CN103018782B - Single source low energy X ray backward scattering and transmission human body detecting device - Google Patents
Single source low energy X ray backward scattering and transmission human body detecting device Download PDFInfo
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- CN103018782B CN103018782B CN201210525258.4A CN201210525258A CN103018782B CN 103018782 B CN103018782 B CN 103018782B CN 201210525258 A CN201210525258 A CN 201210525258A CN 103018782 B CN103018782 B CN 103018782B
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Abstract
Single source low energy X ray backward scattering and transmission human body detecting device.Asymmetric wide segment angle x-ray source and fan-shaped front collimating apparatus thereof are arranged on outside sense channel, control desk one side-lower.The transmission photons bundle penetrated by shared x-ray source and transmission detector array form the geometry structure of transmission measurement and imaging; The backward scattering photon beam penetrated through measured object by fan-shaped transmission photons bundle and backscatter detector array form the geometry structure of backward scattering measurement and imaging.Between backscatter detector and transmitted X-ray beam, be provided with radiation shield, be provided with controlled leafy smooth hurdle at ray exit portal, whole Measurement & Control shares an industrial computer.The scanning technique that the present invention utilizes backward scattering to combine with transmission, structure is simple, low price, detection speed are very fast, sensitivity is very high, dosage suffered by people is very little, do not expose individual privacy, the vest pants bomb, explosive, drugs etc. that are hidden in human body can be detected, be applicable to large-scale public safety place.
Description
One, technical field
The present invention relates to X ray safety detecting system, the low energy X ray backward scattering of especially single source and transmission human body detecting device.
Two, background technology
X ray is used for having transmission and backward scattering two kinds of modes to the safety detection of human body.
1, the simple method adopting transmission, this method makes the radiation dose that is subject to by inspection human body comparatively large, and less effective.The Ministry of Public Security three with the cooperation of Yunnan public security bureau adopt the method for X-ray transmission to carry out human detection, its equipment drops into onsite application at home.Through process, the energy size that detector receives shows with grayscale image, and this method is difficult to the contraband goods such as explosive, drugs detecting vest bomb, pants bomb and be hidden in human body, in footwear, has larger limitation.During external use X-ray transmission human body detecting device, omnidirectional is carried out to all detected personnel, can blur-free imaging, by query invasion of privacy, suffer the extensive opposition of the public.
2, second method is 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.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, detection speed is comparatively slow, and the time detecting a people reaches 10 seconds, and expensive, be not suitable for China's actual conditions, be difficult to apply in developing country.
Three, summary of the invention
The object of this invention is to provide a kind of human body detecting device carrying out two kinds of single source low energy X ray backward scatterings detected and transmission.The completing transmission and backward scattering by a shared x-ray source and detect of this equipment.The transmission photons bundle of x-ray source injection and transmission detector array form the geometry structure of transmission measurement and imaging; The backward scattering photon beam penetrated through measured object by fan-shaped transmission photons bundle and backscatter detector array form the geometry structure of backward scattering measurement and imaging.When detecting, first showing the quick testing result of backward scattering, finding no the personnel of contraband goods shadow of doubt, let pass fast.Through backward scattering measure find suspicious points time, extract further quick transmission detected image and compare with backward scattering measurement result, confirm as contraband goods carrier and given as security and examine and retain image evidence.Reach simplified apparatus structure to greatest extent, reduce radiation dose suffered by tested personnel, improve the object of Detection job.
The object of the invention is to reach like this: a kind of single source low energy X ray backward scattering and transmission human body detecting device, comprise rack, human detection passage, travelling belt, industrial computer after rack before driving frame, plant bottom case, sense channel, sense channel.It is characterized in that: share the X-ray machine that an x-ray source is asymmetric wide segment angle, x-ray source and fan-shaped front collimating apparatus thereof are arranged on outside sense channel, control desk one side-lower, linear transmission detector array and thereafter collimating apparatus are arranged on after sense channel in rack, and linear transmission detector array and x-ray source form the geometry structure of transmission measurement and imaging through the asymmetric fan-ray beam of front collimating apparatus; Backscatter detector array and thereafter collimating apparatus are arranged on before sense channel in rack, and the backward compton scattering bundle that backscatter detector array and tested article penetrate forms the geometry structure of backward scattering measurement and imaging.
Be outside equipped with transmission detectors shielding box in transmission detector array, be outside equipped with backscatter detector shielding box at backscatter detector array.
Radiation shield is provided with between backscatter detector array and transmitted X-ray beam.
At ray exit portal, controlled leafy smooth hurdle is installed.
Whole Measurement & Control shares an industrial computer.
Below after sense channel in rack is provided with transmission detector array data processing plate and USB output interface, and the below before sense channel in rack is provided with backscatter detector array data disposable plates and USB output interface.
X-ray source is 100W low energy X ray machine.
Industrial computer to be arranged on plant bottom case, before control desk and sense channel between rack.
Backscatter detector array is of a size of 5.8 × 5.8mm by resembling number
2small-sized silicon photoelectric diode and cesium iodide scintillation crystal make, backscatter detector array and data acquisition pass system is the assembly with international standard interface and size; Transmission detector array adopts miniature silicon photoelectric diode and cesium iodide scintillation crystal to make, and it is the assembly with international standard interface and size that transmission detector array and data acquisition pass system.
Good effect of the present invention is:
1, single source low energy X ray human body detecting device fully, fully utilized the feature of backward scattering (CBS – Compton Backscatter Scanning) and transmission (TR – TransmissionScanning).First compton backscattering fast scanning techniques is utilized to detect row body interior and various article with it density, effectively atom coefficient information, through backward scattering data processing, form the contour images of tested article, do not expose the individual privacy of the personnel of abiding by the law, do not find the personnel of contraband goods shadow of doubt thus, let pass fast and delete the total data that backward scattering (CBS) and transmission (TR) measure; When discovery suspicious points is measured in backward scattering, utilize transmission scan to measure TR image further and detect suspicious body interior and hidden contraband with it shape size, density x thickness information, measure transmission image clearly thus, and CBS measurement data and TR measurement data are compared, confirm that any contraband person detains pending trial, and preserve its total data measured; As still having doubtful point person, also constant speed can drive in the wrong direction and re-start backward scattering (CBS) and transmission (TR) scanning survey, reaffirming and whether let pass or detain pending trial.
2, this checkout equipment is first measured by rapid scanning, greatly reduces the radiation dose stood by inspection people; Backward scattering rapid scanning is measured and data processing, only forms the contour images by inspection human body and tested article, does not expose the individual privacy of the personnel of abiding by the law, and no longer shows transmission detect the personnel of abiding by the law; And clear transmission detected image is shown further to suspicion personnel, the crime fact of suspicion or locking lawless people can be got rid of.
3, this equipment is provided with controlled leafy smooth hurdle at ray exit portal, by shooting and leafy smooth hurdle adjustment, can use different light hurdle sizes respectively, radiation dose suffered by subject can be reduced to minimum for differing heights, different sexes, all ages and classes.
4, whole Measurement & Control of this equipment share an industrial computer; Between backscatter detector and transmission detectors, arrange radiation shield, shielding transmission photons, on the interference of backward scattering photon survey and impact, makes its transmission and backward scattering measure and shares 1 x-ray source; Its structure is simple, volume is less, communication control system simplifies, detection speed is fast, highly sensitive, simple operation.
5, first this equipment detected fast by X ray backward scattering and obtain density, effectively the atom coefficient information that human body carries various article, can be tested with fast without explosive, drugs, particularly detect the vest of sheet type, pants bomb has very high sensitivity, can let pass in the clear personnel as early as possible; Further extraction X-ray transmission detects terrified suspect and carry the density x thickness information of various article in body with it, picture rich in detail can be demonstrated, and compare with backward scattering measurement data, confirm with or without contraband goods further, determine that its clearance still detains pending trial.This equipment has increased substantially safety detection quality and detection speed, detection speed can reach per person 0.5 second, 1/2 of existing transmission checkout equipment detection speed, 1/20 of backward scattering checkout equipment detection speed, be suitable for that airport, large-scale meeting-place, meeting concerning foreign affairs etc. are high-grade, the public safety place of guard key most.
6, this equipment price is cheap, use is economical, is more suitable for China's actual conditions and developing country's demand.
Five, accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is testing process skeleton view, and in figure, security check passage has been stood subject, detects the contraband goodss such as the drugs hidden in vest bomb that examined human body wears, pants bomb, front and the lower part of the body, the explosive hidden in footwear.
Fig. 3 is the vertical view of Fig. 1.
To be backward scattering detection array pass system component figure with adopting to Fig. 4.
Fig. 5 is this device detection procedure hardware and software program flow diagram.
Fig. 6 is this device detection procedure process flow diagram.
In figure, 1 camera mount anchor point, 2 Stairs, 3 support pulley, 4 travelling belts, 5 plant bottom cases, 6 driving frames, 7 transmission detectors data processing plates and USB output interface, 8 backscatter detector data processing plates and USB output interface, the explosive hidden in 9 footwear, 10 industrial computers, collimating apparatus before 11 fan-shaped X-ray, 12 x-ray sources, 13 transmission X-ray entrances, 14 fan-shaped transmission photons bundles, collimating apparatus after 15 transmission detection, 16 transmission detector array, 17 backward scattering photon beams, collimating apparatus after 18 backward scattering detections, the 19 controlled leafy smooth hurdles of X ray exit portal, 20 backscatter detector arrays, 21 pants bombs and the interior drugs hidden of the lower part of the body, rack after 22 sense channels, rack before 23 sense channels, 24 backscatter detector radiation shields, 25 vest bombs and be hidden in the drugs of front, 26 transmission detector array shielding boxs, 27 backscatter detector array shielding boxs, 28 sense channels, 29 control desks, 30 video camera USB interface output lines, 31 camera mounts, 32 video cameras.
Five, embodiment
In the present embodiment, the structure of the low energy X ray backward scattering of single source and transmission human body detecting device is see accompanying drawing 1.
Whole Measurement & Control shares an industrial computer 10, and industrial computer to be arranged on plant bottom case 5, before control desk 29 and sense channel between rack 23.Select a domestic small volume, shared x-ray source 12 that the 100W X-ray production apparatus of high, the asymmetric wide segment angle of stability is measured as transmission measurement and compton backscattering, x-ray source 12 and fan-shaped front collimating apparatus 11 thereof are arranged on that sense channel is outer, control desk one side-lower.Control desk 29 is provided with display, and operating personnel can according to the display adjustment opertaing device of display.
Linear transmission detector array 16 and thereafter collimating apparatus 15 are arranged on after sense channel in rack 22, and transmission detector array 16 forms the geometry structure of transmission measurement and imaging with the asymmetric fan-shaped transmission photons bundle 14 of collimating apparatus 11 before X ray.
Compton backscattering detector array 20 and thereafter collimating apparatus 18 are arranged on before sense channel in rack 23, and the backward scattering photon beam 17 that compton backscattering detector array 20 and the examined human body stood on sense channel 28 and entrained article penetrate forms the geometry structure of backward scattering measurement and imaging.See Fig. 2, in the present embodiment, general backscatter detector array 20 with in the examined human body stood on passage 28 and human body footwear drugs 21, vest bomb hiding in explosive 9, pants bomb and the lower part of the body hidden and be hidden in the geometry structure that the backward scattering photon beam 17 that the drugs 25 of front penetrate forms backward scattering measurement and imaging.
Radiation shield 24 is set between backscatter detector 20 and transmission photons bundle 14, shields transmission photons to the interference of Compton photon survey and impact, in order to solve the problem sharing an x-ray source in transmission detection and backward scattering testing process.
In order to reduce the environmental radiation dose around human body detecting device, being outside equipped with transmission detector array shielding box 26 in transmission detector array 16, being outside equipped with backscatter detector shielding box 27 at backscatter detector array.Meanwhile, X ray exit portal is provided with controlled leafy smooth hurdle 19, the different heights according to subject regulate light hurdle, ensure that its fan-shaped transmission photons bundle is irradiated to below the shoulder of different human body, make the head of all subjects not by the irradiation of ray.
In the present embodiment, the transmission detector array 16 of single source low energy X ray human body detecting device adopts the number that resembles of domestic trial-production and processing to be of a size of 1.6 × 2.0mm
2the detector assembly with international standard interface made by miniature silicon photoelectric diode (Si-PIN) and cesium iodide (CsI (Tl)) scintillation crystal; Compton backscattering detector array 20 is 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 measurement data acquisition passes system, backward scattering measurement data is adopted biography system and is made up of 64 roads and No. 16 low-noise preamplifiers, multichannel main amplifier, multichannel analog signals acquisition module, A-D converter, programmable data processing circuit, USB interface respectively.The backward scattering collected or transmission measurement data-signal are after 64 roads or No. 16 low-noise preamplifiers are amplified, amplify through multichannel pmultiple amplifier again and carry out analog to digital conversion by after the collection of multichannel analog signals acquisition module, export through USB interface by after programmable data processing circuit process.
Testing process of the present invention is see accompanying drawing 2,5,6.In Fig. 5, solid line represents quick testing process, and dotted line represents again reverse constant speed testing process, and dot-and-dash line represents that suspect gives as security careful route.
Testing process comprises human body shooting, light modulation hurdle, selects suitable hardware controls, data acquisition, data processing and result to export several step.Human body shooting recorder's body characteristics and height, be adjusted to below shoulders of human body by controlled leafy smooth hurdle, avoid head to irradiate.According to solid line in Fig. 5, hardware controls is carried out to equipment, comprise ray machine control, Energy control, rapid clockwise control to transmission, carry out backward scattering CBS measurement data acquisition and transmission TR measurement data acquisition fast simultaneously.First show CBS to measure and result, the non-a suspect not finding to carry contraband goods is let pass immediately and deletes CBS and TR and measure total data; When discovery suspicious points is measured in backward scattering, the clear transmission TR image of display transmission scan detection further, and compare with CBS measurement data, get rid of suspicion person and delete total data and let pass; Confirm that any contraband person detains pending trial, and preserve its total data measured; As still having doubtful point person, according to dotted line in Fig. 5, constant speed being carried out to suspect and driving in the wrong direction and re-start backward scattering (CBS) and transmission (TR) scanning survey, reaffirming and whether let pass or detain pending trial.
Concrete testing process is: when subject enters before sense channel, through adjustment scale mistake, by camera record human body Facial Features, highly, sex, differentiate its children, less, blue or green, in, age bracket of waiting for a long time, adjust controlled leafy smooth hurdle 19 again, detect fast below the shoulder making its fan-shaped transmission photons bundle be irradiated to different human body; According to actual conditions to child, juvenile only irradiation leg and pin, chest, leg and pin only can be irradiated to pregnant woman, even allow it carry out hand inspection or avoid detecting.The location of video camera is determined by support anchor point 1 and level altitude support 31, and detection data, with USB output interface line 30, are transferred to industrial computer 10, control desk 29 display by video camera 32.
After subject enters sense channel 28 fast, carry out backward scattering fast and transmission detection by backscatter detector array 20 and transmission detector array 16 simultaneously.
After human body is stood on sense channel 28, by when travelling belt 4 being sent to the transmission measurement region of sense channel, the X ray penetrated by radiographic source 12 is collimated into asymmetric fan-shaped transmission photons bundle 14 through fan-shaped front collimating apparatus 11, through transmission X-ray entrance 13, again transmitted through examined human body and hiding contraband goods, through rear collimating apparatus 15, carry out the measurement of transmission rapid scanning by transmission detector array 16, survey data temporary storage, will not image be shown; When human body passes to backward scattering measured zone simultaneously, transmission photons bundle 14 is mapped to and is subject in inspection human body and hiding contraband goods and penetrates backward scattering photon beam 17, carries out the measurement of backward scattering rapid scanning through the backward scattering photon of collimating apparatus 18 after backward scattering detection by backscatter detector array 20; Confirmed by backward scattering measurement result, do not find the examined personnel of shadow of doubt, let pass, and delete CBS and TR measurement total data, in order to avoid invade the privacy of the personnel that abide by the law; Density, effective atom coefficient information of the contraband goods such as vest bomb, pants bomb, the drugs hidden in front and the lower part of the body, the explosive hidden in footwear of wearing by inspection human body institute is obtained by backward scattering measurement result, contrasted by backward scattering data processing, and form contour images, measured by backward scattering and find suspicious points, extract transmission measurement data immediately, and show TR image, the image software that the backward scattering of application autonomous research and development combines with transmission measurement carries out data processing, and compare with CBS measurement data, confirm that any contraband person detains pending trial; To not confirming with or without hidden contraband person, Suspected Area will be delimited, adjust aligning Suspected Area, leafy smooth hurdle, reduce again by examining radiation dose suffered by position as far as possible, constant speed antikinesis travelling belt, re-start CBS and TR scanning survey, reaffirm and to be let pass without contraband goods person, and delete CBS and TR and measure total data; Confirm that any contraband person detains pending trial.
See accompanying drawing 2, after testing, subject is detected drugs hiding in the explosive be hidden in footwear, pants bomb and the lower part of the body, vest bomb and is hidden in the drugs of front.
Show through domestic and international rig-site utilization: X-ray transmission human body check system is difficult to effectively differentiate the material that effectively atom coefficient is low such as fabric, plastics, explosive, drugs; Organism, explosive, drugs etc. can be differentiated by the backscatter images gray scale display that X ray backward scattering chopper wheel and Flying-spot technology obtain, but this anthropoid checkout facility complex structure, detection speed is slower, expensive, be not suitable for China's actual conditions, be difficult to apply in developing country.Test result shows: single source low energy X ray backward scattering of the present invention and transmission human body detecting device make full use of the fast scanning techniques feature that backward scattering combines with transmission, and it is simple to have structure, low price, detection speed is very fast, sensitivity is very high, suffered by people, dosage is very little, do not expose the features such as individual privacy, utilize the image software that the backward scattering of independent research combines with transmission measurement, carry out data processing and imaging, its process flow diagram is see accompanying drawing 6, the vest bomb being hidden in human body can be detected, explosive in pants bomb and human body, drugs etc., human detection speed and Detection job can be increased substantially.
Claims (6)
1. single source low energy X ray backward scattering and transmission human body detecting device, comprise driving frame (6), plant bottom case (5), rack (23) before sense channel, rack (22) after sense channel, human detection passage (28), travelling belt (4), industrial computer (10), it is characterized in that: share an x-ray source, x-ray source (12) is the X-ray production apparatus of asymmetric wide segment angle, x-ray source (12) and fan-shaped front collimating apparatus (11) thereof are arranged on outside sense channel, control desk (29) one side-lower, linear transmission detector array (16) and thereafter collimating apparatus (15) to be arranged on after sense channel in rack (22), linear transmission detector array (16) and x-ray source (12) form the geometry structure of transmission measurement and imaging through the asymmetric fan-ray beam (14) of front collimating apparatus (11), backscatter detector array (20) and thereafter collimating apparatus (18) are arranged on before sense channel in rack (23), and the backward compton scattering bundle (17) that backscatter detector array (20) and tested article penetrate forms the geometry structure of backward scattering measurement and imaging,
Radiation shield (24) is provided with between backscatter detector array (20) and transmitted X-ray beam;
At ray exit portal, controlled leafy smooth hurdle (19) is installed;
Whole Measurement & Control shares an industrial computer (10);
Below after sense channel in rack (22) is provided with linear transmission detector array data processing plate and USB output interface (7), and the below before sense channel in rack (23) is provided with backscatter detector array data disposable plates and USB output interface (8).
2. human body detecting device as claimed in claim 1, it is characterized in that: described linear transmission detector array (16) is outside equipped with linear transmission detector array shielding box (26), is outside equipped with backscatter detector shielding box (27) at backscatter detector array (20).
3. human body detecting device as claimed in claim 1, is characterized in that: described x-ray source (12) is 100W low energy X ray machine.
4. human body detecting device as claimed in claim 1, is characterized in that: described industrial computer (10) be arranged on plant bottom case (5) upper, to be positioned at before control desk (29) and sense channel between rack (23).
5. human body detecting device as claimed in claim 1, it is characterized in that: described backscatter detector array (20) is made up of small-sized silicon photoelectric diode and cesium iodide scintillation crystal, backscatter detector array and backward scattering measurement data acquisition and transmission system have international standard interface and standard-sized assembly; Described linear transmission detector array (16) makes homemade goods by miniature silicon photoelectric diode and cesium iodide scintillation crystal, and linear transmission detector array and transmission measurement data acquisition and transmission system have international standard interface and standard-sized assembly.
6. human body detecting device as claimed in claim 5, is characterized in that: described backscatter detector array (20) is of a size of 5.8 × 5.8mm by as number
2small-sized silicon photoelectric diode and cesium iodide scintillation crystal make, described linear transmission detector array (16) is of a size of 1.6 × 2.0mm by as number
2miniature silicon photoelectric diode and cesium iodide scintillation crystal make.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104267053A (en) * | 2014-09-30 | 2015-01-07 | 包微微 | Novel detector for liquid prohibited articles |
| CN107655906A (en) * | 2017-09-26 | 2018-02-02 | 同方威视技术股份有限公司 | Vehicle safe examination system, method and controller |
| CN107991326A (en) * | 2017-12-18 | 2018-05-04 | 公安部第三研究所 | Single so many energy radioscopy in source merges safe examination system with scattering |
| CN112965121B (en) * | 2021-02-03 | 2022-03-04 | 南京航空航天大学 | Radiation imaging security inspection system based on liquid metal random coding |
| CN114624785B (en) * | 2022-05-16 | 2022-08-19 | 天津速通科技有限公司 | Same light source setting method suitable for novel double-source mixed detection type channel type security inspection system |
| CN117562565A (en) * | 2022-08-08 | 2024-02-20 | 清华大学 | Radiation source mechanism and static computer tomography equipment |
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| US5642393A (en) * | 1995-09-26 | 1997-06-24 | Vivid Technologies, Inc. | Detecting contraband by employing interactive multiprobe tomography |
| CN102707324A (en) * | 2012-05-21 | 2012-10-03 | 貊梁 | Backscatter and transmission combined safety detector of X rays |
| CN203054242U (en) * | 2012-12-10 | 2013-07-10 | 四川大学 | Single-source low-energy X-ray Compton backscatter scanning and transmission scanning human body detection device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5642393A (en) * | 1995-09-26 | 1997-06-24 | Vivid Technologies, Inc. | Detecting contraband by employing interactive multiprobe tomography |
| CN102707324A (en) * | 2012-05-21 | 2012-10-03 | 貊梁 | Backscatter and transmission combined safety detector of X rays |
| CN203054242U (en) * | 2012-12-10 | 2013-07-10 | 四川大学 | Single-source low-energy X-ray Compton backscatter scanning and transmission scanning human body detection device |
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