CN104502870A - Planer weak coupling antenna applied to nuclear quadrupole resonance detection system - Google Patents
Planer weak coupling antenna applied to nuclear quadrupole resonance detection system Download PDFInfo
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- CN104502870A CN104502870A CN201410779016.7A CN201410779016A CN104502870A CN 104502870 A CN104502870 A CN 104502870A CN 201410779016 A CN201410779016 A CN 201410779016A CN 104502870 A CN104502870 A CN 104502870A
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Abstract
The invention relates to a planer weak coupling antenna applied to a nuclear quadrupole resonance detection system. The planer weak coupling antenna comprises a transmitting antenna and a receiving antenna, which are sequentially arranged from outside to inside, wherein the transmitting antenna and the receiving antenna are arranged in the same plane; mutual inductance between the transmitting antenna and the receiving antenna is 0-10% of self-inductance of the receiving antenna; the receiving antenna comprises a first receiving antenna and a second receiving antenna; the second receiving antenna is connected with the first receiving antenna; the first receiving antenna and the second receiving antenna are respectively wound by leads; the lead winding direction of the first receiving antenna is opposite to that of the second receiving antenna. Through design of the receiving antenna and the transmitting antenna, the nuclear quadrupole resonance detection system disclosed by the invention can stably work without electromagnetic shielding; spatial stray electromagnetic waves can be effectively restrained, thus the signal-to-noise ratio of NQR (nuclear quadrupole resonance) is improved.
Description
Technical field
The present invention relates to NQR antenna technical field, be specifically related to a kind of plane weak coupling antenna being applied to nuclear quadruple resonance detection system.
Background technology
At present, metal detection technology, x-ray absorb or the harmless safety check technology such as scattering, neutron detection technology, terahertz detection technology is commonly used, but they all have limitation in various degree such as, and x-ray method can not recognition material; Neutron activation Detection Techniques can recognition element, but can not recognition material, and radiation protection is complicated; Terahertz measuring technique reliability is low, still can not reach practical level.
In the recent period, the method adopting nuclear quadrupole resonance technology (NQR) to carry out lossless detection explosive and drugs is taken seriously gradually.The principle of nuclear quadrupole resonance technology is as follows: spin is greater than the atomic nucleus such as the N14 of 1/2, and nuclear charge distribution departs from ball symmetry, so there is electric quadrupole moment; In non-zero gradient electric field, nuclear electric quadrupole causes nuclear-energy level splitting.Utilize electromagnetic action, the resonance of nuclear electric quadrupole moment can be realized.In most cases, electric quadrupole moment resonant frequency is in radio-frequency region.Therefore, can resonate with the electric quadrupole moment of radio-frequency technique excited nucleus.The electric-force gradient that electric quadrupole atomic nucleus is experienced in different molecules is also different, and its engery level cracking degree is also just different.When there is resonant transition, resonant frequency is also different.This characteristic makes NQR technology can recognition material.NQR resonance frequency extremely depends on the space structure of intramolecular atom electric field.Because the geometric ways of crystal accumulation is different, even if the identical atomic nucleus of chemical composition also can have different resonance peaks, so NQR material can analyze isomers.
In a word, adopt NQR technology to carry out safety check, Object Classification can be carried out accurately.But it is by force etc. not enough that NQR technology exists poor signal to noise and locality, so improving detecting distance is a very difficult problem.Detecting distance all has much relations with the size and shape of receiving antenna.Detecting distance is far away, and signal is more weak, and in order to improve sensitivity, the area of receiving antenna just needs to increase, and also wants the wire circle of guarantor unit's area simultaneously.Along with the increase of coil dimension, Q value also can increase, but the too high meeting of Q value causes two disadvantageous results.First is that coupling between emitting antenna and receiving antenna can increase along with the Q value of coil and increase, and the stability of system is proposed to the requirement of harshness; Second was that high q-factor can make antenna be subject to the impact of external environment larger.When Q value high to a certain extent time, the matching status of coil will environment sensitive to external world, and near human body or metal time, larger change can occur for tuning-points and the Q value of coil.Can antijamming capability be improved by the method for electromagnetic screen, but add equipment cost, and portable instrument can not be made human body, baggages are detected.
Summary of the invention
The object of the present invention is to provide a kind of plane weak coupling antenna, detecting distance when this antenna can improve safety check and antijamming capability.
For achieving the above object, present invention employs following technical scheme:
Be applied to a plane weak coupling antenna for nuclear quadruple resonance detection system, this plane weak coupling antenna comprises the emitting antenna and receiving antenna that set gradually from outside to inside.Because NQR signal locality is very strong, substantially the place that sensitive area is several cm above receiving antenna is detected, in order to design detection sensitive area large as far as possible, so the receiving coil that the present invention's design is as far as possible large, and in order to ensure to launch the intensity of magnetic field near receiving antenna, so to smaller size, coil system relatively simple for structure, generally can allow receiving antenna be positioned at the inside of emitting antenna; And for complexity, the coil that size is larger, likely can allow receiving antenna all be positioned at emitting antenna outside.
Described emitting antenna and receiving antenna are positioned at same plane, and the mutual inductance between emitting antenna and receiving antenna is 0 ~ 10% of the own self-induction of receiving antenna.Because band wavelength used herein is long, if emitting antenna and receiving antenna be not in same plane, emitting antenna and receiving antenna can shield signal each other, affect the sensitivity of signal.
The second receiving antenna that described receiving antenna comprises the first receiving antenna and is connected with the first receiving antenna, the first described receiving antenna and the second receiving antenna form by wire coiling, and the wire coiling direction of the first receiving antenna is contrary with the wire coiling direction of the second receiving antenna.
Further, the operating frequency range of this plane weak coupling antenna is 0.1 ~ 30MHz.
Further, described emitting antenna is becket or the coil by least one wire coiling.
Further, described receiving antenna is formed by least one wire coiling.
Further, the first described receiving antenna comprises at least one first receiving antenna unit;
The second described receiving antenna comprises at least one second receiving antenna unit;
The first described receiving antenna is connected with the second receiving antenna or is connected in parallel.
Further, described emitting antenna and receiving antenna form by the coiling of good conductor metal wire.
From above technical scheme, the present invention is by designing receiving antenna and emitting antenna, make mutual inductance therebetween close to 0, thus make to have nuclear quadruple resonance detection system of the present invention need not electromagnetic screen, just energy steady operation, and can effectively suppress space spurious electromagnetic waves, improve the signal to noise ratio (S/N ratio) of NQR signal.Because mutual inductance between emitting antenna of the present invention and receiving antenna is close to 0, therefore, the layout of emitting antenna and receiving antenna, shape, size can meet various design requirement, improve the detecting distance of NQR technology and arrange suitable Q value.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the NQR acquisition of signal illustraton of model of simple geometric structures;
Fig. 3 is the mutual inductance principle schematic diagram between two coils;
Fig. 4 is the structural representation of the plane weak coupling antenna in embodiment 2;
Fig. 5 is the structural representation of the plane weak coupling antenna in embodiment 3;
Fig. 6 is the structural representation of the plane weak coupling antenna in embodiment 4.
Wherein:
1, the first receiving antenna, the 2, second receiving antenna, 3, receiving antenna, 4, emitting antenna, 5, match circuit, 6, compensating coil.
Embodiment
If the self-induction of receiving antenna is L0, below in conjunction with accompanying drawing, the present invention will be further described:
A kind of plane weak coupling antenna being applied to nuclear quadruple resonance detection system as shown in Figure 1, this plane weak coupling antenna comprises the emitting antenna 4 and receiving antenna 3 that set gradually from outside to inside.Described emitting antenna 4 and receiving antenna 3 are positioned at same plane, and the mutual inductance between emitting antenna 4 and receiving antenna 3 is 0 ~ 10% of the own self-induction of receiving antenna 3.The second receiving antenna 2 that described receiving antenna 3 comprises the first receiving antenna 1 and is connected with the first receiving antenna 1, the first described receiving antenna 1 and the second receiving antenna 2 form by wire coiling, and the wire coiling direction of the first receiving antenna 1 is contrary with the wire coiling direction of the second receiving antenna 2.The operating frequency range of this plane weak coupling antenna is 0.1 ~ 30MHz.
The becket that emitting antenna 4 and receiving antenna 3 cut by good conductor body sheet metal or the coil by the coiling of at least one good conductor metal wire.Preferably, emitting antenna is zhou duicheng tuxing.The first described receiving antenna 1 comprises at least one first receiving antenna unit, and each the first receiving antenna unit is sequentially connected in series or is connected in parallel.The second described receiving antenna 2 comprises at least one second receiving antenna unit, and is sequentially connected in series or is connected in parallel between each the second receiving antenna unit.The first described receiving antenna 1 is connected with the second receiving antenna 2 or is connected in parallel.Mutual inductance when between the first receiving antenna 1 and emitting antenna 4 and the mutual inductance between the second receiving antenna 2 and emitting antenna 4 and be not equal to receiving antenna self self-induction 0 ~ 10% time, emitting antenna 4 is provided with a compensating coil 6, is 0 ~ 10% of the own self-induction of receiving antenna 3 for making the mutual inductance between emitting antenna 4 and receiving antenna 3.
The signal that receiving antenna 3 receives comprises three parts: Part I is the interference electromagnetic wave in space, and Part II is the NQR signal of target sample, and Part III comes from exciting of emitting antenna and noise signal.Space interference electromagnetic wave can be similar in smaller region regards uniform as, so the signal cancellation produced in the first receiving antenna and the second receiving antenna.Part II is useful signal, has very strong locality, does not form offset and suppress at the first receiving antenna of reverse coiling and the second receiving antenna.Part III, because being coupled between receiving antenna with emitting antenna is very weak, so receiving antenna has good inhibiting effect to the excitation signal of transmission antennas transmit and noise signal.
Principle of work of the present invention is:
The locality of NQR signal is very strong, and its intensity distance weakens rapidly.Sample can be approximated to be magnetic dipole, and for magnetic dipole radiation, the NQR signal amplitude that flat helical antenna receives nearby is
Wherein, ζ is filling rate, i.e. the ratio of sample occupied area in coil; A is wire circle and the ratio of area coil; μ
0for referring to permeability of vacuum; M (ν) macroscopic moment for being formed after sample excitation; ν is resonant frequency; Q and L is Q value and the inductance of coil respectively; R
0it is impedance after coupling.
Can see from formula (1), NQR signal intensity is relevant to the close back-haul degree of coil and the relative size of sample volume and area coil.
Consider that sample and coil have the situation of certain distance, the NQR acquisition of signal illustraton of model of simple geometric structures as shown in Figure 2.Assumes samples is right cylinder, and radius is r, is highly h, and its center distance coil is that D, D are much larger than sample size; Sample uniform magnetization, the magnetization is H (t); Coil radius is R, and coil plane 1 A distance hub of a spool is d, and area coil is S.The magnetic induction density that then sample induction magnetic moment is formed at A point is
The signal amplitude then responded in coil is
As can be seen from formula (2) and (3), signal intensity with
be inversely proportional to, when D is much smaller than R, with D inverse square, when D is much larger than R, with D cube inverse ratio; Signal intensity is relevant with R, when D is much larger than R, with R inverse ratio.So will detecting distance be increased, just need to increase coil dimension, also will keep the wire circle of unit area simultaneously.But along with the increase of coil dimension, Q value also can increase.
NQR detection system can have one or more antenna to transmit and receive, and transmission antennas transmit radio frequency electromagnetic carrys out four polar cores in excited sample, and receiving antenna is used for receiving NQR resonance signal.Emitting antenna and receiving antenna all adopt good conductor electric metal (gold, silver and bronze aluminium etc.) to make, and have high quality factor Q, Q value nearly 10
2left and right.But the too high meeting of Q value causes two consequences, first is that coupling between transmitting and receiving coil can increase along with the Q value of coil and increase, so propose the requirement of harshness to the stability of system; Second was that the antenna of high q-factor is larger by the impact of external environment.When Q value high to a certain extent time, coil matching status will environment be closely related to external world, near human body or metal time, all can there is larger change in tuning-points and the Q value of coil.So the Q value of coil must be in a suitable value.
As shown in Figure 3, induction electromotive force is produced in another coil that the magnetic field of the change excited during curent change in coil L1 can be closed at it.Same, the curent change in coil L2 also can produce induction electromotive force in coil L1.Be directly proportional to the electric current I 1 in coil L1 if the magnetic flux size that the magnetic field that coil L1 excites is formed in coil L2 is φ 12, φ 12: φ
12=M
12i
1, in like manner have φ
21=M
21i
2.Be easy to equally prove M
12=M
21=M, so definition M is coefficient of mutual inductance between coil L1 and coil L2, is used for the size of the coupling between measurement two coils.See that the structure of distance between M to coil and coil itself is relevant by definition.Can calculate two total inductances along wiring circle is L=L
1+ L
2+ 2M, the total inductance of two bucking coils is L=L
1+ L
2-2M.Just because of this, the present invention adopts reverse receiving coil to eliminate being coupled between emitting antenna with receiving antenna, suitably regulates the position of receiving coil each several part to carry out the Q value of regulating winding, makes it be in appropriate value.
Embodiment 1
In FIG, the first receiving antenna 1 comprises a first receiving antenna unit, and the second receiving antenna 2 comprises a second receiving antenna unit.As can be seen from Figure 1, two exits of emitting antenna 4 are respectively J and K, and this emitting antenna is zhou duicheng tuxing.The guiding coiling direction of the first receiving antenna 1 and the second receiving antenna 2 is contrary, and the exit of the wire of the exit of the wire of the outmost turns of the first receiving antenna 1 and the innermost circle of the second receiving antenna 2 is connected in series at M point.The exit of the wire of the innermost circle of the first receiving antenna 1 is connected to Q place, and the wire terminals of the outmost turns of the second receiving antenna 2 is connected to P place.4 exits J, K, P and Q access match circuit 5 respectively.After passing into electric current in emitting antenna 4 with receiving antenna 3, first receiving antenna 1 is contrary with the direction of current in the second receiving antenna 2, from the right-hand rule, and the mutual inductance M1 between the first receiving antenna 1 and emitting antenna 4, and the second mutual inductance M2 between receiving antenna 2 and emitting antenna 4, symbol is contrary.By designing the parameter of emitting antenna 4 and receiving antenna 3, make M1+M2=(0 ~ 10%) * L0.Like this, the mutual inductance between emitting antenna 4 and receiving antenna 3 just approximates 0, is weak coupling between emitting antenna 4 and receiving antenna 3.
Embodiment 2
In the diagram, the first receiving antenna 1 comprises multiple first receiving antenna unit, and the second receiving antenna 2 comprises multiple second receiving antenna unit.Be connected in series between each the first receiving antenna unit, form the first receiving antenna 1, and the wire coiling direction of each the first receiving antenna unit is identical.Be connected in series between each the second receiving antenna unit, form the second receiving antenna 2, and the wire coiling direction of each the second receiving antenna unit is identical.The wire coiling direction of the first receiving antenna 1 is contrary with the wire coiling direction of the second receiving antenna 2.First receiving antenna 1 and the second receiving antenna 2 are connected in series at M point.
Preferably, in Fig. 4, the quantity of the first receiving antenna unit and the second receiving antenna unit is set to 4.First receiving antenna 1 comprises 1a, 1b, 1c and 1d, and the second receiving antenna 2 comprises 2a, 2b, 2c and 2d.Draw one end from the innermost circle wire of 1a, start to turn to 1b from outside to inside; Then, draw one end from the innermost circle wire of 1b, start to turn to 1c from outside to inside; Then, draw one end from the innermost circle wire of 1c, start to turn to 1d from outside to inside; Finally, draw one end P from the innermost circle wire of 1d, receive match circuit.Draw one end from the innermost circle wire of 2a, start to turn to 2b from outside to inside; Then, draw one end from the innermost circle wire of 2b, start to turn to 2c from outside to inside; Then, draw one end from the innermost circle wire of 2c, start to turn to 2d from outside to inside; Finally, draw one end Q from the innermost circle wire of 2d, receive match circuit.The outmost turns wire terminals of 1a, is connected with the outmost turns wire terminals of 2a.After passing into electric current in emitting antenna 4 with receiving antenna 3, the first receiving antenna 1 is contrary with the direction of current in the second receiving antenna 2.If the mutual inductance M11 between 1a and emitting antenna 4, mutual inductance M12 between 1b and emitting antenna 4, mutual inductance M13 between 1c and emitting antenna 4, mutual inductance M14 between 1d and emitting antenna 4,2a and the mutual inductance M21 launched between sky 4 line, mutual inductance M22 between 2b and emitting antenna 4, the mutual inductance M23 between 2c and emitting antenna 4, the mutual inductance M24 between 2d and emitting antenna 4.Because emitting antenna 4 is contrary with the direction of current in receiving antenna 3, from the right-hand rule, M11, M12, M13 are identical with the symbol of M14, are positive number or are negative.M21, M22, M23 are identical with the symbol of M24, but contrary with the symbol of M11, M12, M13 and M14, are negative or are positive number.Owing to being symmetrically arranged between each unit of the first receiving antenna and each unit of the second receiving antenna, therefore, by designing the parameter of emitting antenna 4 and receiving antenna 3, M11+M12+M13+M14+M21+M22+M23+M24=(0 ~ 10%) * L0 can be made.Like this, the mutual inductance between emitting antenna 4 and receiving antenna 3 just approximates 0, is weak coupling between emitting antenna 4 and receiving antenna 3.
Embodiment 3
In Figure 5, compensating coil 6 is provided with in emitting antenna 4.First receiving antenna 1 comprises multiple first receiving antenna unit, and the second receiving antenna 2 comprises multiple second receiving antenna unit.Be connected in series between each the first receiving antenna unit, form the first receiving antenna 1, and the wire coiling direction of each the first receiving antenna unit is identical.Be connected in series between each the second receiving antenna unit, form the second receiving antenna 2, and the wire coiling direction of each the second receiving antenna unit is identical.The wire coiling direction of the first receiving antenna 1 is contrary with the wire coiling direction of the second receiving antenna 2.First receiving antenna 1 and the second receiving antenna 2 are connected in series at M point.
Preferably, in Fig. 5, the quantity of the first receiving antenna unit and the second receiving antenna unit is set to 2.First receiving antenna 1 comprises 3a and 3b, and the second receiving antenna 2 comprises 4a, 4b and 4c.Draw one end from the innermost circle wire of 3a, start to turn to 3b from outside to inside; Then, draw one end P from the innermost circle wire of 3b, receive match circuit.Draw one end from the innermost circle wire of 4a, start to turn to 4b from outside to inside; Then, draw one end from the innermost circle wire of 4b, start to turn to 4c from outside to inside; Finally, draw one end Q from the innermost circle wire of 4c, receive match circuit.The outmost turns wire terminals of 3a, is connected with the outmost turns wire terminals of 4a.After passing into electric current in emitting antenna 4 with receiving antenna 3, the first receiving antenna 1 is contrary with the direction of current in the second receiving antenna 2.If the mutual inductance M31 between 3a and emitting antenna 4, the mutual inductance M32 between 2b and emitting antenna 4, the mutual inductance M41 between 4a and emitting antenna 4, the mutual inductance M42 between 4b and emitting antenna 4, the mutual inductance M43 between 4c and emitting antenna 4.Because emitting antenna 4 is contrary with the direction of current in receiving antenna 3, from the right-hand rule, the symbol of M31 with M32 is identical, is positive number or is negative.M41, M42 are identical with the symbol of M43, but contrary with the symbol of M31, M32, are negative or are positive number.
Now, because each unit of the first receiving antenna 1 and each unit of the second receiving antenna 2 are not symmetrically arranged, if emitting antenna 4 does not arrange a compensating coil in centre, M31+M32+M41+M42+M43 ≠ (0 ~ 10%) * L0 can be made.Therefore, by arranging a compensating coil 6 in the middle of emitting antenna 4, and the parameter of emitting antenna 4 and receiving antenna 3 being designed, making M31+M32+M41+M42+M43=(0 ~ 10%) * L0.Like this, the mutual inductance between emitting antenna 5 and receiving antenna 3 just approximates 0, is weak coupling between emitting antenna 4 and receiving antenna 3.
Embodiment 4
First receiving antenna 1 and the second receiving antenna 2 are connected in parallel.In Fig. 6, make the first receiving antenna 1 comprise a first receiving antenna unit respectively, the second receiving antenna 2 comprises a second receiving antenna unit, and the first receiving antenna unit and the second receiving antenna unit are connected in parallel.The exit of the wire outmost turns of the first receiving antenna unit, is connected at M place with the exit of the wire outmost turns of the second receiving antenna unit, and as exit P; The exit of the wire innermost circle of the first receiving antenna unit, is connected with the exit of the wire innermost circle of the second receiving antenna unit, and as exit Q.After passing into electric current in emitting antenna 4 with receiving antenna 3, first receiving antenna 1 is contrary with the direction of current in the second receiving antenna 2, from the right-hand rule, and the mutual inductance M1 between the first receiving antenna 1 and emitting antenna 4, and the second mutual inductance M2 between receiving antenna 2 and emitting antenna 4, symbol is contrary.By designing the parameter of emitting antenna 4 and receiving antenna 3, make M1+M2=(0 ~ 10%) * L0.Like this, the mutual inductance between emitting antenna 4 and receiving antenna 3 just approximates 0, is weak coupling between emitting antenna 4 and receiving antenna 3.
Embodiment 5
First receiving antenna 1 comprises at least one first receiving antenna unit, and is connected in parallel between each the first receiving antenna unit.Second receiving antenna 2 comprises at least one second receiving antenna unit, and is connected in parallel between each the second receiving antenna unit.Direction of current in each the first receiving antenna unit is contrary with the circuit direction in each the second receiving antenna unit.If the mutual inductance between each the first receiving antenna unit and emitting antenna is respectively Mn1, Mn2 ... Mnn, mutual inductance between each the second receiving antenna unit and emitting antenna is respectively Mm1, Mm2 ... Mmm, then by designing the parameter of each the first receiving antenna unit and each the second antenna receiving element, make Mn1+Mn2+ ... + Mnn+Mm1+Mm2+ ... + Mmm=(0 ~ 10%) * L0.Like this, the mutual inductance between emitting antenna 4 and receiving antenna 3 just approximates 0, is weak coupling between emitting antenna 4 and receiving antenna 3.
Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present 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 (6)
1. be applied to a plane weak coupling antenna for nuclear quadruple resonance detection system, it is characterized in that: this plane weak coupling antenna comprises the emitting antenna (4) and receiving antenna (3) that set gradually from outside to inside;
Described emitting antenna (4) and receiving antenna (3) are positioned at same plane, and the mutual inductance between emitting antenna (4) and receiving antenna (3) is 0 ~ 10% of receiving antenna (3) own self-induction;
The second receiving antenna (2) that described receiving antenna (3) comprises the first receiving antenna (1) and is connected with the first receiving antenna (1), described the first receiving antenna (1) and the second receiving antenna (2) form by wire coiling, and the wire coiling direction of the first receiving antenna (1) is contrary with the wire coiling direction of the second receiving antenna (2).
2. a kind of plane weak coupling antenna being applied to nuclear quadruple resonance detection system according to claim 1, is characterized in that: the operating frequency range of this plane weak coupling antenna is 0.1 ~ 30MHz.
3. a kind of plane weak coupling antenna being applied to nuclear quadruple resonance detection system according to claim 1, is characterized in that: described emitting antenna (4) is becket or the coil by least one wire coiling.
4. a kind of plane weak coupling antenna being applied to nuclear quadruple resonance detection system according to claim 1, is characterized in that: described receiving antenna (3) is formed by least one wire coiling.
5. a kind of plane weak coupling antenna being applied to nuclear quadruple resonance detection system according to claim 1, is characterized in that: described the first receiving antenna (1) comprises at least one first receiving antenna unit;
Described the second receiving antenna (2) comprises at least one second receiving antenna unit;
Described the first receiving antenna (1) is connected with the second receiving antenna (2) or is connected in parallel.
6. a kind of plane weak coupling antenna being applied to nuclear quadruple resonance detection system according to claim 1, is characterized in that: described emitting antenna (4) and receiving antenna (3) form by the coiling of good conductor metal wire.
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| CN201410779016.7A CN104502870A (en) | 2014-12-15 | 2014-12-15 | Planer weak coupling antenna applied to nuclear quadrupole resonance detection system |
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|---|---|---|---|
| CN201410779016.7A CN104502870A (en) | 2014-12-15 | 2014-12-15 | Planer weak coupling antenna applied to nuclear quadrupole resonance detection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104991207A (en) * | 2015-07-30 | 2015-10-21 | 安徽瑞迪太检测技术有限公司 | RF coil system for nuclear quadrupole resonance detection |
| CN108960392A (en) * | 2017-05-27 | 2018-12-07 | 江峰 | A kind of double antenna RFID electronic label of counter magnetic flux |
| WO2019134160A1 (en) * | 2018-01-08 | 2019-07-11 | 曼森伯格（深圳）科技发展有限公司 | Nuclear quadrupole resonance detection system and antenna thereof |
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| 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 |
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| CN1323077A (en) * | 2000-05-10 | 2001-11-21 | 邓天权 | Antenna for mobile communication equipment |
| US20060033499A1 (en) * | 2002-06-13 | 2006-02-16 | Flexman John H | Receive system for high q antennas in nqr and a method of detecting substances |
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| WO2019134160A1 (en) * | 2018-01-08 | 2019-07-11 | 曼森伯格（深圳）科技发展有限公司 | Nuclear quadrupole resonance detection system and antenna thereof |
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