CN100520291C - Method for establishing optimum transillumination parameter system of industry digital radial imaging detecting - Google Patents
Method for establishing optimum transillumination parameter system of industry digital radial imaging detecting Download PDFInfo
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Abstract
The invention discloses a method for establishing an optimal perspective parameter system for industrial digital ray image test, which solves the problem associated with prior X-ray digital image test that no correct industrial digital ray image test can be carried out due to lack of the method for establishing an optimal perspective parameter system, and provides a reliable and effective optimal parameter-selecting system for the industrial digital ray image test. The method is: (1) determining the thickness of the work piece to be tested; (2) establishing the curve of U(Kv) swung dash d(mm) on the imaging system; (3) forming the reference curve for U(Kv) swung dash Im(mA) selecting the perspective parameters for modeling the imaging system; (4) fitting the curve from (2) and (3), obtaining the corresponding optimal perspective parameters and the mathematic expression of the modeling parameters; (5) establishing the optimal perspective parameter based on (2) and (3); (6) obtaining the digital image of the work piece meeting class B test.
Description
Technical field
The present invention relates to a kind of method for establishing optimum transillumination parameter system, relate in particular to a kind of industrial digital radial imaging and detect method for establishing optimum transillumination parameter system.
Background technology
In industrial X-ray detection field, use traditional film detection system always, so the system of selection of optimum transmitting illumination parameter all is based on the film system existence, the system of selection of numerous parameters all is the setting of film detection system as transillumination voltage and current and transillumination time.Along with the development of technology, be applied in X-ray detection field based on the detection system of digital detector imaging.This digital detector system is different from film fully, and therefore the optimum transmitting illumination parameter system of selection based on film has not been suitable for present X-ray digital imaging detection system.
The shortage of method for establishing optimum transillumination parameter system in the Digital Detecting, the selection transmitting illumination parameter that the user can only be blindly is difficult to find best parameter, has reduced the applicability of technology, has limited the development of technology.
Summary of the invention
Purpose of the present invention is exactly in order to solve the shortage of optimal system transmitting illumination parameter system method for building up in the existing X-ray digital imaging detection, cause correctly to carry out problems such as industrial digital radial imaging detection, provide a kind of industrial digital radial imaging to detect method for establishing optimum transillumination parameter system, industrial digital radial imaging is detected possess a reliable and effective optimized parameter selective system.
The present invention adopts following technical scheme for achieving the above object:
A kind of industrial digital radial imaging detects method for establishing optimum transillumination parameter system, and its method is,
(1) definite thickness of workpiece d that will on the digital radial detection system, detect, unit is mm, if not steel then carries out the thick conversion of equivalent steel;
(2) on imaging system, be independent variable with detected thickness of workpiece d, set up abscissa axis; With the transillumination voltage U is that X-X-ray machine X voltage is dependent variable, sets up axis of ordinates, and the formation form is: the curve of U-d relation, and wherein the unit of transillumination power supply U is kV, the unit of detected thickness of workpiece d is mm; The curve of relation; Each data is to (U in this curve, d) locate, all obtain soft ray filtering parameter, backshield, transillumination electric current, focal length, correction parameter, the optimum value of transillumination time according to test, requirement is carried out transillumination according to above-mentioned parameter to workpiece and is detected on imaging system, can make the image quality of detected workpiece reach the highest B level of film camera;
(3) with the thickness d of current object to be detected on the imaging system, obtaining corresponding transillumination voltage U according to (2), is that independent variable is set up abscissa axis with U; According to the gray threshold of digital detector bright field modeling defined, utilize soft ray filtering parameter, transillumination time, focal length corresponding in (2) again, under the empty screen of detector transillumination, obtain the system modelling electric current I according to test
m, with I
mSet up axis of ordinates for dependent variable, be formed into picture system modelling transmitting illumination parameter and select reference curve U-I
m, wherein the unit of U is kV, I
mUnit be mA;
(4) curve in match (2) and (3) obtains corresponding optimum transmitting illumination parameter and modeling parameters mathematic(al) representation;
(5) the optimum transmitting illumination parameter of setting up according to (2) and (3), imaging system is before carrying out the digital imagery detection to workpiece, at first, determine transillumination voltage, soft ray filtering parameter, focal length parameter value, be adjusted to correcting state to be prepared then according to (2) according to the thickness d of detected workpiece; Pass through the transillumination voltage U of d correspondence again, according to the system modelling electric current I in (3)
m, proofread and correct and set up calibration model to being in imaging system to be corrected;
(6) to being in the system that is corrected state, before detector, place detected workpiece, and workpiece is carried out the transillumination imaging according to the alpha ray shield parameter in (2), transillumination time parameter, transillumination current parameters, being of obtaining meets the workpiece digital picture that the B level detects quality requirements.
In the described step (3) the system modelling electric current get under the current voltage near saturation value; Frame frequency and image overlay average number of times and the detection efficiency of transillumination time by the detector regulation requires common decision; The gradation of image that system modelling obtains will satisfy the threshold value requirement.
In the described step (5) imaging system is carried out the modeling timing, do not place detected workpiece on the imaging system.
Among the present invention:
1) determines that optimum transmitting illumination parameter system sets up principle: detect quality most important index-image quality indicator IQI sensitivity is target to characterize in the industrial X-ray detection.Adopt the silk type image quality indicator of stipulating among JB4730-2005 and the national military standard GJB1187A-2001.
2) determine that the equivalent steel of detected workpiece is thick (if workpiece material is not a steel, then carry out the thickness conversion according to appendix F among the GJB1187A-2001) be independent variable (abscissa axis), thick down with each equivalent steel, the transillumination voltage that reaches the requirement of B level is dependent variable (axis of ordinates), sets up U (Kv)～d (mm) relation curve.
3) in each of curve to (or each section) (U, d) on, by theoretical analysis and test figure, provide the reference that is provided with of key parameters such as soft ray filtering (comprising filtering material and filtering thickness of slab), backshield, focal length, transillumination electric current, transillumination time, detector correction.Wherein the transillumination electric current get under the current voltage near saturation value; Frame frequency and image overlay average number of times and the detection efficiency of transillumination time by the detector regulation requires common decision; The gradation of image that system modelling obtains will satisfy the threshold value requirement.
4) set up the reference of optimal system correction parameter.With the transillumination voltage U under the current thickness is independent variable (abscissa axis), based on the bright field gray threshold of detector regulation, adopts filtering parameter, transillumination time, focal length in the curve, obtains the modeling electric current by test, as dependent variable (axis of ordinates).Set up the calibration model parameter be provided with reference in, place work piece not before the screen.
5) mathematic(al) representation of the transmitting illumination parameter reference curve of match X-ray digital imaging detection system and modeling parameters reference curve, be convenient to software programming, make in the software of detection system and can obtain transmitting illumination parameter automatically: only need the equivalent steel of input object to be detected thick, just can provide relevant transmitting illumination parameter by the mathematic(al) representation that injects software.
Beneficial effect of the present invention: provided digital radial optimum transmitting illumination parameter system sets up in detecting method, optimized parameter reference curve model and mathematic(al) representation, key parameter is concentrated in a curve or the one group of mathematic(al) representation, from use angle, quick and easy, for the user provides reliable and effective reference, can be familiar with soon and grasp being different from the digital radial imaging detection system that film detects, improve detection efficiency and quality, promote technological progress.
Description of drawings
Fig. 1 is based on the optimum transmitting illumination parameter reference curve and the mathematic(al) representation of the X-ray digital imaging detection of amorphous silicon planar array detector Paxscan2520;
Fig. 2 is based on the optimal system correction parameter reference curve and the mathematic(al) representation of the X-ray digital imaging detection of amorphous silicon planar array detector Paxscan2520;
Fig. 3 is above-mentioned in amorphous silicon planar array detector Paxscan2520 imaging system, according to the definite transmitting illumination parameter of setting up of optimum transmitting illumination parameter system, the detected weld seam digital picture of acquisition.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment.
The used X-ray machine X of digital radial detection system of Fig. 1 representative is the machine of the MCG320 model of German YXLON company, maximum transillumination voltage 320Kv, and the 0.8/1.8 bifocus, native system adopts large focal spot 1.8; The digital imagery plate is the PS2520 model of U.S. Varian company; System's fixed focal length is 1100mm; Object to be detected is the step bar that steel makes; Filtering material selection brass; Electric current among the figure under each voltage location is the maximum current that X-ray machine X allows under the current voltage; Image transillumination stack frame number is 16.
The parameter that is provided with in the digital radial detection system modeling process of Fig. 2 representative, wherein model image is by the stack of 128 frames, and frame frequency was 2 frame/seconds, and focal length is 1100mm, and the filtering material is a brass, selects the large focal spot of X-ray machine X for use.
In practical engineering application, at first determine the material and the thickness d of object to be detected ', if not steel then carries out the thick conversion of equivalent steel; On the abscissa axis of the reference curve of optimum transmitting illumination parameter, locate the position of d ', read the corresponding voltage U that reaches B level detection quality of d ' along the longitudinal axis ', simultaneously read other the transmitting illumination parameter values that need determine such as soft ray filtering parameter, backshield parameter, focal length, transillumination time, transillumination current value in the corresponding region of (U ', d '); Also on optimum calibration model parametric line, read the modeling electric current I according to U '
m' and the parameter that need determine during other modeling.For example carry out digital imagery when detecting at butt welded seam, determined above-mentioned parameter after, at first according on the calibration model reference curve of optimum modeling (U ', I
m') and other correlation parameter set up the system compensation model, the parameter butt welded seam that provides according to the transmitting illumination parameter reference curve of optimum transmitting illumination parameter system carries out the X-sensitivity of film then, being of then obtaining meets the image that the B level detects quality requirements.Determine the material and the thickness d of object to be detected ', if not steel then carries out the thick conversion of equivalent steel; Locate the position of d ' on the abscissa axis of the reference curve of optimum transmitting illumination parameter, read the corresponding voltage U that reaches B level detection quality of d ' along the longitudinal axis ', simultaneously read other the transmitting illumination parameter values that need determine such as soft ray filtering parameter, backshield parameter, focal length, transillumination time, transillumination current value in the corresponding region of (U ', d '); Also on optimum calibration model parametric line, read the modeling electric current I according to U '
m' and the parameter that need determine during other modeling.
Carry out digital imagery when detecting at butt welded seam, at first according on the calibration model reference curve of optimum modeling (U ', I
m') and other correlation parameter set up the system compensation model, the parameter butt welded seam that provides according to the transmitting illumination parameter reference curve of optimum transmitting illumination parameter system carries out the X-sensitivity of film then, being of then obtaining meets the image that the B level detects quality requirements.
Embodiment 1:
Among Fig. 1, provided technical chart and the mathematic(al) representation and the image thereof of the X-ray digital imaging detection system of Paxscan2520:
Fig. 2 has provided the calibration model parametric line of the X-ray digital imaging detection system of Paxscan2520, and Fig. 3 is the 17.5mm weld image based on the optimum transmitting illumination parameter system of Paxscan2520.
Weld material: steel; Optimum transmitting illumination parameter: voltage 170Kv, electric current: 11mA, filtering parameter: 1mm brass, shielding parameter: 4mm lead window mouth around the weld seam, focal length: 1100mm, transillumination time: 8s; Optimum modeling parameters: voltage 170Kv, electric current: 0.9mA, filtering parameter: 1mm brass, focal length: 1100m transillumination time: 8s; Wherein No. 13 silk is the B level requirement of stipulating among the mechanical industry standard JB4730-2005.
Claims (3)
1, a kind of industrial digital radial imaging detects method for establishing optimum transillumination parameter system, it is characterized in that, may further comprise the steps:
(1) definite thickness of workpiece d that will on the digital radial detection system, detect, unit is mm, if not steel then carries out the thick conversion of equivalent steel;
(2) on imaging system, be independent variable with detected thickness of workpiece d, set up abscissa axis; With the transillumination voltage U is that X-X-ray machine X voltage is dependent variable, sets up axis of ordinates, and the formation form is: the curve of U-d relation, and wherein the unit of transillumination voltage U is kV, the unit of detected thickness of workpiece d is mm; Each data is to (U in this curve, d) locate, all obtain soft ray filtering parameter, backshield, transillumination electric current, focal length, correction parameter and the optimum value of transillumination time according to test, on imaging system, obtain soft ray filtering parameter, backshield, transillumination electric current, focal length, correction parameter and the optimum value of transillumination time and workpiece is carried out transillumination detect, make the image quality of detected workpiece reach the highest B level of film camera according to test;
(3) with the thickness d of current detected workpiece on the imaging system, obtaining corresponding transillumination voltage U according to (2), is that independent variable is set up abscissa axis with U; According to the gray threshold of digital detector bright field modeling defined, utilize soft ray filtering parameter, transillumination time and focal length corresponding in (2) again, under the empty screen of detector transillumination, obtain imaging system modeling electric current I according to test
m, with I
mSet up axis of ordinates for dependent variable, be formed into picture system modelling transmitting illumination parameter and select reference curve U-I
m, wherein the unit of U is kV, I
mUnit be mA;
(4) curve in match (2) and (3) obtains corresponding optimum transmitting illumination parameter and modeling parameters mathematic(al) representation;
(5) the optimum transmitting illumination parameter of setting up according to (2) and (3), imaging system is before carrying out the digital imagery detection to workpiece, at first according to the thickness d of detected workpiece, determine transillumination voltage, soft ray filtering parameter and focal length parameter value according to (2), imaging system is adjusted to correcting state to be prepared then; Pass through the transillumination voltage U of d correspondence again, according to the system modelling electric current I in (3)
m, proofread and correct and set up calibration model to being in imaging system to be corrected;
(6) to being in the imaging system that is corrected state, before detector, place detected workpiece, and workpiece is carried out the transillumination imaging according to the alpha ray shield parameter in (2), transillumination time parameter and transillumination current parameters, being of obtaining meets the workpiece digital picture that the B level detects quality requirements.
2, a kind of industrial digital radial imaging according to claim 1 detects method for establishing optimum transillumination parameter system, it is characterized in that imaging system modeling electric current in the described step (3) get under the current voltage near saturation value; Frame frequency and image overlay average number of times and the detection efficiency of transillumination time by the detector regulation determines jointly; The gradation of image that the imaging system modeling obtains will satisfy the threshold value requirement.
3, a kind of industrial digital radial imaging according to claim 1 detects method for establishing optimum transillumination parameter system, it is characterized in that in the described step (5) imaging system being carried out the modeling timing, does not place detected workpiece on the imaging system.
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| CN103471535A (en) * | 2013-09-06 | 2013-12-25 | 航天材料及工艺研究所 | Method using photographic density value to measure homogeneous material thickness |
| CN106093080A (en) * | 2016-01-14 | 2016-11-09 | 南昌航空大学 | A kind of metal alloy compositions scattering ratio measuring method based on digital radial imaging technology explorer response curve |
| CN105973916B (en) * | 2016-04-26 | 2018-11-20 | 中国兵器工业集团第五三研究所 | The production method that breakthrough curve is used in the detection of composite material X-ray digital imagery |
| CN110174419A (en) * | 2019-05-17 | 2019-08-27 | 中国石油化工股份有限公司 | The detection method of in-service air cooler tube bundle based on X-ray digital imaging technology |
| CN110736758B (en) * | 2019-10-18 | 2022-04-19 | 西安航天动力机械有限公司 | Method for determining head welding seam transillumination arrangement parameters |
| CN111458356A (en) * | 2020-04-14 | 2020-07-28 | 国网湖南省电力有限公司 | Auxiliary device for radiographic inspection of substation equipment |
| CN113702408B (en) * | 2021-09-18 | 2024-04-09 | 中国航空制造技术研究院 | X-ray detection method for variable-thickness silicon carbide fiber composite material |
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