CN103760180B - Real-time online industry CT detecting system based on x-ray source array - Google Patents
Real-time online industry CT detecting system based on x-ray source array Download PDFInfo
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- CN103760180B CN103760180B CN201410038927.4A CN201410038927A CN103760180B CN 103760180 B CN103760180 B CN 103760180B CN 201410038927 A CN201410038927 A CN 201410038927A CN 103760180 B CN103760180 B CN 103760180B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
- A61B6/4007—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis characterised by using a plurality of source units
Abstract
The invention discloses a kind of real-time online industry CT detecting system based on x-ray source array, including the conveyer belt for transmitting examined object, the x-ray source array of carbon nanotube cathod is set outside described conveyer belt and coordinates the detector array of the CT detection carrying out examined object with the x-ray source array of carbon nanotube cathod, described system also includes the control device being switched fast reading Tong Bu with detector for carrying out x-ray source, for obtaining the CT image of detector array detection and carrying out the storage of CT image and process the image processing apparatus of operation.This system can be greatly improved sweep speed, is rapidly completed Product checking, improves the production efficiency of factory, saves financial expenditure.
Description
Technical field
The invention belongs to industry CT scanning technique field, be specifically related to a kind of system design belonging to industry CT, relate to especially
And the real-time online industry CT detecting system based on x-ray source array of a kind of novel multi-source CT.
Background technology
Industry CT is the abbreviation of industrial computer tomography technology, it can to detection object not damaged under the conditions of,
With two-dimensional ct image or the form of three-dimensional image, show clearly, accurately, intuitively the structure within object to be detected,
Composition, material and defective eigenpairs, be described as current optimal Non-Destructive Testing and nondestructive evaluation technology.
As it is shown in figure 1, at present, the design of major part industry CT is similar with Medical CT, and conventional CT scan pattern has
II generation scanning, III generation scanning.Both modes are all to be fixed on objective table 3 by fixing examined object 1(), use rotation
Turn and the mode of mobile x-ray source 2 and detector 4 completes full angle sampling (direction of arrow is x-ray source 2 and detector 4
Movement locus, 5 is X-ray wire harness).Such sample mode has many shortcomings, and first, the design of rotation brings system complex
Property, cost uprises, and needs high mechanical movement precision to ensure the sampling degree of accuracy, also improves power consumption and the body of equipment accordingly
Long-pending, secondly, the design of rotation has considerable restraint to the transmission of data, and owing to data transmission can only use brush mostly, data are led to
Road Bandwidth-Constrained, limits picking rate accordingly, it addition, sample mode time consumption is relatively big, large batch of detection will expend
A lot of times and resource.Double source industry CT occurs in recent years, can improve image resolution ratio to a certain extent, but still without
Method shortens sweep time.For for real time on-line monitoring industry CT, the use of traditional rotary scanning is extremely to be stranded
Difficult.
In addition, although have researcher to propose multiple radiogenic thinking, but due to traditional radiographic volume source relatively
Greatly, weight is higher, and X-ray is relatively slow for time response, and this thinking is difficult to carry out.X-ray source based on carbon nanotube cathod is
There is the features such as volume is little, high time resolution, operating temperature are low, power consumption is little, stable and able to programme, this radiogenic appearance
Possibility is provided for significantly shortening the detection time.The present invention is therefore.
Summary of the invention
It is an object of the invention to provide a kind of real-time online industry CT detecting system based on x-ray source array, solve
Machine mechanical movement bulky, a large amount of and the defect such as sweep time is slow present in prior art.
In order to solve these problems of the prior art, present invention provide the technical scheme that
A kind of real-time online industry CT detecting system based on x-ray source array, including obtaining, storing and process CT image
Image processing apparatus, shielding case and the object under test apparatus for placing being arranged in this shielding case, combine detection module, use
The control device of reading Tong Bu with detector it is switched fast, it is characterised in that described object under test apparatus for placing in x-ray source
For conveyer belt, described combine detection module include the support being positioned at outside conveyer belt and be arranged on support based on CNT
The detector array that the x-ray source array of negative electrode coordinates with this x-ray source array, the x-ray source of described x-ray source array is
Several, the incident angle of each x-ray source is circumferentially disposed along examined object.
Described system also includes the conveyer carrying out examined object transmission operation for controlling conveyer belt, described control
Device controls conveyer by instruction and transmits.
Often arrange the x-ray source array of carbon nanotube cathod and often arrange detector array formation combine detection module, described group
Close the quantity of detection module no less than 2.
Described detector is distributed in the side, opposite of x-ray source, and each x-ray source and detector are respectively provided with position and adjust
Regulating device.
When the quantity of described combine detection module is 2, two groups of modules are mutually perpendicular to fix, and x-ray source is visited with corresponding
Survey device and cover the sample range of 180 degree.
Preferably, several combine detection modules are in same plane, and x-ray source covers 180 with corresponding detector
The sample range of degree；Or several combine detection modules are in Different Plane, and x-ray source covers with corresponding detector
The sample range of 180 degree.
Preferably, described control device Synchronization Control x-ray source array and detector array, use through warbled
Control signal, carries out rapid X-ray exposure, reads image, be demodulated in corresponding time interval from detector array
Obtain the imaging of each x-ray source, be sent to image processing apparatus.
Preferably, described image processing apparatus is provided with the CT image for pick-up probe array detection, and schemes CT
The image weight that picture carries out the CT image storage module stored, CT image is rebuild by iterative reconstruction algorithm based on compressed sensing
Model block, be analyzed image processing, and carry out the image processing module of visualization output to user.
Preferably, the x-ray source array of described carbon nanotube cathod and detector array are arranged in shielding case, described
Also set up the object marker device for carrying out examined object mark in shielding case, described examined object by conveyer belt from
After incoming shielding case detects outside shielding case, it is marked, then spreads out of outside shielding case.
Technical solution of the present invention x-ray source based on carbon nanotube cathod.X-ray source based on carbon nanotube cathod has
The advantages such as volume is little, high time resolution, operating temperature are low, power consumption is little, stable and able to programme.The present invention uses this x-ray source
But it is not limited to this x-ray source.Multiple x-ray sources based on carbon nanotube cathod are lined up array, when can effectively utilize it high
Between the feature of resolution ratio, it is achieved expose the most one by one, be equivalent to carry out from different perspectives X-ray sampling, it is achieved
The sampling request that CT rebuilds.The x-ray source based on carbon nanotube cathod used in the present invention can use such as Application No.
201120253622.7 Chinese patent application: array X radiographic source based on field emission cold-cathode.
The Chinese patent application of Application No. 201120253622.7 discloses a kind of array X based on field emission cold-cathode
Radiographic source, including cathode base, cathode electrode, for launching the field emitter of electron beam, reflective plate target；Wherein, exist
Cathode base is provided with cathode electrode, is provided with field emitter on the cathode electrode, and reflective plate target is positioned on cathode base
Just and being oppositely arranged with cathode base, reflective plate target is parallel with cathode base；The electron beam that field emitter is launched bangs
Hitting on reflective plate target, the X-ray of generation passes cathode base outgoing.
Preferably, two or more sets radiographic source arrays of described use and detector array composite module carry out imaging.With one
Row's detector array is connected one composite module of fixing formation respectively with row's x-ray source based on carbon nanotube cathod.Each
Module can stagger according to different angles in isoplanar, forms the sample range covering full angle.Also can be in Different Plane
Utilizing the characteristic of at the uniform velocity belt, different angles place composite module at equal intervals, reach that certain tangent plane is formed covering full angle and adopt
The purpose of sample scope.As a example by using two groups of modules, two groups of modules are mutually perpendicular to fix, and form the sample range covering 180 degree.
If organizing module, the most mutually stagger certain angle more, forms the sample range covering full angle.
Preferably, described control device controls x-ray source array and detector array carries out synchronization process, uses through overfrequency
The control signal of rate modulation, carries out rapid X-ray exposure, reads image in corresponding time interval from detector array,
Being demodulated obtaining the imaging of each x-ray source, whole process time is extremely short, in whole process, and device and the fortune of conveyer belt
Move and be negligible.
Preferably, use control chip to control conveyer belt and transmit examined object, make examined object the most at the uniform velocity wear
Cross two or more sets x-ray source arrays and corresponding detector array.
Preferably, described image reconstruction module uses iterative reconstruction algorithm based on compressed sensing.Due to iterative approximation pair
Irregular sample track possesses good adaptability, but requires higher to number of samples, uses generation based on compressed sensing
Number iteration CT algorithm for reconstructing, it is possible to go out reliable image with less sampling reconstruction.
Preferably, described image processing module uses based on visualization processing, device cross-section image reconstruction obtained
Carry out three-dimensional visualization, it is achieved arbitrary section is observed.Described image processing module uses intelligent analysis system, uses algorithm counterweight
Build visualization result to automatically analyze, according to user's requirement to examined object, automatically check, automatically process mark
Defective device or artificially process.
In technical solution of the present invention, the inspection of product will be carried out by following flow process: first, product to be detected is according to factory
Streamline enter conveyer belt at the uniform velocity advance；When product runs to certain position, trigger photoelectricity gate controlled switch, at this moment, X-ray
Source control circuit triggers primary X-ray imaging, and in primary X-ray imaging, control circuit will produce a series of control signal, control
X-ray source processed frequency dividing is launched, and the detector control circuit of synchronization carries out instantaneous exposure and preserves result, and above procedure is when extremely short
In complete, the product displacement in period is negligible, afterwards, first by demodulation process by the imaging of each x-ray source
Demodulating out from the result obtained, then carried out a cross sectional reconstruction by reconstruction module, conveyer belt moves on simultaneously, with same
The circulation of sample completes the scanning of each tomography；Object leaves X-ray detection region, and now, computer will rebuild the tomography of gained
File；Finally, computer carries out three-dimensional visualization to the volume data that layer data sequence is formed, and shows what user set
Cross section interested, the flaw of product and defect analysis, the index set according to user are made an announcement by intellectual analysis.
Relative to scheme of the prior art, the invention have the advantage that
1, the application present invention can be greatly improved sweep speed, is rapidly completed Product checking, improves the production efficiency of factory,
Save financial expenditure.
2, device uses the pipeline design thinking of conveyor type, can embed in the streamline of factory, for enterprise's letter
Change flow process, convenient introduction.
3, the error using fixing x-ray source and detector that mechanical movement is brought in device significantly reduces, it addition,
The power consumption of device is substantially reduced, and eliminates loss and the noise of mechanical movement, reduces the maintenance cost of equipment, and i.e. environmental protection is again
Improve the life-span of equipment.
4, using x-ray source based on carbon nanotube cathod in device, compared to traditional radiographic source, power consumption declines to a great extent,
And need not hot operation, decrease the problem in terms of heat radiation.
5, device uses the array of x-ray source so that the X-ray emission work originally completed by a radiographic source, point
Stand is carried out to multiple x-ray sources, substantially prolongs the service life of x-ray source.
6, device uses x-ray source and the frequency dividing multiplex technique of detector, be effectively shortened the time needed for sampling.
7, the CT algorithm for reconstructing based on compressed sensing used in the present invention, has few to sampling angle requirement and efficiency is high
Feature, it is possible to achieve the effect of real-time reconstruction.In conjunction with above 1,2,6 advantages, improve speed at links, especially
It is suitable for the quick mass detection of product, is particularly suitable for the mass detection for chip package, electronic product and device.
In sum, the invention provides a kind of real-time online industry CT detecting system based on x-ray source array, including
X-ray source array based on carbon nanotube cathod and detector array set, be switched fast read Tong Bu with detector for radiographic source
The control device taken, the conveyer belt of examined object and motion control device, image is stored in filing system, based on compressed sensing
Iterative reconstruction algorithm rebuild module and visual software and intelligent analysis system, belong to the systems design area of industry CT,
In real time object can be carried out CT fault imaging, and greatly reduce system energy consumption.
Accompanying drawing explanation
Fig. 1 is the scan mode of traditional industry CT, and direction shown in arrow is the movement locus of x-ray source and detector；
Fig. 2 is the knot of the real-time online industry CT detecting system based on carbon nanotube cathod x-ray source array of the present invention
Composition；
Fig. 3 is to use the two sample mode schematic diagrames to x-ray source array and detector array module；
Fig. 4 is to use the three sample mode schematic diagrames to x-ray source array and detector array module；
Fig. 5 is to use the four sample mode schematic diagrames to x-ray source array and detector array module；
Fig. 6 is to use the three spatial arrangement schematic diagrames to x-ray source array and detector array module；
Fig. 7 is to use the four spatial arrangement schematic diagrames to x-ray source array and detector array module；
Fig. 8 is the frequency dividing multiplexed imaging schematic diagram of multi x-ray source array；
Fig. 9 is the control schematic diagram of multi x-ray source array；
Figure 10 is CT algorithm for reconstructing schematic diagram based on compressed sensing；
Figure 11 is system flow block diagram；
Wherein have: examined object 1, x-ray source 2, objective table 3, detector 4, X-ray wire harness 5, shielding case 6, object
Labelling apparatus 7, combine detection module and be switched fast at the control device 8 of reading Tong Bu with detector, image for x-ray source
Reason device 9, conveyer belt 30, x-ray source array 20 and the detector array 40 coordinated with this x-ray source array, x-ray source array
In certain radiographic source produce there is the x-ray signal 21 of certain frequency, indicator lamp 81, emergency stop switch 82, main frame 80.
Detailed description of the invention
Below in conjunction with specific embodiment, such scheme is described further.Should be understood that these embodiments are for illustrating
The present invention and be not limited to limit the scope of the present invention.The implementation condition used in embodiment can be done according to the condition of concrete producer
Adjusting further, not marked implementation condition is usually the condition in normal experiment.
Such as Fig. 2, should real-time online industry CT detecting system based on carbon nanotube cathod x-ray source array, including for
The conveyer belt of transmission examined object 1, arranges the x-ray source array 20 of carbon nanotube cathod and receives with carbon outside described conveyer belt
The x-ray source array of mitron negative electrode coordinates the detector array 40 of the CT detection carrying out examined object 1, and described system also includes
The control device 8 of reading Tong Bu with detector it is switched fast, for obtaining detector array detection for carrying out x-ray source 20
CT image, the storage carrying out CT image and the image processing apparatus 9 of process operation.Control device 8 and be provided with main frame 80, for tightly
The emergency switch 82 of anxious process, the status indicator lamp 81 of display detection state.Control to pass through between device 8 and image processing apparatus 9
Cable connects.
Wherein core component is x-ray source array 20 based on carbon nanotube cathod and corresponding detector array (detection
Device group) 40.This assembly is by row's x-ray source based on carbon nanotube cathod, row's detector and is configured to.Support is U
Type design, x-ray source based on carbon nanotube cathod is arranged in the hole of support side, focus towards the center of support, its base
This circuit links outside by circuit, and detector 40 is distributed in the side, opposite of x-ray source 20, each x-ray source and each spy
Survey device and have apparatus for adjusting position respectively.In the ideal case, the focus of all x-ray sources is positioned on straight line, and with spy
Survey device center line parallel.In actual conditions, due to inevitable error, before using image to rebuild, need to carry out school
Accurate.The x-ray source array of described carbon nanotube cathod and detector array are arranged in shielding case 6, in described shielding case 6
Also set up the object marker device 7 for carrying out examined object mark, described examined object by conveyer belt 30 from shield machine
After incoming shielding case detects outside case, it is marked, then spreads out of outside shielding case.
In this real-time online industry CT detecting system based on carbon nanotube cathod x-ray source array, based on carbon nanometer
The x-ray source array of tube cathode is a row or multi-row with the use of corresponding detector set.Each group module is in x-ray source array side
Being staggered the most mutually, module uses rotating shaft to be connected in frame, in order to carry out angle adjustment according to different demands.Adjusting
In, modules is linkage and keeps parallel to each other.In the present invention, although Fig. 2 is to carry out imaging with two pairs of modules, but
This is only an example, and the present invention comprises use many groups x-ray source array and the situation of detector array module imaging, Qi Zhongtu
3 include using three groups or the situation of four groups, if using more, then can obtain more dense adopting in the range of cost allows
Sample effect, preferably rebuilds effect to obtain.
The sample effect of block combiner, as shown in Fig. 3 ~ 5, can be two groups, three groups of even four groups x-ray source arrays and spy
Survey device array module.In Fig. 3 ~ 5, these x-ray source arrays and detector array module are all in approximately the same plane, and it practice, each
The sampling of module is to carry out in different planes, as shown in Figure 6,7 at synchronization.In Fig. 3 ~ 5 relative to x-ray source
Array and detector array module are in a plane, and module then can be positioned over parallel with it by according to actual needs
Another plane, every pair of module is the most staggered, and wherein Fig. 2 is shown in by the space layout schematic diagram of two groups of modules, three groups and four groups
Situation is as shown in Figure 6,7.When object is in transmission, what each module was adopted is the data of article different cross section and stores, by
In the speed moved by program setting, so the data acquisition fragment of a plane is knowable.Carrying out certain plane
Reconstruction before, image reconstruction module first positions the data storage location of this plane, then takes out layer data from corresponding position and enter
Row is rebuild.
As shown in Fig. 8 ~ 9, the present invention also uses a kind of imaging technique dividing multiplexing, use different radiographic source respectively
Irradiate object (21 for x-ray source tranmitting frequency waveform) with different frequency of exposure simultaneously, can obtain the whole time for exposure is visited
Survey intensity curves, and the radiographic source light intensity curve that this curve is different frequency of exposure is linearly folded with certain weight
The result added, just can be obtained the weight of each radiographic source change curve, i.e. achieve this radiographic source in this pixel by demodulation
Data for projection obtain.Traditional CT imaging mode is that radiographic source is exposed respectively at diverse location.Due to based on carbon nanometer
The x-ray source of tube cathode has low cost, volume is little, high time resolution, operating temperature are low, power consumption is little and able to programme etc. excellent
Point, uses this x-ray source to carry out high-frequency emission in this invention.Assume to expose compared to each radiographic source pointwise, divide multiplexing
Method complete the same light exposure, the required time is shorter, thus improves scan efficiency.
Figure 10 is CT algorithm for reconstructing based on compressed sensing.This algorithm for reconstructing is conventional prior, repeats no more.This is
The inspection of system product as shown in figure 11, will be carried out by following flow process: first, and product to be detected enters according to the streamline of factory
Conveyer belt at the uniform velocity advances；When product runs to certain position, triggering photoelectricity gate controlled switch, at this moment, x-ray source control circuit is touched
Sending out primary X-ray imaging, in primary X-ray imaging, control circuit will produce a series of control signal, control x-ray source and divide
Taking place frequently and penetrate, the detector control circuit of synchronization carries out instantaneous exposure and preserves result, and above procedure completes in very short time, produces
The product displacement in period is negligible, afterwards, first by demodulation process by the imaging of each x-ray source from the result obtained
Middle demodulation out, is then carried out a cross sectional reconstruction by reconstruction module, and conveyer belt moves on simultaneously, completes with same circulation
The scanning of each tomography；Object leaves X-ray detection region, and now, the tomography rebuilding gained is filed by computer；?
After, computer carries out three-dimensional visualization to the volume data that layer data sequence is formed, and shows the cross section interested that user sets,
The flaw of product and defect analysis, the index set according to user are made an announcement by intellectual analysis.
Examples detailed above, only for technology design and the feature of the explanation present invention, its object is to allow person skilled in the art's energy
Solution present disclosure much of that is also implemented according to this, can not limit the scope of the invention with this.All according to present invention spirit
Equivalent transformation that essence is done or modification, all should contain within protection scope of the present invention.
Claims (7)
1. a real-time online industry CT detecting system based on x-ray source array, including obtaining, storing and process CT image
Image processing apparatus, shielding case (6) and the object under test apparatus for placing being arranged in this shielding case, combine detection module and
The control device (8) of reading Tong Bu with detector it is switched fast, it is characterised in that described object under test is put for x-ray source
Putting device is conveyer belt (1), described combine detection module by the support being positioned at outside conveyer belt, and be arranged on support based on
X-ray source array (20) and the detector array (40) coordinated with this x-ray source array of carbon nanotube cathod form, described
The x-ray source of x-ray source array is multiple, and the incident angle of each x-ray source is circumferentially disposed along examined object；Several institute
State combine detection module to be in Different Plane, and x-ray source covers the sample range of 180 degree with corresponding detector.
Real-time online industry CT detecting system based on x-ray source array the most according to claim 1, it is characterised in that
The quantity of described combine detection module is no less than 2.
Real-time online industry CT detecting system based on x-ray source array the most according to claim 1, it is characterised in that
Described system also includes the conveyer carrying out examined object transmission operation for controlling conveyer belt.
Real-time online industry CT detecting system based on x-ray source array the most according to claim 1 and 2, its feature exists
In, when the quantity of described combine detection module is 2, two groups of modules are mutually perpendicular to fix, and x-ray source covers with corresponding detector
Cover the sample range of 180 degree.
Real-time online industry CT detecting system based on x-ray source array the most according to claim 1, it is characterised in that
Described x-ray source and detector are provided with apparatus for adjusting position.
Real-time online industry CT detecting system based on x-ray source array the most according to claim 1, it is characterised in that
Described image processing apparatus be provided with to detector array detection CT image be received and store CT image storage module,
The image reconstruction module that CT image is rebuild, the image that image is analyzed processing and carrying out to user visualization output
Processing module.
Real-time online industry CT detecting system based on x-ray source array the most according to claim 1, it is characterised in that
The object marker device for carrying out examined object mark it is additionally provided with in described shielding case.
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| CN104165895B (en) * | 2014-08-04 | 2016-05-25 | 于双悦 | The formation method of the 3D imaging system of industry CT |
| CN105372269B (en) | 2014-09-02 | 2019-01-15 | 同方威视技术股份有限公司 | X-ray product quality automatic detection device |
| CN106651982B (en) * | 2016-12-16 | 2018-04-17 | 西安交通大学 | A kind of CT image rebuilding methods based on array X radiographic source and detector |
| CN109216137B (en) * | 2017-06-30 | 2024-04-05 | 同方威视技术股份有限公司 | Distributed X-ray source and control method thereof |
| WO2021046883A1 (en) * | 2019-09-19 | 2021-03-18 | 方正 | Transmission imaging detection apparatus and computed tomography system applying same |
| CN111638232A (en) * | 2020-07-13 | 2020-09-08 | 永康市质量技术监测研究院 | Composite material detection device based on CT function |
| CN112903729B (en) * | 2021-01-26 | 2023-03-28 | 西安增材制造国家研究院有限公司 | Industrial online CT for additive manufacturing |
| CN112964738B (en) | 2021-01-29 | 2022-11-22 | 山东大学 | Industrial CT rapid scanning system and method |
| CN114636715B (en) * | 2022-03-09 | 2023-06-16 | 河南省科学院同位素研究所有限责任公司 | High-altitude steel structure corrosion positioning evaluation method based on synchronous positioning of upper shed and lower shed |
| CN116124806B (en) * | 2023-04-20 | 2023-06-20 | 常州市柯盛包装有限公司 | Honeycomb paperboard core hole quality detection device and working method thereof |
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