CN200947087Y - Energy spectrum-modulated device and material-identified equipment - Google Patents
Energy spectrum-modulated device and material-identified equipment Download PDFInfo
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- CN200947087Y CN200947087Y CN 200620022988 CN200620022988U CN200947087Y CN 200947087 Y CN200947087 Y CN 200947087Y CN 200620022988 CN200620022988 CN 200620022988 CN 200620022988 U CN200620022988 U CN 200620022988U CN 200947087 Y CN200947087 Y CN 200947087Y
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Abstract
The utility model discloses an energy spectrum regulator and material distinguisher which can uses discern materials in large scale or medium sized objects including sea-tainer and air container. The utility model comprises a rotary shaft; a first energy spectrum regulator coupled with the rotary shaft; a second energy spectrum regulator which coupled with the rotary shaft and/or the first energy spectrum regulator. The utility model can be used in perform inspection of large scale containers in customs, ports and airports without opening the container.
Description
Technical field
The utility model relates to the radiation perspective imaging inspection to large-sized object, particularly a kind of power spectrum modulating device and material identification equipment, and it can utilize the radiation of different-energy to discern the material of material in the big-and-middle-sized objects such as sea-freight, air container.
Technical background
The Cargo Inspection System of existing employing radiant image generally all is to allow behind monoenergetic ray and the tested object interaction, surveys the ray that penetrates tested object and obtains image.This system can reflect the shape of tested object and the variation of mass thickness, but can not the recognition material material.
The dual intensity detection method realizes the differentiation of object materials attribute just is being suggested a long time ago, as U.S. Pat 5,044,002, and also be widely used in every field in low energy region, survey and the material identification of small article as osteoporosis inspection, geology oil reservoir.But, all think all the time high-energy section (＞1MeV) time, the minute differences that pair effect brings is not enough to realize the effect of material identification, so practicality is not very strong.
In the nineties, U.S. Pat 5,524,133 proposed to utilize the angle distribution character of Kang Pudun scattering and isotropic feature that electron pair produces analyze with the object effect after X ray in the scattering composition that causes of effect separately, thereby the atomic number of identification and the interactional material of X ray.At US5, in 524,133, allow interact again with by the higher target of atomic number behind the X ray of high energy and the object interaction, place detector in the different angles of target then, thereby survey Kang Pudun scattering and pair effect.But X ray behind the detection penetrating material and the scattering after the target effect are very difficult, so require the incident dose of X ray very high usually.In addition, the signal to noise ratio (S/N ratio) of detectable signal is very low, because the detector array of the same surface level of arranging by such angle is subject to the interference of neighboring trace, these shortcomings have a strong impact on the judgement to the material atom ordinal number, and picture quality is not good.So this method does not all obtain practical application after being suggested in 1993 always.
Afterwards, in U.S. Pat 6,069,936 and International Application No. WO 00/43760 in adopted by the high-energy ray source and produced X ray, by specific material X ray is carried out filtering, thereby obtain another more high-octane ray energy spectrum is arranged.Behind the X ray and matter interaction of these two power spectrums, survey two X ray after penetrating,, determine the atomic number and the material category of material by asking the ratio of two probe values.
This method is when the X ray of two power spectrums and tested object interaction, and along with the checking matter body thickness increases gradually, two power spectrum differences that penetrate tested object will be more and more littler, and convergent rapidly, can not discern tested object materials this moment.
The utility model content
In view of the problems of the prior art, finished the utility model.The purpose of this utility model is that (＞main the energy levels that 1MeV) produce two bundle power spectrums have the X ray of significant difference at high-energy section, survey the transmitted radiation after the same position effect of two beam lines and material, determine the effective atomic number scope of this material according to two probe values, and then realize non-intrusive inspection article.
Aspect one of the present utility model, a kind of power spectrum modulating device has been proposed, comprising: rotating shaft; The first power spectrum modulating part with the rotating shaft coupling; And with the second power spectrum modulating part of rotating shaft and/or first power spectrum modulating part coupling.
According to an embodiment of the present utility model, the described first power spectrum modulating part comprises at least one first blade; The described second power spectrum modulating part comprises at least one second blade.
According to an embodiment of the present utility model, described at least one first blade and described at least one second blade are crisscross arranged.
According to an embodiment of the present utility model, on the ray emission direction, the mass thickness of described at least one first blade is less than or equal to the mass thickness of described at least one second blade.
According to an embodiment of the present utility model, described at least the first blade is made of high Z material.
According to an embodiment of the present utility model, described at least one first blade is by constituting one of at least among Pb, W, U and the Cu.
According to an embodiment of the present utility model, described at least one second blade is made of low Z material.
According to an embodiment of the present utility model, described at least one second blade is by constituting one of at least in B, C, tygon and other the rich hydrogen organic materials.
The utility model has also proposed a kind of material identification equipment that comprises aforesaid power spectrum modulating device.
Utilize equipment of the present utility model alternately to produce the X ray of two kinds of different power spectrums, its power spectrum accounts for main ratio by the X ray that obvious capacity volume variance is arranged respectively.This helps the identification to thicker tested object.In addition, the high and low power X ray that produces carries out obtaining more optimal high low energy ray energy spectrum after the power spectrum modulation through different absorbing materials, a nearly step has been drawn back the equivalent energy difference of two beam X-rays, thereby improved accuracy, especially to the detection of less mass thickness material to material identification.
In addition, the detector of variable gain is adjusted gain amplifier at different the monopulse dosage and the ray energy of high low energy ray, obtains more great dynamic range, the Effect on Detecting of same detector be can further improve, Effect on Detecting and detection accuracy improved the ray of different-energy.
Description of drawings
Fig. 1 is the formation synoptic diagram according to the system for discriminating materials of the utility model embodiment;
Fig. 2 is the sectional view of the power spectrum modulating device in as shown in Figure 1 the system for discriminating materials;
Fig. 3 is the synoptic diagram of the power spectrum that produces of accelerator and the synoptic diagram that obtains the dual intensity power spectrum after ovennodulation.
In Fig. 4 shows between whole energy range, the function relation curve between emittance and material property and the material mass thickness;
Fig. 5 utilizes two rays of restrainting different-energies material to be surveyed and discerned the process flow diagram of material; And
Fig. 6 utilizes the different quality thickness information to adjust the method flow diagram of image.
Embodiment
The contrast accompanying drawing describes embodiment of the present utility model in detail below.
Fig. 1 is the formation synoptic diagram according to the system for discriminating materials of the utility model embodiment.
As shown in Figure 1, comprise RF linear accelerator 1, power spectrum modulating device 2, the synchro control part 4 that is connected with power spectrum modulating device 2 by circuit 3 and RF linear accelerator 1, the first collimating apparatus 6A, the second collimating apparatus 6B, the 3rd collimating apparatus 6C, the control section 9 that is connected with power spectrum modulating device 2 by circuit 10, pass through detector 8 that circuit 11 is connected with control section 9, pass through material identification and image processing section 13 that circuit 12 is connected with detector 8 according to the system for discriminating materials of the utility model embodiment.
In the present embodiment, alternately produce the X ray of two kinds of different-energies by RF linear accelerator 1, they act on same tested object 7 respectively, and survey the X ray that penetrates behind the tested object 7 by detector 8, result of detection by 13 pairs of detectors 8 of computing machine carries out analyzing and processing then, obtains the radiation image of tested object and realizes differentiation to tested object material properties.
As shown in Figure 1, in operating process, synchro control part 4 is set up session 5 with RF linear accelerator 1, and behind the affirmation state, RF linear accelerator 1 will alternately produce two kinds of X ray that the different-energy level is arranged according to cycle parameter and the control signal that synchro control part 4 provides.The power spectrum 1P of the X ray that RF linear accelerator 1 produces has tangible capacity volume variance, but can't satisfy the requirement of system applies, so need carry out the power spectrum modulation to power spectrum 1P, differs bigger two kinds of alpha spectrums of high low energy to obtain energy level.
Therefore, RF linear accelerator 1 can alternately produce the X ray of two different power spectrums according to trigger pip, and this two power spectrum accounts for main ratio by different energy respectively.Because its energy spectral limit of the X ray that accelerator produces is wideer, therefore need further improve the ratio of the X ray of institute's energy requirement in the X-ray spectrum by the method for power spectrum modulation.The energy height of the X ray that produces at RF linear accelerator 1 can adopt different materials to carry out the power spectrum modulation, thereby obtain the power spectrum that the most suitable material is differentiated.
In addition, because X-ray energy spectrum distribution energy scope difference, the power spectrum that is fit to modulation material is also different.For example, when the main energy range lower limit of a certain beam X-ray spectral distribution be higher than the higher threshold value of a certain energy (as～3MeV) time, should select the power spectrum modulation material of low Z material, as B, C, tygon and other rich hydrogen organic materials etc. as this beam X-ray.
Simultaneously, in order to absorb the scattering composition that energy is lower in the ray, preferably simultaneously after thicker low Z material carries out the power spectrum modulation, add thin high Z material again and carry out the power spectrum modulation.When the main energy range lower limit of a certain beam X-ray spectral distribution be higher than the lower threshold value of a certain energy (as～300keV) time, should select the power spectrum modulation material of high Z material, as Pb, W, U etc. as this beam X-ray; Z material such as Cu in also can selecting.
Fig. 2 is the vertical view of the power spectrum modulating device 2 in as shown in Figure 1 the system for discriminating materials.As shown in Figure 2, power spectrum modulating device 2 comprise with the rotating shaft 201 of servomotor coupling, be arranged on the first power spectrum modulating part 202 in the rotating shaft 201, with the second power spectrum modulating part 203 and the position detector (not shown) of the first power spectrum modulating part, 202 couplings.
Here, the first power spectrum modulating part 202 is to be made of and transfer axle 201 is coupled high Z material, is used for low energy ray is carried out power spectrum modulation.As shown in Figure 2, the first power spectrum modulating part 202 comprises a plurality of isolated various pieces, these a plurality of parts can be regarded as short blade.In this case, the first power spectrum modulating part 202 can be coupling on the second power spectrum modulating part 203, and the second power spectrum modulating part 203 directly is coupling in the rotating shaft 201.But scheme as an alternative can as required the blade of the first power spectrum modulating part 202 be made the shape of the blade that is similar to the second power spectrum modulating part 203, but the two has different mass thicknesses on directions of rays.Like this, the first power spectrum modulating part 202 can be coupling in the rotating shaft 201 with the second power spectrum modulating part 203.
The second power spectrum modulating part 203 is that low Z material constitutes, the compound material as the tygon leading, and make one or more blades, be used for high-energy ray is carried out the power spectrum modulation.As shown in Figure 2, the blade of the second power spectrum modulating part 203 is bigger than the mass thickness of the blade of the first power spectrum modulating part 202 along the mass thickness of ray emission direction.
In order to realize the power spectrum modulation, blade pivots according to the frequency of setting, when position detector detects blade and forwards a fixed position to, by producing a trigger pip, as synchronizing signal, send synchro control part 4 and control section 9 respectively to by circuit 3 and circuit 10, then synchronous by between synchro control part 4 and control section 9 control RF linear accelerators 1 and detector 8 and the power spectrum modulating device 2 respectively.
Like this, can guarantee that the high energy power spectrum ray that allows RF linear accelerator 1 produce all interacts with blade material, the modulation of the second power spectrum modulating part 2 just, and make the low energy power spectrum all pass through the absorbed on the axle, the modulation of the first power spectrum modulating part 1 just.
As mentioned above, the material of the first power spectrum modulating part 202 can be selected the power spectrum modulation material of high Z material as this beam X-ray, as Pb, W, U etc.; Z material such as Cu in also can selecting, and the material of the second power spectrum modulating part 203 can be selected the power spectrum modulation material of low Z material as this beam X-ray, as B, C, tygon and other rich hydrogen organic materials etc.As a result, obtain the high low energy ray energy spectrum 2P after ovennodulation, wherein the power spectrum of two kinds of different-energies is fully drawn back.
In addition, Fig. 3 is the synoptic diagram of the power spectrum that produces of accelerator and the synoptic diagram that obtains the dual intensity power spectrum after ovennodulation.Shown in Fig. 3 (A), the power spectrum before the modulation is that high energy is 9MeV, and low energy is spectrum curve 301a and the 301b after the normalization that produces of the dual intensity accelerator of 6MeV; Shown in Fig. 3 (B), be respectively spectrum curve 302a and 302b through the power spectrum after the power spectrum modulation.As can be seen from the figure, the difference of power spectrum is further drawn back in two.
Interacting with tested object 7 through the first and second accurate value device 6A, 6B collimation back through the optimum high low energy ray that obtains after 2 modulation of power spectrum modulating device.As shown in Figure 1, tested object 7 is moving towards a fixed route and fixed-direction perpendicular to radiator plane.Penetrating ray behind the tested object 7 is detected device 8 again and gathers behind the 3rd collimating apparatus 6C.Detector 8 is realized high low energy data according to the synchronizing signal of control system 9, for example collection of the intensity in transmission value behind the radiation perspective object.In addition, detector 8 can be according to its gain multiple of external trigger signal change, thereby change the dynamic range of detector 8, with the ray that obtains two kinds of energy more accurately and the signal value after the material effect, so that can distinguish the ray of two kinds of energy and the difference after the material effect exactly.For example, under the situation of the ray with different-energy, detector 8 has different gain multiples.
The outputting data signals of detector 8 is sent to material identification and image processing section 13 by circuit 12.As mentioned above, detector 8 is surveyed high energy probe value HEL that is and the low energy probe value LEL that obtains.By determining the effective atomic number scope of material in the tested object in the high energy probe value HEL that will survey and the low energy probe value LEL substitution classification function, thus the material properties of definite its material.
Here, the acquisition process of classification function be by to the material of known atomic number (as represent organic tygon, represent light metal aluminium, represent inorganics iron, represent the lead of heavy metal etc.), use the different mass thickness of ray scanning of two kinds of energy of dual intensity system respectively, obtain that a series of collection value realizes.High low energy signal to each collection is asked two functional values.For example ask In (HEL/HEL0) by high energy or low energy signal, ask a*{In (LEL/LEL0)-In (HEL/HEL0) by high low energy signal }, wherein a is a coefficient, HEL0 and LEL0 are respectively the predetermined reference probe values, then according to the function that fits of this material of statistical value match of this two functional value, as shown in Figure 4.
Then, according to statistical method (as K-means, leader cluster, vector machine), obtain the curve of classifying by fitting function.For example the fitting function value is carried out the variance statistics, optimal classification standard as requested moves corresponding variance yields to matched curve then.In identification during unknown material, according to two functional values of probe value, and calculate the classification function value of this probe value, relatively obtain the effective atomic number scope of this material then with the classification function value, and then determine the material properties of this object.
Fig. 5 be utilize two bundle different-energy rays material is surveyed the process flow diagram of discerning material.
As shown in Figure 5, at step S110, RF linear accelerator 1 can alternately produce the X ray of two different power spectrums according to trigger pip, and for example first X ray has first power spectrum, and second X ray has second power spectrum.
Then, at step S120, utilize the X ray of 2 pairs of different power spectrums of power spectrum modulating device as implied above to carry out the power spectrum modulation, for example under the control of synchronizing signal, 202 pairs first X ray of the first power spectrum modulating part carry out the power spectrum modulation, and 203 pairs second X ray of the second power spectrum modulating part carry out the power spectrum modulation.
Next, at step S130, the X ray after the modulation shines tested object 7 after passing through the first and second collimating apparatus 6A and 6B, and interacts with tested object 7.
At step S140, detector 8 is realized collection to high low energy data according to the synchronizing signal of control system 9.Here, detector 8 can be according to its gain multiple of external trigger signal change, thereby changes the dynamic range of detector 8, with the ray that obtains two kinds of energy more accurately and the signal value after the material effect.
At step S150, detector 8 is surveyed high low energy imaging signal send material identification and image processing section 13 to.In material identification and image processing section 13, judge that the signal that transmits is high energy imaging signal or low energy imaging signal.
At step S160 and step S170, respectively high energy X imaging signal and low energy imaging signal are handled.
At step S180, according to high energy and two functional values of low energy, and calculate the classification function value of this probe value, relatively obtain the effective atomic number scope of this material then with the classification function value, and then determine the material properties of this object.
At step S190, in order to obtain checking matter volume image clearly, can carry out fusion treatment to the multiple image that obtains behind the tested object of the different X-ray scanning of energy, obtain the better scan image of quality.
As everyone knows, high-energy ray is strong to the penetration power of object, and is higher to the detection data degree of accuracy that obtains after the big object penetration of mass thickness, so more clear to the big gray level image of mass thickness.But, high-energy ray will obtain relatively fuzzyyer gray level image when resolution approaches mass thickness, lose detailed information easily.And just being the gray level image that obtains behind the low-energy ray penetrating material, this shortcoming can remedy.
Fig. 6 utilizes the different quality thickness information to adjust the method flow diagram of image.This image co-registration process is utilized the differential declines characteristic of high low energy ray to object different quality thickness, and the fusion by two kinds of probe values obtains distinct image in broad mass thickness scope.
At step S191 and S192, determine the material properties of tested object, the mass thickness of for example tested object 7 is thick or thin.Here, according to the attenuation of ray, judge the approximate range of material mass thickness, promptly when decay is very serious,, think the high-quality thickness material for example less than predetermined threshold value, when decaying seldom,, think the inferior quality thickness material for example greater than predetermined threshold value.
At step S193,, give less weight factor for the high energy data, as 30% for the little material of mass thickness; Give bigger weight factor to low-yield data, as 70%.
At step S194,, give bigger weight factor for the high energy data, as 70% for the big material of mass thickness; Give less weight factor to the low energy data, as 30%.
Then, at step S195, according to above-mentioned weight factor of giving, high-energy synthetic image and low energy image, thus obtain final picture rich in detail.
So, the utility model proposes and make comparisons obtaining the probe value threshold value that pre-determines corresponding behind the X ray of different-energy and the matter interaction with it, give different weight factors respectively with low-energy data for high-energy, thus the synthetic half-tone information that obtains final image.
Though, behind the object interaction of ray to different quality thickness, the image that detection obtains has different picture characteristics, but after the said method processing, in the process that detects scanning object, mass thickness to tested object differs bigger material, can obtain gray level image very clearly equally.
The above; it only is the embodiment in the utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with the people of this technology in the disclosed technical scope of the utility model; the conversion that can expect easily or replacement all should be encompassed in of the present utility model comprising within the scope.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claims.
Claims (9)
1. a power spectrum modulating device is characterized in that, comprising:
Rotating shaft;
The first power spectrum modulating part with the rotating shaft coupling; And
The second power spectrum modulating part with rotating shaft and/or the coupling of the first power spectrum modulating part.
2. power spectrum modulating device as claimed in claim 1 is characterized in that, the described first power spectrum modulating part comprises at least one first blade; The described second power spectrum modulating part comprises at least one second blade.
3. power spectrum modulating device as claimed in claim 2 is characterized in that, described at least one first blade and described at least one second blade are crisscross arranged.
4. power spectrum modulating device as claimed in claim 2 is characterized in that, on the ray emission direction, the mass thickness of described at least one first blade is less than or equal to the mass thickness of described at least one second blade.
5. power spectrum modulating device as claimed in claim 2 is characterized in that, described at least the first blade is made of high Z material.
6. power spectrum modulating device according to claim 5 is characterized in that, described at least one first blade is by constituting one of at least among Pb, W, U and the Cu.
7. power spectrum modulating device according to claim 2 is characterized in that, described at least one second blade is made of low Z material.
8. power spectrum modulating device according to claim 7 is characterized in that, described at least one second blade is by constituting one of at least in B, C, tygon and other the rich hydrogen organic materials.
9. a material identification equipment that comprises the power spectrum modulating device is characterized in that, described material identification equipment comprises:
Rotating shaft;
The first power spectrum modulating part with the rotating shaft coupling; And
The second power spectrum modulating part with rotating shaft and/or the coupling of the first power spectrum modulating part.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200620022988 CN200947087Y (en) | 2006-05-19 | 2006-05-19 | Energy spectrum-modulated device and material-identified equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200620022988 CN200947087Y (en) | 2006-05-19 | 2006-05-19 | Energy spectrum-modulated device and material-identified equipment |
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| CN200947087Y true CN200947087Y (en) | 2007-09-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103703869A (en) * | 2011-08-16 | 2014-04-02 | 卡尔蔡斯医药技术股份公司 | Method and apparatus for generating x-ray radiation |
| CN103747605A (en) * | 2013-12-30 | 2014-04-23 | 西北核技术研究所 | X-ray energy spectrum modulation method aiming at specified energy spectrum form |
-
2006
- 2006-05-19 CN CN 200620022988 patent/CN200947087Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103703869A (en) * | 2011-08-16 | 2014-04-02 | 卡尔蔡斯医药技术股份公司 | Method and apparatus for generating x-ray radiation |
| CN103747605A (en) * | 2013-12-30 | 2014-04-23 | 西北核技术研究所 | X-ray energy spectrum modulation method aiming at specified energy spectrum form |
| CN103747605B (en) * | 2013-12-30 | 2016-01-20 | 西北核技术研究所 | A kind of X-ray energy spectrum modulator approach for specifying power spectrum form |
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Address after: 100084 Tsinghua University, Beijing, Haidian District Co-patentee after: Nuctech Company Limited Patentee after: Tsinghua University Address before: 100084 Tsinghua University, Beijing, Haidian District Co-patentee before: Qinghua Tongfang Weishi Tech Co.,Ltd. Patentee before: Tsinghua University |
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Granted publication date: 20070912 Termination date: 20130519 |