CN102914555A - 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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- CN102914555A CN102914555A CN2012104679046A CN201210467904A CN102914555A CN 102914555 A CN102914555 A CN 102914555A CN 2012104679046 A CN2012104679046 A CN 2012104679046A CN 201210467904 A CN201210467904 A CN 201210467904A CN 102914555 A CN102914555 A CN 102914555A
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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 the X ray transmission of single source and Compton scattering safety check apparatus and detection method thereof of the L shaped structure of using at luggage security inspection machine.
Two, background technology
1. X ray transmission method:
Generally adopt this method both at home and abroad, because material is to the absorption of X ray, have part energy and be absorbed after X ray passes checking matter, different types of material is different to the receptivity of X ray, and the energy the when X-ray beam that passes different materials arrives detector also is different.Through processing, 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 the dual-energy x-ray transmission method, and the precision of dual-energy x-ray detection method identification material is weighed with the precision of differentiating effective atomic number.The Security Inspection Equipments that is used for the important departments such as airport, customs, railway mostly is 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 goes out the effective atomic number Z of inspected object component according to these two kinds of information calculations
EffInformation, thus realization can be separated inorganics, as the inorganicss such as glass common in the luggage are isolated classification and the identification of inspected object from organism.But to Z
EffPlastics, fabric, explosive and drugs that value approaches can't be differentiated, and solve with backward scattering.
3. X ray backward scattering method: transmission, absorption and three kinds of situations of scattering can occur in X ray and matter interaction, X ray both domestic and external backward scattering (CBS) method is used chopper wheel and flying-spot scanner technology exactly, becoming with transmission photon direction＞=90
0Direction is measured by the backward scattering photon that penetrates on the tested article with the backward scattering detector array.The effective atomic number Z of backscatter signal and tested article
EffRelevant, show and organism, explosive, drugs etc. can be differentiated with the backscatter images gray scale.And this X ray backward scattering safety check apparatus detects effect and also has not enoughly, and the most serious accident is: do not check out explosive with this backward scattering safety check apparatus and cause on-the-spot the blast during U.S.'s Atlanta Olympic Games.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 be installed 450, its complex structure, and detection speed is slower, and is expensive, is difficult to apply in developing country.
4. the Computed tomography of X ray (CT) method: the method is suitable for large-scale luggage parcel, CTX9000 baggage screening system, U.S. L-3CSDS company that AM General intelligence scientific ﹠ technical corporation produces produce 3DX Explosives Detection System, its complex structure.Price is very expensive, more is 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 at first to be developed at home the gamma-rays transmission desk-top screening machine that combines with backward scattering with units concerned, because the radiological safety protection of gamma ray radiator and keeping problem, the public is poor to the degree of recognition of this screening machine, makes it be difficult to apply.
Three, summary of the invention
The objective of the invention is for above-mentioned the deficiencies in the prior art, a kind of X ray transmission of single source and Compton scattering safety check apparatus that can comprehensively, extensively detect metal cutter, weapon and drugs in the luggage, explosive contraband goods simultaneously is provided.This safety check apparatus is more suitable for China's actual conditions, is easier to apply in developing country, detection speed is faster, detect better effects if, price is more cheap.
The objective of the invention is to reach like this: a kind of the X ray transmission of single source and Compton scattering safety check apparatus of L shaped structure are installed on the luggage security inspection machine.Luggage security inspection machine comprises frame, base, left and right sides sidewall, lamina tecti, security check passage, travelling belt machine.It is characterized in that: adopt x-ray source and the L shaped transmission detector array of asymmetric wide segment angle, scattering before transmission measurement and the Compton, backward scattering are measured and are shared an x-ray source,, all measure with control and share an industrial computer.Thicker radiation shield is set between scattering detector array and the L shaped transmission detector array before compton backscattering detector array, Compton.Industrial computer is installed in a proceeds posterolateral of device pedestal.
The x-ray source of asymmetric wide segment angle and fan-shaped front collimating apparatus thereof are installed in the centre of the outer side of security check passage and are higher than travelling belt, L shaped transmission detector array and thereafter collimating apparatus be installed in security check passage directly over and upper end, the left and right sides of passage, L shaped transmission detector array and x-ray source are through the asymmetric fan-shaped transmission photon beam formation transmission measurement of front collimating apparatus and the geometry structure of imaging.The compton backscattering detector array be installed in the passage travelling belt below, the parallel photon beam of the compton backscattering that penetrates on compton backscattering detector array and the tested article consists of that compton backscattering is measured and the geometry structure of imaging.With the compton backscattering detector array up and down before the parallel Compton scattering detector array be installed in security check passage directly over, the geometry structure of scatterometry and imaging before the parallel photon beam formation of the scattering Compton before the Compton of penetrating on scattering detector array and the tested article the Compton before.
Industrial computer is installed in the rear, left side of device pedestal.
The height of L shaped transmission detector array changes according to actual needs from the length of front scattering detector array with width, compton backscattering and is different.
X-ray source employing volume is little, stability is high, the 200W X-ray production apparatus of fan-shaped angular width.
The scattering detector array adopts silicon photoelectric diode and cesium iodide scintillation crystal to make before compton backscattering detector array and the Compton, has international standard interface; L shaped transmission detector array is the detector assembly that adopts silicon photoelectric diode and cesium iodide scintillation crystal to make, and has international standard interface.
The Compton scattering measurement data is adopted the biography system and is comprised of No. 16 low-noise preamplifiers, main amplifier, multichannel analog signals acquisition module, A-D converter, programmable data processing circuit, and USB interface output is set; Transmission measurement adopts 64 circuit-switched data to adopt the biography system, and USB interface output is set.
Advantage of the present invention is:
1.L single source safety check apparatus of shape structure takes full advantage of the characteristics of X ray transmission (TR – Transmission Scanning) and Compton scattering (CS – Compton Scatter Scanning), utilize X ray transmission (TR) scanning technique to obtain shape size, the density thickness information of various article in the luggage parcel, be shown as the gray scale of different brackets, record thus clearly transmission image and detect the contraband goodss such as metal weapon, cutter; Further utilize X ray compton backscattering (CBS – Compton Backscatter Scanning) and front scattering (CFS – Compton Fontscatter Scanning) scanning technique to obtain the density of various article in the luggage parcel, effective atom coefficient information, process and imaging through the compton backscattering data, measure thus the contraband goodss such as explosive, drugs, gasoline, realized adopting an X-ray production apparatus to realize simultaneously the purpose of comprehensive safety check.
2.L single source safety check apparatus of shape structure is all measured with control and is shared 1 industrial computer.Thicker radiation shield is set between scattering detector and the X ray transmission detectors before compton backscattering detector, Compton, shielding transmission photon is on interference and the impact of Compton photon survey, makes scattering before its transmission measurement and the Compton, shared 1 x-ray source of backward scattering measurement.This apparatus structure is simpler, volume is less, the communication control system is more simplified, detection speed is faster, sensitivity is higher, the operation operation is more convenient.
3.L height, contraband goods that the transmission detector array of shape structure is more convenient for recording tested article vertical direction be the density thickness information of barrier bed and high atomic number chaff interference up and down, be conducive to reject these barrier beds and chaff interference to contraband detecting result's impact, improve the accuracy that detects; Parallel Compton scattering detector array is more convenient for recording shape size and the position of tested article horizontal direction up and down, is conducive to improve reliability and the safety check quality of contraband detecting.Simultaneously, the transmission detector array height of L shaped structure with width, the length of parallel Compton scattering detector array can change according to the variation of large, medium and small type safety check apparatus up and down, more adapts to the needs in all kinds of detections place.
4. detect the picture rich in detail that obtains various article in the luggage parcel by the X ray transmission, density thickness information by measured object, be shown as gray level image, and according to different materials attribute, atomic number range in the measured object, image Cheng Lan, green, three kinds of colors of orange, be easy to differentiate the contraband goodss such as wherein hiding metal weapon, cutter; Detect to obtain the density of various article in the luggage parcel, effective atom coefficient information by scattering and backward scattering before the X ray Compton, carry out data processing and imaging with the Compton scattering image software that combines with transmission measurement, further with effective atom coefficient Z
Eff＜10 the effective atom of low coefficient, its density is larger than articles for daily use such as fabric, plastics and the contraband goodss such as aobvious orange explosive, drugs are shown as redness, yellow again, and density, the equivalent atom difference of coefficients according to inflammable thing such as the food such as water, beverage and gasoline, alcohol is shown as pink with inflammable thing such as its gasoline again; Like this, a transmission by tested article and Compton scattering scanning survey just can detect the contraband goodss such as the metal weapon wherein hidden, cutter, explosive, drugs, gasoline simultaneously, have increased substantially the 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 arrays of different sizes according to actual needs, uses convenient reliably, and cheaper, more economical is more suitable for China's actual conditions and developing country's demand.
Four, description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the front elevation when using this pick-up unit to detect, and wherein detected material comprises the contraband goodss such as the non-contraband such as water and 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 shaped structure.
Fig. 5 is that the X ray transmission of single source and the Compton scattering safety check apparatus of L shaped structure detects software flow pattern.
Among the figure, 1. industrial computer, 2. device pedestal, 3. compton backscattering detector array, 4. driver support, collimating apparatus, 6. backward scattering detector radiation shield after 5. backward scattering is surveyed, 7. travelling belt, 8.X radiographic source, 9. asymmetric fan-shaped transmission photon beam, the 10. parallel photon beam of compton backscattering, 11. L shaped transmission detector array, 12. security check passage, collimating apparatus after 13. transmissions are surveyed, the fan-shaped front collimating apparatus of 14. x-ray sources, 15. collimating apparatus after the front scatter sounding, 16. the parallel photon beam of scattering before the Compton, scattering detector array before 17. Comptons, 18. front scattering detector radiation shields, 19. side cover plate, 20. lamina tecti, 21. measured objects, the contraband goodss such as explosive in 22. measured objects, 23. water, the non-contrabands such as fabric, the inflammable thing such as 24. gasoline.
Among the figure, scattering detector array 17 before compton backscattering detector array 3, the Compton, transmission detector array 11 is installed on the DH control panel, is provided with the USB general-purpose interface.
Five, embodiment
Accompanying drawing has provided embodiments of the invention.
In the present embodiment, the structure of single source X ray safety check apparatus of the L shaped structure of invention is referring to accompanying drawing 1.
All measure with control and share 1 industrial computer 1, industrial computer is installed in the rear side of security check passage 12 belows, device pedestal 2.X-ray source 8 as transmission measurement and Compton before the shared radiographic source measured of scattering, backward scattering.This example selects a domestic small volume, stability 200W X-ray production apparatus high, asymmetric wide segment angle to be shared 1 radiographic source.The fan-shaped front collimating apparatus 14 of x-ray source 8 and x-ray source thereof is installed in the centre of the outer side of security check passage and is higher than travelling belt.
L shaped transmission detector array 11 and thereafter collimating apparatus 13 be installed in security check passage 12 outer directly over and the outer upper end, the left and right sides of passage, L shaped transmission detector array 11 and x-ray source 8 consist of the geometry structure of transmission measurements and imaging through the asymmetric fan-shaped transmission photon beam 9 of fan-shaped front collimating apparatus.
The scattering detector array is parallel about in the of 17 before compton backscattering detector array 3 and the Compton.Compton backscattering detector array 3 and thereafter collimating apparatus 5 be installed in the passage travelling belt below, the parallel photon beam 10 of compton backscattering that penetrates on compton backscattering detector array 3 and the tested article consists of the geometry structure of compton backscatterings measurements and imaging.Before the Compton scattering detector array 17 and thereafter collimating apparatus 15 be installed in security check passage outer directly over, the geometry structure of scatterometry and imaging before the parallel photon beam of the scattering 16 formation Comptons before the Compton of penetrating on scattering detector array 17 and the tested article the Compton before.
Safety check process of the present invention is referring to accompanying drawing 2,3,5.
Detected material is through the detection travelling belt time, this pick-up unit detects carrying out respectively X ray transmission and Compton scattering, adopt the X ray transmission to detect the metal contraband goodss such as weapon, cutter, adopt Compton scattering to detect the contraband goodss such as drugs, explosive, and guarantee that two kinds of detections do not interfere with each other, measure accurately.
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 that detects software, carry out the loose CS in transmission TR detection data and Compton and penetrate data acquisition, the data that gather will be carried out the comparison of image demonstration, the extraction of TR profile, image characteristics extraction and scale database data, and will be last, and the result into coloured image output, as finding that not contraband goods directly lets pass, then report to the police such as any contraband.
Referring to accompanying drawing 2,3.
Transmission measurement: be put on the travelling belt 7 of entrance of security check passage 12 when the measured object 21 that is concealed with metal weapon, cutter, explosive, drugs after, when being sent to passage transmission measurement zone, the asymmetric fan-shaped photon beam of x-ray source 8 and the front collimating apparatus 14 of process passes the transmission photon beam 9 that sends behind the measured object, carrying out transmission scan by L shaped transmission detector array 11 measures, obtain shape size and the density thickness information thereof of various article in the measured object 21, measure thus clearly transmission image, be shown as gray level image.According to different materials attribute, atomic number range in the measured object, image Cheng Lan, green, three kinds of colors of orange, measure thus the contraband goodss such as metal weapon hiding in the measured object 21, cutter.
Compton scattering is measured: when measured object 21 when travelling belt 7 is sent to passage and nestles up the Compton scattering measured zone in transmission measurement zone, carry out the backward scattering scanning survey from compton backscattering photon beam 10 collimating apparatus 5 after backward scattering is surveyed that tested article penetrate by backward scattering detector array 3; Simultaneously, the parallel photon beam 16 of front scattering that penetrates from tested article after front scatter sounding collimating apparatus 15 by the Compton before scattering detector array 17) carry out front scattering scanning survey.Obtain to hide in the measured object 21 density of the contraband goodss such as explosive 22, drugs, gasoline 24, effective atom coefficient information by the forward scattering and backscattering measurement result, combine with transmission measurement with compton backscattering, front scatterometry and to carry out data and be processed into picture, further with Z
EffEffective atom coefficient of＜10 is low, and aobvious orange material is shown as redness, yellow to its density than the articles for daily use such as fabric, plastics are large again, such as dangerous material such as explosive, drugs; Density, equivalent atom difference of coefficients according to non-contrabands such as water, beverage 23 and the inflammable thing 24 such as gasoline, alcohol is shown as pink with inflammable thing such as its gasoline 24 again.
Test result: X ray transmission safety check apparatus can only check out with metal weapon, cutter etc., is difficult to differentiate the effectively low material of atom coefficient such as fabric, plastics, explosive, drugs.The X ray transmission of single source and backward scattering safety check apparatus with L shaped structure of the present invention can detect the contraband goods that effectively the atom coefficient is low such as metal weapon, cutter, explosive, drugs, gasoline simultaneously, can increase substantially the safety check quality.
In the present embodiment, the L shaped transmission detector array 11 of single source X ray safety check apparatus of L shaped 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 is made.Compton backscattering detector array 3 and front scattering detector array 17 are that the number that resembles of developing voluntarily is of a size of 5.8 * 5.8mm
2Small-sized silicon photoelectric diode (Si-PIN) and cesium iodide (CsI (Tl)) scintillation crystal is made the detector assembly with international standard interface.
Referring to accompanying drawing 4.Transmission and Compton scattering measurement data are adopted the biography system and are comprised 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, simple in structure, gather, transmission is reliable.
Claims (7)
1. the X ray transmission of single source and the Compton scattering safety check apparatus of a L shaped structure, be installed on the luggage security inspection machine, luggage security inspection machine comprises frame, device pedestal (2), left and right sides sidewall, lamina tecti (20), security check passage (12), travelling belt (7), it is characterized in that: the x-ray source (8) and the L shaped transmission detector array (11) that adopt asymmetric wide segment angle, scattering before transmission measurement and the Compton, backward scattering are measured and are shared an x-ray source (8), all measure with control and share an industrial computer (1); Industrial computer (1) is installed in a proceeds posterolateral of base (2); Thicker radiation shield (6,18) is set between scattering detector array (17) and the L shaped transmission detector array (11) before compton backscattering detector array (3), Compton;
The x-ray source of asymmetric wide segment angle (8) and fan-shaped front collimating apparatus (14) thereof are installed in the centre of the outer side of security check passage and are higher than travelling belt (7), after L shaped transmission detector array (11) and transmission thereof are surveyed collimating apparatus (13) be installed in security check passage directly over and the upper end, the left and right sides of passage, L shaped transmission detector array (11) and x-ray source consist of the geometry structure of transmission measurement and imaging through the asymmetric fan-shaped transmission photon beam (9) of fan-shaped front collimating apparatus (14); Compton backscattering detector array (3) be installed in the passage travelling belt below, the parallel photon beam of compton backscattering (10) that penetrates on compton backscattering detector array (3) and the tested article consists of that compton backscattering is measured and the geometry structure of imaging; With compton backscattering detector array (3) up and down before the parallel Compton scattering detector array (17) be installed in security check passage directly over, the parallel photon beam of scattering (16) consists of the geometry structure of scatterometry and imaging before the Compton before the Compton of penetrating on scattering detector array (17) and the tested article before the Compton.
2. safety check apparatus as claimed in claim 1 is characterized in that: the height of described L shaped transmission detector array (11) and width, parallel compton backscattering changes according to actual needs from the length of front scattering detector array (3,17) and is different up and down.
3. safety check apparatus as claimed in claim 1 is characterized in that: x-ray source (8) adopts that 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, it is characterized in that: industrial computer is installed in the rear, left side of device pedestal (2).
5. safety check apparatus as claimed in claim 1 is characterized in that: scattering detector array (17) employing silicon photoelectric diode and cesium iodide scintillation crystal are made before Compton back of the body detector array (3), the Compton, have international standard interface; L shaped transmission detector array (11) is the detector assembly that adopts 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: the Compton scattering measurement data is adopted the biography system and is comprised of No. 16 low-noise preamplifiers, main amplifier, multichannel analog signals acquisition module, A-D converter, programmable data processing circuit, and USB interface output is set; The transmission measurement data are comprised of No. 64 low-noise preamplifiers, main amplifier, multichannel analog signals acquisition module, A-D converter, programmable data processing circuit, and USB interface output is set.
7. safety check apparatus as claimed in claim 5 is characterized in that: described compton detector array (3,17) adopts the 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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