CN108414956B - A kind of nuclear quadruple resonance detection system and its antenna - Google Patents
A kind of nuclear quadruple resonance detection system and its antenna Download PDFInfo
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- CN108414956B CN108414956B CN201810014705.7A CN201810014705A CN108414956B CN 108414956 B CN108414956 B CN 108414956B CN 201810014705 A CN201810014705 A CN 201810014705A CN 108414956 B CN108414956 B CN 108414956B
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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
- G01R33/34092—RF coils specially adapted for NMR spectrometers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
Abstract
The invention belongs to nuclear quadrupole resonance (Nuclear Quadrupole Resonance,) and the applied technical field of earth's magnetic field NMR system NQR, provide a kind of nuclear quadruple resonance detection system and its antenna, the antenna includes first coil, and the first coil forms the first figure；Second coil, second coil form second graph；The gradient antenna that the first coil and second coil are constituted, while receiving from target area signal and extraneous radio frequency interference；Wherein, the first coil and second coil are generally aligned in the same plane, and the coiling of the first coil and second coil is contrary, and the second graph is uniformly distributed in around first figure, first figure and the second graph area equation.The solution of the present invention can effectively improve antenna when detecting NQR or applied to ground magnetic resonance to the rejection ability of radio interference in environment, and enhance the detectability of signal, to improve the signal noise ratio of measuring system.
Description
Technical field
The invention belongs to nuclear quadrupole resonance and the applied technical fields more particularly to one of earth's magnetic field NMR system
Kind nuclear quadrupole resonance detection system and its antenna.
Background technique
The signal that nuclear quadrupole resonance technology is extracted objectively reflects what the atomic nucleus under the specific structure of matter was presented
Electric structure, therefore this technology can be used to the element or same position that detection and analysis contains quadrupole moment nuclear structure
Element, such as nitrogen 14 (N14), potassium 39, chlorine 35 and chlorine 37, to can determine that depositing for the substance containing this element or isotope
?.In particular, explosive, nicotine, drug generally contain N14 ingredient, and explosive is the common of terrorist menaces modern society
Means, carrying out reliably detecting to it is the necessary program for safeguarding public safety.It can be targetedly with quadrupole resonance technology
Ground checks destructor, such as land mine or roadside bomb.Quadrupole resonance technology can also be used to carry out airport passenger or
The safety check of any public arena.The frequency of the quadrupole resonance of common ingredient relevant to explosive is about in 500KHz to 5MHz
Range compared with mr techniques, quadrupole resonance technology does not need externally-applied magnetic field.
Earth's magnetic field mr techniques be using the magnetic field of the earth as polarization field B0 required for magnetic resonance, polarized water or
The proton in hydrogen atom in petroleum components, by antenna emit excitation electromagnetic field magnetic resonance is done to this come detect underground water or
Cause the petroleum of underground pollution.The intensity in earth's magnetic field is about 0.5 Gauss, and corresponding drawing horse (Lamar) magnetic resonance frequency is big
About it is slightly above 2000Hz.
The common ground of above two resonance signal is that signal amplitude is extremely small, and its working frequency is distributed in mankind's text
Within the scope of the common electromagnetic interference that change activity generates.For example, the power frequency electrical interference of 40 multiple harmonics is (for the Hz noise of 50Hz
Source) interference to earth's magnetic field NMR signal, Yi Jizhong, short-wave radio broadcast the interference to quadrupole resonance signal.Cause
This, when detecting explosive under unshielded environments using these resonance techniques, environmental disturbances just become a stubborn problem.
Therefore, exploitation inhibits the antenna of this interference and signal processing method to improve signal-to-noise ratio, is always that these technologies are applied successfully
It is crucial.
Since above two technology has in structure and faces using the difficult general character above to be solved, below we concentrate table
State around quadrupole resonance technology development and there are the problem of.In narration, antenna and coil the two words are possible to foundation
Occasion can be used alternatingly.
The traditionally typical structure of the most common antenna for inhibiting external interference, the gradient day being made of two coils
Line.Two coil connects in this way, to guarantee that the magnetic vector direction generated is just opposite in two coil plane.Object
In reason, apply the field distribution that current known generates in space, referred to as lead-field, the distribution of lead-field determines same line
Enclose the spatial sensitivity profile when being used as measurement.This reciprocal relation is referred to as the reciprocity law of electromagnetic field.Therefore, aforementioned ladder
The feature of degree antenna, which ensure that observantly to detect, is located at the NQR signal that neighbouring tested explosive generates, and to remote outer
The interference from interference source have good resistant function.This is because the distance relative to interference source, in gradient antenna two
Between a coil apart from very little, the interference that the distant place received is transmitted manifests identical interference strength and opposite on two coil
Phase, therefore the two is offset through gradient antenna.And for the signal from neighbouring explosive, it is special with stronger gradient
Property, therefore antenna can sense the gradient component, so that output signal is for subsequent conditioning circuit enhanced processing.In order to improve letter in practice
It makes an uproar and compares, receiving antenna is often tuned in working frequency.Such conventional aerial is in most cases that can be satisfied with work
's.But in NQR system, since signal is extremely small, the interference from interference source even has small gradient component,
Also it is enough to interfere measured signal, influences processing analysis and judgement.
It is similar with above-mentioned gradient antenna, only allow tested explosive to occupy one side of gradient coil namely only in application
Only one coil emits electromagnetic field and receives NQR signal, another coil farther out from explosive, only perception interference.Because dry
On the coil of two opposite in phase for disturbing while appearing in gradient antenna, to offset each other.Such antenna structure, due to more
The coil of a not opposite in phase for perceptual signal out, therefore the thermal noise of antenna system is increased, to reduce noise
Than.
Another anti-interference antenna different with gradient antenna is to place several auxiliary near main transmitting/measuring coil
Antenna, such as three orthogonal coils, to detect three orthogonal separations of interference.These auxiliary antennas are independently of main measurement day
Line, it is remote enough apart from primary antenna, it is not involved in transmitting electromagnetic field and receives NQR signal.In this way, interference letter provided by auxiliary antenna
Breath can effectively be eliminated by hardware or software processing method from main Measurement channel, to inhibit to interfere.Although this
The Antenna Design of sample has been applied to land mine inspection, still, if what the interference of main measurement antenna induction and auxiliary antenna received
Interference correlation cannot be guaranteed that then the anti-interference ability of this antenna will deteriorate.In practice, in order to guarantee that auxiliary antenna is not examined
Measure useful information, it is necessary to and main measurement antenna keeps suitable distance, but this be likely to decrease again interfere primary antenna with it is auxiliary
Correlation after helping antenna respectively space obtaining, so that the interference for making to be retained in treated signal increases.On the contrary, if
Reduce the distance of ancillary coil and main measuring coil to guarantee the correlation of interference, ancillary coil is possible to also detect that useful
Information reduces signal-to-noise ratio so that a part of useful information is mistaken for interference and is eliminated in processes.Therefore, these are traditional
The antenna system that technical solution is realized all there is anti-interference ability and improves the contradiction of signal-to-noise ratio, and high anti-interference, high noise
The measurement antenna of ratio is using NQR technology in the core of explosive detection.In this regard, the invention proposes a kind of new day knots
Structure meets high anti-jamming capacity requirement, while maximizes signal-to-noise ratio.
Summary of the invention
The purpose of the present invention is to provide a kind of nuclear quadruple resonance detection system and its antennas, are used for nuclear quadrupole resonance
Technology detects explosive, can be used for earth's magnetic field magnetic resonance detection underground water and underground oil leak.Aim to solve the problem that traditional skill
There is contradiction in anti-interference ability present in art scheme and high s/n ratio.
A kind of nuclear quadruple resonance detection antenna, the antenna include:
First coil, the first coil are formed with the first figure；
Second coil, second coil are formed with second graph；
The gradient antenna that the first coil and second coil are constituted, while receiving and coming from target area signal and the external world
Radio frequency interference；
Wherein, the first coil and second coil are generally aligned in the same plane, the first coil and second line
The coiling of circle is contrary, and the second graph is uniformly distributed in around first figure, first figure and described the
Two graphics areas are equal.
In addition, additionally providing a kind of detection system of nuclear quadrupole resonance, comprising:
First coil, the first coil are formed with the first figure；
Second coil, second coil are formed with second graph；
The gradient antenna that the first coil and second coil are constituted, while receiving and coming from target area signal and the external world
Radio frequency interference；
Wherein, the first coil and second coil are generally aligned in the same plane, the first coil and second line
The coiling of circle is contrary, and the second graph is uniformly distributed in around first figure, first figure and described the
Two graphics areas are equal；
Electrical pulse sequence power amplifier, the electrical pulse sequence power amplifier respectively with the first coil and described
Second coil connection, for making the first coil and second coil generate activation sequence pulsed magnetic field；
Signal receiving unit receives and processes the first coil and the received radiofrequency signal of the second coil for signal.
In addition, additionally providing another nuclear quadruple resonance detection system, comprising:
First coil, the first coil are formed with the first figure；
Second coil, second coil are formed with second graph；
The gradient antenna that the first coil and second coil are constituted, while receiving and coming from target area signal and the external world
Radio frequency interference；
Wherein, the first coil and second coil are generally aligned in the same plane, the first coil and second line
The coiling of circle is contrary, and the second graph is uniformly distributed in around first figure, first figure and described the
Two graphics areas are equal；
Pulse train power amplifier, the electrical pulse sequence power amplifier is connect with the first coil, for making
The first coil generates activation sequence pulsed magnetic field；
Signal receiving unit receives and processes the first coil and the received radiofrequency signal of the second coil for signal.
Above-mentioned nuclear quadruple resonance detection antenna, first coil and the second coil constitute gradient antenna, receive simultaneously
Passback radiofrequency signal from object detection area and interference radiofrequency signal and traditional 8-shaped gradient antenna from the external world
It compares, since the second coil is generally evenly distributed in the periphery of first coil, no matter whether target detection thing is symmetrical
The object detection area under antenna, the second coil can play the role of enhance signal, and this central symmetry constitute gradient
Antenna further ensure that the correlation on gradient antenna two coil is interfered in a distant place, more preferably offset interference to reach
Purpose.And the direction of the second coil winding in gradient antenna and main coil (i.e. first coil) are unanimously, physically, in this way
Structure ensure that the antenna system have high measurement sensitivity.In conclusion the solution of the present invention can effectively improve day
Line is detecting NQR or when ground magnetic resonance signal to the rejection ability of radio interference in environment, and enhances the detection energy of signal
Power, to improve the signal noise ratio of system.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the nuclear quadruple resonance detection antenna that present pre-ferred embodiments provide；
Fig. 2 is the structural schematic diagram for the nuclear quadruple resonance detection system that first embodiment of the invention provides；
Fig. 3 is a kind of structural representation for embodiment nuclear quadruple resonance detection system that second embodiment of the invention provides
Figure；
Fig. 4 is that the structure for the another embodiment nuclear quadruple resonance detection system that second embodiment of the invention provides is shown
It is intended to；
Fig. 5 is in first embodiment of the invention and second embodiment, and objective plane of the antenna at 0.5 meter is along any radial
The distribution schematic diagram of the excitation field vertical direction component (Bz) of generation.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figures 1 to 4, the embodiment of the invention provides a kind of nuclear quadruple resonance detection systems, specifically, this reality
Applying nuclear quadruple resonance detection system described in example includes: nuclear quadruple resonance detection antenna, electrical pulse sequence power amplification
Device 200 and signal receiving unit 300.
Wherein, as shown in Figure 1, the nuclear quadruple resonance detection antenna is the gradient day of one group of two coil configuration composition
Line, the external interference signal received can be eliminated when receiving signal, this group of coil includes first coil Q1 and the second coil Q2.
Specifically, the coiling of first coil Q1 and the second coil Q2 are contrary, and are generally aligned in the same plane, first coil
Q1 is formed with the first figure, and the second coil Q2 is formed with second graph, the first figure and second graph area equation, second graph
It is uniformly distributed in around the first figure.
Further, first coil Q1 and the second coil Q2 is metal (such as copper wires) ring of benign conductor or by extremely
A few conducting wire coiling forms；First coil Q1 formed the first figure and the second coil Q2 formed second graph be axis
Symmetrical or centrosymmetric image, in preferred embodiment, the first figure is formed as border circular areas, and second graph is annulus
Domain is uniformly distributed in around the first figure, first coil Q1 disclosed in the embodiment of the present invention formed the first figure and
The area equation for the second graph that second coil Q2 is formed, the i.e. area equation of the area of the border circular areas and the annular region,
Specifically, meet relationship below,
S1=S2；
That is,
Wherein, S1、S2Respectively represent the area of the first figure and second graph, R1、R2And R3Respectively represent invented ladder
The three round radiuses of antenna from inside to outside are spent, i.e., each coil radius of above-mentioned antenna system is restricted by above-mentioned formula.
Antenna provided in an embodiment of the present invention is when receiving signal, the gradient day of first coil Q1 and the second coil Q2 composition
Line, while receiving passback radiofrequency signal from object detection area and the interference radiofrequency signal from the external world, wherein as penetrating
Nothing is presented in interference electromagnetic wave in the space of frequency interference, usually long-range radio broadcasting or the interference of power line radiation
Gradient characteristics, the i.e. distance of first coil Q1 and the second coil Q2 apart from interference source are far longer than the geometric dimension of coil itself,
Therefore the interference that a distant place is come can regard uniform distribution as in object detection area, and the first figure that first coil Q1 is formed
The area equation for the second graph that shape and the second coil Q2 are formed, according to faraday electromagnetic induction principle, the interference of induction is electronic
Gesture also has equal amplitude, since two coil windings of gradient antenna are contrary, the phase of interference signal on two coil
Position therefore just reverse phase, so the interference signal generated in first coil Q1 and the second coil Q2 can cancel out each other, and target
The passback radiofrequency signal that detectable substance generates is useful signal, has very strong gradient characteristics, in oppositely wound First Line
Counteracting and inhibition are not constituted in circle Q1 and the second coil Q2, on the contrary, according to the reciprocity law in electromagnetism, the quilt from object
It surveys signal and is superimposed enhancing in two coil, to increase signal strength while inhibiting interference, improve signal-to-noise ratio.Especially
It is that the second coil Q2 is uniformly looped around around first coil Q1, maximum possible ensure that first coil Q1 and the second coil
Q2 receives the consistency of interference signal, no matter whether target detection thing is symmetrically distributed in object detection area under antenna, Dou Nengyou
Effect enhancing signal reception and elimination interference.
Further, first coil Q1 and the second coil Q2 is the becket of benign conductor (such as copper conductor) or by least
A piece conducting wire coiling forms, and the number of turns after optimization depends on working frequency；The first figure and second that first coil Q1 is formed
The second graph that coil Q2 is formed is is axial symmetry or centrosymmetric image, and in preferred embodiment, the first figure is formed
For border circular areas, second graph is formed as annular section, is located on around the first figure, so that the first figure and second graph have
There is an identical symmetrical centre, first coil Q1 and the second coil Q2 shape are integrally formed into full symmetric antenna structure.Antenna
When receiving signal, the second coil Q2 has received the passback radiofrequency signal from detected material, first coil Q1 to the greatest extent
It is enhancing signal strength in phase together with the Signal averaging of the second coil Q2, to reach gradient receiving antenna most
Big signal-to-noise ratio.And since the second coil Q2 is generally evenly distributed in the periphery of first coil Q1, though target detection thing whether
It is symmetrically distributed in object detection area under antenna, the second coil Q2 can play the role of enhancing signal.
In principle, first coil Q1 and the second coil Q2 in the antenna in nuclear quadrupole resonance technology have transmitting and connect
Receive two states.As traditional resonance technique, antenna is first in emission state, in the excitation of electromagnetic wave measured object of transmitting
Target detection element to a upper state, then stop transmitting, antenna is transferred to reception state, receives and amplification useful signal.
Corresponding, having for antenna emits and receives both of which, is introduced below due to two different emission modes and is connect
The nuclear quadruple resonance detection system in two different embodiments constituted under receipts mode, and ignore the engineering people of this field
Center timing control unit known to member.
In first embodiment shown in Fig. 2, first coil Q1 and the second coil Q2 are connected in parallel, electrical pulse sequence power
Amplifier 200 is connected between first coil Q1 and the connects end altogether of the second coil Q2, meanwhile, signal receiving unit 300 also connects
Between first coil Q1 and the connects end altogether of the second coil Q2, first coil Q1 and the second coil Q2 are received and processed for signal
Received radiofrequency signal, and judge object detection area with the presence or absence of target detection thing with this.In practical applications, transmitting circuit
It is shared with receiving circuit, as shown in signal transmitter/receiver unit in Fig. 2, classic resonance is realized in the T-network of working frequency
Time division emission signal and reception signal, simplify circuit, and convenient for operation.
In shared transmitting circuit and receiving circuit, first coil Q1 and the second coil Q2 are parallel with capacitor C1, are formed
Parallel resonance receives circuit when transmitting and is isolated, and the power amplifier in instrument (such as common is surveyed by certain activation sequence
Measure the CPMG sequence of echo-signal) train pulse is sent to antenna, train pulse is converted to the sequence magnetic field of radio frequency by antenna, is sent out
It penetrates antenna and emits detection radiofrequency signal to object detection area, to the detection radiofrequency signal of object detection area transmitting predetermined time
Afterwards, motivate the quadrupole moment in measured object to a upper state, the quadrupole moment jump in upper state is restored to lower state, is restoring
During give off electromagnetic wave with excitation field same frequency, i.e. NQR resonance signal, be converted into the antenna institute of reception state
It receives, is then fed to the reception circuit amplification enhancing for being transferred to reception state from transmitting, is analyzed and determined for subsequent processing.Antenna
Into after reception pattern, first coil Q1 and the second coil Q2 constitute gradient receiving antenna, while receiving interference source and target inspection
Survey the radiofrequency signal that object generates.First coil Q1 and the received interference radiofrequency signal of the second coil Q2 can be in first coil Q1 and
It cancels out each other when the Signal averaging of two coil Q2 induction, signal receiving unit 300 is received only to be stimulated from target detection thing
The passback radiofrequency signal of generation, to eliminate interference.In practical applications, antenna can be changed with conventional method its impedance with
Reach 50 ohm of standard, facilitates matching criteria amplifier.
It as shown in Figure 3 and Figure 4, is the structural schematic diagram of nuclear quadrupole resonance detection system in second embodiment of the invention.
In this implementation, transmitting and reception are that tuning reaches resonance in working frequency respectively.Wherein in transmitting circuit, capacitor C2 with
First coil Q1 series resonance, Low ESR is presented in resonant tank when series resonance, is conducive to low voltage drive.Electrical pulse sequence function
Rate amplifier 200 is only connect with first coil Q1, for making first coil Q1 be generated and transmitted by detection radiofrequency signal, forms excitation
Train pulse magnetic field；Signal receiving unit 300 is for receiving and processing the received radio frequency letter of first coil Q1 and the second coil Q2
Number, and further analyze and determine that object detection area whether there is target detection thing.Specifically, first coil Q1 is serially connected with second
Capacitor, and the second capacitance series are in the signal transmitting circuit between electrical pulse sequence power amplifier 200 and first coil Q1,
When first coil Q1 emits pulse sequence signal, Low ESR is presented in transmitting antenna, therefore emission power can be using relatively
Low voltage, such as can be powered using automobile batteries, so that the detection system is suitable for the detection in the target detection thing in field
Work.
In receiving antenna circuit in the present embodiment, there are two types of implementations, and one is parallel resonances, as shown in figure 3,
It is series resonance that another kind, which is realized, as shown in Figure 4.Both implementations discussed in detail below.
In nuclear quadruple resonance detection system shown in Fig. 3, in reception pattern, transmit circuit disconnects antenna, and first
Coil Q1 and the second coil Q2 series connection, then shunt-resonant circuit is constituted with capacitor C3, output signal is through signal receiving unit 300
The preamplifier that isolation network is fed to the unit amplifies.In the transmission mode, receiving unit is in high impedance isolation
The shunt-resonant circuit that mode, capacitor C3 and antenna are constituted can couple part energy from transmitting circuit, in the second coil Q2
Induced emission electric current, then, the second coil Q2 also assist in transmitting excitation electromagnetic field.After transmitting, transmitting circuit is from dynamic circuit breaker
It opens, does not influence the parallel resonance formed after first coil Q1 and the second coil Q2 series connection with capacitor C3, which presents high
Impedance receives the signal that the measured object from target area is generated by transmitting excitation.Therefore, in such a mode, signal receives single
The input amplifier of member 300 must be high impedance.
In series resonance receiving circuit shown in Fig. 4, capacitor C3 and first coil Q1 and the second coil Q2 are in series
Antenna sets at series resonance, start to receive the signal from measured object at the end of transmitting.Due to series resonance, receiving circuit
Low ESR is presented, therefore, the input amplifier in signal receiving unit 300 must be Low ESR input.In this operating mode
Under, when transmitting antenna work, reception amplifier is isolated network is isolated with receiving circuit, and receiving circuit does not have induced electricity miscarriage
It is raw, therefore it is not involved in transmitting, transmitting antenna is equivalent to a simple annular emission antenna.
Fig. 5 show the lead-field that is, sensitivity profile curve of the invention antenna.The curve is based on unitary current
The vertical direction component (Bz) in the magnetic field for motivating a circle antenna to generate 0.5 meter of depths is distributed along planar radial.It is fixed according to reciprocity
Rule, the curve also reflect the spatial sensitivity profile of antenna.Wherein, the solid line in figure is that first coil Q1 drives in unitary current
Field distribution under dynamic, and dotted line is field pattern when first coil Q1 and the second coil Q2 constitutes gradient antenna.Obviously, this
Special gradient antenna structure improves the ability for receiving signal.
In second embodiment of the invention, i.e. Fig. 3 and nuclear quadruple resonance detection system shown in Fig. 4, in emission mode
When, first coil Q1 emits detection radiofrequency signal to object detection area as transmitting coil, at this point, transmitting antenna is First Line
The circular configuration antenna that Q1 is formed is enclosed, gives timing in the geometric dimension of antenna, simple circular antenna structure swashs with most deep
Encourage detection depth.This preferred embodiment circular configuration antenna is formed by emission mode compared to traditional gradient antenna and
Speech largely improves detection depth or detection range.It is corresponding, in this preferred embodiment, the of first coil Q2
The annular section that two figures are shaped generally as is located on around the first figure of first coil Q1, so that the first figure and second
Figure symmetrical centre having the same, first coil Q1 and the second coil Q2 shape are integrally formed into full symmetric day knot
Structure.In reception pattern, first coil Q1 and the second coil Q2 constitute gradient receiving antenna, while receiving radiofrequency signal, wherein
First coil Q1 and the second coil Q2 it is received interference radiofrequency signal can two coil Signal averaging together when mutually support
Disappear.And the second coil Q2 has received the passback radiofrequency signal from detected material to the greatest extent, to reach gradient reception
The maximum signal to noise ratio of antenna.And since the second coil Q2 is generally evenly distributed in the periphery of first coil Q1, no matter target is examined
Survey whether object is symmetrically distributed in object detection area under antenna, the second coil Q2 can play the role of enhancing signal.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of nuclear quadruple resonance detection antenna, which is characterized in that the antenna includes:
First coil, the first coil are formed with the first figure；
Second coil, second coil are formed with second graph；
The gradient antenna that the first coil and second coil are constituted, while receiving and being penetrated from target area signal and extraneous
Frequency interferes；
Wherein, the first coil and second coil are generally aligned in the same plane, the first coil and second coil
Coiling is contrary, and the second graph is uniformly distributed in around first figure, first figure and second figure
Shape area equation, first figure and second graph symmetrical centre having the same；First figure is formed as round
Shape, the second graph form annular, the area of border circular areas and the area equation of annular region.
2. nuclear quadruple resonance detection antenna as described in claim 1, which is characterized in that the first coil is becket
Or the single turn as made of at least one conducting wire coiling or multiturn antenna.
3. nuclear quadruple resonance detection antenna as described in claim 1, which is characterized in that second coil is becket
Or the single turn as made of at least one conducting wire coiling or multiturn antenna.
4. a kind of nuclear quadruple resonance detection system characterized by comprising
First coil, the first coil are formed with the first figure；
Second coil, second coil are formed with second graph；
The gradient antenna that the first coil and second coil are constituted, while receiving and being penetrated from target area signal and extraneous
Frequency interferes；
Wherein, the first coil and second coil are generally aligned in the same plane, the first coil and second coil
Coiling is contrary, and the second graph is uniformly distributed in around first figure, first figure and second figure
Shape area equation, first figure and second graph symmetrical centre having the same；First figure is formed as round
Shape, the second graph form annular, the area of border circular areas and the area equation of annular region；
Electrical pulse sequence power amplifier, the electrical pulse sequence power amplifier respectively with the first coil and described second
Coil connection, for making the first coil and second coil generate activation sequence pulsed magnetic field；
Signal receiving unit receives and processes the first coil and the received radiofrequency signal of the second coil for signal.
5. nuclear quadruple resonance detection system as claimed in claim 4, which is characterized in that the first coil and described second
Parallel connection of coil, the electrical pulse sequence power amplifier and the signal receiving unit are connected to the first coil and institute
Between the connects end altogether for stating the second coil.
6. nuclear quadruple resonance detection system as claimed in claim 4, which is characterized in that it further include first capacitor, described
One capacitor is in parallel with the first coil, the first capacitor and second coils from parallel connection of coils, the first capacitor, described first
Parallel resonance is collectively formed in coil and second coil.
7. a kind of nuclear quadruple resonance detection system characterized by comprising
First coil, the first coil are formed with the first figure；
Second coil, second coil are formed with second graph；
The gradient antenna that the first coil and second coil are constituted, while receiving and being penetrated from target area signal and extraneous
Frequency interferes；
Wherein, the first coil and second coil are generally aligned in the same plane, the first coil and second coil
Coiling is contrary, and the second graph is uniformly distributed in around first figure, first figure and second figure
Shape area equation, first figure and second graph symmetrical centre having the same；First figure is formed as round
Shape, the second graph form annular, the area of border circular areas and the area equation of annular region；
Electrical pulse sequence power amplifier, the electrical pulse sequence power amplifier is connect with the first coil, for making
It states first coil and generates activation sequence pulsed magnetic field；
Signal receiving unit receives and processes the first coil and the received radiofrequency signal of the second coil for signal.
8. nuclear quadruple resonance detection system as claimed in claim 7, which is characterized in that the first coil and described second
Coil is connected in series, and the first end of the first coil connect with the first end of second coil, and the of the first coil
Two ends connect the signal receiving unit with the second end of second coil.
9. nuclear quadruple resonance detection system as claimed in claim 7, which is characterized in that further include first capacitor and the second electricity
Hold, the first capacitor connects with the first coil, the first coil and second coil connect after with described second
Capacitor is connected in parallel.
10. nuclear quadruple resonance detection system as claimed in claim 7, which is characterized in that further include first capacitor and second
Capacitor, the first capacitor are connected with the first coil, second capacitor and the first coil and second line
Circle is connected in series.
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| CN101006609A (en) * | 2004-06-21 | 2007-07-25 | 路创电子公司 | Compact radio frequency transmitting and receiving antenna and control device employing same |
| CN101504381A (en) * | 2009-03-12 | 2009-08-12 | 中国原子能科学研究院 | Mail explosive detection equipment |
| CN204269802U (en) * | 2014-12-15 | 2015-04-15 | 安徽瑞迪太检测技术有限公司 | A kind of plane weak coupling antenna being applied to nuclear quadruple resonance detection system |
| CN105608484A (en) * | 2015-12-11 | 2016-05-25 | 深圳市卡的智能科技有限公司 | Rfid antenna and electronic label |
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| US9945917B2 (en) * | 2013-01-08 | 2018-04-17 | Lockheed Martin Corporation | Enhanced nuclear quadrupole resonance and ground penetrating radar using metamaterial antenna |
| US10636563B2 (en) * | 2015-08-07 | 2020-04-28 | Nucurrent, Inc. | Method of fabricating a single structure multi mode antenna for wireless power transmission using magnetic field coupling |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101006609A (en) * | 2004-06-21 | 2007-07-25 | 路创电子公司 | Compact radio frequency transmitting and receiving antenna and control device employing same |
| CN101504381A (en) * | 2009-03-12 | 2009-08-12 | 中国原子能科学研究院 | Mail explosive detection equipment |
| CN204269802U (en) * | 2014-12-15 | 2015-04-15 | 安徽瑞迪太检测技术有限公司 | A kind of plane weak coupling antenna being applied to nuclear quadruple resonance detection system |
| CN105608484A (en) * | 2015-12-11 | 2016-05-25 | 深圳市卡的智能科技有限公司 | Rfid antenna and electronic label |
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