circuits with PM for magnetic field generation for generating uniform fields, focusing, deflecting electrically charged particles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
- G01J9/02—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength by interferometric methods
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
- G01J2009/006—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength using pulses for physical measurements
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- Spectroscopy & Molecular Physics (AREA)
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- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
- Electromagnets (AREA)
Abstract
The present invention discloses an apparatus and a method for generating a uniform magnetic field, relating to the field of cold atom interference. The apparatus includes at least two segments of separated solenoids twisted around an interference region. Currents on the solenoids are mutually independent, so that the uniform magnetic field can be generated in an axial direction of the interference region. The uniform magnetic field can be formed in the axial direction of the interference region, so that a uniform range of an axial magnetic field inside the solenoid is expanded.
Description
Technical field
The present invention relates to cold atom and interfere field, particularly to a kind of for producing uniform magnetic field
Apparatus and method.
Background technology
Cold atom interferometry device utilizes the undulatory property of atom to the physics such as acceleration, angular velocity
Amount carries out accurate measurement, plays non-in fields such as gravity measurement, inertial navigation, scientific researches
The most important role.Compared with conventional apparatus, during due to work, need not the movement of element, institute
With its reliability and resolution, all relatively the former has greatly improved space.Technically compare at present
Ripe cold atom interferometer is all based on pulse raman laser mode.
Pulsed light Raman interferometer utilize the hyperfine structure energy inter-stage of atomic ground state be excited draw
Graceful transition realizes the beam splitting to atomic wave, inverts, closes the coherent operations such as bundle, thus realizes
Atom interference between two paths.When the impact of other system effect can be ignored, its position
Difference can be expressed as:WhereinFor significant wave vector,Add for be measured
Speed, T is freely to develop the time.
But in systems in practice, the impact of interferometer phase is constantly present by extraneous factor,
The particularly impact in magnetic field.In outside magnetic field, the atomic energy level that angular quantum number is not zero will
There is Zeeman splitting.Even if atom is prepared in magnetic quantum number mf=0 by the method selected by state
State on, second order Zeemen effect yet suffers from.Therefore generally interference device is placed in magnetic shield
Between, reduce the external magnetic field impact on interferometer.However, to ensure that atom is at the quantum determined
Transition between state, needs an additional constant magnetic field to be used as quantization axle.
Produce stationary magnetic field most common method be through close around energization solenoid method, as
Shown in Fig. 1.The advantage of this device is simple in construction, it is only necessary in coil logical one constant
Electric current, axis centre magnetic field is the most uniform.As Fig. 2 A shows, this device
Shortcoming is, near solenoid two ends, magnetic field intensity significantly reduces, and magnetic field's regularity relies on
In wire close around the uniformity.
For making the axial magnetic field of interference region have bigger homogeneity range, it is to avoid solenoid two ends
Neighbouring magnetic field intensity significantly reduces, and can use the method increasing solenoid length, such as Fig. 2 B
Show.This method only when solenoidal length diameter group is much larger axial magnetic field just have relatively
Big homogeneity range, and the magnetic field that solenoid produces influences whether the normal of cooling zone and detecting area
Work, and the overall structure of cold atom interferometer seems too fat to move.
In cold atom interferes accurate measurement, so that compact conformation, usual interference region is with cold
But district and detecting area can from close.And cooling zone needs to install laser cooling light cylinder, detecting area
Need detector is installed.This results in solenoidal length can not be oversize, or can not close around.
Both of these case all can cause magnetic field on central axis uniform not, thus affects the accurate of measurement
Degree.
Summary of the invention
It is an object of the invention to propose a kind of apparatus and method for producing uniform magnetic field,
At the uniform magnetic field that is axially formed of interference region, thus the internal axial magnetic of solenoid can be expanded
The homogeneity range of field.
An aspect according to embodiments of the present invention, it is provided that a kind of dress for producing uniform magnetic field
Put, it is characterised in that include at least two sections be wrapped in around the interference region spiral shells being separated from each other
Spool, wherein: the electric current on each solenoid is separate, in order at the axis of interference region
Uniform magnetic field is generated on direction.
In certain embodiments, each section of solenoidal axis overlaps with the axis of interference region.
In certain embodiments, every section of solenoid produces on axis magnetic field intensity and this helical
Electric current on pipe and the coordinate at this solenoid center and solenoidal physical dimension are associated.
In certain embodiments, on interference region axis, the magnetic field intensity of any point is each section of helical
Pipe is in the summation of this produced magnetic field intensity of point.
In certain embodiments, i-th section of solenoid magnetic field intensity B that x point produces on axisi(x)
For
Wherein, IiRepresent the current intensity in i-th section of solenoid, μ0Represent permeability of vacuum, n
Representing the coil turn of i-th solenoid unit length, l represents the length of interference region, R table
Show i-th section of solenoidal radius, xiRepresent the coordinate at i-th section of solenoid center.
An aspect according to embodiments of the present invention, it is provided that a kind of side for producing uniform magnetic field
Method, it is characterised in that including: be wound around at least two sections of spiral shells being separated from each other around interference region
Spool；Separate electric current is provided, in order in the axis side of interference region for each solenoid
Upwards generate uniform magnetic field.
In certain embodiments, each section of solenoidal axis is set to the axis with interference region
Overlap.
In certain embodiments, every section of solenoid produces on axis magnetic field intensity and this helical
Electric current on pipe and the coordinate at this solenoid center and solenoidal physical dimension are associated.
In certain embodiments, on interference region axis, the magnetic field intensity of any point is each section of helical
Pipe is in the summation of this produced magnetic field intensity of point.
In certain embodiments, i-th section of solenoid magnetic field intensity B that x point produces on axisi(x)
For
Wherein, IiRepresent the current intensity in i-th section of solenoid, μ0Represent permeability of vacuum, n
Representing the coil turn of i-th solenoid unit length, l represents the length of interference region, R table
Show i-th section of solenoidal radius, xiRepresent the coordinate at i-th section of solenoid center.
The present invention passes through to provide separate electricity at least two sections of solenoids being separated from each other
Stream, at the uniform magnetic field that is axially formed of interference region, thus can expand solenoid inner shaft
To the homogeneity range in magnetic field.
By detailed description to the exemplary embodiment of the present invention referring to the drawings, the present invention
Further feature and advantage will be made apparent from.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will
The accompanying drawing used required in embodiment or description of the prior art is briefly described, it is clear that
Ground, the accompanying drawing in describing below is only some embodiments of the present invention, skill common for this area
From the point of view of art personnel, on the premise of not paying creative work, it is also possible to obtain according to these accompanying drawings
Obtain other accompanying drawing.
Fig. 1 illustrates that energization solenoid produces the schematic diagram in magnetic field.
Fig. 2 A goes out to be used for energization solenoid the signal of a kind of mode of cold atom interferometer interference region
Figure.
Fig. 2 B goes out to be used for energization solenoid showing of the another way of cold atom interferometer interference region
It is intended to.
Fig. 3 illustrates that the present invention shows for the structure producing an embodiment of the device of uniform magnetic field
It is intended to.
Fig. 4 goes out the present invention for producing the uniform magnetic field of an embodiment of the device of uniform magnetic field
Generate result.
Fig. 5 goes out the present invention and illustrates for the flow process producing an embodiment of the method for uniform magnetic field
Figure.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, to the technical scheme in the embodiment of the present invention
It is clearly and completely described, it is clear that described embodiment is only that a part of the present invention is real
Execute example rather than whole embodiments.Description at least one exemplary embodiment is actual below
On be merely illustrative, never as to the present invention and application thereof or any restriction of use.Base
Embodiment in the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, broadly falls into the scope of protection of the invention.
Fig. 3 illustrates that the present invention shows for the structure producing an embodiment of the device of uniform magnetic field
It is intended to.The present embodiment is at the uniform magnetic field that is axially formed of interference region, thus expands solenoid
The homogeneity range of internal axial magnetic field.As it is shown on figure 3, this embodiment be used for produce uniform magnetic
The device 30 of field includes:
The solenoid that at least two sections be wrapped in around interference region are separated from each other, wherein:
Electric current on each solenoid is separate, in order to raw on the axis direction of interference region
Uniformly magnetic field.
Such as, a kind of concrete implementation mode is, is wound around four sections and mutually divides around interference region
From solenoid, i.e. solenoid 31, solenoid 32, solenoid 33 and solenoid 34, often
Electric current on section solenoid is separate, each section of solenoid energy on the axis direction of interference region
Enough superpositions generate uniform magnetic field.
It will be understood by those skilled in the art that each section of solenoidal hot-wire coil number of turn being separated from each other
Can have multiple set-up mode, Fig. 3 illustrate only the number of turn of each hot-wire coil and has that
A kind of situation of these different radially numbers of turn or the axially number of turn, i.e. axial 2 circles of solenoid 31, helical
Axial 4 circles of pipe 32, axial 3 circles of solenoid 33, axial 1 circle of solenoid 34；Each energising
Coil can have the number of turn of the identical number of turn, such as each hot-wire coil be radially 5 circles,
Axial 12 circles.
Additionally, each section of solenoidal position that arranges being separated from each other is not do particular restriction.Example
As, with one end of solenoid axis as zero, solenoid 31 centre bit in above-described embodiment
The axial coordinate put is 35 millimeters, the axial coordinate of solenoid 32 center is 256 millimeters,
The axial coordinate of solenoid 33 center is 390 millimeters, the axle of solenoid 34 center
It it is 610 millimeters to coordinate.
In a practical situation, the laser for making cold atom interferometer produce in the course of the work can
To penetrate interference region, hot-wire coil can be wrapped in the internal axle with interference region of interference region
On several fixing bars that line is parallel.
Above-described embodiment is by providing separate at least two sections of solenoids being separated from each other
Electric current, at the uniform magnetic field that is axially formed of interference region, thus can expand in solenoid
The homogeneity range of portion's axial magnetic field.
The electric current that each section of solenoid being separated from each other is corresponding is separate, the value of its current intensity
Can be determined by various ways such as exhaustive, tests.Describe below by an embodiment
How to determine electric current separate in each section of solenoid being separated from each other.
For the ease of calculating, each section of solenoid can be advised by the present embodiment according to certain mode
Then arrange, so that the axis of each section of solenoidal axis and interference region overlaps.So
One, the magnetic field intensity that every section of solenoid produces on axis and the electric current on this solenoid and should
Coordinate and the solenoidal physical dimension at solenoid center are associated.Such as, i-th section of helical
Pipe magnetic field intensity B that x point produces on axisi(x) be
Wherein, IiRepresent the current intensity in i-th section of solenoid, μ0Represent permeability of vacuum, n
Representing the coil turn of i-th solenoid unit length, l represents the length of interference region, R table
Show i-th section of solenoidal radius, xiRepresent the coordinate at i-th section of solenoid center.
Owing to each section of energization solenoid all can produce corresponding magnetic field on interference region axis, because of
On this interference region axis, the magnetic field intensity of any point is produced magnetic field by each section of solenoid at this point
The summation of intensity.The most each section of solenoid magnetic field intensity summation B (x) that x point produces on axis is
Assume B0Represent magnetic field of the goal, define error of fitting Λ, orderIts
In, xjFor the axial coordinate of solenoid sample point on axis, m is that solenoid is on axis
The total number of sample point.It is desirable that each section of solenoid magnetic that each sample point produces on axis
The value of field intensity summation B (x) approaches constant B as far as possible0, i.e. error of fitting Λ is minimum.For
This, can use nonlinear regression algo, tries to achieve each section of spiral shell when error of fitting Λ takes minima
Current intensity I in spooli。
Still as a example by the solenoid in first embodiment, for making the axial seat of interference region
The uniform magnetic field of 0.2 Gauss is formed, at coordinate in being designated as the region of 150 millimeters to 450 millimeters
Overall length 300 millimeters is uniformly arranged 300 sample points, each sampling on the axis in the range of this
It is spaced 1 millimeter between point.Then tried to achieve when error of fitting Λ takes minimum by correlation computations software
During value, the current intensity in solenoid 31 is 0.0929 ampere, and the current intensity of pipe 32 is
0.0464 ampere, the current intensity in solenoid 31 is 0.0379 ampere, in solenoid 31
Current intensity be 0.1044 ampere.Each section of solenoid forms magnetic field on solenoid axis
Actual result is as shown in Figure 4.Owing to using nonlinear regression algo to try to achieve electricity by software for calculation
The process of intensity of flow is prior art, does not do too much repeating at this.
Present invention also offers a kind of method for producing uniform magnetic field.Retouch below in conjunction with Fig. 5
State the method.
Fig. 5 illustrates that the present invention shows for the flow process producing an embodiment of the method for uniform magnetic field
It is intended to.As it is shown in figure 5, the method comprises the following steps:
Step S502, is wound around at least two sections of solenoids being separated from each other around interference region；
Step S504, provides separate electric current for each solenoid, in order at interference region
Uniform magnetic field is generated on the axis direction in territory.
Said method is by providing separate at least two sections of solenoids being separated from each other
Electric current, at the uniform magnetic field that is axially formed of interference region, thus can expand inside solenoid
The homogeneity range of axial magnetic field.
In step S502, each section of solenoidal axis can be set to and interference region
Axis overlaps.
Optionally, the magnetic field intensity that every section of solenoid produces on axis and the electricity on this solenoid
Stream and the coordinate at this solenoid center and solenoidal physical dimension are associated.
Optionally, on interference region axis, the magnetic field intensity of any point is that each section of solenoid is at this point
The summation of produced magnetic field intensity.
Optionally, i-th section of solenoid magnetic field intensity B that x point produces on axisi(x) be
Wherein, IiRepresent the current intensity in i-th section of solenoid, μ0Represent permeability of vacuum, n
Representing the coil turn of i-th solenoid unit length, l represents the length of interference region, R table
Show i-th section of solenoidal radius, xiRepresent the coordinate at i-th section of solenoid center.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Within the spirit of invention and principle, any modification, equivalent substitution and improvement etc. made, all should wrap
Within being contained in protection scope of the present invention.
Claims (10)
1. the device being used for producing uniform magnetic field, it is characterised in that include being wrapped in interference
The solenoid that around region at least two sections are separated from each other, wherein:
Electric current on each solenoid is separate, in order to raw on the axis direction of interference region
Uniformly magnetic field.
Device the most according to claim 1, it is characterised in that
Each section of solenoidal axis overlaps with the axis of interference region.
Device the most according to claim 1, it is characterised in that
The magnetic field intensity that every section of solenoid produces on axis and the electric current on this solenoid and this spiral shell
Coordinate and the solenoidal physical dimension at spool center are associated.
Device the most according to claim 3, it is characterised in that
On interference region axis, the magnetic field intensity of any point is produced magnetic by each section of solenoid at this point
The summation of field intensity.
5. according to the device according to any one of claim 1-4, it is characterised in that
I-th section of solenoid magnetic field intensity B that x point produces on axisi(x) be
Wherein, IiRepresent the current intensity in i-th section of solenoid, μ0Represent permeability of vacuum, n
Representing the coil turn of i-th solenoid unit length, l represents the length of interference region, R table
Show i-th section of solenoidal radius, xiRepresent the coordinate at i-th section of solenoid center.
6. the method being used for producing uniform magnetic field, it is characterised in that including:
At least two sections of solenoids being separated from each other it are wound around around interference region；
Separate electric current is provided, in order at the axis direction of interference region for each solenoid
The uniform magnetic field of upper generation.
Method the most according to claim 6, it is characterised in that
The axis that each section of solenoidal axis is set to interference region is overlapped.
Method the most according to claim 6, it is characterised in that
The magnetic field intensity that every section of solenoid produces on axis and the electric current on this solenoid and this spiral shell
Coordinate and the solenoidal physical dimension at spool center are associated.
Method the most according to claim 8, it is characterised in that
On interference region axis, the magnetic field intensity of any point is produced magnetic by each section of solenoid at this point
The summation of field intensity.
10. according to the method according to any one of claim 6-9, it is characterised in that
I-th section of solenoid magnetic field intensity B that x point produces on axisi(x) be
Wherein, IiRepresent the current intensity in i-th section of solenoid, μ0Represent permeability of vacuum, n
Representing the coil turn of i-th solenoid unit length, l represents the length of interference region, R table
Show i-th section of solenoidal radius, xiRepresent the coordinate at i-th section of solenoid center.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610537023.5A CN105957687B (en) | 2016-07-08 | 2016-07-08 | Device and method for generating uniform magnetic field |
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| CN201610537023.5A CN105957687B (en) | 2016-07-08 | 2016-07-08 | Device and method for generating uniform magnetic field |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108267791A (en) * | 2018-02-09 | 2018-07-10 | 中国科学技术大学 | A kind of field system for atomic interferometer probe |
| CN108364745A (en) * | 2018-04-16 | 2018-08-03 | 武汉钢铁有限公司 | The enhancing compensation method of generation uniform magnetic field and device and its application method |
| CN109631751A (en) * | 2018-12-12 | 2019-04-16 | 中国船舶重工集团公司第七〇七研究所 | A kind of output of high-frequency without dead zone cold atom interferometer |
| CN112857361A (en) * | 2021-01-06 | 2021-05-28 | 哈尔滨工业大学（深圳） | Method, device and equipment for separating multi-solenoid magnetic field signals and readable storage medium |
| CN117015224A (en) * | 2023-09-28 | 2023-11-07 | 国网江苏省电力有限公司营销服务中心 | Electromagnetic shielding device and system for keeping superconducting state of Josephson junction |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108267791A (en) * | 2018-02-09 | 2018-07-10 | 中国科学技术大学 | A kind of field system for atomic interferometer probe |
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| CN108364745A (en) * | 2018-04-16 | 2018-08-03 | 武汉钢铁有限公司 | The enhancing compensation method of generation uniform magnetic field and device and its application method |
| CN109631751A (en) * | 2018-12-12 | 2019-04-16 | 中国船舶重工集团公司第七〇七研究所 | A kind of output of high-frequency without dead zone cold atom interferometer |
| CN109631751B (en) * | 2018-12-12 | 2021-05-14 | 中国船舶重工集团公司第七一七研究所 | High-frequency output no-dead-zone cold atom interferometer |
| CN112857361A (en) * | 2021-01-06 | 2021-05-28 | 哈尔滨工业大学（深圳） | Method, device and equipment for separating multi-solenoid magnetic field signals and readable storage medium |
| CN112857361B (en) * | 2021-01-06 | 2023-03-07 | 哈尔滨工业大学（深圳） | Method, device and equipment for separating multi-solenoid magnetic field signals and readable storage medium |
| CN117015224A (en) * | 2023-09-28 | 2023-11-07 | 国网江苏省电力有限公司营销服务中心 | Electromagnetic shielding device and system for keeping superconducting state of Josephson junction |
| CN117015224B (en) * | 2023-09-28 | 2024-02-20 | 国网江苏省电力有限公司营销服务中心 | Electromagnetic shielding device and system for keeping superconducting state of Josephson junction |
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| Publication number | Publication date |
|---|---|
| CN105957687B (en) | 2018-09-14 |
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