CN107464653A - A kind of low-field nuclear magnetic resonance probe magnet structure for possessing magnetic field switching function - Google Patents
A kind of low-field nuclear magnetic resonance probe magnet structure for possessing magnetic field switching function Download PDFInfo
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- CN107464653A CN107464653A CN201710600291.1A CN201710600291A CN107464653A CN 107464653 A CN107464653 A CN 107464653A CN 201710600291 A CN201710600291 A CN 201710600291A CN 107464653 A CN107464653 A CN 107464653A
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- Prior art keywords
- ring magnet
- magnet
- outer ring
- inner ring
- low
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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]
- H01F7/0205—Magnetic circuits with PM in general
- H01F7/021—Construction of PM
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/383—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0205—Magnetic circuits with PM in general
- H01F7/0226—PM with variable field strength
Abstract
The invention discloses a kind of low-field nuclear magnetic resonance probe magnet structure for possessing magnetic field switching function, including outer ring magnet (1) and inner ring magnet (2), outer ring magnet (1) to be sheathed on inner ring magnet (2) outside.This possesses the outer ring magnet of the low-field nuclear magnetic resonance probe magnet structure of magnetic field switching function and inner ring magnet produces same uniform magnetic field distribution inside probe.When carrying out Nuclear Magnetic Resonance Measurement, after the magnetostatic field of outer ring magnet and inner ring magnet is overlapped mutually, equal to the magnetic field intensity of design；When measurement terminates or needs interim " closing " magnetostatic field, outer ring magnet is in the drive backspin turnback of motor, and now magnetic field intensity caused by inner and outer ring magnet is identical, but in the opposite direction, so as to cancel out each other, now will be no longer magnetized into the sample inside magnetic field.
Description
Technical field
The present invention relates to low-field nuclear magnetic resonance apparatus field, a kind of particularly low field nuclear-magnetism for possessing magnetic field switching function
Resonance probe magnet structure.
Background technology
The innovation of Nuclear Magnetic Resonance Measurement technology and methods for using them is using instrument research and development as support.In recent years, new low field nuclear-magnetism
Resonance probe magnet new construction continues to bring out, and is provided different from medical science high field MRI (magnetic resonance imaging) with superconducting coil and produces core
Magnetostatic field necessary to electromagnetic induction phenomenon, low-field nuclear magnetic resonance probe are used as magnetostatic field source using permanent magnet material.Compared to
Medical MRI, the low-field nuclear magnetic resonance apparatus volume to be grown up based on permanent magnet material is smaller, cheap, but its magnet material
Material characteristic also determines that it can not control when magnetic field produces and disappear as MRI, i.e., " switch " characteristic for not possessing magnetic field.
This causes low-field nuclear magnetic resonance apparatus usually especially careful when putting, and prevents that metallics is close.It is in addition, special at some
Use environment in, it is expected magnetostatic field energy temporary extinction, such as online/motion measurement when, when sample includes paramagnetism gold
Category section or exist it is some can not be positioned in magnetic field electronic component when, within this period of this section by probe it is necessary to
Probe is asked to launch magnetostatic field.
The content of the invention
In order that low-field nuclear magnetic resonance equipment has switching function, possesses magnetic field switching function the invention provides a kind of
Low-field nuclear magnetic resonance probe magnet structure, this possesses the outer shroud magnetic of the low-field nuclear magnetic resonance probe magnet structure of magnetic field switching function
Body and inner ring magnet produce same uniform magnetic field distribution inside probe.When carrying out Nuclear Magnetic Resonance Measurement, outer ring magnet and
After the magnetostatic field of inner ring magnet is overlapped mutually, equal to the magnetic field intensity of design；Terminate or need interim " closing " in measurement
During magnetostatic field, outer ring magnet is in the drive backspin turnback of motor, and now magnetic field intensity caused by inner and outer ring magnet is identical, but
In the opposite direction, so as to cancel out each other, now will be no longer magnetized into the sample inside magnetic field.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of low-field nuclear magnetic resonance probe magnet structure for possessing magnetic field switching function, including outer ring magnet and inner ring magnetic
Body, outer ring magnet and inner ring magnet structure cylindrical in shape, outer ring magnet are sheathed on outside inner ring magnet, and outer ring magnet can be relative to
Inner ring magnet rotation, in the column structure that surrounds of inner surface of inner ring magnet, when the low-field nuclear magnetic resonance probe magnet structure
During in measuring state, outer ring magnet and inner ring magnet can be in the magnetic induction intensity all sames of any one point, when outer shroud magnetic
When body phase is for 180 ° of inner ring magnet rotation, outer ring magnet and inner ring magnet are superposed to 0B in the magnetic induction intensity of the point.
Outer ring magnet and inner ring magnet are columnar structured, the center line of outer ring magnet and the center line weight of inner ring magnet
Close.
Along the centerline direction of outer ring magnet, the length of outer ring magnet is identical with the length of inner ring magnet, outer ring magnet
Both ends correspond to concordant with the both ends of inner ring magnet.
The center line of outer ring magnet and the center line of inner ring magnet overlap, and along the circumference of outer ring magnet, outer ring magnet contains
Multiple outer prisms of uniform intervals arrangement, the centerline parallel of the center line of each outer prism with outer ring magnet, each outer rib
The distance of the center line of post to outer ring magnet center line is equal.
The section of outer prism is octagon.
Along the circumference of inner ring magnet, inner ring magnet contains multiple interior prisms of uniform intervals arrangement, each in interior prism
Centerline parallel of the heart line with inner ring magnet, the distance of center line to the inner ring magnet center line of each interior prism are equal.
The section of interior prism is octagon, and the cross-sectional area of interior prism is less than the cross-sectional area of outer prism.
Outer ring magnet and inner ring magnet are Halbach magnets.
This possess low-field nuclear magnetic resonance probe magnet structure of magnetic field switching function also contain be used to driving outer ring magnet or
The driving part of inner ring magnet rotation.
This possess low-field nuclear magnetic resonance probe magnet structure of magnetic field switching function also contain be used to supporting outer ring magnet and
The support of inner ring magnet.
The beneficial effects of the invention are as follows：This possesses the outer shroud of the low-field nuclear magnetic resonance probe magnet structure of magnetic field switching function
Magnet and inner ring magnet produce same uniform magnetic field distribution inside probe.When carrying out Nuclear Magnetic Resonance Measurement, outer ring magnet
After being overlapped mutually with the magnetostatic field of inner ring magnet, equal to the magnetic field intensity of design；Terminate in measurement or need interim " close
Close " magnetostatic field when, outer ring magnet is in the drive backspin turnback of motor, and now magnetic field intensity caused by inner and outer ring magnet is identical,
But it is in opposite direction, so as to cancel out each other, now will be no longer magnetized into the sample inside magnetic field.
Brief description of the drawings
The Figure of description for forming the part of the application is used for providing a further understanding of the present invention, and of the invention shows
Meaning property embodiment and its illustrate be used for explain the present invention, do not form inappropriate limitation of the present invention.
Fig. 1 be the low-field nuclear magnetic resonance probe magnet structure of the present invention for possessing magnetic field switching function outer ring magnet and
Inner ring magnet is bicyclic toroidal coilses structure and the schematic diagram in measuring state.
Fig. 2 be the low-field nuclear magnetic resonance probe magnet structure of the present invention for possessing magnetic field switching function outer ring magnet and
Inner ring magnet be bicyclic toroidal coilses structure and in off position when schematic diagram.
Fig. 3 is that the stereoscopic-state of the low-field nuclear magnetic resonance probe magnet structure of the present invention for possessing magnetic field switching function shows
It is intended to.
Fig. 4 be the low-field nuclear magnetic resonance probe magnet structure of the present invention for possessing magnetic field switching function outer ring magnet and
Inner ring magnet is Halbach magnet structures and the schematic diagram in measuring state.
Fig. 5 be the low-field nuclear magnetic resonance probe magnet structure of the present invention for possessing magnetic field switching function outer ring magnet and
Inner ring magnet be Halbach magnet structures and in off position when schematic diagram.
Fig. 6 is bicyclic toroidal coilses structure or schematic diagram when Halbach magnet structures are prism.
1st, outer ring magnet；
2nd, inner ring magnet；
3rd, outer prism；
4th, interior prism；
5th, motor；
6th, magnetic direction.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
A kind of low-field nuclear magnetic resonance probe magnet structure for possessing magnetic field switching function, including outer ring magnet 1 and inner ring magnetic
Body 2, outer ring magnet 1 and the structure cylindrical in shape of inner ring magnet 2, outer ring magnet 1 are sheathed on outside inner ring magnet 2, and outer ring magnet 1 can
Relative to the rotation of inner ring magnet 2, in the column structure that surrounds of inner surface of inner ring magnet 2, when the low-field nuclear magnetic resonance probe
When magnet structure is in measuring state, outer ring magnet 1 and inner ring magnet 2 can be in any one point (A in such as Fig. 1 and Fig. 4
Point) magnetic induction intensity all same, i.e., outer ring magnet 1 and inner ring magnet 2 can any one point magnetic field size and side
To all same, if outer ring magnet 1 and inner ring magnet 2 in the magnetic induction intensity of the point are x1B, outer ring magnet 1 and inner ring magnet 2
2x is superposed in the magnetic induction intensity of the point1B, when outer ring magnet 1 is relative to 180 ° of 2 rotation of inner ring magnet, outer ring magnet 1
Identical but in opposite direction with size of the inner ring magnet 2 in the magnetic field of the point, such outer ring magnet 1 and inner ring magnet 2 are in the point
Magnetic induction intensity is superposed to 0B, as shown in Figures 1 to 5.
Specifically, outer ring magnet 1 and inner ring magnet 2 produce same equally distributed magnetic field inside probe.Carry out
During Nuclear Magnetic Resonance Measurement, as shown in Figure 1 and Figure 4, after the magnetostatic field of outer ring magnet 1 and inner ring magnet 2 is overlapped mutually, equal to design
Required magnetic field intensity, i.e., above-mentioned 2x1B is equal to the magnetic induction intensity needed；Terminate in measurement or need interim " closing " magnetostatic field
When, outer ring magnet 1 is in the drive backspin turnback of driving part (such as motor 5), now magnetic field intensity caused by inner and outer ring magnet
It is identical, but in the opposite direction, so as to cancel out each other, now will be no longer magnetized into the sample inside magnetic field.
In the prior art, low-field nuclear magnetic resonance apparatus probe is with ferrimagnet (neodymium iron boron, SmCo, ferrite etc.)
To launch magnetostatic field.In order to improve the signal to noise ratio of NMR signal, this magnetostatic field is typically uniform magnetic field, to measure relaxation
Time (longitudinal relaxation time T1, T2 T2) based on；Sometimes for obtaining some special parameter (such as diffusion coefficients
D), also uniform gradient magnetic field can be applied in probe detection region by the design of magnet structure.Different detected objects is tackled,
Generally require to design different magnetic field intensities, such as measurement pore media generally selects 2 MHz magnetic field, to reduce inner gradient
Optimal signal to noise ratio is obtained while field；And higher magnetic field intensity is generally selected when measuring fluid sample, it is strong to improve signal
Degree.However, using which kind of magnet structure, and which kind of magnetostatic field applied, used ferromagnetic material fills in advance all in accordance with design
Magnetic is once magnetized and finished to setting magnetic field intensity, and magnet will keep this intensity that magnetizes forever.This causes low-field nuclear magnetic resonance
The magnet of probe does not have magnetostatic field " switch " function, i.e., regardless of whether being in measuring state, magnetostatic field exists all the time.
At present, the indoor conventional low-field nuclear magnetic resonance probe magnet structure using interior hairdo uniform magnetic field mainly has three
Kind：C-type magnet (also known as bipolar plates magnet, U-shaped magnet) structure, toroidal magnet structure, Halbach magnet structures.C-type magnet knot
Structure is internally formed uniform magnetic field using 2 pieces of plate shaped, magnets at it, simple in construction easily manufactured and installed, but probe size compared with
Greatly, effective " switch control is temporarily carried out to its magnetic field without good method." toroidal magnet structure and Halbach (Haier
Bake) magnet structure compare c-type magnet structure for volume-diminished it is a lot, probe sensitizing range it is bigger, so application more
Extensively.The present invention is directed to toroidal magnet structure and Halbach magnet structures, proposes the novel bicyclic with magnetic field " switch " function
Magnet structure.I.e. outer ring magnet 1 and inner ring magnet 2 are above-mentioned existing toroidal magnet structure, or, outer ring magnet 1 and interior
Ring magnet 2 is above-mentioned existing Halbach magnet structures.
In the present embodiment, outer ring magnet 1 and inner ring magnet 2 can be bicyclic toroidal coilses structure, such as Fig. 1 to Fig. 3
Shown, outer ring magnet 1 and inner ring magnet 2 are the columnar structured of standard, the center line of outer ring magnet 1 and inner ring magnet 2
Center line overlaps.Along the centerline direction of outer ring magnet 1, the length of outer ring magnet 1 is identical with the length of inner ring magnet 2, outer shroud
The both ends of magnet 1 correspond to concordant with the both ends of inner ring magnet 2.Outer ring magnet 1 can rotation, i.e. outer ring magnet 1 can be with outer shroud
The center line of magnet 1 rotates for axis, and inner ring magnet 2 can not rotate.
By the finite element modelling in magnetic field, outer ring magnet 1 and inner ring magnet 2 can be any one inside magnet in separation
Point produces identical distribution of static magnetic field x1B, when the two is nested in the same direction, magnetostatic field is superposed to 2x1B, as shown in figure 1,2x1B is equal to
The magnetic field intensity of design.The now work of the effect of bicyclic magnet (outer ring magnet 1 and inner ring magnet 2) and the monocyclic magnet of tradition
With identical, the as generation of nmr phenomena provides homogeneous static magnetic field.When needing " closing " magnetostatic field, motor 5 drives outer
Ring magnet 1 rotates 180 degree, makes outer ring magnet 1 identical but in opposite direction with static magnetic field strength caused by inner ring magnet 2, so as to support
Disappear internal magnetostatic field, as shown in Fig. 2 the i.e. now superposition of outer ring magnet 1 and inner ring magnet 2 in the magnetic induction intensity of the point
For 0B.Similarly, it is necessary to when " opening " magnetostatic field once again, stepper motor 5 is only needed to drive outer ring magnet 1 to rotate 180 degree again, so that it may again
It is 2x that degree produces magnetic field intensity inside magnet1B homogeneous static magnetic field.
In the present embodiment, outer ring magnet 1 and inner ring magnet 2 may each be columnar Halbach magnet structures.With ring
Unlike shape magnet, Halbach magnet structures are made up of the different many small magnetic patch of magnetizing direction, and its outside zero leakage
Magnetic design makes its application wider compared with toroidal magnet.The technology effect of the magnetostatic field " switch " of bicyclic Halbach magnet structures
Fruit and the course of work are identical with toroidal magnet structure, are equally to have motor 5 to drag the rotation of outer ring magnet 1 to realize inside
" switch " in magnetic field, the present invention are no longer discussed in detail.
In the present embodiment, the structure of outer ring magnet 1 and inner ring magnet 2 can be with as shown in fig. 6, outer ring magnet 1 and interior
Ring magnet 2 is Halbach magnet structures, and the center line of outer ring magnet 1 and the center line of inner ring magnet 2 overlap, along outer shroud magnetic
The circumference of body 1, multiple outer prisms 3 that outer ring magnet 1 arranges containing uniform intervals, the center line of each outer prism 3 is and outer shroud
The centerline parallel of magnet 1, the distance of center line to the center line of outer ring magnet 1 of each outer prism 3 are equal.Outer prism 3
Section is octagon.Along the circumference of inner ring magnet 2, multiple interior prisms 4 that inner ring magnet 2 arranges containing uniform intervals, each
Centerline parallel of the center line of interior prism 4 with inner ring magnet 2, it is each in prism 4 center line to the center line of inner ring magnet 2
Distance it is equal.The section of interior prism 4 is octagon, and the cross-sectional area of interior prism 4 is less than the cross-sectional area of outer prism 3.
The quantity of interior prism 4 is identical with the quantity of outer prism 3.
It is used to support outer shroud magnetic in addition, the low-field nuclear magnetic resonance probe magnet structure for possessing magnetic field switching function also contains
The support of body 1 and inner ring magnet 2.
It is described above, it is only the specific embodiment of the present invention, it is impossible to the scope implemented is invented with its restriction, so it is equivalent
The displacement of component, or the equivalent variations made according to scope of patent protection of the present invention and modification, it should all still fall within what this patent was covered
Category.In addition, between technical characteristic and technical characteristic in the present invention, between technical characteristic and technical scheme, technical scheme with
It can be used between technical scheme with independent assortment.
Claims (10)
1. a kind of low-field nuclear magnetic resonance probe magnet structure for possessing magnetic field switching function, it is characterised in that described to possess magnetic field
The low-field nuclear magnetic resonance probe magnet structure of switching function includes outer ring magnet (1) and inner ring magnet (2), outer ring magnet (1) and
Inner ring magnet (2) structure cylindrical in shape, outer ring magnet (1) are sheathed on inner ring magnet (2) outside, and outer ring magnet (1) can be relative to
Inner ring magnet (2) rotation, in the column structure that surrounds of inner surface of inner ring magnet (2), when the low-field nuclear magnetic resonance probe magnetic
When body structure is in measuring state, outer ring magnet (1) and inner ring magnet (2) can be homogeneous in the magnetic induction intensity that any one is put
Together, when outer ring magnet (1) is relative to 180 ° of inner ring magnet (2) rotation, outer ring magnet (1) and inner ring magnet (2) are in the point
Magnetic induction intensity is superposed to 0B.
2. the low-field nuclear magnetic resonance probe magnet structure according to claim 1 for possessing magnetic field switching function, its feature exist
Be in, outer ring magnet (1) and inner ring magnet (2) it is columnar structured, the center line of outer ring magnet (1) and inner ring magnet (2)
Center line overlaps.
3. the low-field nuclear magnetic resonance probe magnet structure according to claim 2 for possessing magnetic field switching function, its feature exist
In along the centerline direction of outer ring magnet (1), the length of outer ring magnet (1) is identical with the length of inner ring magnet (2), outer shroud magnetic
The both ends of body (1) correspond to concordant with the both ends of inner ring magnet (2).
4. the low-field nuclear magnetic resonance probe magnet structure according to claim 1 for possessing magnetic field switching function, its feature exist
In the center line of outer ring magnet (1) and the center line of inner ring magnet (2) overlap, along the circumference of outer ring magnet (1), outer ring magnet
(1) multiple outer prisms (3) containing uniform intervals arrangement, the center of the center line of each outer prism (3) with outer ring magnet (1)
Line is parallel, and the distance of center line to outer ring magnet (1) center line of each outer prism (3) is equal.
5. the low-field nuclear magnetic resonance probe magnet structure according to claim 4 for possessing magnetic field switching function, its feature exist
In the section of outer prism (3) is octagon.
6. the low-field nuclear magnetic resonance probe magnet structure according to claim 4 for possessing magnetic field switching function, its feature exist
In, along the circumference of inner ring magnet (2), multiple interior prisms (4) that inner ring magnet (2) arranges containing uniform intervals, it is each in prism
(4) centerline parallel of the center line with inner ring magnet (2), it is each in prism (4) center line to inner ring magnet (2) center
The distance of line is equal.
7. the low-field nuclear magnetic resonance probe magnet structure according to claim 6 for possessing magnetic field switching function, its feature exist
In the section of interior prism (4) is octagon, and the cross-sectional area of interior prism (4) is less than the cross-sectional area of outer prism (3).
8. the low-field nuclear magnetic resonance probe magnet structure according to claim 1 for possessing magnetic field switching function, its feature exist
In outer ring magnet (1) and inner ring magnet (2) are Halbach magnets.
9. the low-field nuclear magnetic resonance probe magnet structure according to claim 1 for possessing magnetic field switching function, its feature exist
In the low-field nuclear magnetic resonance probe magnet structure for possessing magnetic field switching function, which also contains, to be used to drive outer ring magnet (1) or interior
The driving part of ring magnet (2) rotation.
10. the low-field nuclear magnetic resonance probe magnet structure according to claim 1 for possessing magnetic field switching function, its feature exist
In this, which possesses low-field nuclear magnetic resonance probe magnet structure of magnetic field switching function and also contained, is used to supporting outer ring magnet (1) and interior
The support of ring magnet (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710600291.1A CN107464653A (en) | 2017-07-21 | 2017-07-21 | A kind of low-field nuclear magnetic resonance probe magnet structure for possessing magnetic field switching function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710600291.1A CN107464653A (en) | 2017-07-21 | 2017-07-21 | A kind of low-field nuclear magnetic resonance probe magnet structure for possessing magnetic field switching function |
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| CN201710600291.1A Pending CN107464653A (en) | 2017-07-21 | 2017-07-21 | A kind of low-field nuclear magnetic resonance probe magnet structure for possessing magnetic field switching function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761361A (en) * | 2018-03-28 | 2018-11-06 | 中国石油大学(北京) | Adjustable high evenness nmr sensor magnet structure and measuring device |
| CN111220937A (en) * | 2018-11-23 | 2020-06-02 | 布鲁克碧奥斯平有限公司 | Halbach magnet arrangement system with slots |
| CN112630711A (en) * | 2020-11-16 | 2021-04-09 | 中国石油大学(北京) | Magnet device and nuclear magnetic resonance equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060279391A1 (en) * | 2005-06-10 | 2006-12-14 | Beijing Taijie Magneto-Electrical Institute | Permanent magnet, magnetic device for use in MRI including the same, and manufacturing processes thereof |
| CN103163177A (en) * | 2013-03-07 | 2013-06-19 | 包头稀土研究院 | Magnetothermal effect measurement system and method |
| CN103189938A (en) * | 2010-09-23 | 2013-07-03 | 美卓自动化有限公司 | Electromagnet for low field NMR measurements and method for manufacturing thereof |
-
2017
- 2017-07-21 CN CN201710600291.1A patent/CN107464653A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060279391A1 (en) * | 2005-06-10 | 2006-12-14 | Beijing Taijie Magneto-Electrical Institute | Permanent magnet, magnetic device for use in MRI including the same, and manufacturing processes thereof |
| CN103189938A (en) * | 2010-09-23 | 2013-07-03 | 美卓自动化有限公司 | Electromagnet for low field NMR measurements and method for manufacturing thereof |
| CN103163177A (en) * | 2013-03-07 | 2013-06-19 | 包头稀土研究院 | Magnetothermal effect measurement system and method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761361A (en) * | 2018-03-28 | 2018-11-06 | 中国石油大学(北京) | Adjustable high evenness nmr sensor magnet structure and measuring device |
| CN108761361B (en) * | 2018-03-28 | 2020-01-31 | 中国石油大学(北京) | Adjustable high-uniformity nuclear magnetic resonance sensor magnet structure and measuring device |
| CN111220937A (en) * | 2018-11-23 | 2020-06-02 | 布鲁克碧奥斯平有限公司 | Halbach magnet arrangement system with slots |
| CN111220937B (en) * | 2018-11-23 | 2022-09-27 | 布鲁克碧奥斯平有限公司 | Halbach magnet arrangement system with slots |
| CN112630711A (en) * | 2020-11-16 | 2021-04-09 | 中国石油大学(北京) | Magnet device and nuclear magnetic resonance equipment |
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