CN104991207A - RF coil system for nuclear quadrupole resonance detection - Google Patents
RF coil system for nuclear quadrupole resonance detection Download PDFInfo
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- CN104991207A CN104991207A CN201510465114.8A CN201510465114A CN104991207A CN 104991207 A CN104991207 A CN 104991207A CN 201510465114 A CN201510465114 A CN 201510465114A CN 104991207 A CN104991207 A CN 104991207A
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Abstract
The present invention relates to an RF coil system for nuclear quadrupole resonance detection. The system comprises a transmitting coil, a receiving coil, a matching circuit and a coil frame. The transmitting coil is formed by transmitting coil units, and a Helmholtz coil is formed by each two adjacent transmitting coil units. The receiving coil is formed by receiving coil units, and an even number of the receiving coil units are arranged between each two transmitting coil units, and the receiving coil units between two transmitting coil units are symmetrically placed relative to the symmetrical center planes of the two transmitting coil units are in reverse connection to eliminate the coupling between the transmitting coil and the receiving coil. The transmitting coil, the receiving coil and the matching circuit are fixed on the coil frame. The distance between the receiving coil units is determined according to the time of detecting a sample to be detected for one time and a conveying belt speed, and the time that the conveying belt passes the receiving coil is the time needed in the detection of a mail for one time. According to the system, the device can sensitively and accurately detect an article.
Description
Technical field
The present invention relates to nuclear quadrupole resonance safety check technical field, be specifically related to a kind of rf coil system detected for nuclear quadrupole resonance.
Background technology
At present, a lot of in the technical field of field of safety check use.Such as: metal detection technology, x-ray absorb or scattering, neutron detection technology, terahertz detection technology etc., but they all have limitation in various degree.Compared with numerous technology, atom nuclear quadrupole resonance detection technique shows advance because of harmless, safety, Object Classification.Utilize technique can carry out the dangerous substance such as explosive, drugs accurately qualitative.
For nuclear quadrupole resonance detection technique, number of patent application is that the patent of CN201410779016.7 is applicable in hand-held nuclear quadrupole resonance rays safety detection apparatus, hand-held nuclear quadrupole resonance rays safety detection apparatus can move down dynamic in people's manual manipulation, inspected object or the tested part of article is made to be in the most strength of coil transmissions center court, and for the nuclear quadrupole resonance detection technique system of channel-type, the space that coil is formed is exactly sense channel, inspected object position is in the channel random, so require to construct uniform as far as possible radiation field in passage, the radiation that article are subject to and its random site in passage have nothing to do.
Summary of the invention
The object of the present invention is to provide a kind of rf coil system detected for nuclear quadrupole resonance, this radio-frequency coil provides uniform as far as possible passage radiation field, and the position making detection sensitivity and article residing in passage has nothing to do.
For achieving the above object, present invention employs following technical scheme:
A kind of rf coil system detected for nuclear quadrupole resonance, comprise transmitting coil, receiving coil, match circuit and magazine, transmitting coil, receiving coil, match circuit are fixed on magazine, it is characterized in that, described transmitting coil and receiving coil form spatial structure, wherein transmitting coil comprises at least 2 transmitting coil unit, often adjacent two transmitting coil unit composition helmholtz coil.
Further, described transmitting coil is connected with match circuit respectively with receiving coil.
Further, described receiving coil comprises at least 2 receiving coil unit, places the even number receiving coil unit being not less than 2 in the middle of every two adjacent transmitting coil unit.
Further, the receiving coil unit between every two transmitting coil unit is placed about transmitting coil unit ymmetry center plane symmetry, and is coupled with transmitting coil by anti-phase connection.
Further, between described transmitting coil unit, direction of current is consistent, and is connected in series or is connected in parallel.
Further, described receiving coil units in series or be connected in parallel.
Further, be parallel to each other between described transmitting coil unit and receiving coil unit and be wound on magazine.
Further, described transmitting coil unit and receiving coil unit are formed by the coiling of wire single-turn or multi-turn.
From above technical scheme, the invention has the beneficial effects as follows:
(1) the present invention uses helmholtz coil, two wherein adjacent transmitting coil unit form a helmholtz coil, this makes the magnetic field between two transmitting coil unit be uniform, when all transmitting coils are made up of helmholtz coil, in the space that transmitting coil distributes, there is the field homogeneity region of maximum magnitude.Transmitting coil of the present invention comprises at least 2 transmitting coil unit, such two transmitting coil unit just form a helmholtz coil, when transmitting coil comprises 3 transmitting coil unit, first transmitting coil unit and second transmitting coil unit form helmholtz coil, second transmitting coil unit and the 3rd transmitting coil unit also form helmholtz coil, and the magnetic field making like this from first transmitting coil unit to the 3rd transmitting coil unit is all uniform.Which increase the scope of uniform magnetic field.
(2) the even number receiving coil unit being not less than 2 is had in the present invention between every two transmitting coil unit, even number receiving coil unit is placed about the ymmetry center plane symmetry of transmitting coil unit, and eliminated by anti-phase connection and be coupled with helmholtz coil, make mutual inductance between receiving coil and transmitting coil close to 0 like this, thus the strong-electromagnetic field eliminated from transmitting coil is on the impact of receiving coil.
Accompanying drawing explanation
Fig. 1 is rectangle helmholtz coil in the present invention;
Fig. 2 is match circuit connection layout in the present invention;
Fig. 3 is the structural drawing of embodiment 1 in the present invention;
Fig. 4 is the structural drawing of embodiment 2 in the present invention;
Fig. 5 is the structural drawing of embodiment 3 in the present invention.
Wherein:
1, transmitting coil, 1-1, the first transmitting coil unit, 1-2, the second transmitting coil unit, 1-3, the 3rd transmitting coil unit, 2, receiving coil, 2-1, the first receiving coil unit, 2-2, the second receiving coil unit, 2-3, the 3rd receiving coil unit, 2-4, the 4th receiving coil unit, 3, match circuit, 4, magazine.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described:
As shown in Figure 1, rectangle helmholtz coil is made up of the first transmitting coil unit 1-1 and the second transmitting coil unit 1-2, first transmitting coil unit 1-1 and the second transmitting coil unit 1-2 is formed by the coiling of wire single-turn or multi-turn, forms the basic uniform excitation electromagnetic field of an intensity between the first transmitting coil unit 1-1 and the second transmitting coil unit 1-2.
Wherein, the length of side of the first transmitting coil unit 1-1 and the second transmitting coil unit 1-2 is as supposed in figure, and coil turn is N, and electric current is I, and the direction of two coils is consistent.By any magnetic field in the known z-axis of Biot-Savart law
Consider the symmetry of showing up, Bz is deployable is:
Absolute value is less than to the z of 1, the item that on the right of (2) formula, number of times is higher, less to the contribution of Bz.For making the field near initial point even as much as possible, 2 items on the right of (2) formula should be made to be zero, and this just requires:
(1) formula is substituted into (3) formula can obtain:
4D(A+D)(B+D)(A+B+D)[(A+D)
2+(B+D)
2]
-2(A+B+D)
2[(A-3D)(B+D)
3+(B-3D)(A+D)
3]
-(A+D)
2(B+D)
2(A+B-2D)(A+B+2D)＝0 (4)
Wherein A=a
2, B=b
2, D=d
2.
If our channel cross-section is known, just helmholtz coil spacing d can be calculated according to the cross section length of side by equation (4).
Embodiment 1
As shown in Figures 2 and 3, rf coil system comprises transmitting coil 1, receiving coil 2, match circuit 3 and magazine 4.Transmitting coil 1, receiving coil 2 and match circuit 3 are fixed on magazine 4.Transmitting coil 1 and receiving coil 2 form spatial structure.Wherein transmitting coil 1 comprises the first transmitting coil unit 1-1 and the second transmitting coil unit 1-2, and receiving coil 2 comprises the first receiving coil unit 2-1 and the second receiving coil unit 2-2.First receiving coil unit 2-1 and the second receiving coil unit 2-2 is between two transmitting coil unit, and symmetrical about the ymmetry center plane of the first transmitting coil unit 1-1 and the second transmitting coil unit 1-2.First transmitting coil unit 1-1 and the second transmitting coil 1-2 is for being connected in series, and both direction of current are consistent, determine apart from rear formation helmholtz coil.First receiving coil unit 2-1 and the second receiving coil unit 2-2 connects anti-phase connection, and last transmitting coil 1 and receiving coil 2 access in match circuit 3.In implementation process, transmitting coil 1 and receiving coil 2 form coupling, mutual inductance is therebetween made to be 0, thus nuclear quadrupole resonance detection system just can normally be worked without the need to electromagnetic screen, and effectively can suppress space spurious electromagnetic waves interference, improve the signal to noise ratio (S/N ratio) of nuclear quadrupole resonance signal.
Embodiment 2
As shown in Figure 2 and Figure 4, rf coil system comprises transmitting coil 1, receiving coil 2, match circuit 3 and magazine 4.Transmitting coil 1, receiving coil 2 and match circuit 3 are fixed on magazine 4.Transmitting coil 1 and receiving coil 2 form spatial structure.Wherein transmitting coil 1 comprises the first transmitting coil unit 1-1 and the second transmitting coil unit 1-2, receiving coil 2 comprises the first receiving coil unit 2-1, the second receiving coil unit 2-2, the 3rd receiving coil unit 2-3 and the 4th receiving coil unit 2-4, four all between two transmitting coil unit, and symmetrical about the ymmetry center plane of the first transmitting coil unit 1-1 and the second transmitting coil unit 1-2.First transmitting coil unit 1-1 and the second transmitting coil 1-2 is for being connected in series, and both direction of current are consistent, determine apart from rear formation helmholtz coil.Wherein pass through anti-phase connection successively between the first receiving coil unit 2-1 to the 4th receiving coil unit 2-4, and be coupled with helmholtz coil, last transmitting coil 1 and receiving coil 2 access in match circuit.Mutual inductance between such transmitting coil 1 and receiving coil 2 is 0, and nuclear quadrupole resonance detection system just can normally be worked without the need to electromagnetic screen, and effectively can suppress space spurious electromagnetic waves interference, improves the signal to noise ratio (S/N ratio) of nuclear quadrupole resonance signal.
Embodiment 3
As shown in Figure 2 and Figure 5, rf coil system comprises transmitting coil 1, receiving coil 2, match circuit 3 and magazine 4.Transmitting coil 1, receiving coil 2 and match circuit 3 are fixed on magazine 4.Transmitting coil 1 and receiving coil 2 form spatial structure.Wherein transmitting coil 1 comprises the first transmitting coil unit 1-1, the second transmitting coil unit 1-2 and the 3rd transmitting coil unit 1-3, and three is connected in parallel, and direction of current is consistent, determines apart from helmholtz coil between rear adjacent two transmitting coil unit.Receiving coil comprises the first receiving coil unit 2-1, the second receiving coil unit 2-2, the 3rd receiving coil unit 2-3 and the 4th receiving coil unit 2-4, wherein the first receiving coil unit 2-1 and the second receiving coil unit 2-2 is between the first transmitting coil unit 1-1 and the second transmitting coil unit 1-2, about the first transmitting coil unit 1-1 and the second transmitting coil unit ymmetry center plane symmetry, anti-phase connection between the first receiving coil unit 2-1 and the second receiving coil unit 2-2.First transmitting coil unit 1-1, the second transmitting coil unit 1-2, the first receiving coil unit 2-1, the second receiving coil unit 2-2 are coupled.Same, 3rd receiving coil unit 2-3 and the 4th receiving coil unit 2-4 is between the second transmitting coil unit 1-2 and the 3rd transmitting coil unit 1-3, about the second transmitting coil unit 1-2 and the 3rd transmitting coil unit 1-3 ymmetry center plane symmetry, anti-phase connection between the 3rd receiving coil unit 2-3 and the 4th receiving coil unit 2-4.Second transmitting coil unit 1-2, the 3rd transmitting coil unit 1-3, the 3rd receiving coil unit 2-3, the 4th receiving coil unit 2-4 are coupled.In brief, transmitting coil 1 and receiving coil 2 form coupling, and mutual inductance is therebetween 0, thus nuclear quadrupole resonance detection system just can normally be worked without the need to electromagnetic screen, effectively can suppress space spurious electromagnetic waves interference, improve the signal to noise ratio (S/N ratio) of nuclear quadrupole resonance signal.
In the above-described embodiments, the plane of described ymmetry center plane represented by the dotted line in figure.Transmitting coil unit and receiving coil unit are formed by the coiling of wire single-turn or multi-turn.Each other in series or parallel between unit, form helmholtz coil between two adjacent transmitting coil unit, the receiving coil unit between each helmholtz coil and the mutual inductance of this helmholtz coil are 0.
Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determines.
Claims (8)
1. the rf coil system detected for nuclear quadrupole resonance, comprise transmitting coil, receiving coil, match circuit and magazine, transmitting coil, receiving coil, match circuit are fixed on magazine, it is characterized in that, described transmitting coil and receiving coil form spatial structure, wherein transmitting coil comprises at least 2 transmitting coil unit, often adjacent two transmitting coil unit composition helmholtz coil.
2. a kind of rf coil system detected for nuclear quadrupole resonance according to claim 1, it is characterized in that, described transmitting coil is connected with match circuit respectively with receiving coil.
3. a kind of rf coil system detected for nuclear quadrupole resonance according to claim 1, it is characterized in that, described receiving coil comprises at least 2 receiving coil unit, places the even number receiving coil unit being not less than 2 in the middle of every two adjacent transmitting coil unit.
4. a kind of rf coil system detected for nuclear quadrupole resonance according to claim 3, it is characterized in that, receiving coil unit between every two transmitting coil unit is placed about transmitting coil unit ymmetry center plane symmetry, and is coupled with transmitting coil by anti-phase connection.
5. a kind of rf coil system detected for nuclear quadrupole resonance according to claim 1, it is characterized in that, between described transmitting coil unit, direction of current is consistent, and is connected in series or is connected in parallel.
6. a kind of rf coil system detected for nuclear quadrupole resonance according to claim 4, is characterized in that, described receiving coil units in series or be connected in parallel.
7. a kind of rf coil system detected for nuclear quadrupole resonance according to claim 4, it is characterized in that, being parallel to each other between described transmitting coil unit and receiving coil unit is wound on magazine.
8. a kind of rf coil system detected for nuclear quadrupole resonance according to claim 1, it is characterized in that, described transmitting coil unit and receiving coil unit are formed by the coiling of wire single-turn or multi-turn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510465114.8A CN104991207A (en) | 2015-07-30 | 2015-07-30 | RF coil system for nuclear quadrupole resonance detection |
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| CN201510465114.8A CN104991207A (en) | 2015-07-30 | 2015-07-30 | RF coil system for nuclear quadrupole resonance detection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10756580B2 (en) | 2016-05-25 | 2020-08-25 | Oxford University Innovation Limited | Wireless power transfer system |
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| JPH05223758A (en) * | 1992-02-12 | 1993-08-31 | Hitachi Medical Corp | Pulse nuclear tetrapole resonance device |
| CN102171555A (en) * | 2008-10-06 | 2011-08-31 | 国立大学法人大阪大学 | Equipment for inspecting explosives and/or iilicit drugs, antenna coil and method for inspecting explosives and/or iilicit drugs |
| CN202568255U (en) * | 2009-04-27 | 2012-12-05 | 艾斯拜克特磁铁技术有限公司 | A spatially fixed coupled imaging device in a magnetic resonance imaging system |
| CN102884449A (en) * | 2010-02-02 | 2013-01-16 | 莫弗探测公司 | Passenger scanning systems for detecting contraband |
| CN103760506A (en) * | 2012-09-07 | 2014-04-30 | 莫弗探测公司 | Nuclear quadrupole resonance system and method of using the same |
| CN104502870A (en) * | 2014-12-15 | 2015-04-08 | 安徽瑞迪太检测技术有限公司 | Planer weak coupling antenna applied to nuclear quadrupole resonance detection system |
| CN204832479U (en) * | 2015-07-30 | 2015-12-02 | 安徽瑞迪太检测技术有限公司 | A RF coil system for examining electric quadrupole moment detection of resonating |
-
2015
- 2015-07-30 CN CN201510465114.8A patent/CN104991207A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05223758A (en) * | 1992-02-12 | 1993-08-31 | Hitachi Medical Corp | Pulse nuclear tetrapole resonance device |
| CN102171555A (en) * | 2008-10-06 | 2011-08-31 | 国立大学法人大阪大学 | Equipment for inspecting explosives and/or iilicit drugs, antenna coil and method for inspecting explosives and/or iilicit drugs |
| CN202568255U (en) * | 2009-04-27 | 2012-12-05 | 艾斯拜克特磁铁技术有限公司 | A spatially fixed coupled imaging device in a magnetic resonance imaging system |
| CN102884449A (en) * | 2010-02-02 | 2013-01-16 | 莫弗探测公司 | Passenger scanning systems for detecting contraband |
| CN103760506A (en) * | 2012-09-07 | 2014-04-30 | 莫弗探测公司 | Nuclear quadrupole resonance system and method of using the same |
| CN104502870A (en) * | 2014-12-15 | 2015-04-08 | 安徽瑞迪太检测技术有限公司 | Planer weak coupling antenna applied to nuclear quadrupole resonance detection system |
| CN204832479U (en) * | 2015-07-30 | 2015-12-02 | 安徽瑞迪太检测技术有限公司 | A RF coil system for examining electric quadrupole moment detection of resonating |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10756580B2 (en) | 2016-05-25 | 2020-08-25 | Oxford University Innovation Limited | Wireless power transfer system |
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