CN2262708Y - Compton back scattering scanner - Google Patents
Compton back scattering scanner Download PDFInfo
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- CN2262708Y CN2262708Y CN 95240569 CN95240569U CN2262708Y CN 2262708 Y CN2262708 Y CN 2262708Y CN 95240569 CN95240569 CN 95240569 CN 95240569 U CN95240569 U CN 95240569U CN 2262708 Y CN2262708 Y CN 2262708Y
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Abstract
The utility model relates to a Compton back scattering scanner. A scanning motion mechanical device of the utility model is mainly composed of a scanning head and a combined type lifting appliance. The utility model is characterized in that the miniaturized scanning head with compact structure is composed of a source cask flask, a front collimating device, a back collimating device, a detector, a probe shield sleeve, a stepping motor, an upper and a lower layers of pulling plates, a feed screw, a guide rail, etc., and the scanning head can do the two-dimensional scanning motion longitudinally and laterally; the scanning head which is matched with the combined type lifting appliance can do the third-dimensional lifting scanning motion along the two parallel guide posts by the stepping motor, the feed screw, etc. The utility model has the advantages of good reliability and high resolution. The utility model can nondestructively evaluate large sized objects, light objects, thin objects, multilayer objects, and objects in complicated geometric shapes.
Description
The utility model relates to a kind of compton backscattering scanning machine (CBS-Compton BackscatterScanning), and it is based on the ray image device of compton effect,scattering in photon and the matter interaction.It is widely used in the Non-Destructive Testing and the Nondestructive Evaluation of industrial products, the explosive of Civil Aviation Airport, railway station and each port, customs and the automatic detection of drugs.
Transmission-type industrial computed tomography imaging (TICT-Transmission IndustrialComputed Tomography) device runs into many problems in actual applications, and CBS has the deficiency that a lot of characteristics can remedy TICT:
(1) contrast of .TICT inspected object defective is relevant with defect size, and the CBS detection is irrelevant with defect size approx, thereby the contrast of CBS detection defective is more much higher than the contrast of TICT.
(2) therefore the .TICT device is difficult to detect large-sized object because origin system and detector cloth are placed on the both sides of testee.And the origin system of CBS device and detector are positioned at the same side of measured object, therefore are not subjected to the restriction of measured object size.
(3). for gossamery object, the sensitivity of the remolding sensitivity TICT of CHS is much higher.Therefore, CBS can survey extremely thin planar disfigurement, even those defectives parallel with the thin plate direction.
(4) .TICT is applicable to the detection of symmetry object more, and image reconstruction algorithm can be handled the data of asymmetry object with limited projection (for example finite angle or limited looking), but this algorithm still has a lot of problems in actual applications.And CBS is point or alignment scanning, not only can but also can be parallel to profile scanning perpendicular to the object profile scanning, and therefore, CBS is applicable to the detection of object multilayer or complex geometry.
(5) the .TICT technology is suitable for the detection of high atomic number Z material, and CHS especially is suitable for the detection of low atomic number Z material.
(6) the TICT image reconstruction must be that projection number and ray have requirement with number to picture matrix by means of image reconstruction algorithm.And CBS must not pass through the image reconstruction stage, can directly line up the scattered photon counting that detects and promptly obtain image.
At present, the CBS device or the system of existing commercial Application in the world, the common issue with of existence is:
(1), adopt the CBS system of x-ray source, the volume and weight of device is big, support equipment is numerous and jumbled, the cost height effectively detects the degree of depth and is very limited.
(2), adopt the CBS system of gamma ray projector, the signal to noise ratio (S/N ratio) of device is low, detection speed is slow, the data processing technique complexity.In order to improve signal to noise ratio (S/N ratio), external all use very strong gamma ray projector (25 Curie for example
137More than Cs source and 10 Curie
60The Co source, 50～100 Curie's
192The Ir source), very thick screen layer, the collimating apparatus that hole dimension is big, detector that the energy resolution of multichannel is high (for example must work at low temperatures HpGe), biography device and array processor etc. are adopted in the detection that must have a lot of support equipments, so that device is big, Heavy Weight, and radsafe is relatively poor, cost an arm and a leg, and space and density resolution are not high.Like this, abroad still failing so far to produce can be for the gamma-rays compton backscattering scanning machine of small practical.
The purpose of this utility model provides a kind of energy and detects compton backscattering scanning machine large-scale, light, practicality thin, object multilayer, complex geometry.
Another purpose of the present utility model provides good, use gamma ray projector, the high-accuracy portable Kang Pu backward scattering scanning machine of the ratio of performance to price.
The utility model realizes that the above-mentioned purpose technical solution is:
The compton backscattering scanning machine, mainly by gamma ray projector and cask flask thereof, detection adopt biography system, scanning mechanism, unify image processing, display system etc. of control, department of computer science are formed automatically.It specifically is characterized as:
(1) angle between the direction (being the direction that the scattering beam enters detector) of direction of preceding collimating aperture (being the primary beam working direction) and back collimating aperture is the Compton scattering angle, when θ 〉=90 °, is called the compton backscattering angle.It is θ=135 ° that the utility model adopts the compton backscattering angle.Like this, gamma emitter and detector are all in the same side of measured object.
(2) the low-activity gamma emitter of employing medium energy: 1 Curie's
137Cs and 35 Curie's
192Ir.
(3) whole scanning motion mechanical hook-up is divided into scanner head and two parts of combined type lifting device.Scanner head comprises gamma emitter and cask flask thereof, preceding collimating apparatus and back collimating apparatus, and detector and bell housing thereof are divided into upper and lower two-layer planker, guide rail and leading screw.In scanner head, gamma emitter places the center of source cask flask, and source cask flask and preceding collimating apparatus link together and be installed in down on the planker, following planker is supported on lower floor's guide rail, and be connected with the lower floor leading screw, lower floor's leading screw is furnished with stepper motor, forms lower floor's movable machinery structure.Detector is inserted in the probe shield cover, and the probe shield cover links together with the back collimating apparatus and is installed on the planker, and last planker is supported on the guide rail of upper strata, and is connected with the upper strata leading screw, and the upper strata leading screw is furnished with stepper motor, forms upper strata movable machinery structure.Upper and lower two-layer movable machinery structure is formed scanner head compact conformation, miniaturization jointly, can do depth direction and laterally like this two-dimensional scan campaign: the source cask flask of collimating apparatus and the following planker, lower guideway and the leading screw that are installed together are that lower floor's movable machinery structure maintenance is motionless before being equipped with, and be inserted with the probe shield cover of detector and the back collimating apparatus that links together with it moving by step motor drive leading screw and last planker along upper rail, promptly have only upper strata movable machinery structure just can realize the depth direction scanning motion; The source cask flask of collimating apparatus is moved along lower guideway by step motor drive leading screw and following planker with the probe shield cover that is inserted with detector before being equipped with, and promptly has only lower floor's movable machinery structure just can realize the transversal scanning campaign.
(4) scanner head hangs on two parallel guide pillars with guide pin bushing by means of the overarm assembly of combined type lifting device, two parallel guide pillars are fixed by the base and the entablature of combined type lifting device, by back feet supplemental support, one end of leading screw is installed on the overarm assembly, and the other end is vertically by being fixed on the nut on the middle cross beam.It is elevating movement that scanner head is done third dimension scanning by step motor drive along two parallel guide pillars with leading screw by means of middle cross beam.
(5), realize the 3-D scanning motion of CBS system by means of switchable micro-processor controlled driving system of stepping motor.
(6) surveying the feature of adopting the biography system is: single channel or multichannel sodium iodide (NaI (tl)) detector and automatic spectral measurement analytic system are micro-processor controlled multichannel pulse scope-analyzer.The spectral measurement analytic system mainly is made up of linear amplifier, upper and lower threshold discriminator, analog to digital converter (ADC), microcomputer interface etc.
The utility model good reliability, the resolution height can carry out Nondestructive Evaluation to large-scale, light, thin, object multilayer, complex geometry.
Below in conjunction with an accompanying drawing and a preferred embodiment (LBD101 type high-accuracy portable CBS scanning machine) the utility model is described in further detail, the effect that makes the public further understand above-mentioned purpose of the present utility model and can reach, so that the public grasps technological means of the present utility model better, but the utility model is not limited by described embodiment.
Description of drawings:
Fig. 1 is the overall block-diagram of a kind of embodiment of the utility model;
Fig. 2 is the concrete scanning head structure and the two-dimensional scan campaign synoptic diagram of a kind of embodiment of the utility model;
Fig. 3 is the overall construction drawing of a kind of embodiment of the utility model;
Fig. 4 is the side view of the combined type lifting device of a kind of embodiment of the utility model.
The parts that label among each figure is represented are as follows:
1. radiation source
2. source cask flask
3. preceding collimating apparatus
4. collimating apparatus after
5.NaI (TL) detector
6. probe shield cover
7. linear amplifier
8. microcomputer multichannel analyzer
9. microcomputer interface
10. microcomputer
11. stepper motor driver
12. printer
13. display
14, high-low voltage power source
15, object to be detected
16, scanner head
17, combined type lifting device
18, the stepper motor of elevating movement
19, the guide rail of depth direction motion work is a upper rail
20, the guide rail of transverse movement gear train is a lower guideway
21, the base of jacking gear
22, the guide pillar of jacking gear
23, the overarm assembly of jacking gear
24, the guide pin bushing of jacking gear
25, the middle cross beam of jacking gear
26, the leading screw of jacking gear
27, the entablature of jacking gear
28, the back feet of jacking gear
29, the stepper motor of depth direction motion
30, the stepper motor of transverse movement
31, the detection volume in the measured object
32, nut
33, go up planker
34, following planker
35, upper strata leading screw
36, lower floor's leading screw
Embodiment:
Referring to Fig. 1, in the CBS scanning system, the gamma ray projector 1 that is contained in source cask flask 2 centers sends gamma-rays and incide certain small size 31 generation compton backscattering in the inspected object 15 behind preceding collimating apparatus 3 collimation.Scattered ray is received through the detector 5 that collimating apparatus 4 arrival later are inserted in the probe shield cover 6.The signal of detector 5 outputs is performed an analysis by microcomputer multichannel analyzer 8 through linear amplifier 7 backs, delivers to portable microcomputer 10 through microcomputer interface 9 again and carries out data processing, and its result is printed by printer 12 or shown by display 13.
Referring to Fig. 2, before being equipped with the source cask flask 2 of collimating apparatus 3 and gamma emitter 1 and be close to back collimating apparatus 4 ends, be inserted in detector 5 in the probe shield cover 6 all in the same side of testee.The source cask flask 2 of collimating apparatus 3 and the following planker 34 that is installed together thereof, lower guideway 20 and lower floor's leading screw 36 keep motionless before being equipped with, and be inserted with the probe shield cover 6 of detector 5 and the back collimating apparatus 4 that links together with it drives upper strata leading screws 35 by stepper motor 29 and last planker 33 moves along upper rail 19, realize the depth direction scanning motion.The source cask flask 2 of preceding collimating apparatus 3 is housed and is inserted with detector 5 and drives lower floor's leading screws 36 by stepper motor 30 and move along lower guideway 20, realize the transversal scanning campaign with following planker 34 with the probe shield cover 6 that back collimating apparatus 4 is joined.
Referring to Fig. 3, scanner head 16 hangs on two parallel guide pillars 22 by means of overarm assembly 23 that links together and guide pin bushing 24, two parallel guide pillars 22 are fixing by jacking gear base 21 and entablature 27, one end of leading screw 26 is installed on the overarm assembly, the other end is vertically by being fixed on middle cross beam 25 top nuts 32, stepper motor 18 drives leading screw 26 and moves up and down, and is being with scanner head 16 to move up and down along two parallel guide pillars 22, realizes the lifting scanning motion.
Referring to Fig. 4, when scanner head 16 when the combined type lifting device rises to more than 1 meter, use the back feet 28 of jacking gear, the stability when keeping the complete machine frame high.
Claims (2)
1, a kind of compton backscattering scanning machine, its scanning motion mechanical hook-up mainly is made up of scanner head (16) and combined type lifting device (17), the direction of its preceding collimating aperture is the Compton scattering angle with the angle together of the direction of back collimating aperture, be backward scattering during greater than 90 °, it is characterized in that it places gamma emitter (1) at the center of source cask flask (2), source cask flask (2) links together with preceding collimating apparatus (3) and is installed in down on the planker (34), following planker (34) is supported on lower floor's guide rail (20), and be connected with lower floor's leading screw (36), lower floor's leading screw (36) is furnished with stepper motor (30), form lower floor's movable machinery structure, detector (5) is inserted in the probe shield cover (6), probe shield cover (6) links together with back collimating apparatus (4), be installed on the planker (33), last planker (33) is supported on the upper rail (19), and be connected with upper strata leading screw (35), upper strata leading screw (35) is furnished with stepper motor (29), form upper strata movable machinery structure, on, two-layer movable machinery structure is formed compact conformation jointly down, the scanner head of miniaturization (16), can do depth direction and laterally two-dimensional scan campaign like this, scanner head (16) hangs on two parallel guide pillars (22) with guide pin bushing (24) by means of the overarm assembly (23) of combined type lifting device (17), two parallel guide pillars (22) are fixing by the base (21) and the entablature (27) of combined type lifting device, by back feet (28) supplemental support, one end of leading screw (26) is installed on the overarm assembly (23), vertically by being fixed on the nut (32) on the middle cross beam (25), it is elevating movement that scanner head (16) is done third dimension scanning by stepper motor (18) driving along two parallel guide pillars (22) with leading screw (26) by means of middle cross beam (25) to the other end.
2, a kind of compton backscattering scanning machine according to claim 1 is characterized in that selected compton backscattering angle is 135 °; Selected radiation source (1) is the low-activity gamma emitter of medium energy: 1 Curie
137Cs or 35 Curie's
192Ir.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95240569 CN2262708Y (en) | 1995-09-27 | 1995-09-27 | Compton back scattering scanner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95240569 CN2262708Y (en) | 1995-09-27 | 1995-09-27 | Compton back scattering scanner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2262708Y true CN2262708Y (en) | 1997-09-17 |
Family
ID=33882126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95240569 Expired - Fee Related CN2262708Y (en) | 1995-09-27 | 1995-09-27 | Compton back scattering scanner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2262708Y (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100387984C (en) * | 2004-11-12 | 2008-05-14 | 中国科学院武汉物理与数学研究所 | Pipe node welding sean ultrasonic detecting machine scanning device |
| CN100545641C (en) * | 2004-04-03 | 2009-09-30 | 宋世鹏 | A kind of ray detecting device |
| CN101852746A (en) * | 2010-06-29 | 2010-10-06 | 北京中油联自动化技术开发有限公司 | X-ray measuring device and measuring method of water content and gas content in multiphase flow |
| CN101887036A (en) * | 2010-04-27 | 2010-11-17 | 丹东奥龙射线仪器有限公司 | X-ray high-pressure tube fitting detecting platform |
| CN101718564B (en) * | 2009-11-17 | 2011-04-27 | 丹东奥龙射线仪器有限公司 | Main stand of multifunctional large-scale X-ray instrument |
| CN101183065B (en) * | 2006-11-13 | 2011-06-22 | 思姆菲舍尔科技公司 | Density measurement with gamma backscattering |
| CN102549413A (en) * | 2009-07-20 | 2012-07-04 | 原子能与替代能源委员会 | Method and device for identifying a material of an object |
| CN101382503B (en) * | 2007-09-06 | 2013-05-08 | 清华大学 | Adjusting device for installing ray generator |
| CN104161538A (en) * | 2014-08-27 | 2014-11-26 | 丁厚本 | Medical CT machine based on Compton backscatter scanning technology |
| CN106901771A (en) * | 2017-03-14 | 2017-06-30 | 丁厚本 | A kind of ray compton backscattering CT scan head and CT Scanner |
| CN107782752A (en) * | 2017-08-31 | 2018-03-09 | 中国核电工程有限公司 | A kind of welding line ray detector and its detection method |
-
1995
- 1995-09-27 CN CN 95240569 patent/CN2262708Y/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100545641C (en) * | 2004-04-03 | 2009-09-30 | 宋世鹏 | A kind of ray detecting device |
| CN100387984C (en) * | 2004-11-12 | 2008-05-14 | 中国科学院武汉物理与数学研究所 | Pipe node welding sean ultrasonic detecting machine scanning device |
| CN101183065B (en) * | 2006-11-13 | 2011-06-22 | 思姆菲舍尔科技公司 | Density measurement with gamma backscattering |
| CN101382503B (en) * | 2007-09-06 | 2013-05-08 | 清华大学 | Adjusting device for installing ray generator |
| CN102549413A (en) * | 2009-07-20 | 2012-07-04 | 原子能与替代能源委员会 | Method and device for identifying a material of an object |
| CN101718564B (en) * | 2009-11-17 | 2011-04-27 | 丹东奥龙射线仪器有限公司 | Main stand of multifunctional large-scale X-ray instrument |
| CN101887036A (en) * | 2010-04-27 | 2010-11-17 | 丹东奥龙射线仪器有限公司 | X-ray high-pressure tube fitting detecting platform |
| CN101852746A (en) * | 2010-06-29 | 2010-10-06 | 北京中油联自动化技术开发有限公司 | X-ray measuring device and measuring method of water content and gas content in multiphase flow |
| CN104161538A (en) * | 2014-08-27 | 2014-11-26 | 丁厚本 | Medical CT machine based on Compton backscatter scanning technology |
| CN106901771A (en) * | 2017-03-14 | 2017-06-30 | 丁厚本 | A kind of ray compton backscattering CT scan head and CT Scanner |
| CN107782752A (en) * | 2017-08-31 | 2018-03-09 | 中国核电工程有限公司 | A kind of welding line ray detector and its detection method |
| CN107782752B (en) * | 2017-08-31 | 2022-03-04 | 中国核电工程有限公司 | Welding seam ray detection equipment and detection method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |