CN109884108A - On-line NMR detection device, system and method - Google Patents
On-line NMR detection device, system and method Download PDFInfo
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- CN109884108A CN109884108A CN201910162482.3A CN201910162482A CN109884108A CN 109884108 A CN109884108 A CN 109884108A CN 201910162482 A CN201910162482 A CN 201910162482A CN 109884108 A CN109884108 A CN 109884108A
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Abstract
The present invention provides a kind of on-line NMR detection device, system and method, is related to nuclear magnetic resonance technique.Wherein the on-line NMR detection device includes: main magnet, for generating magnetostatic field in detection zone, is polarized with the hydrogen atom to the hydrogeneous sample in detection zone；Focusing magnet is arranged in magnetostatic field, to enhance magnetostatic field and keep magnetostatic field more uniform；Radio-frequency antenna, for generating RF magnetic field in detection zone, to excite the hydrogen atom after being polarized to generate nuclear magnetic resonance；Radio-frequency antenna is also used to receive the echo-signal of nuclear magnetic resonance.On-line NMR detection device provided by the invention, can be realized the lossless, efficient of hydrogeneous sample, real-time detection.
Description
Technical field
The present invention relates to nuclear magnetic resonance techniques, and in particular to a kind of on-line NMR detection device, system and method.
Background technique
Hydrogenous material is that a substance, such as alkane, alkene, alkynes, cyclic hydrocarbon and aromatic hydrocarbon containing hydrogen atom etc. are hydrocarbon
Compound (or being " hydrocarbon compound "), fat compound, water and crude oil etc..
Currently, the detection for hydrogenous material, majority uses chemical method, but often causes to the structure of hydrogeneous sample
It destroys, not can guarantee the integrality of hydrogeneous sample.For example fat in food is measured frequently with soxhlet extraction methods, it need to adopt
Sample to be detected is extracted with anhydrous ether or petroleum ether equal solvent, then solvent is evaporated to or obtained crude fat.The crude fat
In not only containing fat, also containing pigment, there are the substances such as volatile oil, wax, resin.Therefore for fat compound
Measurement, not only needs to destroy food, but also the process detected is complex, needs the long period, be unable to satisfy it is quick, efficient,
Online real-time demand.In addition, chemical method is also easy to cause testing result inaccurate.
Magnetic resonance detection technology is the technology using nuclear magnetic resonance principle detection hydrogen atom.Pass through hydrogen in detection measured object
The content and occurrence status of atom can accurately obtain the information of various composition in measured object.Therefore, expect that developing one kind is based on
The lossless detection method of nuclear magnetic resonance technique, and meet quickly, efficiently, detect demand in real time.
Summary of the invention
In view of the above-mentioned drawbacks in the prior art, the present invention provides a kind of on-line NMR detection device, can be realized
The lossless, efficient of hydrogeneous sample, real-time detection.
The present invention provides a kind of on-line NMR detection system, including above-mentioned on-line NMR detection device, can
It is lossless, efficiently and in real time detect hydrogeneous sample.
The present invention also provides a kind of on-line NMR detection method, using aforementioned on-line NMR detection device into
Row.
To achieve the above object, the present invention provides a kind of on-line NMR detection device, comprising:
Main magnet, it is former with the hydrogen to the hydrogeneous sample in detection zone for generating magnetostatic field in detection zone
Son polarizes；
Focusing magnet is arranged in magnetostatic field, to enhance magnetostatic field and keep magnetostatic field more uniform；
Radio-frequency antenna, for generating RF magnetic field in detection zone, to excite the hydrogen atom after being polarized to generate nuclear-magnetism
Resonance；The radio-frequency antenna is also used to receive the echo-signal of nuclear magnetic resonance.
Further, main magnet includes pedestal and the first main magnet being vertically disposed on pedestal and the second main magnetic
Body, in which: the S of the first main magnet is extremely arranged far from pedestal, the pole N towards pedestal；The N of second main magnet is extremely far from pedestal, the pole S court
It is arranged to pedestal.It is, the pole S of the first main magnet is the pole S of main magnet, the pole N of the second main magnet is the N of main magnet
Pole.
Further, focusing magnet is arranged between the first main magnet and the second main magnet, and focusing magnet includes first poly-
Burnt magnet and the second focusing magnet, in which: the first focusing magnet is close to the first main magnet, and the S of the first focusing magnet is extremely separate
Pedestal, N is extremely close to pedestal；Second focusing magnet is close to the second main magnet, and the N of the second focusing magnet, extremely far from pedestal, S is leaned on pole
Nearly pedestal.
Further, the angle between the first focusing magnet and the first main magnet is 0~15 °, the second focusing magnet and
Angle between two main magnets is 0~15 °.
Further, radio-frequency antenna includes two antennas, and each antenna includes U-shaped coil and square coil, and rectangular lines
Circle is surrounded by the U-shaped coil；Two antennas are symmetrical set, and keep the opening of two U-shaped coils opposite.
Further, the field strength of RF magnetic field is greater than the field strength of magnetostatic field.
Further, aforementioned on-line NMR detection device further includes shimming magnet, and the setting of shimming magnet is main first
Between magnet and the second main magnet, and the pole S the first main magnet of direction of shimming magnet, the pole N the second main magnetic of direction of shimming magnet
Body.
The present invention provides a kind of on-line NMR detection system, including magnetic screen shell, sample feeding mechanism and above-mentioned
On-line NMR detection device, in which: on-line NMR detection device is contained in magnetic screen shell；Sample feeding mechanism includes
Conveyer belt and driving mechanism, driving mechanism is for driving conveyer belt to transmit hydrogeneous sample, so that the hydrogeneous sample can be by inspection
Survey region.
Further, the transmission speed of conveyer belt is 0~0.4m/s.
The present invention also provides a kind of on-line NMR detection method, using on-line NMR detection device above-mentioned into
Row, comprising: hydrogeneous sample is placed in detection zone, main magnet and focusing magnet is made to carry out pole to the hydrogen atom of hydrogeneous sample
Change, the hydrogen atom after being polarized radio-frequency antenna excitation simultaneously generates nuclear magnetic resonance, and receives nuclear magnetic resonance using radio-frequency antenna
Echo-signal.
On-line NMR detection device provided by the invention is generated using nuclear magnetic resonance technique by using main magnet
Magnetostatic field is polarized with the hydrogen atom to hydrogeneous sample, is enhanced magnetostatic field by focusing magnet and is kept magnetostatic field more uniform,
Time that RF magnetic field excites the hydrogen atom after being polarized to generate nuclear magnetic resonance and receives nuclear magnetic resonance is generated by radio-frequency antenna
Wave signal, so as to be detected to hydrogeneous sample.With the existing phase in such a way that the means such as chemical method measure hydrogenous material
Than using on-line NMR detection device provided by the invention, hydrogeneous sample, which is placed in detection zone, to be detected
And testing result is obtained, the convenience of detection is not only increased, detection time is shortened, simplifies detecting step, improves inspection
Survey efficiency；And due to that will not be caused brokenly to hydrogeneous sample without chemically or physically being handled hydrogeneous sample in advance
It is bad, realize non-destructive testing.
On-line NMR detection system provided by the invention, including above-mentioned on-line NMR detection device, same energy
Enough realize that hydrogeneous sample is accurate, convenient, real-time, non-destructive testing.
On-line NMR detection method provided by the invention, using above-mentioned on-line NMR detection device to hydrogeneous sample
Product are detected, same, high speed, lossless advantage accurate, convenient with detection.
Detailed description of the invention
Described in detail below, the above and other objects, features and advantages general of the embodiment of the present invention by referring to accompanying drawing
It becomes more clearly understood from.In the accompanying drawings, by by example and it is unrestricted in a manner of multiple embodiments of the invention are said
It is bright, in which:
Fig. 1 is the structural schematic diagram of on-line NMR detection device provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of radio-frequency antenna in on-line NMR detection device provided in an embodiment of the present invention；
Fig. 3 is the main view of on-line NMR detection system provided in an embodiment of the present invention；
Fig. 4 is the side view of on-line NMR detection system provided in an embodiment of the present invention；
Fig. 5 is the top view of on-line NMR detection system provided in an embodiment of the present invention.
Description of symbols:
100- line core magnetic resonance detection device；110- main magnet；
111- pedestal；The first main magnet of 112-；
The second main magnet of 113-；120- detection zone；
130- focusing magnet；The first focusing magnet of 131-；
The second focusing magnet of 132-；140- radio-frequency antenna；
141-U shape coil；142- square coil；
150- shimming magnet；200- magnetic screen shell；
210- sample inlet；220- sample export；
310- conveyer belt；320- driving mechanism；
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Embodiment one
As shown in Figure 1, the present embodiment provides a kind of on-line NMR detection devices 100, comprising:
Main magnet 110, for generating magnetostatic field B in detection zone 120 (or being sensitizing range)0, in inspection
The hydrogen atom for the hydrogeneous sample surveyed in region 120 polarizes；
Focusing magnet 130 is arranged in magnetostatic field B0It is interior, to enhance magnetostatic field B0And make magnetostatic field B0It is more uniform；
Radio-frequency antenna 140, for generating RF magnetic field B in detection zone 1201, to excite the hydrogen atom after being polarized
Generate nuclear magnetic resonance；Radio-frequency antenna 140 is also used to receive the echo-signal of nuclear magnetic resonance.
So-called " hydrogeneous sample " refers to the sample comprising protium, for example is rich in the compound sample of hydrogen atom.It is common
The compound fat compound rich in hydrogen atom, hydrocarbon compound, flowing materials, the water such as crude oil etc..The present embodiment
It is not specially limited herein.
Uniform magnetostatic field B0It is one of the necessary condition for making hydrogeneous sample that nuclear magnetic resonance occur, according to Larmor formula,
The magnetic field strength of main magnet 110 determines the resonant frequency of NMR system, and uniformity of magnetic field directly affects nuclear magnetic resonance
The quality of signal should have small in size, magnetic field so main magnet 110 is the important composition of on-line NMR detection device 100
The features such as uniformity is high, therefore main magnet 110 is manufactured preferably with the good high quality magnetic material of temperature stability.
In the present embodiment, main magnet 110 used specifically can be U-shaped, in favor of generating more in detection zone 120
Uniform magnetostatic field B0, to polarize to the hydrogeneous sample in detection zone 120, the hydrogen atom in hydrogeneous sample is made to exist
Magnetostatic field B0Under the action of turn to same direction, and the direction and magnetostatic field B0Direction it is completely the same or almost the same.
Please further refer to Fig. 1, main magnet 110 include pedestal 111 and be vertically disposed on pedestal 111 first
Main magnet 112 and the second main magnet 113, in which:
The S of first main magnet 112 is extremely arranged far from pedestal 111, the pole N towards pedestal 111；
The N of second main magnet 113 is extremely arranged far from pedestal 111, the pole S towards pedestal 111.
The above-mentioned main magnet 110 collectively formed by pedestal 111, the first main magnet 112 and the second main magnet 113 is substantially in U
Type, and S pole of the pole S of the first main magnet 112 as main magnet 110, N of the pole N of the second main magnet 113 as main magnet 110
Pole.The main magnet 110 can generate more uniform magnetostatic field B in detection zone 1200, make the hydrogen atom in hydrogeneous sample
In magnetostatic field B0Under the action of turn to and magnetostatic field B0The completely the same or almost the same direction in direction.
In the specific implementation process, pedestal 111 can be irony, and the first main magnet 112 and the second main magnet 113 can be equal
It for bar magnet, for example is in cuboid, and the first main magnet 112 is identical with the specification of the second main magnet 113.
The simple magnetostatic field B established by main magnet 1100, on the boundary for the detection zone 120 that main magnet 110 motivates
On it is often uneven, and phenomenon of demagnetizing can gradually occur in different temperatures or environment for institute's magnetic material, and focus magnetic
The effect of body 130 is to enhance magnetostatic field B by magnetic field superposition0And make magnetostatic field B0It is more uniform.
Focusing magnet 130 generally may be provided between the first main magnet 112 and the second main magnet 113, i.e. focusing magnet 130
It may be provided in the region surrounded jointly by pedestal 111, the first main magnet 112 and the second main magnet 113.Preferably, magnetic is focused
Body 130 may include the first focusing magnet 131 and the second focusing magnet 132, in which:
First focusing magnet 131 is close to the first main magnet 112, and the S of the first focusing magnet 131 is extremely far from pedestal 111, N
Extremely close in other words towards pedestal 111；
Second focusing magnet 132 is close to the second main magnet 113, and the N of the second focusing magnet 132 is extremely far from pedestal 111, S
Extremely close in other words towards pedestal 111.
Therefore, focusing magnet 130 using the above structure, can enhance magnetostatic field B0And establish main magnet 110
Magnetostatic field B0It is more uniform.
Please further refer to Fig. 1, the first focusing magnet 131 and the second focusing magnet 132 all can be bar magnet, such as
In cuboid.Also, the first focusing magnet 131 and the second focusing magnet 132 can be the identical bar magnet of specification.
Please further refer to Fig. 1, the first focusing magnet 131 can be parallel to the first main magnet 112 or first and focus magnetic
There is certain angle between body 131 and the first main magnet 112；Second focusing magnet 132 can also be parallel to the second main magnet
113 or second there is certain angle between focusing magnet 132 and the second main magnet 113.By controlling the first focusing magnet
Angle between 131 and the first angle and the second focusing magnet 132 and the second main magnet 113 between main magnet 112, energy
Enough enhance magnetostatic field B in detection zone 1200Intensity, while ensuring magnetostatic field B in sensitizing range0It is horizontal homogeneous.
Preferably, the angle between the first focusing magnet 131 and the first main magnet 112 is 0~15 °, the second focusing magnet
132 and the second angle between main magnet 113 be 0~15 °.It is further preferred that the first focusing magnet 131 and second focuses magnetic
Body 132 is symmetrical set, to further ensure that sensitizing range magnetostatic field B0For horizontal homogeneous.For different measurement objects and specific
Nuclear magnetic resonance excitation area, can with the angle between appropriate adjustment focusing magnet 130 and main magnet 110, focusing magnet 130
Adjustability plays the magnetostatic field B generated to main magnet 1100Focussing force so that the magnetic field of sensitizing range is more uniform.
In the present embodiment, unless otherwise noted, the angle between two magnets is the company between the pole N and the pole S with magnet
Subject to line, if being bar magnet than the first focusing magnet 131 and the first main magnet 112, then the pole N Yu the pole S of bar magnet
Between line, the as length direction of bar magnet is axial in other words.Such as when the first focusing magnet 131 and the first main magnetic
Angle between body 112 is 0 °, then it represents that two bar magnets are parallel in the longitudinal direction, i.e. the first focusing magnet 131 and
One main magnet 112 is each perpendicular to pedestal 111.
As illustrated by the arrows in fig. 1, when the pole S of the first focusing magnet 131, the second main magnet 113 of direction rotates, then can make
There is corresponding angle between first focusing magnet 131 and the first main magnet 112.Certainly, when the pole N of the first focusing magnet 131
It is rotated towards the second main magnet 113, can also make that there is corresponding angle between the first focusing magnet 131 and the first main magnet 112.
Similarly, when the pole N of the second focusing magnet 132 or the pole S are rotated towards the first main magnet 112, then can make the second focusing magnet 132 with
There is corresponding angle between second main magnet 113.
The basis of nmr quantitative analysis is that signal strength is directly proportional to proton spin number in hydrogeneous sample, sample
Measurement result is compared with standard specimen signal strength, the quantitative data being expressed as a percentage.And magnetostatic field B0With RF magnetic field B1
Orthogonal is the key that obtain peak signal.
In the present embodiment, the effect of radio-frequency antenna 140 is to generate and magnetostatic field B0Vertical RF magnetic field B1.Ordinary circumstance
Under, radio-frequency antenna 140 may include the switch of coil and the circuit connecting with coil and control circuit work, such as electricity
Sub switch.Specifically, coil can open electronic switch using the forms such as solenoid coil, radio-frequency antenna 140 generate with it is magnetostatic
Field B0Orthogonal RF magnetic field B1, after end-of-pulsing, radio-frequency antenna 140 is switched to receiver transmission line automatically by electronic switch, this
When radio-frequency antenna 140 serve receive nmr echo signal.
It please refers to Fig. 2 and combines Fig. 1, radio-frequency antenna 140 can specifically include two antennas (not shown), each antenna packet
U-shaped coil 141 and square coil 142 are included, and square coil 142 is surrounded by U-shaped coil 141, i.e. the setting of square coil 142 exists
In U-shaped 141 area defined of coil；Two antennas are symmetrical set, and keep the opening of two U-shaped coils 141 opposite.
Wherein, U-shaped coil 141 and square coil 142 generate electric current after powered up and form magnetic field, square coil 142
The magnetic field generated after powered up can offset the eddy current effect of U-shaped coil 141, to generate uniform RF magnetic field B1, then
NMR signal of the excitation in the hydrogen nuclei of hydrogeneous sample in detection zone.
It is appreciated that realize nuclear magnetic resonance, RF magnetic field B1Action direction should be with magnetostatic field B0Vertically, ordinary circumstance
Under, the plane where radio-frequency antenna 140 can be arranged in parallel with pedestal 111, i.e., the plane where radio-frequency antenna 140 is perpendicular to the
One main magnet 112, and radio-frequency antenna 140 is arranged in the first main magnet 112 far from 111 side of pedestal, the setting of focusing magnet 130 exists
In region between radio-frequency antenna 140 and pedestal 111.
It is appreciated that in the present embodiment, RF magnetic field B1Field strength should be much smaller than magnetostatic field B0Field strength.
Please further refer to Fig. 1, it is preferred that further ensure that magnetostatic field B0Uniformity, provided by the present embodiment
On-line NMR detection device can also include shimming magnet 150, or be tuning magnet.Shimming magnet 150 specifically can be with
It is arranged between the first main magnet 112 and the second main magnet 113, especially, shimming magnet 150 is arranged in the first focusing magnet
131 and second between focusing magnet 132；Also, the pole S the first main magnet 112 of direction of shimming magnet 150, shimming magnet 150
The pole N the second main magnet 113 of direction.
By the way that the shimming magnet 150 is arranged, magnetostatic field B can be promoted0Uniformity, promote main magnet 110 issue it is quiet
Magnetic field B0More evenly, it is ensured that the rotation direction of the hydrogen atom in hydrogeneous sample keeps height consistent, reduces between each hydrogen atom and turns
The deviation of dynamic angle, to guarantee the accuracy of testing result.
In a specific implementation process of the present embodiment, shimming magnet 150 is bar magnet, for example is in cuboid.Shimming magnet
150 can be specifically arranged perpendicular to the first main magnet 112, the pole S the first main magnet 112 of direction of shimming magnet 150, shimming magnet
150 pole N is towards the second main magnet 113, to help to realize shimming.In a specific implementation process of the present embodiment, as shown in Figure 1,
Shimming magnet 150 is generally located between radio-frequency antenna 140 and the pedestal 111 of main magnet 110, and shimming magnet 150 from the pole S to
The length direction of the pole N is parallel to pedestal 111.
On-line NMR detection device provided in this embodiment generates magnetostatic field B by main magnet 1100To hydrogeneous
The hydrogen atom of sample polarizes, and enhances magnetostatic field B by focusing magnet 1300And make magnetostatic field B0It is more uniform, pass through radio frequency
Antenna 140 generates RF magnetic field B1And it excites the hydrogen atom after being polarized to generate nuclear magnetic resonance and receives the echo letter of nuclear magnetic resonance
Number, so as to be detected to hydrogeneous sample.
Therefore, with existing compared with the means such as chemical method measure by the way of hydrogenous material, use is provided in this embodiment
On-line NMR detection device, hydrogeneous sample, which is placed in, can be detected and be obtained testing result in detection zone 120, no
The convenience of sample detection is improved only, detection time is shortened, simplifies detecting step, improves detection efficiency；And by
In without in advance chemically or physically being handled hydrogeneous sample, therefore hydrogeneous sample will not be damaged, be realized lossless
Detection.
Further, by the way that shimming magnet 150 is arranged, magnetostatic field B can also be made0It is more uniform, further increase detection
As a result accuracy.
Embodiment two
It please refers to Fig. 3 to Fig. 5 and combines Fig. 1, the present embodiment provides a kind of on-line NMR detection systems, including magnetic cup
The on-line NMR detection device 100 provided in shell 200, sample feeding mechanism (not shown) and embodiment one is provided, in which:
On-line NMR detection device 100 is contained in magnetic screen shell 200；
Sample feeding mechanism includes conveyer belt 310 and driving mechanism 320, and driving mechanism 320 is for driving the transmission of conveyer belt 310 to contain
Hydrogen sample, so that hydrogeneous sample being capable of region 120 after testing.
Specifically, magnetic screen shell 200 is used to protect on-line NMR detection device 100, and shield the external world
Influence of the electromagnetic wave to internal circuit and the electromagnetic wave outside for preventing on-line NMR detection device 100 from generating radiation.Magnetic
Shielding shell 200 can be made of common metal shield materials, and the present embodiment is not specially limited herein.
Sample feeding mechanism specifically may be mounted in magnetic screen shell 100 comprising conveyer belt 310 and driving mechanism 320.This
Embodiment is not specially limited the concrete form of driving mechanism 320, as long as transmission belt 310 can be driven to move, with transmission
Hydrogeneous sample, make hydrogeneous sample after testing region 120 and realize the accurate detection of hydrogeneous sample.
In the present embodiment, it generally may include two bands that the mode that belt transmission can be used in sample feeding mechanism, which transports hydrogeneous sample,
Wheel (not shown) and the belt (not shown) being stretched on two belt wheels.And two belt wheels can be further divided into driving wheel and from
Driving wheel, belt connection circularize.Due to tensioning, pressing force just is produced in the contact portion of belt and belt wheel.When actively
When wheel operating, is acted on by frictional force and drive belt, and belt then drives driven wheel to be operated.It thereby realizes to be detected
Hydrogeneous sample transmission.
In the preferred scheme of the present embodiment, can control the transmission speed of conveyer belt 310 is 0~0.4m/s.Such as it is above-mentioned
By the way of belt transmission, then can control the transmission speed of belt is 0~0.4m/s, to ensure that it is total that nuclear-magnetism occurs for hydrogeneous sample
It shakes and realizes accurate detection.
Further, as shown in Figure 3 and Figure 5, sample inlet 210 and sample can also be opened up on magnetic screen shell 200
Hydrogeneous sample to be detected can be placed on conveyer belt 310 by outlet 220 by the sample inlet 210 before detection；Detection
The hydrogeneous sample completed is continued to transmit by conveyer belt 310, and can be taken out by sample export 320.
It is appreciated that on-line NMR detection system can also include that digital master control circuit (is not schemed in the present embodiment
Show) and processor (not shown), wherein digital master control circuit has following three function: 1) receiving what simultaneously interpretation process device issued
Instruction；2) according to the instruction of processor, CPMG nuclear magnetic resonance pulse sequence is formed；3) echo that radio-frequency antenna 140 issues is received
Signal, and echo-signal is transmitted to processor.After processor receives echo-signal, echo-signal is parsed, is realized hydrogeneous
The accurate detection of sample.
Embodiment three
Referring to FIG. 1, the present embodiment provides a kind of on-line NMR detection method, using online described in embodiment one
Nuclear magnetic resonance detection device 100 carries out, comprising:
Hydrogeneous sample is placed in detection zone 120, keeps main magnet 110 and focusing magnet 130 former to the hydrogen of hydrogeneous sample
Son polarizes, and so that radio-frequency antenna 140 is excited the hydrogen atom after being polarized and generates nuclear magnetic resonance, and uses radio-frequency antenna 140
Receive the echo-signal of nuclear magnetic resonance.
As previously mentioned, the basis of nmr quantitative analysis is contained proton spin number in signal strength and sample
It is directly proportional, sample measurement result is compared with standard specimen signal strength, the quantitative data being expressed as a percentage.
Nuclear magnetic resonance detected is small-signal, very distinct issues when signal-to-noise ratio is low.Usual method is to observation
Signal is added up repeatedly to realize.Existing research shows that observation signal adds up n times, and signal-to-noise ratio will increase n1/2Times.Field strength is higher,
Signal-to-noise ratio is higher.
In the present embodiment, the detection for hydrogeneous sample is based on spin echo technique.It is well known that echo is weight
Poly- NMR signal, it as after 90 ° of pulses 180 ° of pulse reunions effect as a result, in original NMR free induction decay signal
FID occurs after disappearance long period of time, and can repeatedly be met again one by one by 180 ° of RF pulse strings,
Thus a convolution echo is obtained.By receiving the echo-signal of nuclear magnetic resonance and being parsed, to obtain hydrogeneous sample
The proton relaxation time of (observation object) and the diffusion motion information of fluid molecule.
In the present embodiment, specifically, lateral relaxation time may be selected as measurement object, longitudinal relaxation is then used as weighting
Mechanism realizes accurately identifying to fluid composition (such as the water, crude oil) for being full of hydrogen atom.
It should be noted that in the description of the present invention, term " first ", " second ", which are only used for facilitating, describes different magnetic
Body is not understood to indicate or imply ordinal relation or relative importance.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of on-line NMR detection device characterized by comprising
Main magnet, it is former with the hydrogen to the hydrogeneous sample in the detection zone for generating magnetostatic field in detection zone
Son polarizes；
Focusing magnet is arranged in the magnetostatic field, to enhance the magnetostatic field and keep the magnetostatic field more uniform；
Radio-frequency antenna, for generating RF magnetic field in the detection zone, to excite the hydrogen atom after being polarized to generate nuclear-magnetism
Resonance；The radio-frequency antenna is also used to receive the echo-signal of nuclear magnetic resonance.
2. on-line NMR detection device according to claim 1, which is characterized in that the main magnet include pedestal with
And it is vertically disposed on the first main magnet and the second main magnet on the pedestal, in which:
The S of first main magnet is extremely arranged far from the pedestal, the pole N towards the pedestal；
The N of second main magnet is extremely arranged far from the pedestal, the pole S towards the pedestal.
3. on-line NMR detection device according to claim 2, which is characterized in that the focusing magnet is arranged in institute
It states between the first main magnet and the second main magnet, the focusing magnet includes the first focusing magnet and the second focusing magnet, in which:
First focusing magnet is close to first main magnet, and the S of first focusing magnet is extremely far from the pedestal, N
Extremely close to the pedestal；
Second focusing magnet is close to second main magnet, and the N of second focusing magnet is extremely far from the pedestal, S
Extremely close to the pedestal.
4. on-line NMR detection device according to claim 3, which is characterized in that first focusing magnet and institute
Stating the angle between the first main magnet is 0~15 °, and the angle between second focusing magnet and second main magnet is 0
~15 °.
5. on-line NMR detection device according to claim 1-4, which is characterized in that the radio-frequency antenna
Including two antennas, each antenna includes U-shaped coil and square coil, and the square coil is by the U-shaped coil institute
It surrounds；Two antennas are symmetrical set, and keep the opening of two U-shaped coils opposite.
6. on-line NMR detection device according to claim 1, which is characterized in that the field strength of the RF magnetic field is big
In the field strength of the magnetostatic field.
7. according to the described in any item on-line NMR detection devices of claim 2-4, which is characterized in that further include shimming magnetic
Body, the shimming magnet is arranged between first main magnet and second main magnet, and the pole the S court of the shimming magnet
To first main magnet, the pole N of the shimming magnet is towards second main magnet.
8. a kind of on-line NMR detection system, which is characterized in that including magnetic screen shell, sample feeding mechanism and claim
The described in any item on-line NMR detection devices of 1-7, in which:
The on-line NMR detection device is contained in the magnetic screen shell；
The sample feeding mechanism includes conveyer belt and driving mechanism, and the driving mechanism is for driving the conveyer belt to transmit hydrogeneous sample
Product, so that the hydrogeneous sample can pass through the detection zone.
9. on-line NMR detection system according to claim 8, which is characterized in that the transmission speed of the conveyer belt
For 0~0.4m/s.
10. a kind of on-line NMR detection method, which is characterized in that described in any item in line core using claim 1-7
Magnetic resonance detection device carries out, comprising:
Hydrogeneous sample is placed in the detection zone, makes the main magnet and focusing magnet to the hydrogen atom of the hydrogeneous sample
It polarizes, the hydrogen atom after being polarized the radio-frequency antenna excitation simultaneously generates nuclear magnetic resonance, and uses the radio-frequency antenna
Receive the echo-signal of nuclear magnetic resonance.
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