CN102621587A - Portable X-ray back-scattering imaging detector - Google Patents
Portable X-ray back-scattering imaging detector Download PDFInfo
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- CN102621587A CN102621587A CN2012100827104A CN201210082710A CN102621587A CN 102621587 A CN102621587 A CN 102621587A CN 2012100827104 A CN2012100827104 A CN 2012100827104A CN 201210082710 A CN201210082710 A CN 201210082710A CN 102621587 A CN102621587 A CN 102621587A
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Abstract
The invention discloses a portable X-ray back-scattering imaging detector, which belongs to the technical field of non-destructive detection and safety defense detection equipment. The detector comprises a portable X-radiation source, an encoded pore plate, a back-scattering X-ray imaging detector, a visible image probe, a computer image rebuilding and displaying system, an X-ray source shielding material and a back-scattering X-ray range limiter. In the detector, the encoded pore plate which is encoded according to a certain rule is adopted, i.e., a plurality of aperture images are laminated, and an image formed by laminating the plurality of aperture images is recovered and rebuilt into a real back-scattering radiation image formed by single apertures, so that the defects of complex equipment structure, tremendous equipment size and small information amount of a flying-spot scanning technology and the like caused by an X-ray lens technology are overcome effectively. The portable X-ray back-scattering imaging detector has the advantages of simple principle, large information amount, convenience for processing and manufacturing, light weight, low price and the like, and can be manufactured into portable equipment.
Description
Technical field
The present invention relates to a kind of X ray checkout equipment, belong to Non-Destructive Testing and safety guard checkout equipment technical field.
Background technology
The characteristics of X ray are that penetration power is strong; X ray backscattering imaging detector utilizes these characteristics exactly; Let X ray penetrate people's housing materials such as clothing; Directive is hidden in the object of wrappage back such as clothing, and X ray produces different backscattering on these objects, measure position, the intensity of these different backscattering rays; Just can provide the information such as size, shape and position of wrappage such as being hidden in clothing back objects (detected object) and provide its image, thereby judge its whether prohibited items.Just can detect whether foreign matter is arranged in the body of wall to X ray directive wall.Directive ground can check that whether to have land mine to be embedded in underground or the like.The equipment of realizing this technology has dual mode at present; The one, the flying-spot scanner mode, it requires the scanning equipment, and X ray is collimated into a pencil; It is moved all scans object to be detected one time; This equipment size is big, and weight is also big, has only the U.S. to have several companies such as AS&E and Rapiscan etc. to produce at present; Another kind is the examining object that shines certain area with the cone type X-ray bundle; Utilize the X ray lens technologies that seized object backscattering ray need not scanned; Polaroid, detect the backscattering image of the object to be detected of certain area, the information of hiding contraband goods behind the detected material surface is provided.The present U.S. of this equipment Physical Optics Corp. produces a kind of product ' LEXID ', have simple, light and handy, and characteristics that are easy to carry about with one, but the X ray lens technologies is complicated, is difficult for making, price is costliness also.
Summary of the invention
The purpose of this invention is to provide a kind of portable X ray backscattering imaging detector; Promptly adopt the coded aperture imaging technology; Restoration and reconstruction go out the true backscattering image that single aperture forms, thereby provide a kind of structure simple relatively, light and handy, and lower-cost X ray backscattering imaging detector.
Technical scheme of the present invention is following:
Comprise portable x-ray source, coding orifice plate, backscattering x-ray imaging detector, visible images detector, computer picture reconstruction and display system, x-ray source shielding material and backscattering X ray scope delimiter; Described radioscopic image detector is made up of backscattering X ray-visible images converter, image Transmission Fibers plate and visible images amplifier successively, and the three closely contacts; Described coding orifice plate and backscattering x-ray imaging detector are placed in the portable complete machine screening housing; Said backscattering X ray scope delimiter is arranged on said notch front edge of board, and places the outside of portable complete machine casing shielding; X-ray source sends the seized object of X ray directive; Seized object backscattering X ray is penetrated on backscattering X ray-visible images converter through the coding orifice plate and is generated visible images; Again after image Transmission Fibers plate and visible images amplifier amplify visible images; Gather by the visible images detector, then the image information of gathering is sent into computer picture and rebuild and display system, demonstrate checking matter volume scattering thing.
Coding orifice plate of the present invention adopts two-dimensional encoded casement plate, and the hole on the described coding orifice plate is looping pit, square opening or circular port.The coding orifice plate thin plate that metal or its alloy rolling become of attaching most importance to, its thickness is less than 1.0 millimeters, and the area in hole accounts for 40%～55% of whole coding orifice plate area.
Backscattering X ray scope delimiter of the present invention is made by shielding material, and it is shaped as taper shape or four stupefied tapers.
X-ray source employing high pressure of the present invention is 30～140 kilovolts a low power X-ray generator, or the pulsed X-ray generator of cold cathode.
The present invention has the following advantages and the high-lighting effect: the present invention is owing to adopted a coding orifice plate of coding according to certain rules; Be about to a plurality of pinhole imaging system stacks, the image restoration and reconstruction with a plurality of pinhole imaging system stacks go out the true backscattering image that single aperture forms again.Both utilize a plurality of pinhole imaging system stacks to improve the quantity of information of gathering, and utilized image reconstruction technique to obtain to have the image of certain mass again; Effectively overcome the huge and quantity of information of the complicated equipment of device structure that the X ray lens technologies brings defective such as less with the flying-spot scanner technology; Have principle simple, contain much information, processing and fabricating is convenient, weight is skilful and characteristics such as low price, can process portable equipment.
Description of drawings
Fig. 1 is a theory structure synoptic diagram of the present invention.
Fig. 2 moves towards synoptic diagram for backscattering x-ray imaging detector and ray.
Fig. 3 is for adopting the shape synoptic diagram of the coding orifice plate that improves the redundant digit group mode.
Among the figure: the 1-X radiographic source; The cone type X-ray bundle that 2-penetrates; 3-irradiated object or people; 4-backscattering X ray; The 5-orifice plate of encoding; 6-backscattering x-ray imaging; 7-backscattering x-ray imaging detector; The 8-computer picture is rebuild and display system; 9-X radiographic source shielding material; 10-image Transmission Fibers plate; 11-visible images amplifier; 12-visible images detector; 13-backscattering X ray-visible images converter; The shielding of 14-portable complete machine casing; 15-backscattering X ray scope delimiter.
Embodiment
Below in conjunction with accompanying drawing principle of the present invention, structure and the course of work are done further explanation.
A kind of portable X ray backscattering imaging detector (as shown in Figure 1) provided by the invention, this detector comprises portable x-ray source 1, coding orifice plate 5, backscattering x-ray imaging detector 7, visible images detector 12, computer picture reconstruction and display system 8, x-ray source shielding material 9 and backscattering X ray scope delimiter 15; Described radioscopic image detector 7 is made up of backscattering X ray-visible images converter 13, image Transmission Fibers plate 10 and visible images amplifier 11 successively, and backscattering X ray-visible images converter 13, image Transmission Fibers plate 10 and visible images amplifier 11 threes closely contact; Described coding orifice plate 5 is placed in the portable complete machine screening housing 14 with backscattering x-ray imaging detector 7; Said backscattering X ray scope delimiter 15 is arranged on said coding orifice plate 5 front ends, and places the outside of portable complete machine casing shielding 14.
X-ray source sends X ray; The seized object 3 of cone type X-ray bundle 2 directives through 9 ejaculations of x-ray source shielding material; Seized object backscattering X ray 4 is limited backscattering X ray scope delimiter 15; Through coding orifice plate 5 with the backscattering radial imaging of seized object on backscattering X ray-visible images converter 13; Generate visible images; The visible images converter is made up of cesium iodide or GOS, after cesium iodide or GOS convert radioscopic image to visible images, by image Transmission Fibers plate 10 visible light is connected to the visible images amplifier 11 (claiming image intensifier again) that microchannel plate constitutes image information is amplified;, obtain behind the image reconstruction on the display that real backscattering image is presented at computing machine (as shown in Figure 2) with the image information collection of gained and send into that computer picture is rebuild and display system 8 is handled by visible images detector 12 (CCD or CMOS).
It is 30～140 kilovolts low power X-ray generator (less than 500 watts) that x-ray source 1 should adopt high pressure, or the pulsed X-ray generator of cold cathode.Because its little power consumption is in light weight, under some particular case, x-ray source can Offhost, is carried by the operation assistant, is more convenient for like this detecting.Then should increase ray energy if any specific (special) requirements (as detecting the situation of thicker object back).The shielding material 9 of x-ray source generally selects for use the sheet lead of about 2-6 millimeters thick to get final product (look and select for use the X ray energy to decide); Backscattering X ray scope delimiter 15 is processed by shielding material, can be processed to taper shape or four stupefied tapers, to limit the backscattering X ray scope of gathering (promptly confirming to gather the visual field size of dispersion image).
Portable complete machine casing shielding 14 should be processed by shielding material, is used for shielding backscattering x-ray imaging detector 7, prevents not inject image detector through the backscattering X ray of coding orifice plate, forms spurious signal.
The coding orifice plate is a kind of widely used two-dimensional encoded casement plate of being processed by various coding modes, and normally used pattern is: improve the redundant digit group mode, be called for short MURA.Fig. 3 is that a length of side is the square coding templet of prime number (31X31) for adopting the shape synoptic diagram of the coding orifice plate that improves the redundant digit group mode, and the black and white part of template is made up of hole and plate material, by the matrix element A of 0,1 formation
I, j, the structure structure of decision template, matrix A
I, jThe formation rule be:
I wherein, j are respectively 0 to p-1 integer.Q is to be that the secondary of mould is remaining with p, Cq=1 otherwise Cq=-1, A
I, jBe matrix difference indication window and the mould material entity that constitutes by 0,1.
The coding orifice plate can have the hole of different shape, and like looping pit or square opening etc., but the size in hole, shape and layout all will have certain rules, to guarantee the quality of image reconstruction.The coding orifice plate is to adopt heavy metal material, and like the thin plate that high atomic number, high-density metal or their alloy rollings such as tungsten, tantalum, gold and lead become, its thickness should be less than 1.0 millimeters.The area in hole should account for 40～55% of orifice plate area on the coding orifice plate, could guarantee that like this quantity of information of gathering is enough big, and the quality of image is just guaranteed.
Claims (5)
1. a portable X ray backscattering imaging detector comprises portable x-ray source (1), coding orifice plate (5), backscattering x-ray imaging detector (7), visible images detector (12), computer picture reconstruction and display system (8), x-ray source shielding material (9) and backscattering X ray scope delimiter (15); Described radioscopic image detector (7) is made up of backscattering X ray-visible images converter (13), image Transmission Fibers plate (10) and visible images amplifier (11) successively, and the three closely contacts; Described coding orifice plate (5) and backscattering x-ray imaging detector (7) are placed in the portable complete machine screening housing (14); Said backscattering X ray scope delimiter, (15) are arranged on coding orifice plate (5) front end, and place the outside of portable complete machine casing shielding 14; X-ray source sends the seized object of X ray directive (3); Seized object backscattering X ray (4) is penetrated at backscattering X ray-visible images converter (13) through coding orifice plate (5) and is gone up the generation visible images; Again after image Transmission Fibers plate (10) and visible images amplifier (11) amplify visible images; Gather by visible images detector (12), then the image information of gathering is sent into computer picture and rebuild and display system (8), demonstrate checking matter volume scattering thing.
2. according to the described a kind of portable X ray backscattering imaging detector of claim 1, it is characterized in that: described coding orifice plate adopts two-dimensional encoded casement plate, and the hole on the described coding orifice plate is looping pit or square opening.
3. according to claim 1 or 2 described a kind of portable X ray backscattering imaging detectors; It is characterized in that: the coding orifice plate thin plate that metal or its alloy rolling become of attaching most importance to; Its thickness is less than 1.0 millimeters, and the area in hole accounts for 40%～55% of whole coding orifice plate area.
4. according to the described a kind of portable X ray backscattering imaging detector of claim 1, it is characterized in that: described backscattering X ray scope delimiter is made by shielding material, and it is shaped as taper shape or four stupefied tapers.
5. according to the described a kind of portable X ray backscattering imaging detector of claim 1, it is characterized in that: it is the low power X-ray generator of 30-140 kilovolt that described x-ray source adopts high pressure, or the pulsed X-ray generator of cold cathode.
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| CN201210082710.4A CN102621587B (en) | 2012-03-26 | 2012-03-26 | Portable X-ray back-scattering imaging detector |
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| CN201210082710.4A CN102621587B (en) | 2012-03-26 | 2012-03-26 | Portable X-ray back-scattering imaging detector |
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| CN102621587A true CN102621587A (en) | 2012-08-01 |
| CN102621587B CN102621587B (en) | 2015-07-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983654A (en) * | 2014-05-26 | 2014-08-13 | 中国科学院高能物理研究所 | Ray scattering imaging system based on aperture coding technique |
| CN109893155A (en) * | 2019-03-05 | 2019-06-18 | 中国辐射防护研究院 | A kind of notch method for manufacturing collimator for gamma camera |
| CN110163150A (en) * | 2019-05-21 | 2019-08-23 | 上海天马微电子有限公司 | A kind of fingerprint identification method, display device and computer readable storage medium |
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| CN1749742A (en) * | 2005-07-15 | 2006-03-22 | 北京中盾安民分析技术有限公司 | Portable double energy X-ray detector |
| CN202600160U (en) * | 2012-03-26 | 2012-12-12 | 貊梁 | Portable X ray inverse scattering imaging detector |
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2012
- 2012-03-26 CN CN201210082710.4A patent/CN102621587B/en active Active
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| CN1749742A (en) * | 2005-07-15 | 2006-03-22 | 北京中盾安民分析技术有限公司 | Portable double energy X-ray detector |
| CN202600160U (en) * | 2012-03-26 | 2012-12-12 | 貊梁 | Portable X ray inverse scattering imaging detector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983654A (en) * | 2014-05-26 | 2014-08-13 | 中国科学院高能物理研究所 | Ray scattering imaging system based on aperture coding technique |
| CN103983654B (en) * | 2014-05-26 | 2016-09-14 | 中国科学院高能物理研究所 | A kind of ray scattering imaging system based on aperture coding techniques |
| CN109893155A (en) * | 2019-03-05 | 2019-06-18 | 中国辐射防护研究院 | A kind of notch method for manufacturing collimator for gamma camera |
| CN110163150A (en) * | 2019-05-21 | 2019-08-23 | 上海天马微电子有限公司 | A kind of fingerprint identification method, display device and computer readable storage medium |
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| CN102621587B (en) | 2015-07-15 |
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