CN101329282B - Method and apparatus for centering radiation source and detector on nondestructive testing of large-scale component - Google Patents
Method and apparatus for centering radiation source and detector on nondestructive testing of large-scale component Download PDFInfo
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- CN101329282B CN101329282B CN 200710117691 CN200710117691A CN101329282B CN 101329282 B CN101329282 B CN 101329282B CN 200710117691 CN200710117691 CN 200710117691 CN 200710117691 A CN200710117691 A CN 200710117691A CN 101329282 B CN101329282 B CN 101329282B
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Abstract
The invention relates to the field of nuclear technology application, in particular to a method and the device completing centering and positioning under the condition that a radiation source is connected with a detector non-rigidly when large component nondestructive detection is carried out. The centering method of the invention used for the radiation source and the detector during the nondestructive detection of large components comprises the steps as follows: (a) the radiation source is roughly centered with the detector; (b) a centered shielding pattern is rotated to a shielding position; (c) the position of the shielding pattern is observed after the image forming; (d) the position from the radiation source to the shielding pattern is adjusted to a certain imaging error, thus completing the centering. The corresponding device of the invention comprises a centering positioning plate, the shielding pattern and a shielding collimator; wherein, the shielding pattern is arranged at the front end of the shielding collimator by the centering positioning plate. The method and the device of the invention realize the exact centering of the radiation source and the detector during the nondestructive detection application of large and super-large components, and can calculate the distance from the radiation source point to the detector, thus achieving the basic condition of the radiation image forming and completing the detection.
Description
Technical field
The present invention relates to the Application of Nuclear Technology field, particularly during the large-scale component Non-Destructive Testing, radiation source and detector do not have under the rigidly connected situation, finish the method and the device thereof of radiation source and detector centering, location.
Ray nondestructive inspection (NDI) technology has been widely used in numerous areas such as the safety inspection at airport, railway, harbour and Industrial Inferential Measurements; In Non-Destructive Testing was used, radiation source and detector centering were the pacing itemss of finishing detection.Traditional Non-Destructive Testing perhaps is rigidly connected between radiation source and detector in using, and perhaps object to be detected is less, and radiation source and detector can visual centerings.But when large-scale component or super-huge structure Non-Destructive Testing,, make the centering of radiation source and detector become problem owing to can't be rigidly connected or visual centering.Therefore, press for a kind of method and apparatus that can guarantee when the large-scale component Non-Destructive Testing, can carry out reliable contraposition.
At the defective of above-mentioned detection mode, the invention provides and a kind ofly block the method and apparatus of the centering of realizing radiation source and detector with radiation when being used for the large-scale component Non-Destructive Testing.
Provided by the invention when being used for the large-scale component Non-Destructive Testing centering method of radiation source and detector may further comprise the steps:
(a) with radiation source and detector centering roughly;
(b) the centering shielding patterns is rotated to block the position;
(c) check the image space of shielding patterns after the imaging;
(d) adjust radiation source to the image space of shielding patterns in certain error, finish centering.
Wherein the centering shielding patterns is that a rotatable mobile heavy metal rectangle blocks the ray pattern, and its thickness is 1/5～2 times of the half value thickness of this metal under the use ray energy, and its pattern center is positioned at the center of shielding collimator.
In step (d), if the position deviation center of shielding patterns then can calculate distance and the two the misalignment yardstick of radiation source source point to detector, imaging again after the adjustment by the size and the deviation value of image that this pattern becomes, until adjusting within certain error, finish the centering step.
Wherein said radiation source source point is as follows to the computing method of the distance of detector:
Known shielding patterns is L apart from the radiation source source point, the actual length of side A of shielding patterns, become image length of side i, the every pixel of image to represent physical length U, desiring to try to achieve the radiation source source point is M apart from detector, and geometric relationship is then arranged
Can draw
Be under the current putting position radiation source source point apart from the detector end distance from.
The described computing method that depart from yardstick are as follows:
Image that known shielding patterns becomes laterally or is vertically departing from radiation field centre bit h pixel, and the every pixel of image is represented physical length U, then real offset H=hU.
Preferably, described radiation source adopts accelerator or the radioisotopic portable high-energy ray source of using; To be DR imaging screen, CR image screen, dull and stereotyped scintillation screen cooperate one of scanister in conjunction with CCD camera or gas filled ionization chamber linear array detector, scintillator linear array detector, semiconductor line detector array with described detector.
Another aspect of the present invention provides a kind of centralising device of radiation source and detector when being used for the large-scale component Non-Destructive Testing, comprise centering location-plate, shielding patterns and shielding collimator, wherein said shielding patterns is arranged at the shielding collimator front end by the centering location-plate.
This centralising device comprises also and is used for the centering location-plate is fixed on set screw on the shielding collimator that set screw is fixed on the shielding collimator front end by the positioning screw hole of four jiaos of centering location-plates with the centering location-plate.
Described shielding patterns is that a rotatable mobile metal rectangular is blocked the ray pattern, and its thickness is 1/5～2 times of the half value thickness of this metal under the use ray energy, and its pattern center is positioned at the center of shielding collimator.
Preferably, described shielding patterns is embodied in a certain left-right symmetric or laterally zygomorphic figure, as sphere of movements for the elephants shape, and " king " intersection figure, " * " intersection figure etc.
Preferably, a side of described centering location-plate has turning axle, and shielding patterns is rotated by this turning axle, shielding patterns is rotated to block the position and can be used for centering; Rotate to the outside and be used for normal radiant image.
By the present invention, ray can be realized the accurate centering of radiation source and detector, and calculate the distance of radiation source source point apart from detector in Non-Destructive Testing large-scale, super-huge member is used, and makes it to reach the pacing items of radiant image, finishes detection.
Centering method of the present invention and centralising device are used for the Non-Destructive Testing field of large-scale component, as can be used for that the large-scale pipeline of cylinder, face body, beam body, large-sized boiler, nuclear power station large-scale pipeline and container, petroleum pipe line, natural gas line and container, petrochemical industry processing enterprise of buildings facade, end face, floor, bridge construction and container etc. are large-scale, the Non-Destructive Testing of super-huge member.Centering method of the present invention in addition and centralising device also can be used for numerous areas such as the safety inspection at traditional airport, railway, harbour and Industrial Inferential Measurements.
Description of drawings
Fig. 1 is in front view under the centering state for king's font blocks figure;
Fig. 2 shifts out the front view that blocks the position for king's font blocks figure;
Fig. 3 is in front view under the centering state for matrix pattern blocks figure;
Fig. 4 shifts out the front view that blocks the position for matrix pattern blocks figure.
Among the figure: 1, centering location-plate; 2, set screw; 3, shielding patterns; 4, turning axle; 5, shielding collimator; 6, positioning screw hole.
Embodiment
Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
The invention provides and a kind ofly utilize radiation to block to realize the method and apparatus of the centering of radiation source and detector, use suitable heavy metal shielding patterns at cone-beam radiation source collimator port, by this shielding patterns at the observable attenuation image of detector end, determine the relative position of radiation source and detector, solve the centering problem of radiation source and detector.
As shown in Figures 1 to 4, the device of this centering is made of centering location-plate 1, turning axle 4 and the shielding patterns 3 that is used for centering, is positioned shielding collimator 5 front ends by means of the positioning screw hole 6 of 1 four jiaos of set screw 2 and centering location-plates.Shielding patterns 3 helps the symmetry or the symmetrical pattern up and down of centering for king's font (as shown in Figure 1 and Figure 2) or matrix pattern (as shown in Figure 3, Figure 4) etc.The centering shielding patterns rotated to block the position and can be used for centering (shown in Figure 2) as Figure 13; Rotate to the outside and be used for normal radiant image (as Fig. 2, shown in Figure 4).That is to say, make shielding patterns move into or shift out with the mode of translation or rotation and block the position, thereby carry out after the centering of radiation source and detector and the centering radiant image normally.Cone beam of radiation wherein can be cone-beam or rectangular pyramid bundle.
Certainly, those skilled in the art should know, and the shielding patterns that also can adopt modes such as suspension, snapping will be used for centering moves into or shifts out blocks the position, thus realize in and radiant image after the centering.
In the present embodiment, radiation source adopts X-ray machine, accelerator, 60Co, 137Cs radioactive isotope; Detector is planar array detector or linear array detector, and the tie detector scanister is finished flat scanning.
Wherein radiation source can be X-ray machine, accelerator, radioactive isotope, and its energy is monoenergetic, dual intensity or multipotency, and energy range is at 100KeV～9MeV, and the ray visual angle is 15 °～30 °.To be DR imaging screen, CR image screen, dull and stereotyped scintillation screen cooperate one of scanister in conjunction with CCD camera or gas filled ionization chamber linear array detector, scintillator linear array detector, semiconductor line detector array with detector 3.
In the present invention, the centering shielding patterns is made by heavy metal, certain thickness is arranged, one-tenth-value thickness 1/10 is 1/5 half-value layer～2 half-value layer of this metal in used radiation source, be that thickness is 1/5～2 times of the half value thickness of this metal under the use ray energy, its pattern center is positioned at the center of shielding collimator.Shielding patterns all is parallel to the ray that is radiated to this place at all faces of thickness direction, thus shielding patterns at the image that is become near the radiation source end less than the image that is become away from the radiation source end.The radiation field that this radiation shielded image covers through collimation reaches more than 1/3.
The operation steps of centering method of the present invention is as follows: with radiation source and detector centering roughly; The centering shielding patterns rotated to block the position; Check the image space of shielding patterns after the imaging, if off-center, then can calculate distance and the two the misalignment yardstick of radiation source source point by the size (pixel count) and the deviation value (as the pixel count that departs from) of image that this pattern becomes to detector, imaging again after the adjustment, until adjusting within the admissible error, finish the centering step.
Wherein the computation process of putting position is as follows:
1, known shielding patterns is L apart from the radiation source source point, the actual length of side A of shielding patterns, become image length of side i (pixel), the every pixel of image to represent physical length U, desiring to try to achieve the radiation source source point is M apart from detector.Geometric relationship is then arranged
Can draw
Be under the current putting position radiation source source point apart from the detector end distance from.
2, image that known shielding patterns becomes departs from radiation field centre bit h pixel in horizontal (or vertically), and the every pixel of image is represented physical length U, then real offset H=hU.
In one of the present invention preferred embodiment, the cone-beam application extension to flat Shu Yingyong, is blocked 1/5 to 2/3 width that should be flat beam width in the figure with the line thickness of flat Shu Pinghang.Detector is the linear array detector that is parallel to flat bundle among the flat Shu Yingyong, obtain the attenuation figure that radiation source has shielding patterns with the relative radiation source lengthwise movement of detector, with the position and the big or small relative position that calculates radiation source and detector of shielding patterns among this figure, algorithm is the same with the cone-beam scheme.
Though the present invention specifically illustrates and illustrates in conjunction with a preferred embodiment; but the personnel that are familiar with this technical field are appreciated that; wherein no matter still can make various changes in detail in form, this does not deviate from spirit of the present invention and scope of patent protection.
Claims (6)
1. the centering method of radiation source when being used for the large-scale component Non-Destructive Testing and detector is characterized in that this method may further comprise the steps:
(a) with radiation source and detector centering roughly;
(b) the centering shielding patterns is rotated to block the position;
(c) check the image space of shielding patterns after the imaging;
(d) adjust radiation source to the image space of shielding patterns in certain error, finish centering;
The centering shielding patterns is that a rotatable mobile heavy metal rectangle blocks the ray pattern, and its thickness is 1/5～2 times of the half value thickness of this metal under the use ray energy.
2. the centering method of radiation source and detector when being used for the large-scale component Non-Destructive Testing as claimed in claim 1, it is characterized in that in step (d), if the position deviation center of shielding patterns, then can calculate distance and the two the misalignment yardstick of radiation source source point by the size and the deviation value of image that this pattern becomes to detector, imaging again after the adjustment, until adjusting within certain error, finish the centering step;
Described radiation source source point is as follows to the computing method of the distance of detector:
Known shielding patterns is L apart from the radiation source source point, the actual length of side A of shielding patterns, become image length of side i pixel, the every pixel of image to represent physical length U, desiring to try to achieve the radiation source source point is M apart from detector, and geometric relationship is then arranged
Can draw
Be under the current putting position radiation source source point apart from the detector end distance from;
The described computing method that depart from yardstick are as follows:
Image that known shielding patterns becomes laterally or is vertically departing from radiation field centre bit h pixel, and the every pixel of image is represented physical length U, then real offset H=hU.
3. the centering method of radiation source and detector when being used for the large-scale component Non-Destructive Testing as one of claim 1 to 2 is described is characterized in that described radiation source adopts accelerator or the radioisotopic portable high-energy ray source of using; To be DR imaging screen, CR image screen, dull and stereotyped scintillation screen cooperate one of scanister in conjunction with CCD camera or gas filled ionization chamber linear array detector, scintillator linear array detector, semiconductor line detector array with described detector.
4. the centralising device of radiation source when being used for the large-scale component Non-Destructive Testing and detector, it is characterized in that this device comprises centering location-plate (1), shielding patterns (3) and shielding collimator (5), wherein said shielding patterns (3) is arranged at shielding collimator (5) front end by centering location-plate (1), described shielding patterns (3) is that a rotatable mobile metal rectangular is blocked the ray pattern, its thickness is 1/5～2 times of the half value thickness of this metal under the use ray energy, and its pattern center is positioned at the center of shielding collimator (5).
5. the centralising device of radiation source and detector when being used for the large-scale component Non-Destructive Testing as claimed in claim 4, it is characterized in that also comprising being used for centering location-plate (1) is fixed on set screw (2) on the shielding collimator (5) that set screw (2) is fixed on shielding collimator (5) front end by the positioning screw hole of four jiaos of centering location-plates with the centering location-plate.
6. the centralising device of radiation source and detector when being used for the large-scale component Non-Destructive Testing as claimed in claim 4, a side that it is characterized in that described centering location-plate (1) has turning axle (4), shielding patterns (3) is rotated by this turning axle (4), shielding patterns is rotated to block the position and can be used for centering; Rotate to the outside and be used for normal radiant image.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200710117691 CN101329282B (en) | 2007-06-21 | 2007-06-21 | Method and apparatus for centering radiation source and detector on nondestructive testing of large-scale component |
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| CN 200710117691 CN101329282B (en) | 2007-06-21 | 2007-06-21 | Method and apparatus for centering radiation source and detector on nondestructive testing of large-scale component |
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| CN101329282B true CN101329282B (en) | 2011-03-09 |
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| CN102062867B (en) * | 2010-07-16 | 2012-08-08 | 马长征 | Simple, convenient and accurate device and method for vertically and horizontally adjusting three-dimensional scanning of radiation field |
| CN102645311B (en) * | 2011-12-12 | 2014-12-10 | 浙江吉利汽车研究院有限公司 | Centering method for rod crash test |
| CN103424415B (en) * | 2013-07-05 | 2015-11-04 | 公安部第三研究所 | X-ray locating and detecting device and position finding and detection method |
| CN104665853B (en) * | 2013-11-29 | 2019-01-15 | 上海联影医疗科技有限公司 | The centering bearing calibration of die body and multiray source X-ray equipment |
| CN106419941A (en) * | 2016-09-09 | 2017-02-22 | 沈阳东软医疗系统有限公司 | Correction method and device for achieving centering movement |
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| CN2466644Y (en) * | 2001-02-13 | 2001-12-19 | 黄裕宏 | X-ray centreline calibrater for movable X-ray machine |
| US6739751B2 (en) * | 2001-04-10 | 2004-05-25 | Ge Medical Systems Global Technology Company, Llc | X-ray system alignment method and apparatus |
| DE102005010659A1 (en) * | 2005-03-08 | 2006-09-14 | Siemens Ag | X-ray device |
| CN1915169A (en) * | 2005-08-18 | 2007-02-21 | 通用电气公司 | Method and apparatus to detect and correct alignment errors in x-ray systems used to generate 3d volumetric images |
| CN1963476A (en) * | 2005-11-09 | 2007-05-16 | 清华同方威视技术股份有限公司 | A centre alignment apparatus for ray bundle |
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Patent Citations (5)
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|---|---|---|---|---|
| CN2466644Y (en) * | 2001-02-13 | 2001-12-19 | 黄裕宏 | X-ray centreline calibrater for movable X-ray machine |
| US6739751B2 (en) * | 2001-04-10 | 2004-05-25 | Ge Medical Systems Global Technology Company, Llc | X-ray system alignment method and apparatus |
| DE102005010659A1 (en) * | 2005-03-08 | 2006-09-14 | Siemens Ag | X-ray device |
| CN1915169A (en) * | 2005-08-18 | 2007-02-21 | 通用电气公司 | Method and apparatus to detect and correct alignment errors in x-ray systems used to generate 3d volumetric images |
| CN1963476A (en) * | 2005-11-09 | 2007-05-16 | 清华同方威视技术股份有限公司 | A centre alignment apparatus for ray bundle |
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