CN104280786A - Terahertz imaging passenger luggage rapid security inspection system and dangerous goods detection method thereof - Google Patents
Terahertz imaging passenger luggage rapid security inspection system and dangerous goods detection method thereof Download PDFInfo
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Abstract
The invention relates to a passenger luggage security inspection system, in particular to a terahertz imaging passenger luggage rapid security inspection system and a dangerous goods detection method of the terahertz imaging passenger luggage rapid security inspection system. Terahertz rays are focused on passenger luggage by controlling a two-dimensional transversely-moving platform through a computer, and are received by a detector after being reflected by passenger luggage and focused by a lens, terahertz signals are converted into voltage signals, and images are output through the computer after noise reduction and amplification are conducted on the voltage signals. The problems that during X-ray detection, hurts are great, formed images are not clear, luggage simultaneous detection signals interfere with one another, and a detection device is complex in structure, large in occupied area, low in detection efficiency and high in cost are solved. The terahertz imaging passenger luggage rapid security inspection system and the dangerous goods detection method are wide in application range, accurate in detection, small and exquisite in structure, and capable of simultaneously conducting security inspection on passenger luggage, and the potential safety hazards of public places are reduced on the premise of efficient security inspection.
Description
Technical field
The present invention relates to hand baggage safe examination system, specifically a kind of terahertz imaging hand baggage quick security check system and detection dangerous goods method thereof.
Background technology
Safe examination system is widely used in the place of the population agglomerations such as airport, subway station, railway station, bus station, market, public place of entertainment.Mostly tradition safe examination system is the separately inspection of passenger and luggage.Luggage security check adopts x-ray imaging technology, and the rays safety detection apparatus of use has detector gate, safety check X-ray machine etc., and passenger's safety check adopts hand-held metal detector usually.Staff utilizes rays safety detection apparatus to carry out safety detection to passenger and entrained luggage parcel respectively.
Terahertz general reference frequency is at 0.1 ~ 10THz(1THz=10-12Hz) electromagnetic wave in wave band, be in macroscopic classical theories to Bcs Theory, electronics to the transitional region of photonics, there is lower energy and higher penetrance.Because Terahertz does not have the ionization property of X ray, therefore can not damage material and human body, make it have larger application advantage compared with X ray.Imaging technique with other wave band is identical, and THz imaging technology is also utilize Terahertz radiation exposure measured object, obtains the amplitude of sample and the two-dimensional signal of phase place by the transmission of article or reflection, through process, analyzes the Terahertz image obtaining sample.
Terahertz imaging system is mainly divided into Pulse Imageing and continuous wave imaging.Compared with Pulse Imageing system, continuous wave imaging system still adopts point by point scanning method to carry out imaging, eliminates pumping-detection imaging device unlike continuous wave imaging system, and required number of elements is little, substantially reduces optics complicacy; Simultaneity factor is also without the need to time delay scanning, and image taking speed obtains and significantly promotes, and THz continuous wave imaging system has small-sized simple, fast and the advantage of relative moderate.
THz continuous wave imaging system has transmission-type and reflective two kinds of different imaging patterns, considers that hand baggage can be convenient by security check, makes safe examination system more simply small and exquisite simultaneously, should adopt reflective THz continuous wave imaging pattern.
Chinese invention patent CN101614725 A, disclose a kind of safety check door, comprise the drug/exploder detection subsystem be arranged in cabinet, radiomaterial detection subsystem and metal detection subsystem, wherein around described three kinds of detection subsystem, ELECTROMAGNETIC RADIATION SHIELDING is set respectively, to make drug/exploder detection subsystem, mutually isolated between radiomaterial detection subsystem and metal detection subsystem;
Chinese invention patent CN102095611A, disclose a kind of detection drugs, the pedestrian safety check door of explosive and metal, comprise metal detection subsystem and drug/exploder detection subsystem, two sidewalls of the inspection passage of described drug/exploder detection subsystem are provided with multiple nozzle placement layer, each nozzle placement layer comprises multiple nozzle, multiple nozzles on described each nozzle placement layer point to the center of the nozzle placement layer at its place, the station, formulation position that checked pedestrian enters the test space is good, system starts jet, blow afloat, collect gas, then drugs are delivered to, explosive detector detects, and provide analysis result by System control computer,
Although CN101614725A and CN102095611A all can detect drugs, explosive and metal simultaneously, but what adopt is different sub-systems separately, although there is spacer assembly, still likely occur that 2 subsystem signals interfere with each other, cause false alarm phenomenon, and this device structure is complicated, cost is high;
Chinese invention patent CN103149598A discloses a kind of visual human body security check device, by system control module, voice prompting device, access control part, terahertz wave detector, video and information acquisition part, operation and display terminal composition, this device is under the control of system control module and application of installation operating system, sent by voice prompting device and check instruction and prompting, terahertz wave detector receives the THz wave of reflection body surface feature, video and information acquisition part gather tested person's video image and identity information, terminal processes is made through behaviour and display, generate visual tested person's body surface Terahertz image, comprehensively the above-mentioned information collected makes safe judgement.This device is only for detecting the rays safety detection apparatus of visitor.
Mainly there is following drawback in conventional inspection mode:
1) safety check technology uses X ray radioactive source, because X ray radioactivity is strong, great injury is had to human body, even make cell generation canceration, when therefore using this system, people and luggage must separately be checked, detecting step is loaded down with trivial details makes passenger increase in the Mag & Bag Area hold-up time, easily causes block up in the volume of the flow of passengers large period;
2) what x-ray imaging technology was formed is not fogging clear, can not judge very accurately dangerous things, needs if desired to unpack to confirm further, because of the customs clearance efficiency this reduced;
3) drugs, explosive and metal device can be detected at present simultaneously, what adopt is different sub-systems separately, although there is spacer assembly, still likely appearance 2 or multiple subsystem signals interfere with each other, cause false alarm phenomenon, and this device structure is complicated, cost is high, adds potential safety hazard;
4) in order to avoid X ray works the mischief, traditional rays safety detection apparatus is bulky, causes floor area larger.
Therefore, those skilled in the art are necessary to develop a kind of novel hand baggage safe examination system simultaneously, under the prerequisite ensured personal safety, improve the recall rate to dangerous goods, shorten the safety check time, improve safety check efficiency, guarantee the human safety issues of public arena.
Summary of the invention
Object of the present invention is exactly the deficiency in order to overcome existing safety check technology, provide a kind of terahertz imaging hand baggage quick security check system and detect the method for dangerous goods, injury when X ray detects is large to solve, not fogging clear, the luggage and articles detection signal interference simultaneously that formed, the complicated area occupied of assay device structures is large, detection efficiency is low, cost is high problem; In order to solve the problems of the technologies described above, the present invention is solved by following technical proposals:
A kind of terahertz imaging hand baggage quick security check system, comprises Terahertz unit, alarm, computing machine, two-dimension translational platform, electromagnetic horn; Described Terahertz unit comprises transmitter, conduction optical element, concentrating element and detector, and Terahertz cell imaging is reflective continuous wave terahertz imaging; Described transmitter, is made up of Gunn diode and frequency multiplier, for the radiation source of terahertz imaging system; Described electromagnetic horn, for coupled transfer THz wave; Described conduction optical element, is made up of, for conducting light beam parabolic reflecting mirror, chopper and aluminum plane mirror; Described concentrating element, is made up of, for focused beam tygon Fresnel Lenses and polyethylene lens; Described detector is Terahertz ray surface array detector; Described two-dimension translational platform, for placement and the translation of safety check thing; Described control computer, for the Terahertz oscillation frequency of the signal storing dangerous article that accept detector; Described alarm, is placed between Terahertz unit and computing machine, when the Terahertz oscillation frequency of dangerous goods being detected and alarm.
As preferably, the detector of described Terahertz unit inside is one group of detector.
As preferably, described detector adopts plane electrode schottky diode.
The method of above-mentioned terahertz imaging hand baggage quick security check systems axiol-ogy dangerous goods, its special feature is: the Terahertz ray focusing transmitter of Terahertz unit inside being sent by computing machine control two-dimension translational platform is on hand baggage, Terahertz ray is received by the detector of Terahertz unit inside after hand baggage reflection, lens focus, terahertz signal is become voltage signal, by computer output image after noise reduction amplifies; Described Terahertz cell operation step is as follows:
S1: it is the electromagnetic wave of 100GHz that Gunn diode produces frequency, and through frequency multiplier frequency multiplication, output frequency becomes 200GHz, these two parts composition transmitter, as the radiation source of terahertz imaging system;
S2: electromagnetic horn coupled transfer THz wave, makes output terahertz emission have good directivity;
S3: passed chopper by the THz wave that parabolic reflecting mirror reflects, then focused on by tygon Fresnel Lenses, reflex to sample surfaces through aluminum plane mirror;
S4: sample is placed on a two-dimension translational platform, controls two-dimension translational platform by computing machine and ensures the focusing of THz wave at sample surfaces;
S5: the THz wave through sample or metal base plate reflection is focused on by a polyethylene lens, passes on detector;
S6: terahertz signal changes voltage signal into through detector, exports after then being amplified by the amplifier of low noise, forms image by after computer acquisition.
Compared with prior art, the beneficial effect that the present invention brings is:
(1) the present invention adopt reflective continuous wave terahertz imaging, compact structure, required number of elements few, safety check can be carried out to passenger and luggage simultaneously, because Terahertz ray does not have the ionization property of X ray, therefore can not damage article and human body;
(2) compared with traditional safe examination system, the present invention scans without the need to time delay, image taking speed is fast, substantially reduce the safety check time, improves safety check efficiency.For traditional safe examination system, passenger is put into X-ray screening machine again by detector gate by unloading luggage parcel during Mag & Bag Area, and then safety inspector uses metal detector to carry out whole body detection, and luggage is detected by X-ray screening machine simultaneously.On volume of the flow of passengers peak, by Mag & Bag Area about 1 ~ 3 minute/person-time.The Terahertz ray surface array detector that the present invention adopts can real time imagery, and passenger only need be about 15 seconds/person-time by the time of safe examination system.
(3) the present invention adopts Terahertz ray to have penetrability and the strong reflection characteristic to metal material, and the high frequency characteristics of Terahertz makes, and the resolution of imaging is higher even can realize three-dimensional imaging, therefore, accurately can find to be hidden in combustible and explosive articles, hazardous chemical, radioactive substance, the metal in clothing, footwear or in luggage case, efficiently solve the unsharp problem of x-ray imaging.
(4) compared with traditional passenger's rays safety detection apparatus, Terahertz, except detecting metal object, can also realize differentiating the detection of nonmetal, polar material, non-polar material, thus enable the present invention carry out imaging to nearly all dangerous goods.
(5) the concussion frequency of the present invention to different article is distinguished, and can realize setting up a database, be equivalent to " fingerprint base " of dangerous goods, reporting to the police when running into fixing oscillation frequency; Usable range of the present invention is wide, detection is accurate, greatly can reduce the potential safety hazard of public place.
(6) the present invention can be widely used in the safe examination system of airport, subway station, railway station, bus station, market, public place of entertainment.
(7) the present invention can detect combustible and explosive articles, hazardous chemical, radioactive substance, the metal entrained by hand baggage, and combustible and explosive articles comprises fireworks and firecrackers; Hazardous chemical comprises pressure gas and liquid gas, flammable liquid, inflammable solid, spontaneously combustible and dangerous when wet, oxygenant and organic peroxide, Poison and corrosives; Radioactive substance comprises metallic uranium, nitre acid thorium; Metal comprises controlled knife, automatic rifle, tommy gun, sniping gun, pistol, machine gun, grenade launcher.
Accompanying drawing explanation
The fundamental diagram of Fig. 1 Terahertz unit of the present invention;
Fig. 2 safe examination system schematic diagram of the present invention;
In figure: 1-Gunn diode; 2-frequency multiplier; 3-transmitter; 4-electromagnetic horn; 5-parabolic reflecting mirror; 6-chopper; 7-tygon Fresnel Lenses; 8-aluminum plane mirror; 9-dangerous goods; 10-two-dimension translational platform; 11-polyethylene lens; 12-detector; 13-Terahertz unit; 14-computing machine; 15-alarm.
Embodiment
The present invention is further elaborated for the embodiment provided below in conjunction with Fig. 1 and Fig. 2, but embodiment does not form any restriction to the present invention.
See Fig. 1, Fig. 2, the terahertz imaging hand baggage quick security check system described in the present embodiment, comprises Terahertz unit 13, alarm 15, computing machine 14, two-dimension translational platform 10, electromagnetic horn 4; Described Terahertz unit 13 comprises transmitter 3, conduction optical element, concentrating element and detector; Described transmitter 3, is made up of, for the radiation source of terahertz imaging system Gunn diode 1 and frequency multiplier 2; Described electromagnetic horn 4, for coupled transfer THz wave; Described conduction optical element, is made up of, for conducting light beam parabolic reflecting mirror 5, chopper 6 and aluminum plane mirror 8; Described concentrating element, is made up of, for focused beam tygon Fresnel Lenses 7 and polyethylene lens 11; Described two-dimension translational platform 10, for placement and the translation of safety check thing; Described computing machine 14, for the Terahertz oscillation frequency of the signal storing dangerous article that accept detector 12; Described alarm 15, is placed between Terahertz unit 13 and computing machine 14, when the Terahertz oscillation frequency of dangerous goods being detected and alarm.
The imaging of described Terahertz unit 13 is reflective continuous wave terahertz imaging, and compact structure is succinct, and image taking speed is fast, non-time delay.
The detector 12 of described Terahertz unit 13 inside is one group of detector 12, ensures all THz wave receiving hand baggage reflection.
Described detector 12 adopts plane electrode schottky diode, fast response time, facilitates high speed imaging.
During work, first open various parts power supply, controlled the position of two-dimension translational platform 10 by computing machine 14, the Terahertz wave energy that transmitter 3 is launched focuses on the axis of two-dimension translational platform 10 place.When hand baggage accepts safety check on two-dimension translational platform 10, send THz wave by Terahertz unit 13, THz wave, through hand baggage surface reflection, is finally received detection by the detector 12 of Terahertz unit 13.Terahertz signal is become voltage signal by detector 12, by computing machine 14 output image after noise reduction amplifies.The Terahertz concussion frequency of typing dangerous goods in computing machine 14, and between Terahertz unit 13 and computing machine 14, be connected to alarm 15, when detecting that dangerous goods alarm device 15 can send warning reminding security staff.
The principle of work of described Terahertz unit as shown in Figure 1.Its principle of work is:
Gunn diode 1 produces the electromagnetic wave that frequency is 100GHz, and through frequency multiplier 2 frequency multiplication, output frequency becomes 200GHz.
Electromagnetic horn 4 coupled transfer THz wave, makes output terahertz emission have good directivity.Passed chopper 6 by the THz wave that parabolic reflecting mirror 5 reflects, then focused on by tygon Fresnel Lenses 7, reflex to dangerous material 9 surface through aluminum plane mirror 8.
Dangerous goods 9 are placed on a two-dimension translational platform 10, control two-dimension translational platform 10 ensure the focusing of THz wave on dangerous goods 9 surface by computing machine 14.
The THz wave reflected through dangerous goods 9 is focused on by a polyethylene lens 11, passes on detector 12.
Terahertz signal changes voltage signal into through detector 12, exports, form image after being gathered by computing machine 14 after then being amplified by the amplifier of low noise.
Those skilled in the art do not depart from essence of the present invention and spirit, various deformation scheme can be had to realize the present invention, the foregoing is only the better feasible embodiment of the present invention, not thereby interest field of the present invention is limited to, the equivalent structure change that all utilizations instructions of the present invention and accompanying drawing content are done, is all contained within interest field of the present invention.
Claims (4)
1. a terahertz imaging hand baggage quick security check system, comprises Terahertz unit, alarm, computing machine, two-dimension translational platform, electromagnetic horn; It is characterized in that: described Terahertz unit comprises transmitter, conduction optical element, concentrating element and detector, and Terahertz cell imaging is reflective continuous wave terahertz imaging; Described transmitter, is made up of Gunn diode and frequency multiplier, for the radiation source of terahertz imaging system; Described electromagnetic horn, for coupled transfer THz wave; Described conduction optical element, is made up of, for conducting light beam parabolic reflecting mirror, chopper and aluminum plane mirror; Described concentrating element, is made up of, for focused beam tygon Fresnel Lenses and polyethylene lens; Described detector is Terahertz ray surface array detector; Described two-dimension translational platform, for placement and the translation of safety check thing; Described control computer, for the Terahertz oscillation frequency of the signal storing dangerous article that accept detector; Described alarm, is placed between Terahertz unit and computing machine, when the Terahertz oscillation frequency of dangerous goods being detected and alarm.
2. terahertz imaging hand baggage quick security check system according to claim 1, is characterized in that: the detector of described Terahertz unit inside is one group of detector.
3. terahertz imaging hand baggage quick security check system according to claim 1 and 2, is characterized in that: described detector adopts plane electrode schottky diode.
4. the method for terahertz imaging hand baggage quick security check systems axiol-ogy dangerous goods as claimed in claim 1, it is characterized in that: the Terahertz ray focusing transmitter of Terahertz unit inside being sent by computing machine control two-dimension translational platform is on hand baggage, Terahertz ray is received by the detector of Terahertz unit inside after hand baggage reflection, lens focus, terahertz signal is become voltage signal, by computer output image after noise reduction amplifies; Described Terahertz cell operation step is as follows:
S1: it is the electromagnetic wave of 100GHz that Gunn diode produces frequency, and through frequency multiplier frequency multiplication, output frequency becomes 200GHz;
These two parts composition transmitter, as the radiation source of terahertz imaging system;
S2: electromagnetic horn coupled transfer THz wave, makes output terahertz emission have good directivity;
S3: passed chopper by the THz wave that parabolic reflecting mirror reflects, then focused on by tygon Fresnel Lenses, reflex to sample surfaces through aluminum plane mirror;
S4: sample is placed on a two-dimension translational platform, controls two-dimension translational platform by computing machine and ensures the focusing of THz wave at sample surfaces;
S5: the THz wave through sample or metal base plate reflection is focused on by a polyethylene lens, passes on detector;
S6: terahertz signal changes voltage signal into through detector, exports after then being amplified by the amplifier of low noise, forms image by after computer acquisition.
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| CN104792744B (en) * | 2015-04-17 | 2017-07-11 | 上海理工大学 | THz wave detection means |
| WO2016197278A1 (en) * | 2015-06-12 | 2016-12-15 | 上海理工大学 | Active terahertz human body security system device and adjustment method |
| CN104992491A (en) * | 2015-07-10 | 2015-10-21 | 苏州朗捷通智能科技有限公司 | Intelligent safety inspection control system |
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| CN106596461A (en) * | 2016-12-26 | 2017-04-26 | 安徽旺家源门业有限公司 | Hazardous chemical gas detection terahertz safety door and detection method |
| CN107193051A (en) * | 2017-07-07 | 2017-09-22 | 深圳翠博微系统有限公司 | A kind of Terahertz conveyer belt detecting system |
| CN107728223A (en) * | 2017-09-13 | 2018-02-23 | 太原理工大学 | A kind of steel rope core conveying belt joint twitches online test method |
| CN108182405A (en) * | 2017-12-28 | 2018-06-19 | 广州超越数码科技有限公司 | A kind of subway safe examination system |
| CN108557305A (en) * | 2018-04-04 | 2018-09-21 | 北京联合大学 | A kind of anti-miscarrying can alarm dustbin |
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| CN109728446A (en) * | 2018-12-28 | 2019-05-07 | 浙江大学 | The active super surface dielectric lens antenna with holes of two-dimensional scanning varactor |
| CN110060448A (en) * | 2019-04-28 | 2019-07-26 | 软通智慧科技有限公司 | Reminding method, device, equipment and storage medium |
| CN110146464A (en) * | 2019-05-30 | 2019-08-20 | 上海理工大学 | A kind of crawler belt safe examination system based on terahertz imaging |
| CN112269215A (en) * | 2020-11-05 | 2021-01-26 | 上海亨临光电科技有限公司 | Intelligent security check system and method based on passive terahertz security check instrument |
| CN114966918A (en) * | 2022-07-25 | 2022-08-30 | 允沃能源科学研究(江苏)有限公司 | Fresnel lens and imaging system with same |
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