CN103760180A - X-ray source array based real-time online industrial CT (computed tomography) detecting system - Google Patents
X-ray source array based real-time online industrial CT (computed tomography) detecting system Download PDFInfo
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Abstract
The invention discloses an X-ray source array based real-time online industrial CT (computed tomography)detecting system. The system comprises a conveyor belt for conveying a to-be-detected object, wherein an X-ray source array of a carbon nanotube cathode and a detector array matched with the X-ray source array of the carbon nanotube cathode to conduct CT detection on the to-be-detected object are arranged on the outer side of the conveyor belt, and the system further comprises a control device for rapidly switching an X-ray source and reading a detector synchronously, and an image processing device used for acquiring a CT image detected by the detector array and storing and processing the CT image. The system greatly increases the scanning speed, rapidly finishes product detection, improves the production efficiency of a factory, and reduces economic cost.
Description
Technical field
The invention belongs to industry CT scanning technique field, be specifically related to a kind of system that belongs to industry CT, particularly the real-time online industry CT detection 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 be to detecting under object not damaged condition, with the form of two-dimensional ct image or three-dimensional image, clear, to show accurately, intuitively object to be detected inside structure, composition, material and damaged situation, be described as current best Non-Destructive Testing and nondestructive evaluation technology.
As shown in Figure 1, at present, design proposal and the Medical CT of most of industry CT are similar, conventional CT scan pattern have II for scanning, III is for scanning.These two kinds of modes are to be all fixed on objective table 3 by fixing examined object 1(), complete full angle sampling (direction of arrow is the movement locus of x-ray source 2 and detector 4, and 5 is X ray wire harness) by rotation and the mode of mobile x-ray source 2 and detector 4.Such sample mode has many shortcomings, and first, the design of rotation brings system complexity, cost uprises, and needs high mechanical motion precision to guarantee the accuracy of sampling, corresponding power consumption and the volume that has also improved equipment, secondly, the design of rotation has considerable restraint to the transmission of data, and because data transmission can only be used brush mostly, data channel bandwidth is limited, limited accordingly picking rate, in addition, sample mode time consumption is larger, and large batch of detection will expend a lot of time and resource.There is in recent years double source industry CT, can improve to a certain extent image resolution ratio, but still cannot shorten sweep time.For for real time on-line monitoring industry CT, the use of traditional rotary scanning is extremely difficult.
In addition, although there is researcher to propose multiple radiogenic thinkings, because traditional radiographic source volume is larger, weight is higher, and X ray is slower time response, and this thinking is difficult to carry out.X-ray source based on carbon nanotube cathod be have that volume is little, high time resolution, working temperature is low, power consumption is little, the feature such as stable and able to programme, thisly radiogenicly appears as that significantly shorten detection time and provide may.The present invention therefore.
Summary of the invention
The object of the present invention is to provide a kind of real-time online industry CT detection system based on x-ray source array, solved the defects such as bulky, a large amount of mechanical motion of the machine existing in prior art and sweep time be slow.
In order to solve these problems of the prior art, technical scheme provided by the invention is:
A kind of real-time online industry CT detection system based on x-ray source array, comprise and obtaining, the image processing apparatus of Storage and Processing CT image, shielding case and be arranged on the object under test apparatus for placing in this shielding case, combine detection module, for x-ray source, switch fast and synchronize the control device reading with detector, it is characterized in that, described object under test apparatus for placing is travelling belt, described combine detection module comprises and is positioned at the support in travelling belt outside and is arranged on the x-ray source array based on carbon nanotube cathod on support, the detector array coordinating 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 circumferentially arranges along examined object.
Described system also comprises the conveyer that carries out examined object transmission operation for controlling travelling belt, and described control device transmits by instruction control conveyer.
The x-ray source array of every row's carbon nanotube cathod and every row's detector array form combine detection module, and the quantity of described combine detection module is no less than 2.
Described detector is distributed in opposite one side of x-ray source, and each x-ray source and detector setting position regulating device respectively.
When the quantity of described combine detection module is 2, two pack modules are mutually vertical fixing, and x-ray source and corresponding detector cover the sample range of 180 degree.
Preferably, several combine detection modules are in same plane, and the sample range of x-ray source and corresponding detector covering 180 degree; Or several combine detection modules are in Different Plane, and the sample range of x-ray source and corresponding detector covering 180 degree.
Preferably, described control device synchro control x-ray source array and detector array, adopt through warbled control signal, carry out rapid X-ray exposure, in the corresponding time interval, from detector array, list and read image, carry out the imaging that demodulation obtains each x-ray source, send to image processing apparatus.
Preferably, described image processing apparatus is provided with the CT image for pick-up probe array detection, and the CT image memory module that CT image is stored, image reconstruction module that the iterative reconstruction algorithm based on compressed sensing is rebuild CT image, image is carried out to analyzing and processing, and to user, carry out the image processing module of visual output.
Preferably, x-ray source array and the detector array of described carbon nanotube cathod are arranged in shielding case, in described shielding case, be also provided for carrying out the object marker device of examined object mark, described examined object by travelling belt from shielding case outside is imported shielding case into and is detected, carry out mark, then spread out of outside shielding case.
The x-ray source of technical solution of the present invention based on carbon nanotube cathod.X-ray source based on carbon nanotube cathod has that volume is little, high time resolution, working temperature is low, power consumption is little, the advantage such as stable and able to programme.The present invention uses this x-ray source but is not limited to this x-ray source.Multiple x-ray sources based on carbon nanotube cathod are lined up to array, can effectively utilize the feature of its high time resolution, realize and exposing one by one at short notice, be equivalent to carry out from different perspectives X ray sampling, realize the sampling request that CT rebuilds.The Chinese patent application that it is 201120253622.7 that the x-ray source based on carbon nanotube cathod adopting in the present invention can adopt as application number: based on the array X radiographic source of field emission cold-cathode.
Application number is that 201120253622.7 Chinese patent application discloses a kind of array X radiographic source based on field emission cold-cathode, comprises cathode base, cathode electrode, the field emitter for divergent bundle, reflective plate target; Wherein, be provided with cathode electrode on cathode base, be provided with field emitter on cathode electrode, reflective plate target is positioned at cathode base top and is oppositely arranged with cathode base, and reflective plate target is parallel with cathode base; The beam bombardment that field emitter is launched is to reflective plate target, and the X ray of generation is through cathode base outgoing.
Preferably, two or more sets radiographic source arrays of described use and detector array composite module carry out imaging.With row's detector array, be connected and fixed and form a composite module with the x-ray source of a row based on carbon nanotube cathod respectively.Modules can, in isoplanar, stagger according to different angles, forms the sample range that covers full angle.Also can utilize the at the uniform velocity characteristic of belt in Different Plane, uniformly-spaced different angles are placed composite module, reach certain tangent plane is formed to the object that covers full angle sample range.To use two pack modules as example, two pack modules are mutually vertical fixing, form the sample range that covers 180 degree.If many pack modules, the certain angle that mutually staggers, forms the sample range that covers full angle.
Preferably, described control device control x-ray source array and detector array are synchronously processed, adopt through warbled control signal, carry out rapid X-ray exposure, in the corresponding time interval, from detector array, listing and reading image, carrying out demodulation and obtain the imaging of each x-ray source, whole process time is extremely short, in whole process, the motion of device and travelling belt is negligible.
Preferably, use control chip control travelling belt to transmit examined object, make examined object accurately at the uniform velocity through two or more sets x-ray source arrays and corresponding detector array.
Preferably, described image reconstruction module adopts the iterative reconstruction algorithm based on compressed sensing.Because iterative approximation possesses good adaptability to irregular sample track, but number of samples is had relatively high expectations, use the algebraically iteration CT reconstruction algorithm based on compressed sensing, can go out reliable image with less sampling reconstruction.
Preferably, described image processing module adopts based on visualization processing, and the device cross that reconstruction is obtained looks like to carry out three-dimensional visualization, realizes arbitrary section and observes.Described image processing module adopts intelligent analysis system, adopts algorithm to carry out automatic analysis to rebuilding visualization result, and the requirement according to user to examined object, checks automatically, and the defective device of marks for treatment or people are for processing automatically.
In technical solution of the present invention, the inspection of product will be undertaken by following flow process: first, product to be detected enters travelling belt according to the streamline of factory and at the uniform velocity advances, when product runs to certain position, trigger photoelectricity gate controlled switch, at this moment, x-ray source control circuit triggers primary X-ray imaging, in primary X-ray imaging, control circuit will produce a series of control signals, control the transmitting of x-ray source frequency division, synchronous detector control circuit carries out instantaneous exposure saving result, above process completes within the utmost point short time, product during displacement negligible, afterwards, first by demodulation process, by the imaging of each x-ray source, from the result obtaining, demodulation is out, then by rebuilding module, carry out cross sectional reconstruction one time, travelling belt moves on simultaneously, with same circulation, complete the scanning of each tomography, object leaves X ray surveyed area, and now, computing machine is filed the tomography of rebuilding gained, finally, the volume data that computing machine forms layer data sequence is carried out three-dimensional visualization, and shows the cross section interested that user sets, flaw and the defect analysis of intellectual analysis to product, and the index of setting according to user makes an announcement.
With respect to scheme of the prior art, advantage of the present invention is:
1, application the present invention can significantly improve sweep velocity, completes fast product and detects, and improves the production efficiency of factory, saves economic spending.
2, the pipeline design thinking of using conveyor type in device, can embed in the streamline of factory, is enterprise's simple flow, convenient introduction.
3, in device, use fixing x-ray source and detector that the error that mechanical motion brings is significantly reduced, in addition, the power consumption of device reduces greatly, and has eliminated loss and the noise of mechanical motion, the maintenance cost of reduction equipment, i.e. environmental protection has improved again the life-span of equipment.
4, in device, use the x-ray source based on carbon nanotube cathod, than traditional radiographic source, power consumption declines to a great extent, and does not need hot operation, has reduced the problem of heat radiation aspect.
5, in device, adopt the array of x-ray source, the X ray transmitting work that script is completed by a radiographic source, shares multiple x-ray sources and carries out, and has greatly extended the serviceable life of x-ray source.
6, the frequency division multiplex technique that adopts x-ray source and detector in device, has effectively shortened the required time of sampling.
7, the CT reconstruction algorithm based on compressed sensing adopting in the present invention, has and efficiency high feature few to sampling angle requirement, can realize the effect of real-time reconstruction.In conjunction with 1,2,6 above advantages, at links, improved speed, be particularly suitable for the quick mass detection of product, be particularly suitable for for chip package the mass detection of electronic product and device.
In sum, the invention provides a kind of real-time online industry CT detection system based on x-ray source array, comprise x-ray source array and detector array set based on carbon nanotube cathod, for radiographic source, switch fast and synchronize the control device reading with detector, the travelling belt of examined object and motion control device, image is stored in filing system, iterative reconstruction algorithm based on compressed sensing is rebuild module and visual software and intelligent analysis system, belong to the system field of industry CT, can to object, carry out CT fault imaging in real time, 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 structural drawing of the real-time online industry CT detection system based on carbon nanotube cathod x-ray source array of the present invention;
Fig. 3 is the sample mode schematic diagram that uses two pairs of x-ray source arrays and detector array module;
Fig. 4 is the sample mode schematic diagram that uses three pairs of x-ray source arrays and detector array module;
Fig. 5 is the sample mode schematic diagram that uses four pairs of x-ray source arrays and detector array module;
Fig. 6 is the spatial arrangement schematic diagram that uses three pairs of x-ray source arrays and detector array module;
Fig. 7 is the spatial arrangement schematic diagram that uses four pairs of x-ray source arrays and detector array module;
Fig. 8 is the frequency division 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 the CT reconstruction algorithm 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 marker device 7, combine detection module and switch fast and synchronize the control device 8 reading with detector for x-ray source, image processing apparatus 9, travelling belt 30, x-ray source array 20 and the detector array 40 coordinating with this x-ray source array, the x-ray signal 21 with certain frequency that in x-ray source array, certain radiographic source produces, pilot lamp 81, emergency stop switch 82, main frame 80.
Embodiment
Below in conjunction with specific embodiment, such scheme is described further.Should be understood that these embodiment are not limited to limit the scope of the invention for the present invention is described.The implementation condition adopting in embodiment can be done further adjustment according to the condition of concrete producer, and not marked implementation condition is generally the condition in normal experiment.
As Fig. 2, be somebody's turn to do the real-time online industry CT detection system based on carbon nanotube cathod x-ray source array, comprise the travelling belt for transmitting examined object 1, the x-ray source array 20 of described travelling belt arranged outside carbon nanotube cathod and the detector array 40 that coordinates the CT that carries out examined object 1 to detect with the x-ray source array of carbon nanotube cathod, described system also comprises for carrying out x-ray source 20 to be switched fast and synchronizes the control device 8 reading with detector, the CT image detecting for obtaining detector array, carry out the image processing apparatus 9 of the Storage and Processing operation of CT image.Control device 8 is provided with main frame 80, for the EmS 82 of emergency treatment, show the status indicator lamp 81 of detected state.Between control device 8 and image processing apparatus 9, by cable, be connected.
Wherein core component is x-ray source array 20 based on carbon nanotube cathod and corresponding detector array (detector set) 40.This assembly is the x-ray source based on carbon nanotube cathod, row's detector and be configured to by a row.Support is U-shaped design, x-ray source based on carbon nanotube cathod is arranged in the hole of support one side, focus is towards the center of support, its basic circuit is linked outside by circuit, detector 40 is distributed in opposite one side of x-ray source 20, and each x-ray source and each detector have respectively apparatus for adjusting position.In the ideal case, the focus of all x-ray sources is positioned on straight line, and with detector in line parallel.In actual conditions, due to inevitable error, before use image is rebuild, need to calibrate.The x-ray source array of described carbon nanotube cathod and detector array are arranged in shielding case 6, in described shielding case 6, be also provided for carrying out the object marker device 7 of examined object mark, described examined object by travelling belt 30 from shielding case outside is imported shielding case into and is detected, carry out mark, then spread out of outside shielding case.
In this real-time online industry CT detection system based on carbon nanotube cathod x-ray source array, the x-ray source array based on carbon nanotube cathod is a row or multi-row with the use of corresponding detector set.Each pack module staggers mutually on x-ray source array direction, and module is used rotating shaft to be connected in frame, to carry out angular setting according to different demands.In adjustment, modules is link and keep parallel to each other.In the present invention, although Fig. 2 carries out imaging with two pairs of modules, but this is only an example, the present invention comprises the situation of using many group x-ray source arrays and detector array module imaging, wherein Fig. 3 comprises the situation of using three groups or four groups, if use more, can cost allow scope in obtain more intensive sample effect, to obtain better reconstruction effect.
The sample effect of module combination, as shown in Fig. 3 ~ 5, can be two groups, three groups even four groups of x-ray source arrays and detector array module.In Fig. 3 ~ 5, these x-ray source arrays and detector array module be all in same plane, and in fact, the sampling of each module is to carry out in different planes at synchronization, as shown in Figure 6,7.In Fig. 3 ~ 5, relative x-ray source array and detector array module are in a plane, another can be positioned over another parallel with it plane according to actual needs to module, every pair of module is mutually staggered, wherein Fig. 2 is shown in by space layout's schematic diagram of two pack modules, and the situation of three groups and four groups as shown in Figure 6,7.When object is in transmission, what each module was adopted is data the storage of article different cross section, because the speed of moving is by program setting, so the data acquisition fragment of a plane is known.Carrying out before the reconstruction of certain plane, image reconstruction module is first located the data storage location of this plane, then from corresponding position, takes out layer data and rebuild.
As shown in Fig. 8 ~ 9, in the present invention, also used the multiplexing imaging technique of a kind of frequency division, use different radiographic sources respectively take different frequency of exposure irradiating object (21 as x-ray source transmission frequency waveform) simultaneously, can obtain signal strength detection curve in the whole time shutter, and this curve is that the radiographic source light intensity curve of different frequency of exposure is with the result of certain weight linear superposition, by demodulation, just can obtain the weight of each radiographic source change curve, realize this radiographic source and obtained at the data for projection of this pixel.Traditional CT imaging mode is that radiographic source exposes respectively at diverse location.Because the x-ray source based on carbon nanotube cathod has that cost is low, volume is little, high time resolution, working temperature is low, power consumption is little and the advantage such as able to programme, uses this x-ray source to carry out high-frequency emission in this invention.Suppose that the multiplexing method of frequency division completes the same exposure than exposing with each radiographic source pointwise, the required time is shorter, thereby improves scan efficiency.
Figure 10 is the CT reconstruction algorithm based on compressed sensing.This reconstruction algorithm is conventional prior art, repeats no more.The inspection of native system product as shown in figure 11, will be undertaken by following flow process: first, product to be detected enters travelling belt according to the streamline of factory and at the uniform velocity advances, when product runs to certain position, trigger photoelectricity gate controlled switch, at this moment, x-ray source control circuit triggers primary X-ray imaging, in primary X-ray imaging, control circuit will produce a series of control signals, control the transmitting of x-ray source frequency division, synchronous detector control circuit carries out instantaneous exposure saving result, above process completes within the utmost point short time, product during displacement negligible, afterwards, first by demodulation process, by the imaging of each x-ray source, from the result obtaining, demodulation is out, then by rebuilding module, carry out cross sectional reconstruction one time, travelling belt moves on simultaneously, with same circulation, complete the scanning of each tomography, object leaves X ray surveyed area, and now, computing machine is filed the tomography of rebuilding gained, finally, the volume data that computing machine forms layer data sequence is carried out three-dimensional visualization, and shows the cross section interested that user sets, flaw and the defect analysis of intellectual analysis to product, and the index of setting according to user makes an announcement.
Above-mentioned example is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalent transformations that Spirit Essence does according to the present invention or modification, within all should being encompassed in protection scope of the present invention.
Claims (8)
1. the real-time online industry CT detection system based on x-ray source array, comprise and obtaining, the image processing apparatus of Storage and Processing CT image, shielding case (6) and be arranged on the object under test apparatus for placing in this shielding case, combine detection module and switch fast and synchronize the control device (8) reading with detector for x-ray source, it is characterized in that, described object under test apparatus for placing is travelling belt (1), described combine detection module is by the support that is positioned at travelling belt outside, and detector array (40) composition that is arranged on the x-ray source array (20) based on carbon nanotube cathod on support and coordinates with this x-ray source array, the x-ray source of described x-ray source array is multiple, the incident angle of each x-ray source circumferentially arranges along examined object.
2. the real-time online industry CT detection system based on x-ray source array according to claim 1, is characterized in that, the quantity of described combine detection module is no less than 2.
3. the real-time online industry CT detection system based on x-ray source array according to claim 1, is characterized in that, described system also comprises the conveyer that carries out examined object transmission operation for controlling travelling belt.
4. the real-time online industry CT detection system based on x-ray source array according to claim 1 and 2, it is characterized in that, when the quantity of described combine detection module is 2, two pack modules are mutually vertical fixing, and x-ray source and corresponding detector cover the sample range of 180 degree.
5. according to the real-time online industry CT detection system based on x-ray source array described in claim 1 or 3, it is characterized in that, described combine detection module is in same plane, and the sample range of x-ray source and corresponding detector covering 180 degree; Or combine detection module is in Different Plane, and the sample range of x-ray source and corresponding detector covering 180 degree.
6. the real-time online industry CT detection system based on x-ray source array according to claim 1, is characterized in that, described x-ray source and detector are provided with apparatus for adjusting position.
7. the real-time online industry CT detection system based on x-ray source array according to claim 1, it is characterized in that the image processing module that described image processing apparatus is provided with the CT image CT image memory module that receives and store that detector array is detected, the image reconstruction module that CT image is rebuild, image is carried out analyzing and processing and carries out visual output to user.
8. the real-time online industry CT detection system based on x-ray source array according to claim 1, is characterized in that, is also provided with the object marker device for carrying out examined object mark in described shielding case.
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