CN102175699A - Examining system, examining method, CT (computed tomography) device and detecting device - Google Patents
Examining system, examining method, CT (computed tomography) device and detecting device Download PDFInfo
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Abstract
The invention provides an examining system, wherein the system comprises a CT (computed tomography) device which comprises a slip ring, a ray source connected to the slip ring, a detecting device opposite to the ray source and connected to the slip ring, and a transmitting device for transmitting examined objects; when the examined objects are progressed and approached to the plane at which the slip ring is positioned, the examined objects are slowed down for progressing at a low speed, and are accelerated for progressing at a high speed after the ray sources stops emitting rays, wherein the detecting device comprises N lines of detectors; a predetermined interval is reserved between two adjacent lines of detectors; N is an integer greater than one. By utilizing the examining system provided by the invention, the high-speed scan imaging of the CT device is realized, and the CT device and a scan imaging device for obtaining two-dimensional images are possibly used synchronously, so that the defects between the CT device and the scan imaging device are overcome.
Description
The application is dividing an application of application number is 200710176528.4, denomination of invention is on October 30th, 2007 patented claim for " check system, inspection method, CT device and sniffer ", the applying date.
Technical field
The present invention relates to check system, inspection method, CT device and sniffer.
Background technology
In order to solve CT device sweep velocity problem, conventional method just is to use multi-detector, thereby can gather many row data, for example patented claim WO2005/119297 simultaneously at every turn.But, significantly increase row's digital display and get not reality so because the detector cost is higher.
Summary of the invention
Propose check system, inspection method, CT device and sniffer among the present invention, wherein sniffer can effectively reduce the detector row number, thereby reduce the cost of sniffer under the situation that increases the sniffer useful detection area.
According to an aspect of the present invention, the present invention proposes a kind of check system, this system comprises: the CT device, and this CT device comprises: slip ring, the radiographic source that connects with slip ring, relative with radiographic source and be connected sniffer on the slip ring; And the conveyer that transmits inspected object, wherein said sniffer comprises N row detector, and has predetermined interval between the described detecting device of adjacent two rows, wherein N is the integer greater than 1.
Described preset space length can be 5 to 80mm or 30 to 50mm.
According to a further aspect in the invention, whenever revolve in the inspection area of three-sixth turn at slip ring, every row's detector is checked the fan-shaped part of the 360 degree/N in this zone, slip ring whenever revolves three-sixth turn/N simultaneously, conveyer is the centre distance of adjacent two row's detectors with the distance of movement of objects, and first row's detector of the upstream side of the conveyer moving direction from described N row detector begins to detect 360 corresponding degree/N respectively to last row's detector successively thus.
According to an aspect of the present invention, described check system: also comprise the scanned imagery device that is used to obtain two dimensional image, described CT device and the described scanned imagery device that is used to obtain two dimensional image can move simultaneously, to obtain to be examined the 3-D view of article and to obtain two dimensional image by the described scanned imagery device that is used to obtain two dimensional image by the CT device simultaneously.
Optimal way is, the speed that described CT device and the described scanned imagery device that is used to obtain two dimensional image move simultaneously is 0.18-0.25m/s.
According to the one side of this religious name, the present invention proposes a kind of inspection method, this method comprises: transmit inspected object; And utilize the CT device to check this object, wherein this CT device comprises: slip ring, the radiographic source that connects with slip ring, relative with radiographic source and be connected sniffer on the slip ring, wherein said sniffer comprises N row detector, and has predetermined interval between the described detecting device of adjacent two rows, wherein N is the integer greater than 1
Optimal way is, slip ring whenever revolves three-sixth turn/N, conveyer is the centre distance of adjacent two row's detectors with the distance of movement of objects, and first row's detector of the upstream side of the conveyer moving direction from described N row detector begins to detect 360 corresponding degree/N respectively to last row's detector successively thus.
According to an aspect of the present invention, described inspection method comprises that also the scanned imagery device that is used to obtain two dimensional image checks described object, described CT device and the described scanned imagery device that is used to obtain two dimensional image move simultaneously, to obtain to be examined the 3-D view of article and to obtain two dimensional image by the described scanned imagery device that is used to obtain two dimensional image by the CT device simultaneously.
Optimal way is, the speed that described CT device and the described scanned imagery device that is used to obtain two dimensional image move simultaneously is 0.18-0.25m/s.
According to an aspect of the present invention, the present invention proposes a kind of CT device, this CT device comprises: slip ring, the radiographic source that connects with slip ring, relative with radiographic source and be connected sniffer on the slip ring, wherein said sniffer comprises N row detector, and have predetermined interval between the described detecting device of adjacent two rows, wherein N is the integer greater than 1.
In accordance with a further aspect of the present invention, the present invention proposes a kind of sniffer of the CT of being used for device, described sniffer comprises N row detector, and has predetermined interval between the described detecting device of adjacent two rows, and wherein N is the integer greater than 1.
Optimal way is, described preset space length is 5 to 80mm.Preferred mode is that described preset space length is 30 to 50mm.
Description of drawings
These and/or other aspect of the present invention and advantage are from obviously and easily understanding below in conjunction with becoming the accompanying drawing description of preferred embodiments, wherein:
Fig. 1 is the synoptic diagram according to the check system of the embodiment of the invention.
Fig. 2 is the CT schematic representation of apparatus according to the embodiment of the invention.
Fig. 3 is the synoptic diagram according to the sniffer of the embodiment of the invention.
Fig. 4 is for describing the diagrammatic top view according to the arrangement of the detector on the sniffer of the embodiment of the invention.
Fig. 5 is the structural representation of scintillator detector.
Fig. 6 is the vertical view of scintillator detector.
Fig. 7 is the 3 d effect graph of scintillator detector.
Fig. 8 is the vertical view of the single row detector that is combined into by a plurality of detector modules.
Fig. 9 is the synoptic diagram of the wide detecting for spaces device of many rows.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein identical from start to finish label is represented components identical.Below by embodiment is described with reference to the drawings so that explain the present invention.
As shown in figs. 1 and 2, check system according to the present invention comprises: the CT device, and this CT device comprises: slip ring, the radiographic source that connects with slip ring, relative with radiographic source and be connected sniffer on the slip ring; And the conveyer that transmits inspected object, wherein said sniffer comprises N row detector, and has predetermined interval between the described detecting device of adjacent two rows, wherein N is the integer greater than 1.
In one embodiment of the invention, check system can also comprise the scanned imagery device that is used to obtain two dimensional image, described CT device and the described scanned imagery device that is used to obtain two dimensional image can move simultaneously, to obtain to be examined the 3-D view of article and to obtain two dimensional image by the described scanned imagery device that is used to obtain two dimensional image by the CT device simultaneously.
In the embodiment shown in Fig. 1, check system according to the present invention comprises scanned imagery device and the CT device that is used to obtain be examined the two-dimensional transmission image of article.The scanned imagery device that acquisition is examined the two dimensional image of article can be existing any type of scanned imagery device, comprises the scanned imagery device of monoenergetic and dual intensity DR.Check system can be checked explosive and drugs etc.The CT imaging device can accurately obtain the information of 3D shape, size, equivalent atom ordinal number Z value and the density D value of object to be detected, the distribution in Z-D figure according to explosive and drugs, can accurately judge above-mentioned prohibited items, it adopts the multi-detector structure simultaneously, can add fast scan speed to a great extent, improve the currency rate.
Check system according to the present invention also comprises: the belt conveyor that is made of support 1, travelling belt 6, belt position scrambler 5.
The radiographic source 7 that the scanned imagery device that is used to obtain two dimensional image comprises support 2, connect with support 2, relative with radiographic source 7 and be connected detector and data acquisition unit 8 on the support 2.
The CT device comprises: support 3, be arranged on slip ring 11 on the support 3, the radiographic source 9 that connects with slip ring 11, relative with radiographic source 9 and be connected detector and data acquisition unit or sniffer 10 on the slip ring 11 rotationally.
In addition, check system according to the present invention also comprises: be used for determining the luggage case position luggage case locating device 4, be used to control the control module 12 of check system, the computer data processor 14 that is used for the computer data processor 13 that data that the scanned imagery device to two dimensional image obtains handle and is used for the data that the CT device obtains are handled.
Described luggage case locating device 4 can adopt light barrier or other equipment to realize, is used to judge the starting point and the terminal point of luggage case, cooperates belt position scrambler 5, can determine the position of luggage case in the luggage passage.
Described detector and data acquisition unit are the integral module structure, comprise signal amplification, A/D conversion and data transfer circuit in the data acquisition unit.
Described radiographic source 7 places luggage passage one side, the ray beam that described detector and data acquisition unit 8 place luggage passage opposite side and penetrate over against radiographic source 7; Radiographic source 9 and detector and data acquisition unit 10 all are fixed on the slip ring 11, the ray beam that detector and data acquisition unit 10 penetrate over against radiographic source 9.
Control module 12 and luggage case locating device 4, belt position scrambler 5, belt conveyer 6, radiographic source 7, detector and data acquisition unit 8, radiographic source 9, detector and data acquisition unit 10, slip ring 11, computer data processor 13, computer data processor 14 all link to each other and the duty of synchro control each several part.
The data output cable of detector and data acquisition unit 8 links to each other with computer data processor 13, and the data output cable of detector and data acquisition unit 10 links to each other with computer data processor 14.
As shown in Figure 2, also can only comprise the CT device according to check system of the present invention.
As shown in Figure 3-4, the sniffer 10 that is used for the CT device comprises: multi-detector has predetermined interval between the described detecting device of wherein adjacent two rows.Described multi-detector can be arranged in has the surface of cylindrical so substantially.Multi-detector can adopt any suitable arrangement structure well known in the art, as long as have predetermined interval between the described detecting device of adjacent two rows.
T among Fig. 4 represents adjacent two row's detectors along the centre distance on the direction of transfer of the travelling belt among Fig. 16, and d represents that detector is along the width on the direction of transfer of the travelling belt among Fig. 16.Described spacing is the difference of t and d.
The centre distance t of adjacent two row's detectors in the detector according to sniffer 10 of the present invention＞＞d, thus effectively reduce crystalline areas, reduced cost.In contrast to single detector, can increase exponentially detection speed.Obviously, do like this and reduced spatial resolution, but consider for different needs, explosive detection for example, spatial resolution requires lower, because generally do not constitute a threat to less than the explosive of a dimensioning, also is that law allows.
According to an example of the present invention, described preset space length can be 5 to 80mm.
According to another example of the present invention, described preset space length can be 10 to 70mm.
According to another example of the present invention, described preset space length can be 20 to 60mm.
According to another example of the present invention, described preset space length is 30 to 50mm.
According to a further example of the present invention, described preset space length can be 35 to 45mm.
According to another example of the present invention, described preset space length can be 36 to 40mm, perhaps 38mm.
Described preset space length can adopt different spacings as required, and for example for explosive, when the width d of detector was 2mm, if spacing is 38mm, explosive did not generally constitute a threat to, and was that law allows yet.Also can correspondingly determine the spacing of detector in addition according to actual conditions and legal requiremnt for cutter, rifle etc.
The width d of The common detector is 1-10mm.The present invention also can adopt centre distance to limit the arrangement of multi-detector, and for example, according to an example of the present invention, described centre distance can be 15 to 65mm.According to another example of the present invention, described preset space length can be 25 to 55mm.
According to another example of the present invention, described preset space length can be 35 to 45mm.According to another example of the present invention, described preset space length can be 40mm.
Can be applied to range detector according to detector arrangement of the present invention, for example scintillator detector etc.Be example with the scintillator detector below, the structure of detector of the present invention is described.
Shown in Fig. 5-8, scintillator detector comprises: scintillation crystal; Photodiode; And preamplifier circuit.X-ray bombardment is behind scintillation crystal, and scintillation crystal sends visible light, and this visible light becomes electric signal by photodiode converts.Electric signal is handled through passing to back-end circuit behind the amplifier again.
Usually, consider problems such as technology and cost, the size of crystal is generally all very little, and large-sized detector is general all by realizations that be stitched together of little module, has both reduced cost and also has been convenient to maintenance.
Fig. 5-7 shows a detector module.As shown in Figure 8, a plurality of module spliced are connected together becomes single row detector, and single row detector can be arranged in a straight line or arc.
By increasing the mode of spacing between adjacent two row's detectors, increase the effective width of detector.Consider that dangerous material detect the spatial resolution demand, the spacing between adjacent two row's detectors can be set to 80mm.In addition, under the situation of checking the object that size is bigger, the spacing between adjacent two row's detectors can be set to bigger size, for example greater than 80mm.Spacing between adjacent two row's detectors can be selected according to actual conditions.In addition, to the demand of speed and the control of cost, select to use row's number of detector in using according to reality.
Can carry out various scannings according to detector of the present invention, for example this detector can be used for circular orbit scanning, and this detector can be used for conventional helical orbit scanning, and this detector can be used for satisfying the helical orbit scanning of specified conditions.
As example, a kind of scan mode of the present invention is described below with reference to Fig. 9.
The spacing that designs between adjacent two row's detectors is t, total N row, and the rotating speed of slip ring is r
0, the speed of travelling belt is s, then can design the scan mode that satisfies following relation:
Whenever revolve in the inspection area of three-sixth turn at slip ring, every row's detector is checked the fan-shaped part of the 360 degree/N in this zone, slip ring whenever revolves three-sixth turn/N simultaneously, conveyer is the centre distance of adjacent two row's detectors with the distance of movement of objects, and first row's detector of the upstream side of the conveyer moving direction from described N row detector begins to detect 360 corresponding degree/N respectively to last row's detector successively thus.
If the initial position of the 1st row's detector is T
0, then the 2nd row is T
0-t, the 3rd row is T
0-2t, and the like.
Then be easy to get by the co-relation formula, when slip ring (being detector) rotates the 1/N circle, detector at axial traveling apart from t, so this moment, position of detector became the 1st row T
0+ t, the 2nd row is T
0, the 3rd row is T
0-t, and the like.At this moment, the same axial location of the n row detector before n+1 row detector falls within and rotates, angle differs
Hence one can see that, and after slip ring rotated a whole circle, N row detector was just arranged full T
0To T
02 π angles the in+t scope.
Below concrete scanning step will be described:
1, setting the slip ring rotational speed is r
0(r/s), the speed of setting travelling belt is s (m/s), and makes both satisfy relation
Wherein t (m) is adjacent two row's detectors intervals, and N is the detector row number.
2, the start-up control motor makes slip ring and travelling belt according to above-mentioned setting speed uniform motion.
3, when slip ring turns to a certain angle, we are assumed to be 0 degree, and the control x-ray source sends X ray, and the startup detector carries out data acquisition.Be sake of clarity, our hypothesis is a benchmark with first row's detector, but is not limited to this.This moment first, row's detector was T with respect to belt position
0, corresponding second ranking is in T
0-t, the N ranking is in T
0-(N-1) t.
4, slip ring rotates to from 0 degree
Degree carries out continuous acquisition to this interval censored data.Because rotating speed and line speed satisfy
Relation, this moment, the travelling belt range ability was t.Then the data area of first row's detector collection is the angle direction collection
Degree, conveyer belt direction scope is T
0To T
0The data of+t.At this moment, first row's detector is positioned at T
0+ t position, second row then is positioned at T
0The position, and the like, the N ranking is in T
0-(N-2) t
5, slip ring from
Degree turns to
Degree carries out continuous acquisition to this interval censored data.The scope of easily being known second row's detector collection by step 4 is angle direction collection collection
Degree, conveyer belt direction scope is T
0To T
0The data of+t.At this moment, first row's detector is positioned at T
0+ 2t position, second row then is positioned at T
0+ t position, and the like, the N ranking is in T
0-(N-3) t.
6, similar step 4 and step 5, slip ring rotates continuously, when the collection of N-1 row detector finishes
Degree, T
0To T
0During data, N row detector then is positioned at T in the+t scope
0The position.
7, when arranging the detector collection, finishes N
Degree, T
0To T
0During data, then finish the data acquisition of one-period in the+t scope.
8, as can be known, we use N row detector, have collected T by step 4-7
0To T
0The data (image data scope synoptic diagram when figure below is N=4) of the 0-360 degree the in+t scope.By these group data are carried out cross sectional reconstruction, can obtain T
0To T
0Faultage image in the+t scope.
9, because the continuous running of slip ring and travelling belt, step 4-7 is continuous continuous carrying out as can be known, thereby can access the faultage image of checking matter at each diverse location.
Below with reference to Fig. 9 is example with 4 row's detectors again, and scan mode of the present invention is described.
Every row's detector scans the 360/4=90 degree in 360 scopes respectively, gets detector pitch t=40mm.
The slip ring rotating speed is 1.5r/s, then can calculate sweep velocity to be:
s＝Nr
0t
s＝4×1.5×0.04＝0.24m/s。
These data can be rebuild by the fan-beam reconstruction algorithm of considering cone angle effects.
When the source when detector distance is 1000mm, maximum cone angle:
Limit cone angle 5 degree less than circular orbit cone-beam in the experience is rebuild can not cause the pseudo-shadow of serious reconstruction.According to normal spiral scan reconstruction method, the effective width of detector is 120mm.Equivalence is 60mm (λ=2) to the center.If slip ring is with the speed rotation of 1.5r/s, 2 times of pitch are calculated.2 times of pitch maximum pitch wherein for rebuilding in the at present known helical reconstruction algorithms.
If the detector effective width is q (mm), amplification ratio is λ (λ＞1), and the slip ring rotating speed is r
0(r/s), pitch is p, and then the fast S of travelling belt can be calculated as follows.
In summary, this scan method can effectively improve sweep velocity.
The speed that described CT device and the described scanned imagery device that is used to obtain two dimensional image move simultaneously can be 0.18-0.25m/s.
For the CT device shown in Fig. 1-2, if slip ring speed adopts 1.5r/s, the focus of radiographic source 9 is 500mm to slip ring centre distance, and the focus of radiographic source 9 is 1000mm to detector distance, and then amplification ratio is: λ=1000/500=2.
If adopt four row's detectors, detector crystal size d is 2mm, and adjacent two row's centre distance t are 40mm, and then whole detector width is q=120mm, adopts 2 times of pitch to rebuild, and can obtain the transfer rate of belt:
S＝P*r
0*(q/λ)＝2*1.5*(0.120/2)＝0.18m/s
Wherein: " pitch " is an important parameter of helical orbit, and the definition of pitch has multiplely in the document, and the distance that pitch P is defined as the helical orbit two adjacent rings in this paper and detector zoom to the ratio of the height behind the rotation center.The detector effective width is q (mm), and amplification ratio is λ (λ＞1), and the slip ring rotating speed is r
0
Present most of commercial with in the check systems, CT device and the scanned imagery device that is used to obtain two dimensional image can not use simultaneously because the scanning imagery speed difference is bigger.General flow process is when DR has detected suspicious item, re-uses CT and scans.Increased the rate of failing to report of system so undoubtedly.Adopt CT device of the present invention, realized the high-velocity scanning imaging of CT device, the scanned imagery device that makes CT device and being used to obtain two dimensional image uses simultaneously and becomes possibility, thus the deficiency between having remedied mutually.
At this moment, be 20mm in the resolution of Z direction (horizontal direction), XY direction (perpendicular) resolution is higher than 10mm, considers various possible laying methods, and detectable minimum volume is about 10cm
3Common explosive density is at 1.5-1.9g/cm
3Between, can detect the minimum explosive of 20g.Because it is 50 grams that influences such as system noise, system's actual measurement can detect minimum explosive.
Below with reference to figure Fig. 1,2,4,9, describe according to inspection method of the present invention.
A kind of inspection method according to the present invention comprises: transmit inspected object; And utilize the CT device to check this object, wherein this CT device comprises: slip ring, the radiographic source that connects with slip ring, relative with radiographic source and be connected sniffer on the slip ring, wherein said sniffer comprises N row detector, and have predetermined interval between the described detecting device of adjacent two rows, wherein N is the integer greater than 1.
According to embodiments of the invention, slip ring whenever revolves three-sixth turn/N, conveyer is the centre distance of adjacent two row's detectors with the distance of movement of objects, and first row's detector of the upstream side of the conveyer moving direction from described N row detector begins to detect 360 corresponding degree/N respectively to last row's detector successively thus.
Described inspection method can also comprise that the scanned imagery device that is used to obtain two dimensional image checks described object, described CT device and the described scanned imagery device that is used to obtain two dimensional image move simultaneously, to obtain to be examined the 3-D view of article and to obtain two dimensional image by the described scanned imagery device that is used to obtain two dimensional image by the CT device simultaneously.Optimal way is, the speed that described CT device and the described scanned imagery device that is used to obtain two dimensional image move simultaneously is 0.18-0.25m/s.
Describe the operation of check system of the present invention in detail below with reference to Fig. 1 and 2.
1. connect power supply by luggage case locating device 4, belt position scrambler 5, belt conveyer 6, radiographic source 7, detector and data acquisition unit 8, radiographic source 9, detector and the data acquisition unit (detector) 10 of control module 12 controls, slip ring 11, computer data processor 13, computer data processor 14, under the control of control module 12, the belt high-speed cruising, slip ring 11 beginnings are positioned over luggage case on the belt then with the specific speed rotation.
2. luggage case marches to luggage case locating device 4, and luggage case locating device 4 is determined the starting point of luggage case; Control module 12 is according to the position of the counting real-time follow-up luggage case of this starting point and belt position scrambler 5; When luggage case left luggage case locating device 4, luggage case locating device 4 was determined the terminal point of luggage cases, the length that control module 12 can calculate luggage case according to the starting point and the terminal point of luggage case.
3. when luggage case marches near radiographic source 7 and detector and plane, data acquisition unit 8 place, radiographic source 7 beginning divergent-rays.The ray of radiographic source 7 emissions passes object to be detected and receives and form data for projection by detector and data acquisition unit 8 over against ray beam.Control module 12 control detector and data acquisition unit 8 are according to certain speed sampling, and the data for projection that sampling obtains is sent to computer data processor 13.When the terminal point of luggage case left radiographic source 7 and detector and plane, data acquisition unit 8 place, radiographic source 7 stopped divergent-ray.
4. 13 pairs of data for projection of computer data processor are proofreaied and correct, are rebuild, and obtain the two dimensional image of object to be detected.
5. when luggage case marches near plane, slip ring 11 place, radiographic source 9 beginning divergent-rays.The ray of radiographic source 9 emissions passes object to be detected and receives and form data for projection by detector and data acquisition unit (detector) 10 over against ray beam.Control module 12 control slip rings 11 are with certain speed rotation, simultaneously detector and data acquisition unit 10 also under the control of control module 12 according to certain speed sampling.The data for projection that sampling obtains is sent to computer data processor 14.When the terminal point of luggage case left plane, slip ring 11 place, radiographic source 9 stopped divergent-ray.Optimal way is, when luggage case marches near plane, slip ring 11 place, belt be decelerated to that low speed is advanced and, radiographic source 9 stops after the divergent-ray, belt accelerates to high-speed travel.
6. in the time can not judging by X-Y scheme whether object to be detected comprises explosive or drugs, the equivalent atom ordinal number and the density information that obtain object to be detected can be proofreaied and correct, be rebuild to computer data processor 14 to data for projection, utilize the data of suspicion thing in these information comparison databases, and make final judgement in conjunction with the size and the shape of suspicion thing, and the detection information that intuitively shows inspected object then marks the suspicion thing if any the suspicion thing in two-dimension projection.
Adopt the sniffer of present design, not only can be, and accurate 3 dimension CT reconstructed images can be provided for the security staff provides familiar X-Y scheme, for the security staff to whether keeping explosive in the luggage case and drugs provide basis for estimation comprehensively and accurately.
Claims (12)
1. check system, this system comprises:
The CT device, this CT device comprises: slip ring, the radiographic source that connects with slip ring, relative with radiographic source and be connected sniffer on the slip ring; And
Transmit the conveyer of inspected object, when inspected object marches near plane, slip ring place, be decelerated to that low speed is advanced and, radiographic source stops to accelerate to high-speed travel after the divergent-ray,
Wherein said sniffer comprises N row detector, and has predetermined spacing between the described detecting device of adjacent two rows, and wherein N is the integer greater than 1.
2. check system according to claim 1, wherein
Described preset space length is 5 to 80mm.
3. check system according to claim 1, wherein
Described preset space length is 30 to 50mm.
4. check system according to claim 1, wherein
Whenever revolve in the inspection area of three-sixth turn at slip ring, every row's detector is checked the fan-shaped part of the 360 degree/N in this zone, and slip ring whenever revolves three-sixth turn/N simultaneously, and conveyer is the centre distance of adjacent two row's detectors with the distance of movement of objects.
5. check system according to claim 1: also comprise the scanned imagery device that is used to obtain two dimensional image, described CT device and the described scanned imagery device that is used to obtain two dimensional image can move simultaneously, to obtain to be examined the 3-D view of article and to obtain two dimensional image by the described scanned imagery device that is used to obtain two dimensional image by the CT device simultaneously.
6. check system according to claim 5: the speed that wherein said CT device and the described scanned imagery device that is used to obtain two dimensional image move simultaneously is 0.18-0.25m/s.
7. inspection method comprises:
Transmit inspected object; And
Utilize the CT device to check this object, wherein this CT device comprises: slip ring, the radiographic source that connects with slip ring, relative with radiographic source and be connected sniffer on the slip ring, when inspected object marches near plane, slip ring place, be decelerated to that low speed is advanced and, radiographic source stops after the divergent-ray, inspected object accelerates to high-speed travel
Wherein said sniffer comprises N row detector, and has predetermined interval between the described detecting device of adjacent two rows, and wherein N is the integer greater than 1.
8. inspection method according to claim 7, wherein slip ring whenever revolves three-sixth turn/N, and conveyer is the centre distance of adjacent two row's detectors with the distance of movement of objects.
9. inspection method according to claim 7, wherein
Described preset space length is 5 to 80mm.
10. inspection method according to claim 7, wherein
Described preset space length is 30 to 50mm.
11. inspection method according to claim 7: comprise that also the scanned imagery device that is used to obtain two dimensional image checks described object, described CT device and the described scanned imagery device that is used to obtain two dimensional image move simultaneously, to obtain to be examined the 3-D view of article and to obtain two dimensional image by the described scanned imagery device that is used to obtain two dimensional image by the CT device simultaneously.
12. inspection method according to claim 7: the speed that wherein said CT device and the described scanned imagery device that is used to obtain two dimensional image move simultaneously is 0.18-0.25m/s.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103630563A (en) * | 2013-12-04 | 2014-03-12 | 公安部第一研究所 | X-ray helical scanning and navigating method |
| CN104237961A (en) * | 2014-09-25 | 2014-12-24 | 同方威视技术股份有限公司 | Security check machine item tracking method and device |
| WO2018184580A1 (en) * | 2017-04-07 | 2018-10-11 | 清华大学 | Computed tomography inspection device |
| CN112557425A (en) * | 2020-12-24 | 2021-03-26 | 北京航星机器制造有限公司 | CT detection device and tape stop control method |
| CN115113289A (en) * | 2021-07-07 | 2022-09-27 | 同方威视技术股份有限公司 | Inspection system and method |
| CN115598717A (en) * | 2021-07-07 | 2023-01-13 | 同方威视技术股份有限公司（Cn） | Inspection system and method |
| CN115113289B (en) * | 2021-07-07 | 2024-04-26 | 同方威视技术股份有限公司 | Inspection system and method |
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| CN104237961A (en) * | 2014-09-25 | 2014-12-24 | 同方威视技术股份有限公司 | Security check machine item tracking method and device |
| CN104237961B (en) * | 2014-09-25 | 2018-05-22 | 同方威视技术股份有限公司 | A kind of screening machine item tracing apparatus and method |
| WO2018184580A1 (en) * | 2017-04-07 | 2018-10-11 | 清华大学 | Computed tomography inspection device |
| CN112557425A (en) * | 2020-12-24 | 2021-03-26 | 北京航星机器制造有限公司 | CT detection device and tape stop control method |
| CN112557425B (en) * | 2020-12-24 | 2023-01-10 | 北京航星机器制造有限公司 | CT detection device and tape stop control method |
| CN115113289A (en) * | 2021-07-07 | 2022-09-27 | 同方威视技术股份有限公司 | Inspection system and method |
| CN115598717A (en) * | 2021-07-07 | 2023-01-13 | 同方威视技术股份有限公司（Cn） | Inspection system and method |
| CN115113289B (en) * | 2021-07-07 | 2024-04-26 | 同方威视技术股份有限公司 | Inspection system and method |
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