CN104215921A - Fixed-gradient NMR (nuclear magnetic resonance) magnet - Google Patents
Fixed-gradient NMR (nuclear magnetic resonance) magnet Download PDFInfo
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- CN104215921A CN104215921A CN201310208478.9A CN201310208478A CN104215921A CN 104215921 A CN104215921 A CN 104215921A CN 201310208478 A CN201310208478 A CN 201310208478A CN 104215921 A CN104215921 A CN 104215921A
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Abstract
The invention relates to a fixed-gradient NMR (nuclear magnetic resonance) magnet and provides an NMR magnet system applied to non-uniform field NMR techniques. The system is capable of generating a fixed-gradient magnetic field in a measurement area; the fixed-gradient magnetic field is available for NMR two-dimensional imaging of liquid and solid samples. The system comprises four yokes made of pure iron, four pieces of rare-earth magnetic material, and two all-iron gradient plates. The four pieces of rare-earth magnetic material are placed in the yokes, every two of polarization directions of the four pieces of rare-earth magnetic material form two magnetic circuits; a more uniform measurement magnetic field is generated in the center of the system. The gradient plates are placed right over and under the measurement area; a uniformly decreasing one-dimensional gradient is generated in the measurement area.
Description
Technical field
The magnet system modular construction of the magnetic nuclear resonance analyzer that the present invention relates to.
Background technology
Magnetic nuclear resonance analyzer can make sample generation nmr phenomena, analyzes the material composition of sample, inner structure and character by obtaining the NMR signal of sample.
Nuclear magnetic resonance analyser is mainly divided into three parts: magnet system, spectrometer system and computing machine part.Magnet system is very important core, and it is made up of main magnet, gradient coil and radio-frequency coil.Magnet system provides polarizing magnetic field, spatial encoding gradient magnetic field and produces the radio frequency necklace of radio-frequency field.Spectrometer part controls radio frequency sending set and receiver, produces and performs pulse train, accepting NMR signal simultaneously, completing image acquisition and transmission.Computer department sub-control notation instrument, produces sequence signal, gradient waveform model, and the operation of controls scanner.After receiving the NMR signal returned, computing machine part will process signal, completes image reconstruction, and exports and display image.
By the nuclear magnetic resonance echo of sample, the character such as the relaxation of sample, diffusion can be obtained.The information such as material composition, fluid type, fluid properties, pore media, factor of porosity and pore-size can be obtained in sample by resolving the relaxation of sample and scattering nature.
The magnet of existing magnetic nuclear resonance analyzer can produce uniform magnetic field.The relaxation properties of the nuclear magnetic resonance of sample can be recorded under uniform magnetic field.But the scattering nature of sample can only be measured under gradient fields.Some magnetic nuclear resonance analyzers use gradient coil to produce gradient fields, and then measure the scattering nature of sample.But gradient coil has generation eddy current, stablizes, increases the unfavorable factors such as the complexity of instrument not.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of magnetic nuclear resonance analyzer magnet with fixing gradient, Two-dimensional NMR Map measuring technique can be implemented, obtain relaxation and the scattering nature of sample simultaneously, and there is structure simply, do not produce the advantage such as eddy current, stable magnetic field.
Tradition NMR magnet cannot install gradient plate additional thus produce the fixing gradient on a direction.The present invention proposes a kind of design being different from traditional NMR magnet structure.Be convenient to install additional and dismantle gradient plate in design of the present invention, thus uniform magnetic field can be produced neatly and there is the non-uniform magnetic field of fixing gradient in one direction.
The present invention includes four pieces of yokes, four blocks of magnetic materials and two block gradient plates.Four blocks of magnetic materials are embedded among four pieces of yokes.The direction of magnetization of every two blocks of adjacent magnetic materials is contrary, together form two magnetic loops with four pieces of yokes.When not adding two block gradient plates, center measured zone produces uniform magnetic field, can be used for implementing uniform field Nuclear Magnetic Resonance Measurement technology.Two block gradient plates are close to upper and lower two pieces of yokes to place towards the side of measured zone, at this moment measured zone produces the gradient of successively decreasing in one direction.The Nuclear Magnetic Resonance Measurement technology of non homogen field can be implemented in magnetic field with gradient.
Gradient plate is made up of electrical pure iron, and length is consistent with the length of upper lower yoke.The width of gradient plate is slightly wider than center measured zone.The variable thickness of gradient plate both sides causes, and slightly thick side produces stronger magnetic field in measured zone, and thinner side produces more weak magnetic field in measured zone.Thus, successively decrease from side to opposite side in the magnetic field of measured zone, forms the gradient on a direction.
Accompanying drawing explanation
Fig. 1 is that small cores magnetic resonance device magnet of the present invention sets up three-dimensional structure.
Fig. 2 is the schematic three dimensional views that magnet of the present invention sets up gradient plate.
Embodiment
A kind of nuclear magnetic resonance spectroscopy equipment of enforcement design of the present invention.It can in conjunction with comprising the clamper of fixed sample, spectrometer part and computing machine.Be different from the uniform magnetic field of many NMR magnet design.This magnet design both can produce uniform magnetic field, after can installing again upper and lower two block gradient plates again additional, produced the non-uniform magnetic field with known gradient in one direction.Use this gradient plate can obtain magnet assembly design that is flexible and low cost.
Magnet system of the present invention need in conjunction with radio-frequency coil, after control circuit and computer console form the nuclear magnetic resonance analyser of complete set, sample to be measured is positioned over center measured zone, controls radio-frequency coil launch pulse sequence by control circuit, then accept the nmr echo signal of sample.Echoed signal is processed, obtains required nuclear magnetic resonance measured data.
Claims (6)
1. be applied to the NMR magnet that Two-dimensional NMR Map is measured, its feature comprises: permanent-magnet materials is embedded in the magnet structure of yoke and magnet with fixed ladder degree plate to produce one dimension gradient in measured zone.
2., for nuclear magnetic resonance analyser magnet according to claim 1, it is characterized in that four blocks of magnetic materials also with use embed among four pieces of yokes.Among four blocks of magnetic materials, the direction of magnetization of every two blocks of adjacent magnetic materials is contrary.
3. for NMR magnet assembly according to claim 2, it is characterized in that also having: when not installing gradient plate additional, magnetic material and yoke produce the good magnetic field of uniformity coefficient in the central area of magnet system, can be used for uniform field Nuclear Magnetic Resonance Measurement technology.
4. for the NMR magnet assembly described in claim 1, its feature also comprises: upper and lower two block gradient plates are made up of pure iron, and geometry is identical, and is dismountable.
5. for the gradient plate described in claim 4, its feature also comprises: two block gradient plate length are identical with the length of upper lower yoke, are positioned over directly over measured zone, do not need stationary installation, can directly be adsorbed on upper and lower two pieces of yokes.
6. for the gradient plate described in claim 4, its feature also comprises: the xsect of gradient plate is trapezoidal, thicker one end can make measured zone produce stronger magnetic field, thinner one end produces more weak magnetic field in measured zone, thus the magnetic induction density of measured zone is from one end to the other side successively decreased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310208478.9A CN104215921A (en) | 2013-05-30 | 2013-05-30 | Fixed-gradient NMR (nuclear magnetic resonance) magnet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310208478.9A CN104215921A (en) | 2013-05-30 | 2013-05-30 | Fixed-gradient NMR (nuclear magnetic resonance) magnet |
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| CN104215921A true CN104215921A (en) | 2014-12-17 |
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| CN201310208478.9A Pending CN104215921A (en) | 2013-05-30 | 2013-05-30 | Fixed-gradient NMR (nuclear magnetic resonance) magnet |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105761874A (en) * | 2016-04-22 | 2016-07-13 | 北京理工大学 | Uniform magnetic field device for measuring speed of explosive detonation product particles |
| CN109856572A (en) * | 2019-04-24 | 2019-06-07 | 河北工业大学 | A kind of one-dimensional and two-dimentional low-and high-frequency magnetic characteristic measuring system |
| CN111627642A (en) * | 2020-05-27 | 2020-09-04 | 中国科学院电工研究所 | Magnetic resonance imaging magnet with multi-magnetic pole structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2493161Y (en) * | 2001-08-29 | 2002-05-29 | 中国科学院武汉物理与数学研究所 | Permanent magnet for nuclear magnetic resonacne (NMR) imaging instrument |
| CN101345115A (en) * | 2008-05-16 | 2009-01-14 | 哈尔滨工业大学 | Open type permanent magnet module used for magnetic resonance wave spectrum analyzer |
| CN102024546A (en) * | 2009-09-09 | 2011-04-20 | 中国石油天然气股份有限公司 | Gradient permanent magnet for constant gradient field rock sample analyzer |
| CN102998322A (en) * | 2011-09-14 | 2013-03-27 | 中国石油天然气股份有限公司 | Constant gradient field nuclear magnetic resonance rock sample analysis method and instrument |
-
2013
- 2013-05-30 CN CN201310208478.9A patent/CN104215921A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2493161Y (en) * | 2001-08-29 | 2002-05-29 | 中国科学院武汉物理与数学研究所 | Permanent magnet for nuclear magnetic resonacne (NMR) imaging instrument |
| CN101345115A (en) * | 2008-05-16 | 2009-01-14 | 哈尔滨工业大学 | Open type permanent magnet module used for magnetic resonance wave spectrum analyzer |
| CN102024546A (en) * | 2009-09-09 | 2011-04-20 | 中国石油天然气股份有限公司 | Gradient permanent magnet for constant gradient field rock sample analyzer |
| CN102998322A (en) * | 2011-09-14 | 2013-03-27 | 中国石油天然气股份有限公司 | Constant gradient field nuclear magnetic resonance rock sample analysis method and instrument |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105761874A (en) * | 2016-04-22 | 2016-07-13 | 北京理工大学 | Uniform magnetic field device for measuring speed of explosive detonation product particles |
| CN109856572A (en) * | 2019-04-24 | 2019-06-07 | 河北工业大学 | A kind of one-dimensional and two-dimentional low-and high-frequency magnetic characteristic measuring system |
| CN109856572B (en) * | 2019-04-24 | 2023-09-22 | 河北工业大学 | One-dimensional and two-dimensional high-low frequency magnetic characteristic measurement system |
| CN111627642A (en) * | 2020-05-27 | 2020-09-04 | 中国科学院电工研究所 | Magnetic resonance imaging magnet with multi-magnetic pole structure |
| CN111627642B (en) * | 2020-05-27 | 2021-04-20 | 中国科学院电工研究所 | Magnetic resonance imaging magnet with multi-magnetic pole structure |
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Application publication date: 20141217 |