CN108776317A - A kind of cylindrical core magnetic resonance probe - Google Patents
A kind of cylindrical core magnetic resonance probe Download PDFInfo
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- CN108776317A CN108776317A CN201810602646.5A CN201810602646A CN108776317A CN 108776317 A CN108776317 A CN 108776317A CN 201810602646 A CN201810602646 A CN 201810602646A CN 108776317 A CN108776317 A CN 108776317A
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- magnet
- magnetic field
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- frequency coil
- cylindrical core
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- 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
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The invention belongs to field of non destructive testing, it is related to a kind of cylindrical core magnetic resonance probe, the static magnetic field that the RF magnetic field that radio-frequency coil generates is generated with magnet angle of magnetic direction in target area is 90 ° or close to 90 °, it can be by solenoid the number of turns, the distance between two solenoids, solenoid turn-to-turn away from adjusting adjust RF magnetic field, the radius to three permanent magnets can be passed through, the adjusting of height adjusts static magnetic field, and gauze screen is wrapped up on the outside of magnet to shield alternating magnetic field, reduce influence of itself eddy current effect to RF magnetic field and radio-frequency coil AC resistance simultaneously, effectively reduce the AC resistance of radio-frequency coil, overall structure may be implemented to generate the purpose of design of the uniformity higher static magnetic field and RF magnetic field in target area, effectively improve the signal-to-noise ratio of cylindrical core magnetic resonance probe.
Description
Technical field
The invention belongs to field of non destructive testing, are related to a kind of cylindrical core magnetic resonance probe.
Background technology
An important factor for soil moisture is influence crop growth, and its content and existing forms are many in soil
The governing factor of chemistry, physics and biological process.Therefore, with regard to agricultural and environmental protection for, soil moisture detection it is important
Meaning is timely and accurately to carry out soil moisture detection, and assessment arid and wet injury degree, the limited water resource of Optimum utilization are protected
Demonstrate,prove crop yield.The quantity and size distribution in soil aperture directly decide the gas permeability of soil, water holding water retention property and
Crop root influences fertility and the crop yield of soil indirectly in the stretching, extension of soil space, therefore is carried out to soil pore structure accurate
Really assessment is of great significance.
Magnetic resonance detection technology as a kind of convenient, accurate measurement method, be widely used in soil moisture content and
The measurement of Pore structure in soil.But there are complicated, inconvenient repairs to replace for nmr probe in the prior art, and target
The smaller problem in region.
Invention content
In view of this, the purpose of the present invention is to provide a kind of cylindrical core magnetic resonance probe, ensure service life and
Under the premise of detectivity, simplify sonde configuration, expands target area.
In order to achieve the above objectives, the present invention provides the following technical solutions：
A kind of cylindrical core magnetic resonance probe, including magnet, radio-frequency coil and matching tuning circuit, the magnet are used for
Static magnetic field is generated, is coaxially stacked by three cylindrical permanent magnets, in the axial direction from one end of magnet to its offside
It is followed successively by the first magnet, the second magnet and third magnet, adjacent two permanent magnets are connected；The radio-frequency coil for generate with
The RF magnetic field of the magnetic direction intersection of static magnetic field, the radio-frequency coil are composed in series by two opposite solenoids of rotation direction,
It is set on the outside of magnet；The matching tuning circuit is arranged in one end of magnet and is connected with radio-frequency coil, for radio frequency line
Circle carries out matching tuning.
Optionally, the static magnetic field is mutually orthogonal with RF magnetic field.
Optionally, first magnet is identical as the diameter of third magnet, and the diameter of second magnet is less than the first magnetic
The diameter of body.
Optionally, first magnet is identical as the height of third magnet, and the height of second magnet is more than the first magnetic
The height of body.
Optionally, the radio frequency line is coaxial with magnet and geometric center overlaps.
Optionally, further include gauze screen, the gauze screen is wrapped on the outside of magnet, setting magnet and radio-frequency coil it
Between.
Optionally, the gauze screen is worked out by enameled wire.
Optionally, further include magnet vessel, the magnet vessel is wrapped on the outside of gauze screen, is arranged in gauze screen and radio frequency
Between coil.
Optionally, the magnet vessel is made of plastics.
Optionally, the radio-frequency coil is arranged on the outside of the second magnet.
The beneficial effects of the present invention are：
The static magnetic field that the RF magnetic field that radio-frequency coil in the present invention generates is generated with magnet magnetic field in target area
The angle in direction is 90 ° or close to 90 °, can be by the distance between solenoid the number of turns, two solenoids, solenoid turn-to-turn
Away from adjusting adjust RF magnetic field, can adjust static magnetic field by the adjusting of radius, height to three permanent magnets, and
Gauze screen is wrapped up on the outside of magnet to shield alternating magnetic field, while reducing itself eddy current effect and RF magnetic field and radio-frequency coil are handed over
The influence of leakage resistance, effectively reduces the AC resistance of radio-frequency coil, and overall structure may be implemented to generate in target area uniform
The purpose of design for spending higher static magnetic field and RF magnetic field effectively improves the signal-to-noise ratio of cylindrical core magnetic resonance probe.
Other advantages, target and the feature of the present invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.The target and other advantages of the present invention can by following specification realizing and
It obtains.
Description of the drawings
To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is made below in conjunction with attached drawing excellent
The detailed description of choosing, wherein：
Fig. 1 is a kind of overall structure diagram of cylindrical core magnetic resonance probe involved in the present invention；
Fig. 2 is the structural schematic diagram of the magnet involved in the present invention；
Fig. 3 is the structural schematic diagram of the radio-frequency coil involved in the present invention；
Fig. 4 is the Distribution of Magnetic Field and target area schematic diagram of a kind of cylindrical core magnetic resonance probe involved in the present invention；
Fig. 5 is the position view of the matching tuning circuit involved in the present invention；
Fig. 6 is the structural schematic diagram of the enameled wire mesh grid involved in the present invention；
Fig. 7 is the magnet size figure in the embodiment of the present invention；
Fig. 8 is the simulation result of target area static magnetic field；
Fig. 9 is the simulation result of target area RF magnetic field；
Figure 10 is the polar plot that target area is superimposed magnetic field.
Specific implementation mode
Illustrate that embodiments of the present invention, those skilled in the art can be by this specification below by way of specific specific example
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.It should be noted that the diagram provided in following embodiment is only to show
Meaning mode illustrates the basic conception of the present invention, and in the absence of conflict, the feature in following embodiment and embodiment can phase
Mutually combination.
Wherein, the drawings are for illustrative purposes only and are merely schematic diagrams rather than pictorial diagram, should not be understood as to this
The limitation of invention；Embodiment in order to better illustrate the present invention, the certain components of attached drawing have omission, zoom in or out, not
Represent the size of actual product；It will be understood by those skilled in the art that certain known features and its explanation may be omitted and be in attached drawing
It is appreciated that.
The same or similar label correspond to the same or similar components in the attached drawing of the embodiment of the present invention；In retouching for the present invention
In stating, it is to be understood that if there is the orientation or positional relationship of the instructions such as term "upper", "lower", "left", "right", "front", "rear"
To be based on the orientation or positional relationship shown in the drawings, be merely for convenience of description of the present invention and simplification of the description, rather than indicate or
Imply that signified device or element must have a particular orientation, with specific azimuth configuration and operation, therefore described in attached drawing
The term of position relationship only for illustration, is not considered as limiting the invention, for the ordinary skill of this field
For personnel, the concrete meaning of above-mentioned term can be understood as the case may be.
- Figure 10 is please referred to Fig.1, the element numbers in attached drawing indicate respectively：Magnet 1, the first magnet 11, the second magnet 12,
Third magnet 13, radio-frequency coil 2, solenoid 21, gauze screen 3, magnet vessel 4, matching tuning circuit 5, electric current I, static magnetic field
B0, RF magnetic field B1, target area T.
The present invention relates to a kind of cylindrical core magnetic resonance probe, including magnet, radio-frequency coil 2 and matching tuning circuit 5,
The magnet is for generating static magnetic field B0, coaxially stacked by three cylindrical permanent magnets, in the axial direction from magnet
One end to its offside be followed successively by the first magnet 11, the second magnet 12 and third magnet 13, adjacent two permanent magnets are connected；Institute
State radio-frequency coil 2 for generate and static magnetic field B0Magnetic direction intersection RF magnetic field B1, the radio-frequency coil 2 is by two
The opposite solenoid 21 of rotation direction is composed in series, and is set on the outside of magnet；The matching tuning circuit 5 be arranged in one end of magnet and
It is connected with radio-frequency coil 2, for carrying out matching tuning to radio-frequency coil 2.
Preferably, the static magnetic field B0With RF magnetic field B1It is mutually orthogonal；First magnet 11 is straight with third magnet 13
Diameter is identical, and the diameter of second magnet 12 is less than the diameter of the first magnet 11；First magnet 11 and third magnet 13
Highly identical, the height of second magnet 12 is more than the height of the first magnet 11；The radio frequency line is coaxial with magnet and geometry
Center overlaps；Further include gauze screen 3, the gauze screen 3 is wrapped on the outside of magnet, setting magnet and radio-frequency coil 2 it
Between；The gauze screen 3 is worked out by enameled wire；Further include magnet vessel 4, the magnet vessel 4 is wrapped in outside gauze screen 3
Side is arranged between gauze screen 3 and radio-frequency coil 2；The magnet vessel 4 is made of plastics；The setting of the radio-frequency coil 2 is the
Two magnets, 12 outside.
In the present invention a kind of involved cylindrical core magnetic resonance probe overall structure as shown in Figure 1, overall structure by
It is interior to outer to be followed successively by magnet 1, gauze screen 3, magnet vessel 4 and radio-frequency coil 2.1 structure of magnet is as shown in Fig. 2, by the first magnetic
Body 11, the second magnet 12, third magnet 13 sequentially coaxially stack, and axial static magnetic field B is generated around magnet 10, three
The direction of magnetization of block permanent magnet is consistent, therefore three pieces of permanent magnets can realize effectively connection in stacking process by attracting each other
It is fixed, it is stacked with third magnet 13 using the first magnet 11 of identical size in the present embodiment, the first magnet 11, the second magnetic
Body 12, the radius of third magnet 13, highly according to the position of target area T, size, shape determine.Three to attract each other are forever
Magnet generates static magnetic field B in target area T0.The structure of radio-frequency coil 2 is as shown in figure 3, by the opposite spiral shell of two polarity of the magnetic fields
Spool 21 is composed in series, and in target area, T generates RF magnetic field B radially1。
The performance of nuclear magnetic resonance is by static magnetic field B0The uniformity, RF magnetic field B1The uniformity, RF magnetic field B1With static-magnetic
Field B0The influence of angle, the RF magnetic field B1With static magnetic field B0The optimal value of angle is 90 °, i.e. RF magnetic field B1With static state
Magnetic field B0It is mutually orthogonal.Radius, the height optimization target area T that 1 structure of magnet can be by adjusting three permanent magnets in the present invention
Interior static magnetic field B0；By adjusting the number of turns of two solenoids 21, turn-to-turn away from and two solenoids 21 between spacing come
Adjust RF magnetic field B1The uniformity and magnetic field angle.Fig. 4 gives invention static magnetic field B in the T of target area0And radio-frequency magnetic
Field B1Polar plot, and identify the directions electric current I in radio-frequency coil 2.
The RF magnetic field B that radio-frequency coil 2 generates around magnet 11Magnet can be made to generate demagnetization phenomenon, to prevent this kind of feelings
Condition, the present invention have wrapped up one layer of gauze screen 3 on 1 surface of magnet, which is worked out by enameled wire, overall structure such as Fig. 6
It is shown.Gauze screen 3 is in shielded radio frequency magnetic field B1While, it can effectively reduce the eddy current effect of 3 own material of gauze screen.This can
Reduce eddy current effect to RF magnetic field B1The influence of intensity and distribution, and the AC resistance of radio-frequency coil 2 can be effectively reduced, it can
Effectively improve a kind of signal-to-noise ratio of cylindrical core magnetic resonance probe involved in the present invention.
After 2 structure determination of 1 structure of magnet and radio-frequency coil, the magnet 1 wrapped with gauze screen 3 is put into made of plastics
In magnet vessel 4, and radio-frequency coil 2 is wound in 4 outside of magnet vessel, measures the lumped parameter of radio-frequency coil 2：Resistance R, electricity
Feel L, radio-frequency coil 2 is tuned and is matched, the position for matching tuning circuit 5 is as shown in Figure 5.
According to nuclear magnetic resonance principle, when carrying out magnetic resonance detection, sample to be tested is in static magnetic field B0In, using with it is quiet
State magnetic field B0Orthogonal RF magnetic field B1To being in static magnetic field B0In sample into row energization, then connect further through radio-frequency coil 2
Receive the NMR signal of sample.In order to obtain the NMR signal of high s/n ratio, nmr probe is setting clocking requirement
Target area T uniformity of magnetic field is high, RF magnetic field B1The uniformity is high, static magnetic field B0With RF magnetic field B1Angle is 90 degree or connects
Nearly 90 °.
1 size of magnet in the particular embodiment is as shown in fig. 7, H1=25mm, H2=50mm, R1=40mm, R2=
35mm；Single solenoid 21 is 4~8 circles, and turn-to-turn is away from for 5mm~10mm；Spacing between two concatenated solenoids 21 is
15~35mm.Using analog result such as Fig. 8~Figure 10 institutes of the magnetic field of the goal of the cylindrical core magnetic resonance probe of the size design
Show.It should be noted that the position of target area T spatially annular spread, each section of the annular region around probe
Magnetic field all same or very much like, which is a section of target area T, it is sufficient to be illustrated in the T of target area
Distribution of Magnetic Field.
The RF magnetic field B that radio-frequency coil 2 in the present invention generates1The static magnetic field B generated with magnet 10In target area T
The angle of interior magnetic direction is 90 ° or close to 90 °, can by the distance between 21 the number of turns of solenoid, two solenoids 21,
Solenoid 21 turn-to-turn away from adjusting adjust RF magnetic field B1, can by the adjusting of radius, height to three permanent magnets come
Adjust static magnetic field B0, and in 1 outside package gauze screen 3 of magnet to shield alternating magnetic field, while reducing itself eddy current effect pair
RF magnetic field B1With the influence of 2 AC resistance of radio-frequency coil, the AC resistance of radio-frequency coil 2 is effectively reduced, overall structure can be with
It realizes and generates the higher static magnetic field B of the uniformity in the T of target area0With RF magnetic field B1Purpose of design, effectively improve cylinder
The signal-to-noise ratio of forming core magnetic resonance probe.
Finally illustrate, the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although with reference to compared with
Good embodiment describes the invention in detail, it will be understood by those of ordinary skill in the art that, it can be to the skill of the present invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of the technical program, should all be covered in the present invention
Right in.
Claims (10)
1. a kind of cylindrical core magnetic resonance probe, which is characterized in that including magnet, radio-frequency coil and matching tuning circuit, institute
Magnet is stated for generating static magnetic field, is coaxially stacked by three cylindrical permanent magnets, in the axial direction from the one of magnet
End to its offside is followed successively by the first magnet, the second magnet and third magnet, and adjacent two permanent magnets are connected；The radio-frequency coil
For generating the RF magnetic field intersected with the magnetic direction of static magnetic field, the radio-frequency coil is by the opposite solenoid of two rotation directions
It is composed in series, is set on the outside of magnet；The matching tuning circuit is arranged in one end of magnet and is connected with radio-frequency coil, is used for
Matching tuning is carried out to radio-frequency coil.
2. cylindrical core magnetic resonance probe as described in claim 1, which is characterized in that the static magnetic field and RF magnetic field
It is mutually orthogonal.
3. cylindrical core magnetic resonance probe as described in claim 1, which is characterized in that first magnet and third magnet
Diameter it is identical, the diameter of second magnet is less than the diameter of the first magnet.
4. cylindrical core magnetic resonance probe as described in claim 1, which is characterized in that first magnet and third magnet
Height it is identical, the height of second magnet is more than the height of the first magnet.
5. cylindrical core magnetic resonance probe as described in claim 1, which is characterized in that the radio frequency line it is coaxial with magnet and
Geometric center overlaps.
6. cylindrical core magnetic resonance probe as described in claim 1, which is characterized in that further include gauze screen, the shielding
Net is wrapped on the outside of magnet, is arranged between magnet and radio-frequency coil.
7. cylindrical core magnetic resonance probe as described in claim 6, which is characterized in that the gauze screen is worked out by enameled wire
It forms.
8. cylindrical core magnetic resonance probe as described in claim 6, which is characterized in that further include magnet vessel, the magnetic
Body container pack is arranged on the outside of gauze screen between gauze screen and radio-frequency coil.
9. cylindrical core magnetic resonance probe as described in claim 8, which is characterized in that the magnet vessel is by plastics system
At.
10. cylindrical core magnetic resonance probe as described in claim 1, which is characterized in that radio-frequency coil setting is the
On the outside of two magnets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810602646.5A CN108776317A (en) | 2018-06-12 | 2018-06-12 | A kind of cylindrical core magnetic resonance probe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810602646.5A CN108776317A (en) | 2018-06-12 | 2018-06-12 | A kind of cylindrical core magnetic resonance probe |
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| Publication Number | Publication Date |
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| CN108776317A true CN108776317A (en) | 2018-11-09 |
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| CN201810602646.5A Pending CN108776317A (en) | 2018-06-12 | 2018-06-12 | A kind of cylindrical core magnetic resonance probe |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579502A (en) * | 2019-09-29 | 2019-12-17 | 西安石油大学 | Sensor for nuclear magnetic resonance two-phase flow measurement |
| CN110618160A (en) * | 2019-11-05 | 2019-12-27 | 重庆航天职业技术学院 | Magnetic resonance sensor for aging detection of cable insulation layer material |
| CN112671117A (en) * | 2020-11-23 | 2021-04-16 | 中国科学技术大学 | Source-term electromagnetic energy flow generating device with circumferential poynting vector characteristics |
| CN113009389A (en) * | 2019-12-19 | 2021-06-22 | 中国科学院宁波材料技术与工程研究所 | Laser heating high-temperature nuclear magnetic resonance probe and device |
| CN113432645A (en) * | 2021-06-25 | 2021-09-24 | 中国矿业大学 | Dam and slope stability monitoring and early warning method based on NMR and Beidou remote sensing combined measurement |
| CN117783017A (en) * | 2024-02-26 | 2024-03-29 | 中国科学院武汉岩土力学研究所 | Rock and soil detection device and method combining nuclear magnetic resonance and hyperspectral imaging |
| CN117783017B (en) * | 2024-02-26 | 2024-06-21 | 中国科学院武汉岩土力学研究所 | Rock and soil detection device and method combining nuclear magnetic resonance and hyperspectral imaging |
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| CN201492418U (en) * | 2009-09-14 | 2010-06-02 | 东南大学 | Probe for magnetic resonance imaging system |
| CN205484139U (en) * | 2016-01-08 | 2016-08-17 | 重庆师范大学 | A cylindrical nuclear magnetic resonance sensor for detecting moisture in soil |
| CN106707208A (en) * | 2016-12-15 | 2017-05-24 | 重庆大学 | Low-field unilateral nuclear magnetic resonance equipment for superficial skin imaging |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201492418U (en) * | 2009-09-14 | 2010-06-02 | 东南大学 | Probe for magnetic resonance imaging system |
| CN205484139U (en) * | 2016-01-08 | 2016-08-17 | 重庆师范大学 | A cylindrical nuclear magnetic resonance sensor for detecting moisture in soil |
| CN106707208A (en) * | 2016-12-15 | 2017-05-24 | 重庆大学 | Low-field unilateral nuclear magnetic resonance equipment for superficial skin imaging |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579502A (en) * | 2019-09-29 | 2019-12-17 | 西安石油大学 | Sensor for nuclear magnetic resonance two-phase flow measurement |
| CN110579502B (en) * | 2019-09-29 | 2023-03-28 | 西安石油大学 | Sensor for nuclear magnetic resonance two-phase flow measurement |
| CN110618160A (en) * | 2019-11-05 | 2019-12-27 | 重庆航天职业技术学院 | Magnetic resonance sensor for aging detection of cable insulation layer material |
| CN110618160B (en) * | 2019-11-05 | 2023-01-10 | 重庆航天职业技术学院 | Magnetic resonance sensor for aging detection of cable insulation layer material |
| CN113009389A (en) * | 2019-12-19 | 2021-06-22 | 中国科学院宁波材料技术与工程研究所 | Laser heating high-temperature nuclear magnetic resonance probe and device |
| CN113009389B (en) * | 2019-12-19 | 2022-09-23 | 中国科学院宁波材料技术与工程研究所 | Laser heating high-temperature nuclear magnetic resonance probe and device |
| CN112671117A (en) * | 2020-11-23 | 2021-04-16 | 中国科学技术大学 | Source-term electromagnetic energy flow generating device with circumferential poynting vector characteristics |
| CN113432645A (en) * | 2021-06-25 | 2021-09-24 | 中国矿业大学 | Dam and slope stability monitoring and early warning method based on NMR and Beidou remote sensing combined measurement |
| CN117783017A (en) * | 2024-02-26 | 2024-03-29 | 中国科学院武汉岩土力学研究所 | Rock and soil detection device and method combining nuclear magnetic resonance and hyperspectral imaging |
| CN117783017B (en) * | 2024-02-26 | 2024-06-21 | 中国科学院武汉岩土力学研究所 | Rock and soil detection device and method combining nuclear magnetic resonance and hyperspectral imaging |
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