CN103091720A - Vehicle scanning inspection device - Google Patents
Vehicle scanning inspection device Download PDFInfo
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- CN103091720A CN103091720A CN2011103326428A CN201110332642A CN103091720A CN 103091720 A CN103091720 A CN 103091720A CN 2011103326428 A CN2011103326428 A CN 2011103326428A CN 201110332642 A CN201110332642 A CN 201110332642A CN 103091720 A CN103091720 A CN 103091720A
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- vehicle
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- scanography
- signal
- radioactive source
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- 238000007689 inspection Methods 0.000 title abstract description 5
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 claims abstract description 51
- 239000013078 crystal Substances 0.000 claims abstract description 20
- 230000002285 radioactive effect Effects 0.000 claims abstract description 18
- 235000009518 sodium iodide Nutrition 0.000 claims abstract description 17
- 229910052716 thallium Inorganic materials 0.000 claims abstract description 14
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000007493 shaping process Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 239000003758 nuclear fuel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 9
- 238000003491 array Methods 0.000 abstract description 3
- 230000005251 gamma ray Effects 0.000 description 10
- 238000003384 imaging method Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000523 sample Substances 0.000 description 5
- GUTLYIVDDKVIGB-OUBTZVSYSA-N Cobalt-60 Chemical compound [60Co] GUTLYIVDDKVIGB-OUBTZVSYSA-N 0.000 description 4
- 229910052793 cadmium Inorganic materials 0.000 description 4
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 4
- XQPRBTXUXXVTKB-UHFFFAOYSA-M caesium iodide Chemical compound [I-].[Cs+] XQPRBTXUXXVTKB-UHFFFAOYSA-M 0.000 description 4
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000002594 fluoroscopy Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000003471 anti-radiation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- TVFDJXOCXUVLDH-RNFDNDRNSA-N cesium-137 Chemical compound [137Cs] TVFDJXOCXUVLDH-RNFDNDRNSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000001235 sensitizing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Measurement Of Radiation (AREA)
Abstract
The invention discloses a vehicle scanning inspection device, which is of a door frame structure and comprises a radioactive source, a shielding tank, a detector array, an electronics system, an image generating and processing system and a control system thereof, wherein the radioactive source is arranged in the shielding tank; the detector array is composed of sodium iodide (thallium) crystals and photomultiplier tubes coupled with the sodium iodide (thallium) crystals, and the detector array adopts a row of linear detector arrays. The invention provides a vehicle scanning inspection device of a door frame type mechanical structure module, which has low dosage, low cost and small occupied area.
Description
Technical field
The present invention relates to radiation scanning imaging detection technology field, particularly a kind of vehicle scanography device of low dosage.
Background technology
Over nearly 20 years, domestic and international vehicle safety check system used, the overwhelming majority all exists the excessive problem of radiogenic dosage, no matter is with cobalt-60 gamma ray radiator or makes radiographic source with electron accelerator, is not always the case.comprise German Heyman company (Heimann Co.), British Aerospace PLC (British Aerospace Co.), France Si Lunbeixie company (Schlumberger Co), the L3 company of the U.S., OSI company, Japan heavy industry Co., Ltd. and company of Tsing Hua Tong Fang, Beijing Hua Lixing company, the special company of Beijing Esso, Beijing one is led to company, the equipment of the production of above company roughly situation is substantially like this, radioactive dosage is all too large, bring thus floor area and floor area of building too large, the dose protection difficulty, installation and maintenance inconvenience, its basic reason is that they use the electric current ratio juris, simulating signal is changed through ADC, become digital signal, synthetic image.Because receive the detector element of ray, no small dark current is arranged generally.The signal that the ray that radiographic source is too launched produces in detector is too little, fluctuation less than detector dark current, be that signal is submerged in noise, only have with stronger radiographic source, produce strong current signal in detector, average current just can go on record during obviously greater than the fluctuation of dark current, carries out analog to digital conversion, generate gray level image, the shortcoming of general radial imaging electricity consumption flow imaging method that Here it is.for example, the Chinese invention patent instructions of the CN1160557C that on August 4th, 2004 was announced discloses a kind of 60Co γ-rays source-cesium iodide or cadmium tungstate detector array container inspectino apparatus, cesium iodide in this equipment or cadmium tungstate detector array are comprised of silicon photoelectric diode and the electronic circuit of a plurality of cesium iodides or cadmium tungstate twinkling crystal and coupling with it, this structure is due to the coupled structure that adopts cesium iodide or cadmium tungstate twinkling crystal and silicon photoelectric diode, therefore require the ray that radiographic source sends to reach the requirement that some strength could satisfy this structure, the dosage of this device radioactive source is up to 300 Curie, caused radioactive dosage excessive, can not be used for personnel's inspection.In addition, equipment volume is huge, and installation and environment for use are had special requirement, equipment transhipment inconvenience.
In several years after 911, SAIC company cobalt-60 (gamma ray projector) and sodium iodide with 0.75 Curie under the subsidy of U.S. government of the U.S. makes up with photomultiplier, low dosage, and use is counted imaging.The sodium iodide scintillation crystal sectional dimension of using is 28mm * 28mm, with two row's probes.The probe linear array is perpendicular to the ground, and desired height is very high, and probe quantity used is very large, and price is more expensive.
The applicant had also once developed a kind of device for vehicle detection, this device is the pick-up unit of low dosage, this device caesium-137 γ source or cobalt-60 gamma ray radiator, but this device is applicable to the dolly inspection, inadequate to the cart penetration power, and, this device cesium iodide-photodiode, its counting rate is lower, and contrast sensitivity is relatively poor.
Summary of the invention
The present invention has overcome deficiency of the prior art, and the vehicle scanography device of a kind of low dosage, cost is few, floor area is little door case type physical construction module is provided.
In order to solve the problems of the technologies described above, the present invention is achieved through the following technical solutions:
A kind of vehicle scanography device, this device is the door case type structure, it comprises radioactive source and cask flask, detector array, electronic system, image generation and disposal system and control system thereof, radioactive source is placed in cask flask, described electronic system is comprised of γ photon signal wave-shaping circuit, data acquisition card and industrial computer, key is, cask flask is outside equipped with ray collimator; Described detector array is classified the detector array of the photomultiplier composition of sodium iodide (thallium) crystal and coupling with it as, and detector array adopts row's linear photodetector array.Be provided with independently collimating apparatus around every group of detector.
The present invention is all right:
Described radioactive source adopts 0.8 Curie's cobalt source.Described carrying shield outlet ray collimator width is 4mm.Described control system is computing machine, control box, infrared emission device, electromagnet controller, electromagnet, video camera composition.Add shield after described door case type support.Described cask flask is that the depleted nuclear fuel leading is made, stainless steel outer packed involucrum.The length of the sodium iodide in described detector array (thallium) crystal is 85mm, and diameter of section is 27mm.
Compared with prior art, the invention has the beneficial effects as follows:
Detector array of the present invention adopts the fit structure of single sodium iodide (thallium) crystal and photomultiplier, the current method that before not re-using, checkout facility is habitually practised, but adopted the method for γ photon counting, Direct Digital is extracted the real-time fluoroscopy images of object, greatly reduce radiogenic dosage, simultaneously the present invention adopts again row's detector array to take a sample, when saving cost further reduction personnel by the time suffered dosage.The present invention adopts the door case type structure, makes radioactive source have larger ray outgoing subtended angle (reach 85 degree), and detector array is to radiogenic near distance, is examined counter when tall and big, has reduced the dead angle that checks.Simultaneously install shield additional after support, removed the anti-radiation building measure of equipment from, can be contained in any scene, guaranteed the safety of personnel and environment.
Description of drawings
The structural representation of Fig. 1 device
The schematic top plan view of Fig. 2 device
Fig. 3 detector array signal system block diagram
The circuit theory diagrams that Fig. 4 detector array column signal is processed
1 cask flask, 2 ray collimators, 3 electromagnet, 4 detector arrays, 5 γ photon signal wave-shaping circuits, 6 computing machines, 7 control boxs, 8 industrial computers, 9 infrared emission devices, 10 electromagnet controllers, 11 video cameras, 12 shields, 13 radioactive sources, 14 supports, 15 columns
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail:
A kind of vehicle safety check scanography system as shown in Figure 1, it comprises radioactive source 13 and the cask flask 1 thereof that is positioned at road one side, the detector array 4 of road opposite side and the electronic system that is formed by γ photon signal wave-shaping circuit 5, data acquisition card and industrial computer 8, and generated and disposal system by the image that foreground computing machine 6 forms; With by control box 7, the red outer automatic control system that emitter 9, electromagnet controller 10, computing machine 6, video camera 11, electromagnet 3 etc. are formed; Described detector array 4 is the detector array that the photomultiplier of sodium iodide (thallium) crystal and coupling with it forms.For the minimizing personnel by the time suffered dosage, detector array 4 adopts single linear photodetector arrays.Wherein sodium iodide (thallium) crystal is right cylinder, length is 85mm, diameter is 27mm, radioactive source 13 adopts 0.8 Curie's cobalt-60γray source, and is placed in cask flask 1, and cask flask 1 is the automatic switch cask flask, this container seals fully, 4mm is wide, the γ fan-beam delivery outlet of 85 ° of subtended angle automatic switches but only leave, and this cask flask 1 is made by the depleted nuclear fuel leading, stainless steel outer packed involucrum.Cask flask 1 slit place is provided with the wide ray collimator of 4mm 2, allows ray according to direction and the angular emission set.
Detector array 4
Detector array is classified sodium iodide (thallium) crystal as and is coordinated with photomultiplier, is used for catching the γ photon that transmission is come, and this is a kind of cooperation of the best, and the present invention adopts single row detector array 4, greatly provides cost savings, and has reduced simultaneously dosage.Be provided with independently collimating apparatus around every group of detector.
Sodium iodide (thallium) crystal and photomultiplier all need strictly to select, and ensure the quality of products, and the requirement of energy resolution is general, and concerning the 662keV gamma-rays, about 8% left and right gets final product.The length of cesium iodide (thallium) scintillation crystal determined gamma-ray detection efficiency, and selected detection efficiency is 80% left and right, and the length of corresponding sodium iodide (thallium) scintillation crystal is 85mm, and the cross section is Φ 27mm.Within each sample period, in the situation that the γ photon that should receive about 3000 left and right without any the end face of each scintillation crystal of object blocks (also referred to as zero load) is good.Sodium iodide (thallium) scintillation crystal is during by the γ photon irradiation, can produce the light wave that centre wavelength is 420nm, just in time drop in the light wave sensitizing range of photomultiplier, so detection efficiency be higher, select the Dc bias of about 700V, at the Ping Qu of the plateau curve of photomultiplier.
Electronic system
As shown in Figure 3, in the present embodiment, detector array 4 is totally 24 groups, every group of 8 detectors, and totally 192 detectors, being aligned is arranged on the door case type support.In 8 road γ photon signal wave-shaping circuits 5 of every group of detector access, through integration, voltage ratio with moulding after, every two group of 16 road signal is by a line collecting plate, signal is transferred in data acquisition card, after data acquisition card continues 2 group of 16 road set of signals become 4 group of 32 road signal, in the signal-processing board card of input industrial computer 8, carry out counting and the processing of signal.Have 8 signal-processing board cards, 192 road signals are carried out signal to be processed, the result that signal is processed is communicated in the foreground computing machine 6 of equipment user, communicates with image software in foreground computing machine 6, and image generates with disposal system and carries out computing and imaging.
Circuit theory diagrams as shown in Figure 4 after passing through the integration of the integrator that is comprised of integrated transporting discharging OP37 and electric capacity by detector signal out, become voltage signal with photo-signal.Voltage signal through the screening of the threshold value of over-voltage comparator LM311, is sent into after the elimination noise voltage in monostalbe trigger CD74HC221 again, through its monostable trigger, finally becomes the digital signal signal that can be identified by digital circuit of rect.p..Then one-channel signal is through constantly integrated and transmission, finally sends in the signal-processing board card take 32 road signals as one the tunnel, sticks into the horizontal pulse counting by signal-processing board, and data are sent in foreground computing machine 6 by industrial computer 8.Foreground computing machine 6 carries out image according to the step-by-step counting data of per pass and processes computing, and carries out the image demonstration according to operation result.
Image generates and disposal system
Described image generates with disposal system the count pulse of single photon, constantly send into the data counter in industrial computer 8 within the time in sampling period, as raw data, constantly input foreground computing machine 6 by industrial computer 8 interfaces, be used for generating original-gray image.Generate original-gray image through the deduction background foreground computing machine 6 is interior, then pass through the processing such as digital equalising, generate formal image, then processed by image processing program.The edge that comprises image strengthens, contrast strengthens, pseudo-colours etc.Also comprise the multi-level independent processing of region-of-interest arbitrarily in general image, in order to carry out more careful observation analysis, be different from other ZOOM image processing system.
Control system
In whole design, the control system of the present embodiment adopts automatic control system, and the overall process that detects vehicle is carried out automatically controlling and monitoring, automatic control system is indispensable.employing classification branch controls, by principal computer (being foreground computing machine 6), programmable logic controller PLC (in control box 7), dose measurement and infrared emission device 9, the electromagnet controller 10 of carrying shield, video camera 11 and temperature skill, hygronom, the compositions such as dosemeter, be mainly used in control and the record of vehicle entrance, automatically the opening and close of radioactive source 13, the detection of each position dosage, survey temperature in framework, the control of humidity, and the overall process that detects vehicle is carried out automatically controlling and monitoring, guarantee carrying out smoothly of personal security and testing, the unified of system's each several part work coordinated.
The using method of the present embodiment is as follows:
The concrete use step of this device is:
1. to this device energising, NaI crystal counter array (gamma-ray detector array) 4 and electronics circuit just are in the state of continuous collection and signal shaping, counting.The operator selects " calibration " on foreground computing machine 6 imagings control softwares, at this moment foreground computing machine 6 can be to industrial computer 8 peeks, and fetch data is as sample-out count at this moment.
2. when having vehicle to pass through, container carrier as shown in Figure 1 is during by this device, 2m place before support 14 themes, and because lorry has blocked infrared emission device 9, infrared emission device 9 can send a signal to control box 7, and representing has passenger vehicle to pass through.
3. after control box 7 is received the signal that infrared emission device 9 transmits.Can send a signal to electromagnet controller 10, electromagnet controller 10 powers on to electromagnet 3 after receiving signal, produce magnetic force after electromagnet 3 energisings, attract the device of the placement radioactive source 13 in cask flask 1 to arrive the position of ray collimator 2, the slit that gamma ray therefore can be by ray collimator 2 by the angular emission of design out.Meanwhile control box 7 is sent a signal to foreground computing machine 6, after foreground computing machine 6 is received the signal that control box 7 sends, imaging software begins " scanning " state, namely just gets every a period of time of setting the gamma ray count that one group of NaI crystal counter array 4 detects from industrial computer 8.Because due to van different parts article density, thickness difference, therefore different to the degree of absorption of gamma ray, the signal power of detector output is also different, be that the counting that is arranged on the diverse location of support 14 of detector array 4 is different, the imaging software of foreground computing machine 6 according to these different countings that collect, carries out data operation and imaging.Foreground computing machine 6 also gathers outward appearance and the license plate image by the van of video camera 11 transmission simultaneously, to back up.
4. van is whole by after support 14, and after namely entire scan was completed, the infrared emission device 9 that is arranged on support 14 another sides can be sent another signal to control box 7, and expression van integral body passes through.After receiving this signal, 7 pairs of electromagnet controllers 10 of control box are sent signal, 3 outages of 10 pairs of electromagnet of electromagnet controller.The in-built source apparatus of cask flask 1 is resetted by back-moving spring, and radioactive source 13 is regained from ray collimator 2 slits, does not have this moment gamma ray to penetrate.Control box 7 is sent signal to foreground computing machine 6 simultaneously, after foreground computing machine 6 is received signal, the gamma ray fluoroscopy images of computing imaging before and data thereof and collection are carried out unified packing operation from the van outward appearance license plate image of video camera 11, the data and the image file that pass through as this vehicle deposit in the file of computing machine 6 appointments, in order to calling.
Claims (7)
1. vehicle scanography device, this device is the door case type structure, it comprises radioactive source and cask flask, detector array, electronic system, image generation and disposal system and control system thereof, radioactive source is placed in cask flask, described electronic system is comprised of γ photon signal wave-shaping circuit, data acquisition card and industrial computer, it is characterized in that, cask flask is outside equipped with ray collimator; Described detector array is classified the detector array of the photomultiplier composition of sodium iodide (thallium) crystal and coupling with it as, and detector array adopts the single row configuration that adds collimation.
2. a kind of vehicle scanography device according to claim 1, is characterized in that, described radioactive source adopts 0.8 Curie's cobalt source.
3. a kind of vehicle scanography device according to claim 1, is characterized in that, described ray collimator is the 4mm ray collimator.
4. a kind of vehicle scanography device according to claim 1, is characterized in that, described control system is computing machine, control box, infrared emission device, electromagnet controller, electromagnet, video camera composition.
5. a kind of vehicle scanography device according to claim 1, is characterized in that, adds shield after described door case type support.
6. a kind of vehicle scanography device according to claim 1, is characterized in that, described cask flask is that the depleted nuclear fuel leading is made, stainless steel outer packed involucrum.
7. a kind of vehicle scanography device according to claim 1, is characterized in that, the length of the sodium iodide in described detector array (thallium) crystal is 85mm, and diameter of section is 27mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103326428A CN103091720A (en) | 2011-10-28 | 2011-10-28 | Vehicle scanning inspection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103326428A CN103091720A (en) | 2011-10-28 | 2011-10-28 | Vehicle scanning inspection device |
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| Publication Number | Publication Date |
|---|---|
| CN103091720A true CN103091720A (en) | 2013-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103326428A Pending CN103091720A (en) | 2011-10-28 | 2011-10-28 | Vehicle scanning inspection device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105604353A (en) * | 2016-02-22 | 2016-05-25 | 西安航天神舟建筑设计院有限公司 | X-ray radiation shielding building |
| CN106153091A (en) * | 2016-08-30 | 2016-11-23 | 北京华力兴科技发展有限责任公司 | Various dimensions vehicle information display |
| CN112346137A (en) * | 2019-08-09 | 2021-02-09 | 同方威视技术股份有限公司 | Inspection station and inspection method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101329283B (en) * | 2007-06-21 | 2011-06-08 | 清华大学 | Method and system for detecting prohibited products of photo neutron-X ray |
| CN202256707U (en) * | 2011-10-28 | 2012-05-30 | 中国原子能科学研究院 | Vehicle scanning and inspecting device |
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2011
- 2011-10-28 CN CN2011103326428A patent/CN103091720A/en active Pending
Patent Citations (2)
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| CN101329283B (en) * | 2007-06-21 | 2011-06-08 | 清华大学 | Method and system for detecting prohibited products of photo neutron-X ray |
| CN202256707U (en) * | 2011-10-28 | 2012-05-30 | 中国原子能科学研究院 | Vehicle scanning and inspecting device |
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| 薛程瑞等: "检查小卧车的低剂量γ射线成像系统", 《中国核科学技术进展报告（第一卷）核技术工业应用分卷》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105604353A (en) * | 2016-02-22 | 2016-05-25 | 西安航天神舟建筑设计院有限公司 | X-ray radiation shielding building |
| CN105604353B (en) * | 2016-02-22 | 2019-02-15 | 西安航天神舟建筑设计院有限公司 | X-ray radiation shields building |
| CN106153091A (en) * | 2016-08-30 | 2016-11-23 | 北京华力兴科技发展有限责任公司 | Various dimensions vehicle information display |
| CN112346137A (en) * | 2019-08-09 | 2021-02-09 | 同方威视技术股份有限公司 | Inspection station and inspection method |
| CN112346137B (en) * | 2019-08-09 | 2022-11-11 | 同方威视技术股份有限公司 | Inspection station and inspection method |
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Application publication date: 20130508 |