CN101477069B - Detection apparatus based on high temperature superconducting quantum interfering device - Google Patents

Detection apparatus based on high temperature superconducting quantum interfering device Download PDF

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CN101477069B
CN101477069B CN200910076828A CN200910076828A CN101477069B CN 101477069 B CN101477069 B CN 101477069B CN 200910076828 A CN200910076828 A CN 200910076828A CN 200910076828 A CN200910076828 A CN 200910076828A CN 101477069 B CN101477069 B CN 101477069B
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high temperature
temperature superconducting
superconducting quantum
interfering device
quantum interfering
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CN101477069A (en
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阳运国
王延军
涂凯
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BEIJING MELST TECHNOLOGY DEVELOPMENT Co Ltd
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Abstract

The invention relates to a detection device based on high-temperature superconducting quantum interference device, which comprises a radio frequency generation device used for applying pulse to a sample, as well as a high-temperature superconducting quantum interference device receiving device used for receiving and acquiring nuclear quadrupole moment resonance signals fed back after the pulse is applied to the sample. As every solid substance has a chemical structure and every specific chemical substance is corresponding to one nuclear quadrupole resonance spectrum line, drugs, explosives and other contraband articles which can not be recognized by common X-ray security inspection machines can be detected through the detection device.

Description

Checkout equipment based on high temperature superconducting quantum interfering device
Technical field
The present invention relates to a kind of checkout equipment, relate in particular to a kind of nuclear quadrupole resonance (nuclear quadruple resonance, the NQR) checkout equipment of detecting hidden explosive and drugs based on high temperature superconducting quantum interfering device (SQUID).
Background technology
Have the place of confirming secure identity at needs such as airport securitys now, generally use X-ray to check article, this checkout equipment of X-ray exists can not offer an explanation out certain white powder, therefore in the safety check process, is difficult to detect the explosive and the drugs that are hidden in the luggage.And traditional faraday's inductance coil is surveyed and is difficult to explosive detection (TNT) because the intensity of resonant frequency of explosive low (0.7-0.9MHZ) and signal very a little less than.And existing metal detector can't be told a biscuit metal and real land mine.
The electric quadrupole moment (electric quadruplemoment) of nuclear makes the magnetic nuclear energy level divide with the interaction of circumnuclear electric-force gradient.When applying resonance radio frequency (RF) with excitation, nuclear quadrupole resonance (NQR) takes place, nuclear quadrupole resonance only to those such as 14N with 35The nuclear-spin quantum number I of Cl could take place greater than 1/2.Because quadrupolar interaction is responsive to the crystal structure of intramolecular four polar core positions and material, it can reflect the fine chemistry structure and the composition of material, each nuclear quadrupole resonance spectrum line all corresponding a specific chemical.Therefore, can utilize it to survey the chemical constitution of solid.
Therefore, can utilize it to come explosive and the drugs of detecting hidden in luggage, also can be used for locate (detect) amine, because explosive all contains the nitrogen element with in the drugs.The abundance of the isotope of stable N-14 in nature the inside reach 9***% and nuclear spin I=1 have the nuclear quadrupole resonance momentum.Explosive is nitrogenous abundant compound, and its nitrogenous weight percentage is 15-40%.The N-14 atomic nucleus is a spheroid shape, examines quadrupolar interaction again between N-14 nuclear in the nitrogenous molecule and the electronics around it, makes it produce a series of excited state.When the hundreds of kilocycle to the electromagnetic wave of several megacycles during through explosive, can be by its resonance absorption, explosive has become the electromagnetic emissive source of its characteristic frequency then, available detecting coil detects.
This has more advantage than the metal detector of using in the classic method, and superconducting quantum interference device is extraordinary magnetic field detectors, and its magnetic field resolution can reach 10- 15Web, and its response and do not rely on the frequency of signal.
Summary of the invention
The objective of the invention is for solve exist in the prior art can not detect materials such as explosive, drugs exactly, and a kind of detection system based on high temperature superconducting quantum interfering device is provided, to realize detecting drugs and explosive.
To achieve these goals, the invention provides a kind of checkout equipment, comprising based on high temperature superconducting quantum interfering device:
The radio frequency generating means is used for applying pulse to sample; And
The high temperature superconducting quantum interfering device receiving trap is used to receive and gather said pulse and applies the nuclear quadrupole resonance signal that is fed back behind the sample.
Further, said high temperature superconducting quantum interfering device receiving circuit comprises:
The metal resonant vibration converter is used to survey the NQR signal; With
High temperature superconducting quantum interfering device is used to gather the NQR signal that said metal resonant vibration converter is surveyed.
Further, said metal resonant vibration converter is made up of pick-up winding and the input coil that has tunable capacitor.
Further, the diameter of said pick-up winding is 9cm.
Further, the diameter of said input coil is 2.5cm.
Further, said metal resonant vibration converter also comprises the diode switch of intersection, is connected with input coil with said pick-up winding, is used to reduce the influence of exciting field to radio frequency SQUID.
Further, said high temperature superconducting quantum interfering device is a PLD deposition YBCO superconducting thin film on the STO substrate, forms quarter through photoetching and ion.
Further, said radio frequency generating means is made up of a coil and an electric capacity.
Further; Checkout equipment based on high temperature superconducting quantum interfering device also comprises: quadrupole resonance spectrometer locking detector is used for the said nuclear quadrupole resonance signal that said high temperature superconducting quantum interfering device receiving trap detects is amplified to form the nuclear quadrupole resonance spectrum line.
Therefore; Through this checkout equipment; Because each solid matter all has its chemical constitution, each specific chemical all corresponding a nuclear quadrupole resonance spectrum line, thereby can utilize this checkout equipment can detect the dangerous goods that common X-ray screening machines such as drugs and explosive can't be discerned.
Description of drawings
Fig. 1 is the block diagram that the present invention is based on the checkout equipment of high temperature superconducting quantum interfering device;
Fig. 2 is the circuit diagram of high temperature superconducting quantum interfering device receiving trap of the present invention.
Embodiment
Through accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description below.
The invention discloses a kind of prohibited items checkout equipment based on high temperature superconducting quantum interfering device, the high temperature superconducting quantum interfering device (rf SQUID) of this equipment utilization band metal converter substitutes traditional resonance inductive coil that has prime amplifier.And in order to reduce the influence of strong exciting field, the diode switch of intersection is inserted in the metal converter.
As shown in Figure 1; Block diagram for the checkout equipment that the present invention is based on high temperature superconducting quantum interfering device; This checkout equipment 1 comprises the radio frequency generating means 10 that applies pulse to sample 100; And high temperature superconducting quantum interfering device receiving trap 20, be used to receive that to have applied the feedback signal that postimpulse sample sent be the quadrupole resonance signal to form the nuclear quadrupole resonance spectrum line.This radio frequency generating means 10 is made up of a coil 101 and an electric capacity 102.High temperature superconducting quantum interfering device receiving trap 20 comprises metal converter 30; This metal converter is used for surveying and applies the NQR signal that postimpulse sample sends; And high temperature superconducting quantum interfering device 40; Be used for gathering the NQR signal that metal converter 30 is detected, form the nuclear quadrupole resonance spectrum line with convenient according to the NQR signal that detects like this.Promptly should also comprise based on the checkout equipment of high temperature superconducting quantum interfering device: quadrupole resonance spectrometer locking detector 50 is used for the said nuclear quadrupole resonance signal that said high temperature superconducting quantum interfering device receiving trap detects is amplified to form the nuclear quadrupole resonance spectrum line.
Owing at present be difficult to make the pick-up winding and the input coil of high-temperature superconductor, so high temperature superconducting quantum interfering device spare is difficult to detect the NQR signal, however the susceptibility that has a SQUID of normal metal resonant vibration converter improve, and can survey the NQR signal.Therefore, the present invention adopts the receiving circuit of the high temperature superconducting quantum interfering device (rf SQUID) of band metal converter to substitute traditional resonance inductive coil that has prime amplifier.Resonance normal metal converter 30 is made up of with the input coil 302 that has the diameter 2.5cm of tunable capacitor the pick-up winding 301 of the about 9cm of diameter; The about 9cm of the diameter of pick-up winding; Be its optimal way; And the diameter 2.5cm of input coil, be optimal way also, be not the diameter that is used to limit input coil of the present invention and pick-up winding.
In order to reduce the influence of strong exciting field, the diode switch 60 of intersection is inserted in the metal converter 30.And high temperature superconducting quantum interfering device of the present invention is preferably on the STO substrate PLD deposition YBCO superconducting thin film, forms quarter through photoetching and ion.
Referring to Fig. 2, the circuit diagram of high temperature superconducting quantum interfering device receiving trap of the present invention is described the circuit structure of this high temperature superconducting quantum interfering device receiving trap in detail.High-temperature superconductor exchanges quantum interfering device and is operated in the liquid nitrogen (shown in dotted line 200 among the figure), and high-temperature superconductor exchanges quantum interfering device receiving trap and process magnetic shielding (shown in dotted line 300 among the figure).By the transmission resonator that pick-up winding (L1) 301 and capacitor C 1 are formed, produce and intensify AC magnetic field, LM is the matched coil that transmits excitation energy, follows the distance of L1 can produce 50 ohm build-out resistor through regulating Lm.When switch SW 1 is closed, coil L1 also can be used as the collection coil when SW2 connected.By L1, C1, L2 and C2 form metal converter 30, are used for gathering the NRQ signal.Input coil (L2) 302 is placed in the magnetic shielding cylinder (shown in dotted line 300 among the figure) that liquid nitrogen (shown in dotted line 200 among the figure) is housed with radio frequency SQUID chip (being that high-temperature superconductor exchanges quantum interfering device).The pulse that sample is applied can be computerizedd control and produced, and carries out the collection and the processing of data by computing machine.Switch SW 1 in the diode switch 60 (SW1 and SW2, D1 and D2) that intersects and the effect of SW2 mainly are the influences to radio frequency SQUID of the exciting field of avoiding strong.Diode D1 and D2 are used for protection switch.When alternating-current pulse adds, switch SW 1 closure, switch SW 2 is broken off, and the signal of transmission is by short circuit, and therefore strong AC signal is not transferred to input coil (L2) 302.When alternating-current pulse terminating switch SW1 disconnection, switch SW 2 closures induce the NQR signal of generation to be detected and be delivered to input coil L2 by pick-up winding L1, are detected by high-temperature superconductor radio frequency SQUID again.Then, gathering the signal that comes by SQUID amplifies and can obtain the nuclear quadrupole resonance spectrum line through computing machine through extra pulse nuclear quadrupole resonance spectrometer locking detector.
For instance, when sample is positioned on this checkout equipment, apply pulse by 10 pairs of these samples of radio-frequency unit; And the pulse that is applied is controlled generation through computer, and this moment, sample had feedback signal, at this moment; The metal converter 30 of high temperature superconducting quantum interfering device receiving trap 20 can detect the NQR signal in the sample feedback signal through its pick-up winding 301; And input input coil 302, high temperature superconducting quantum interfering device 40 detects this NQR signal, promptly gathers this NQR signal; Through quadrupole resonance spectrometer locking detector this NQR signal is amplified, handle the nuclear quadrupole resonance spectrum line that obtains this sample through computer data.
The checkout equipment that has the high temperature superconducting quantum interfering device receiving circuit like this through this because each solid matter all has its chemical constitution, each specific chemical all corresponding a nuclear quadrupole resonance spectrum line.Therefore, can utilize this checkout equipment can detect the dangerous goods that common X-ray screening machines such as drugs and explosive can't be discerned.
It should be noted last that; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although the present invention is specified with reference to preferred embodiment; Those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention, and do not break away from the spirit and the scope of technical scheme of the present invention.

Claims (6)

1. checkout equipment based on high temperature superconducting quantum interfering device is characterized in that comprising:
The radio frequency generating means is used for applying pulse to sample; And
The high temperature superconducting quantum interfering device receiving trap is used to receive and gather said pulse and applies the nuclear quadrupole resonance signal that is fed back behind the sample;
Said high temperature superconducting quantum interfering device receiving trap comprises:
The metal resonant vibration converter is used to survey said nuclear quadrupole resonance signal;
High temperature superconducting quantum interfering device is used to gather the nuclear quadrupole resonance signal that said metal resonant vibration converter is surveyed;
Said metal resonant vibration converter is made up of pick-up winding and tunable capacitor, input coil;
Said metal resonant vibration converter also comprises switch SW 1, switch SW 2, two diodes; One end of said pick-up winding is connected with an end of said input coil through said tunable capacitor; The other end of said pick-up winding is connected with the other end of said input coil through switch SW 2; Switch SW 1 is connected in parallel on the two ends of said input coil through said tunable capacitor, and two diodes utmost point respectively are used for protection switch to opposite said switch SW 1 two ends that are parallel to; When switch SW 1 conducting and switch SW 2 are opened; The output of said pick-up winding is by short circuit, and is open-circuit condition between said pick-up winding and the said input coil, avoids strong exciting field to influence high temperature superconducting quantum interfering device.
2. the checkout equipment based on high temperature superconducting quantum interfering device according to claim 1, the diameter that it is characterized in that said pick-up winding is 9cm.
3. the checkout equipment based on high temperature superconducting quantum interfering device according to claim 1, the diameter that it is characterized in that said input coil is 2.5cm.
4. the checkout equipment based on high temperature superconducting quantum interfering device according to claim 1 is characterized in that said high temperature superconducting quantum interfering device is a PLD deposition YBCO superconducting thin film on the STO substrate, carves the high temperature superconducting quantum interfering device that forms through photoetching and ion.
5. the checkout equipment based on high temperature superconducting quantum interfering device according to claim 1 is characterized in that said radio frequency generating means is made up of a coil and an electric capacity.
6. according to each described checkout equipment in the claim 1 to 5 based on high temperature superconducting quantum interfering device; It is characterized in that also comprising: quadrupole resonance spectrum view locking detector is used for the said nuclear quadrupole resonance signal that said high temperature superconducting quantum interfering device receiving trap detects is amplified to form the nuclear quadrupole resonance spectrum line.
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JP5429469B2 (en) * 2009-09-07 2014-02-26 セイコーエプソン株式会社 Quantum interference device, atomic oscillator and magnetic sensor
CN103034820A (en) * 2011-09-29 2013-04-10 贵州久联民爆器材发展股份有限公司 Production authentication method for site mixed and loaded explosive truck and device thereof
CN114019762B (en) * 2021-10-27 2023-07-25 电子科技大学 Method for preparing nano array by laser evanescent wave near-field interference quantum lithography

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4777443A (en) * 1986-11-14 1988-10-11 Hitachi, Ltd. Inspection apparatus based on nuclear magnetic resonance
US5254950A (en) * 1991-09-13 1993-10-19 The Regents, University Of California DC superconducting quantum interference device usable in nuclear quadrupole resonance and zero field nuclear magnetic spectrometers
CN201352207Y (en) * 2009-01-22 2009-11-25 北京美尔斯通科技发展股份有限公司 Detection facility based on high-temperature superconducting quantum interference device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4777443A (en) * 1986-11-14 1988-10-11 Hitachi, Ltd. Inspection apparatus based on nuclear magnetic resonance
US5254950A (en) * 1991-09-13 1993-10-19 The Regents, University Of California DC superconducting quantum interference device usable in nuclear quadrupole resonance and zero field nuclear magnetic spectrometers
CN201352207Y (en) * 2009-01-22 2009-11-25 北京美尔斯通科技发展股份有限公司 Detection facility based on high-temperature superconducting quantum interference device

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