CN102914555B - Unisource X-ray transmission and compton scattering security check device in L-shaped structure - Google Patents
Unisource X-ray transmission and compton scattering security check device in L-shaped structure Download PDFInfo
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- CN102914555B CN102914555B CN201210467904.6A CN201210467904A CN102914555B CN 102914555 B CN102914555 B CN 102914555B CN 201210467904 A CN201210467904 A CN 201210467904A CN 102914555 B CN102914555 B CN 102914555B
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Abstract
Provided is a unisource X-ray transmission and compton scattering security check device in an L-shaped structure. An X-ray source is shared for transmission measurement and compton scattering measurement. An industrial personal computer is shared for measurement control. A thick radiation shield layer is arranged between a compton scattering detector and an L-shaped transmission detector. A transmission measuring and imaging geometry structure is formed by the X-ray source and an L-shaped structure transmission detector array. A back scattering measuring and imaging geometry structure is formed by a back scattering parallel photon beam and a compton back scattering detector array, wherein the back scattering parallel photon beam passes through a rear collimator and is ejected after a sector-shaped transmission photon beam passes through a to-be-measured object. A front scattering measuring and imaging geometry structure is formed by a front scattering parallel photon beam and a compton front scattering detector array, wherein the front scattering parallel photon beam passes through the rear collimator and is ejected after the sector-shaped transmission photon beam passes through the to-be-measured object. The unisource X-ray transmission and compton scattering security check device is cheap in price, quick in detection speed and high in sensitivity, can be used for simultaneously detecting different types of prohibited goods such as metal weapons, explosives and narcotics, and is suitable for important large security check occasions.
Description
One, technical field
Patent of the present invention relates to a kind of X ray safe examination system, specifically a kind of single source X-ray transmission of the L shape structure used on luggage security inspection machine and Compton scattering safety check apparatus and detection method thereof.
Two, background technology
1. X-ray transmission method:
Generally adopt in this way both at home and abroad, because material is to the absorption of X ray, when X ray is absorbed through having part energy after checking matter, different types of material is different to the receptivity of X ray, and the energy when X-ray beam through different materials arrives detector is also different.Through process, the energy size that detector receives shows with grayscale image, and this method can only check out metal weapon, cutter etc., has larger limitation
2. dual-energy x-ray transmission method:
Recent domestic adopts dual-energy x-ray transmission method, and the precision of the precision resolution effective atomic number of dual-energy x-ray detection method identification material is weighed.Security Inspection Equipments for important departments such as airport, customs, railways is mostly dual energy, line sweep, transmission-type x-ray inspection equipment, this kind equipment can obtain low energy and the high energy information of checking matter simultaneously, and calculates the effective atomic number Z of inspected object component according to these two kinds of information
effinformation, thus the classification realized inspected object and identification, can separate inorganics from organism, as isolated by the inorganicss such as glass common in luggage.But to Z
effclose plastics, fabric, explosive and the drugs of value cannot be differentiated, and solve with backward scattering.
3. X ray backward scattering method: transmission, absorption and scattering three kinds of situations can occur for X ray and matter interaction, X ray both domestic and external backward scattering (CBS) method uses chopper wheel and Flying-spot technology exactly, Chenging with transmission photons direction≤90
0direction backscatter detector array measurement is by the backward scattering photon that tested article penetrate.The effective atomic number Z of backscatter signal and tested article
effrelevant, organism, explosive, drugs etc. can be differentiated with the display of backscatter images gray scale.And this X ray backward scattering safety check apparatus Detection results also has not enough, the most serious accident is: during U.S.'s Atlanta Olympic Games, do not check out explosive with this backward scattering safety check apparatus and cause on-the-spot blast.The recent research and production of the U.S. goes out backward scattering human body checkout facility, and only 78 base fields of the U.S. in 2010 will install 450, its complex structure, and detection speed is comparatively slow, expensive, is difficult to apply in developing country.
4. Computed tomography (CT) method of X ray: the method is suitable for large-scale luggage parcel, the CTX9000 baggage screening system that AM General intelligence scientific & technical corporation produces, L-3CSDS company of the U.S. produce 3DX Explosives Detection System, its complex structure.Price is very expensive, is more difficult to apply in developing country.
5. the detection method that combines with Compton scattering (TR-CBS) of X transmission of radiation:
Sichuan University cooperates first to be developed at home gamma-rays transmission and to combine with backward scattering desk-top screening machine with units concerned, due to radiological safety protection and the keeping problem of gamma ray radiator, the degree of recognition of the public to this screening machine is poor, makes it be difficult to apply.
Three, summary of the invention
The object of the invention is for above-mentioned the deficiencies in the prior art, provide a kind of can simultaneously comprehensively, extensively detect single source X-ray transmission and the Compton scattering safety check apparatus of metal knife, weapon and drugs, explosive contraband goods in luggage.This safety check apparatus is more suitable for China's actual conditions, be easier to apply in developing country, detection speed is faster, Detection results is better, price is more cheap.
The object of the invention is to reach like this: a kind of single source X-ray transmission of L shape structure and Compton scattering safety check apparatus, be arranged on luggage security inspection machine.Luggage security inspection machine comprises frame, base, left and right sidewall, lamina tecti, security check passage, travelling belt machine.It is characterized in that: the x-ray source and the L shape transmission detector array that adopt asymmetric wide segment angle, scattering before transmission measurement and Compton, backward scattering are measured and are shared an x-ray source, whole Measurement & Control shares an industrial computer.Before compton backscattering detector array, Compton, between scattering detector array and L shape transmission detector array, thicker radiation shield is set.Industrial computer is arranged on a proceeds posterolateral of device pedestal.
The x-ray source of asymmetric wide segment angle and fan-shaped front collimating apparatus thereof be arranged on the outer side of security check passage centre and higher than travelling belt, L shape transmission detector array and thereafter collimating apparatus to be arranged on directly over security check passage and the upper end, the left and right sides of passage, and L shape transmission detector array and x-ray source form the geometry structure of transmission measurement and imaging through the asymmetric fan-shaped transmission photons bundle of front collimating apparatus.Compton backscattering detector array is arranged on below channel conveyor, and compton backscattering detector array and the parallel photon beam of compton backscattering that tested article penetrate form compton backscattering and measure and the geometry structure of imaging.Be arranged on directly over security check passage with scattering detector array before the Compton that compton backscattering detector array is parallel up and down, before Compton, scattering detector array and the parallel photon beam of scattering before the Compton that tested article penetrate form the geometry structure of scatterometry and imaging before Compton.
Industrial computer is arranged on the rear, left side of device pedestal.
The height of L shape transmission detector array and width, compton backscattering change according to actual needs from the length of front scattering detector array and different.
X-ray source employing volume is little, stability is high, the 200W X-ray production apparatus of fan-shaped angular width.
Before compton backscattering detector array and Compton, scattering detector array adopts silicon photoelectric diode and cesium iodide scintillation crystal to make, and has international standard interface; L shape transmission detector array is the detector assembly adopting silicon photoelectric diode and cesium iodide scintillation crystal to make, and has international standard interface.
Compton scattering measurement data adopts biography system Shi You No. 16 low-noise preamplifier, main amplifier, multichannel analog signals acquisition module, A-D converter, programmable data processing circuit composition, arranges USB interface and exports; Transmission measurement adopts 64 circuit-switched data to adopt biography system, arranges USB interface and exports.
Advantage of the present invention is:
Single source safety check apparatus of 1.L shape structure makes full use of the feature of X-ray transmission (TR – Transmission Scanning) and Compton scattering (CS – Compton Scatter Scanning), X-ray transmission (TR) scanning technique is utilized to obtain shape size, the density x thickness information of various article in luggage parcel, be shown as the gray scale of different brackets, record transmission image and detect the contraband goodss such as metal weapon, cutter clearly thus; X ray compton backscattering (CBS – Compton Backscatter Scanning) and front scattering (CFS – Compton Fontscatter Scanning) scanning technique is utilized to obtain density, effectively the atom coefficient information of various article in luggage parcel further, through compton backscattering data processing and imaging, measure the contraband goodss such as explosive, drugs, gasoline thus, achieve the object that employing X-ray production apparatus realizes comprehensive safety check simultaneously.
The whole Measurement & Control of single source safety check apparatus of 2.L shape structure shares 1 industrial computer.Before compton backscattering detector, Compton, between scattering detector and X-ray transmission detector, thicker radiation shield is set, shielding transmission photons is on the interference of Compton photon survey and impact, and scattering before making its transmission measurement and Compton, backward scattering are measured and shared 1 x-ray source.It is more convenient that this apparatus structure is simpler, volume is less, communication control system more simplifies, detection speed is faster, sensitivity is higher, operation runs.
The transmission detector array of 3.L shape structure is more convenient for recording the density x thickness information of the height of tested article vertical direction, the upper and lower barrier bed of contraband goods and high atomic number chaff interference, be conducive to rejecting these barrier beds and chaff interference to the impact of contraband detecting result, improve the accuracy detected; Compton scattering detector array parallel is up and down more convenient for recording shape size and the position of tested article horizontal direction, is conducive to the reliability and the safety check quality that improve contraband detecting.Meanwhile, the transmission detector array height of L shape structure can change according to the change of large, medium and small type safety check apparatus with the length of width, Compton scattering detector array parallel up and down, more adapts to the needs in all kinds of detection place.
4. the picture rich in detail obtaining various article in luggage parcel is detected by X-ray transmission, by the density x thickness information of measured object, be shown as gray level image, and according to different materials attribute, atomic number range in measured object, image Cheng Lan, green, orange three kinds of colors, be easy to differentiate the contraband goods such as metal weapon, cutter wherein hidden; Detected the density, effectively the atom coefficient information that obtain various article in luggage parcel by scattering before X ray Compton and backward scattering, carry out data processing and imaging, further by effective atom coefficient Z with the Compton scattering image software that to combine with transmission measurement
effthe effective atom of low coefficient of <10, its density is larger than the articles for daily use such as fabric, plastics again and the aobvious orange contraband goods such as explosive, drugs is shown as redness, yellow, then according to the density of the food such as water, beverage and the inflammable thing such as gasoline, alcohol, equivalent atom difference of coefficients, the inflammable thing such as its gasoline is shown as pink; Like this, just can be detected the contraband goods such as metal weapon, cutter, explosive, drugs, gasoline wherein hidden by a transmission of tested article and Compton scattering scanning survey simultaneously, increase substantially safety check quality.This device is best suited for that airport, large-scale meeting-place, meeting concerning foreign affairs etc. are high-grade, the public safety place of guard key.
5. this device can configure the detector array of different size according to actual needs, uses reliably convenient, and cheaper, more economical, is more suitable for China's actual conditions and developing country's demand.
Four, accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is front elevation when using this pick-up unit to detect, and wherein detected material comprises the non-contrabands such as water and the contraband goods such as explosive, gasoline.
Fig. 3 is the side view of Fig. 2.
Fig. 4 is that biography system component figure is adopted in single source X-ray security inspection device Compton scattering detection of L shape structure.
Fig. 5 is single source X-ray transmission and the Compton scattering safety check apparatus inspection software process flow diagram of L shape structure.
In figure, 1. industrial computer, 2. device pedestal, 3. compton backscattering detector array, 4. driver support, 5. collimating apparatus after backward scattering detection, 6. backscatter detector radiation shield, 7. travelling belt, 8.X radiographic source, 9. asymmetric fan-shaped transmission photons bundle, 10. the parallel photon beam of compton backscattering, 11. L shape transmission detector array, 12. security check passages, collimating apparatus after 13. transmission detection, the fan-shaped front collimating apparatus of 14. x-ray source, collimating apparatus after scatter sounding before 15., the parallel photon beam of scattering before 16. Comptons, scattering detector array before 17. Comptons, scattering detector radiation shield before 18., 19. side cover plates, 20. lamina tectis, 21. measured objects, the contraband goodss such as the explosive in 22. measured objects, 23. water, the non-contrabands such as fabric, the inflammable thing such as 24. gasoline.
In figure, scattering detector array 17 before compton backscattering detector array 3, Compton, transmission detector array 11 is arranged on DH control panel, is provided with USB general-purpose interface.
Five, embodiment
Drawings illustrate embodiments of the invention.
In the present embodiment, the structure of single source X ray safety check apparatus of the L shape structure of invention is see accompanying drawing 1.
Whole Measurement & Control shares 1 industrial computer 1, and industrial computer is arranged on below security check passage 12, the rear side of device pedestal 2.The shared radiographic source that x-ray source 8 is measured as scattering before transmission measurement and Compton, backward scattering.This example selects the 200W X-ray production apparatus of high, the asymmetric wide segment angle of a domestic small volume, stability for sharing 1 radiographic source.X-ray source 8 and the fan-shaped front collimating apparatus 14 of x-ray source thereof be arranged on the outer side of security check passage centre and higher than travelling belt.
L shape transmission detector array 11 and thereafter collimating apparatus 13 to be arranged on directly over outside security check passage 12 and upper end, the left and right sides outside passage, and L shape transmission detector array 11 and x-ray source 8 form the geometry structure of transmission measurement and imaging through the asymmetric fan-shaped transmission photons bundle 9 of fan-shaped front collimating apparatus.
Compton backscattering detector array 3 is parallel with scattering detector array about 17 before Compton.Compton backscattering detector array 3 and thereafter collimating apparatus 5 are arranged on below channel conveyor, and compton backscattering detector array 3 photon beam 10 parallel with the compton backscattering that tested article penetrate forms compton backscattering and measure and the geometry structure of imaging.Before Compton scattering detector array 17 and thereafter collimating apparatus 15 be arranged on directly over outside security check passage, before Compton, scattering detector array 17 and the parallel photon beam 16 of scattering before the Compton that tested article penetrate form the geometry structure of scatterometry and imaging before Compton.
At backscatter detector, thicker radiation shield 6 and 18 is set between front scattering detector and transmission detectors respectively, shielding transmission photons on the interference of Compton photon survey and impact, in order to solve the problem that in transmission detection and compton backscattering, front scattering testing process, shared 1 x-ray source interferes with each other.
Safety check process of the present invention is see accompanying drawing 2,3,5.
Detected material is passing through detection travelling belt, this pick-up unit will carry out X-ray transmission and Compton scattering detection respectively, X-ray transmission is adopted to detect the metal such as weapon, cutter contraband goods, adopt Compton scattering to detect the contraband goods such as drugs, explosive, and guarantee that two kinds of detections do not interfere with each other, measure accurate.
Testing process as shown in Figure 5.After detected material enters security check passage, this device starts ray machine and transfer control, under the control of inspection software, carry out transmission TR to detect data and the Compton CS that falls apart and penetrate the collection of data, the data gathered will carry out the comparison of image display, TR contours extract, image characteristics extraction and scale database data, finally, result into coloured image and export, as do not found, contraband goods is directly let pass, as any contraband is then reported to the police.
See accompanying drawing 2,3.
Transmission measurement: when be concealed with metal weapon, cutter, explosive, drugs measured object 21 be put into the entrance of security check passage 12 travelling belt 7 on after, when being sent to passage transmission measurement region, x-ray source 8 through the asymmetric fan-shaped photon beam of front collimating apparatus 14 through the transmission photons bundle 9 sent after measured object, transmission scan measurement is carried out by L shape transmission detector array 11, obtain shape size and the density x thickness information thereof of various article in measured object 21, measure transmission image clearly thus, be shown as gray level image.According to different materials attribute, atomic number range in measured object, image Cheng Lan, green, orange three kinds of colors, measure the contraband goods such as metal weapon, cutter hidden in measured object 21 thus.
Compton scattering is measured: when measured object 21 be sent on conveyor belt 7 passage nestle up the Compton scattering measured zone in transmission measurement region time, the backward compton scattering bundle 10 penetrated from tested article collimating apparatus 5 after backward scattering detection carries out backward scattering scanning survey by backscatter detector array 3; Meanwhile, from collimating apparatus 15 after the premenstrual scatter sounding of the parallel photon beam of scattering 16 before tested article penetrate by scattering detector array 17 before Compton) carry out front scattering scanning survey.Density, effectively the atom coefficient information of hiding the contraband goodss such as explosive 22, drugs, gasoline 24 in measured object 21 is obtained by forward scattering and backscattering measurement result, to combine with transmission measurement with compton backscattering, front scatterometry and carry out data processing imaging, further by Z
effeffective atom coefficient of <10 is low, and than the articles for daily use such as fabric, plastics are large, aobvious orange material is shown as redness, yellow, as the dangerous material such as explosive, drugs to its density again; According to the density of the non-contraband such as water, beverage 23 and the inflammable thing such as gasoline, alcohol 24, equivalent atom difference of coefficients, the inflammable thing such as its gasoline 24 are shown as pink again.
Test result: X-ray transmission safety check apparatus can only check out with metal weapon, cutter etc., is difficult to differentiate the material that effectively atom coefficient is low such as fabric, plastics, explosive, drugs.The contraband goods that effectively atom coefficient is low such as metal weapon, cutter, explosive, drugs, gasoline can be detected with single source X-ray transmission of L shape structure of the present invention and backward scattering safety check apparatus simultaneously, safety check quality can be increased substantially.
In the present embodiment, the L shape transmission detector array 11 of single source X ray safety check apparatus of L shape structure adopts to resemble to count and is of a size of 1.6 × 2.0mm
2the detector assembly with international standard interface that miniature silicon photoelectric diode (Si-PIN) and cesium iodide (CsI (Tl)) scintillation crystal are made.Compton backscattering detector array 3 and front scattering detector array 17 are that the number that resembles developed voluntarily is of a size of 5.8 × 5.8mm
2the detector assembly with international standard interface made by small-sized silicon photoelectric diode (Si-PIN) and cesium iodide (CsI (Tl)) scintillation crystal.
See accompanying drawing 4.Transmission and Compton scattering measurement data are adopted biography system and are made up of 64, No. 16 low-noise preamplifiers, main amplifier, multichannel analog signals acquisition module, A-D converter, programmable data processing circuit, USB interface, low noise power supply etc. respectively, and structure is simple, gather, transmission is reliable.
Claims (7)
1. single source X-ray transmission of a L shape structure and Compton scattering safety check apparatus, be arranged on luggage security inspection machine, luggage security inspection machine comprises frame, device pedestal (2), left and right sidewall, lamina tecti (20), security check passage (12), travelling belt (7), it is characterized in that: the x-ray source (8) and the L shape transmission detector array (11) that adopt asymmetric wide segment angle, scattering before transmission measurement and Compton, backward scattering are measured and are shared an x-ray source (8), and whole Measurement & Control shares an industrial computer (1); Industrial computer (1) is arranged on a proceeds posterolateral of base (2); Thicker radiation shield (6,18) is set between scattering detector array (17) and L shape transmission detector array (11) before compton backscattering detector array (3), Compton;
The x-ray source (8) of asymmetric wide segment angle and fan-shaped front collimating apparatus (14) thereof be arranged on the outer side of security check passage centre and higher than travelling belt (7), after L shape transmission detector array (11) and transmission detection thereof, collimating apparatus (13) is arranged on directly over security check passage and the upper end, the left and right sides of passage, and L shape transmission detector array (11) and x-ray source form the geometry structure of transmission measurement and imaging through the asymmetric fan-shaped transmission photons bundle (9) of fan-shaped front collimating apparatus (14); Compton backscattering detector array (3) is arranged on below channel conveyor, and compton backscattering detector array (3) and the parallel photon beam of compton backscattering (10) that tested article penetrate form compton backscattering and measure and the geometry structure of imaging; Be arranged on directly over security check passage with scattering detector array (17) before the Compton that compton backscattering detector array (3) is parallel up and down, before Compton, scattering detector array (17) and the parallel photon beam of scattering (16) before the Compton that tested article penetrate form the geometry structure of scatterometry and imaging before Compton.
2. safety check apparatus as claimed in claim 1, is characterized in that: the height of described L shape transmission detector array (11) and width, compton backscattering parallel up and down change according to actual needs from the length of front scattering detector array (3,17) and different.
3. safety check apparatus as claimed in claim 1, is characterized in that: x-ray source (8) employing volume is little, stability is high, the 200W X-ray production apparatus of fan-shaped angular width.
4. safety check apparatus as claimed in claim 1, is characterized in that: industrial computer is arranged on the rear, left side of device pedestal (2).
5. safety check apparatus as claimed in claim 1, is characterized in that: before Compton back of the body detector array (3), Compton, scattering detector array (17) adopts silicon photoelectric diode and cesium iodide scintillation crystal to make, and has international standard interface; L shape transmission detector array (11) is the detector assembly adopting silicon photoelectric diode and cesium iodide scintillation crystal to make, and has international standard interface.
6. safety check apparatus as claimed in claim 1, it is characterized in that: Compton scattering measurement data adopts biography system Shi You No. 16 low-noise preamplifier, main amplifier, multichannel analog signals acquisition module, A-D converter, programmable data processing circuit composition, arranges USB interface and exports; Transmission measurement data are made up of No. 64 low-noise preamplifiers, main amplifier, multichannel analog signals acquisition module, A-D converter, programmable data processing circuit, arrange USB interface and export.
7. safety check apparatus as claimed in claim 5, is characterized in that: described compton detector array (3,17) adopts imaging number to be of a size of 5.8 × 5.8mm
2small-sized silicon photoelectric diode and cesium iodide scintillation crystal make the minimonitor assembly with international standard interface.
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| CN104267053A (en) * | 2014-09-30 | 2015-01-07 | 包微微 | Novel detector for liquid prohibited articles |
| CN104407673A (en) * | 2014-12-10 | 2015-03-11 | 四川中科腾信科技有限公司 | Public security integration information processing device applied in drug inspection |
| CN104502381A (en) * | 2015-01-06 | 2015-04-08 | 安徽中福光电科技有限公司 | 6331 method for solving practicability problem of channel type X ray machine |
| CN104535594A (en) * | 2015-01-08 | 2015-04-22 | 安徽中福光电科技有限公司 | Luggage security check method based on X-rays, DR and CBS and intelligent X-ray machine |
| CN106198580A (en) * | 2016-08-26 | 2016-12-07 | 合肥丁点网络科技有限责任公司 | A kind of X-ray screening machine luggage dangerous materials fast automatic detecting alarm device and method |
| CN107331429B (en) * | 2017-08-10 | 2023-05-23 | 海默科技（集团）股份有限公司 | Multiphase flow phase fraction measuring device single-source dual-energy gamma and X-ray source bin |
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| CN113970567B (en) * | 2020-07-22 | 2023-01-31 | 同方威视技术股份有限公司 | Back scattering imaging device, control method and inspection system |
| CN114153000A (en) * | 2021-11-12 | 2022-03-08 | 中国铁道科学研究院集团有限公司电子计算技术研究所 | Multilayer security inspection system |
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