CN114199905B - Space positioning method and system for internal defects of casing - Google Patents
Space positioning method and system for internal defects of casing Download PDFInfo
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- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
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Abstract
The invention discloses a space positioning method and a system for defects in a machine case, wherein after the machine case is installed on a rotary platform, the method firstly adopts an X-ray transillumination mode to obtain plane coordinates of the defects on the dimension of a film projection surface, then changes the relative positions between an X-ray source and a workpiece and respectively performs film imaging, so that the relative displacement of defect images in two films formed before and after the position change is generated, and the height position coordinates of the defects on the dimension vertical to the film projection surface are calculated by utilizing a parallax method, thereby determining the positions of the defects in the machine case based on the plane coordinates and the height position coordinates of the defects, automatically performing the whole positioning process without manual intervention, and positioning a unique position in a three-dimensional space by adopting the projection plane coordinates and the height position coordinates, thereby realizing accurate positioning of the defects in the machine case with high positioning precision and effectively reducing the repairing difficulty.
Description
Technical Field
The invention relates to the technical field of nondestructive testing, in particular to a space positioning method and a space positioning system for internal defects of a casing.
Background
Aero-engines, known as the heart of an aircraft, are the source of power for the aircraft, while the casing is the load-carrying ligament that continuously transmits the powerful thrust of the aero-engine to the aircraft, which is one of the key components that determine the performance of the engine. With the continuous development of the technology, the technical difficulty of the casting process of the casing is increased, and simultaneously, higher requirements on flexibility, intelligence, sensitivity, reliability and the like of a nondestructive testing technology are also provided. If the nondestructive testing technology can not find and accurately position the internal defect position of the casing in time, huge hidden trouble can be necessarily brought to repair of an accessory casing of the aeroengine, an air inlet casing and the like of the aeroengine and the service performance and the safety and reliability of the whole aircraft. In the aviation industry at present, the space positioning method of defects such as redundancy in a casing mainly depends on subjective judgment of film evaluation personnel based on X-ray film imaging, and has the problems of large defect positioning error, difficult repair and the like.
Disclosure of Invention
The invention provides a space positioning method and a system for internal defects of a casing, which aim to solve the technical problem of large positioning error in the prior art in a mode of judging the positions of defects by adopting artificial X-ray film imaging.
According to one aspect of the present invention, there is provided a method for spatially locating an internal defect of a casing, including:
mounting the casing on a rotary platform;
the method comprises the steps of fixing a case, performing film imaging by using an X-ray transilluminator, establishing a plane rectangular coordinate system by taking the length direction of a film as an X axis, the width direction as a Y axis and the midpoint of the length direction of the film as an origin, and obtaining the plane coordinates of defects on the dimension of a film projection surface;
changing the relative position between the X-ray source and the workpiece, and respectively performing film imaging to enable the defect images in two films formed before and after the position change to generate relative displacement, and calculating to obtain the height position coordinates of the defects in the dimension vertical to the film projection surface by adopting a parallax method;
the position of the defect in the casing is located based on the plane coordinates and the height position coordinates of the defect.
Further, the process of changing the relative positions between the X-ray source and the workpiece and performing film imaging respectively to enable the defect images in two films formed before and after the position change to generate relative displacement, and calculating the height position coordinates of the defect on the dimension perpendicular to the film projection plane by adopting a parallax method specifically comprises the following steps:
and establishing a space rectangular coordinate system by taking the length direction of the film as an X axis, the width direction as a Y axis and the midpoint of the length direction of the film as an origin, fixing the case, respectively imaging the film at two different positions of a parallel film plane by using the X-ray source, recording the moving distance of the X-ray source and the moving distance of a defect image in two film images, and calculating the height position coordinate of the defect in the dimension vertical to the film projection plane by using a first parallax method model.
Further, the first parallax method model is as follows:wherein Z represents the height position coordinate of the defect in the dimension vertical to the projection plane of the film, D represents the moving distance of the defect image in the two film images, S represents the moving distance of the X-ray source, and L represents the focal length of the X-ray source.
Further, the X-ray source adopts a vertical irradiation mode or an oblique irradiation mode.
Further, the process of changing the relative positions between the X-ray source and the workpiece and performing film imaging respectively to enable the defect images in two films formed before and after the position change to generate relative displacement, and calculating the height position coordinates of the defect on the dimension perpendicular to the film projection plane by adopting a parallax method specifically comprises the following steps:
and (3) establishing a column coordinate system by using a rotating shaft of the rotating platform, horizontally transilluminating the casing by using a fixed X-ray source, rotating the casing, and calculating the spatial position coordinate of the defect in the column coordinate system by adopting a parallax method based on films imaged before and after the rotation of the casing, thereby obtaining the height position coordinate of the defect in the dimension vertical to the film projection surface.
Further, the process of calculating the spatial position coordinates of the defect in the cylindrical coordinate system based on the film imaged before and after the rotation of the receiver by adopting the parallax method to obtain the height position coordinates of the defect in the dimension perpendicular to the projection plane of the film specifically comprises the following steps:
the arc length of a moving track of a defect image in the two films before and after the rotation of the machine case, the rotation angle of the machine case, the focal length of the X-ray source and the distance from the film to the rotation shaft are obtained, and the polar diameter of the defect in the cylindrical coordinate system is obtained by calculation through a second parallax method model, so that the spatial position coordinate of the defect in the cylindrical coordinate system is obtained.
Further, the second parallax method model is as follows:wherein R represents the polar diameter of the defect in a cylindrical coordinate system, θ represents the rotation angle of the case, L represents the focal length of the X-ray source, < >>The arc length of the moving track of the defect image in the two films before and after rotation is shown, and r is the distance from the film to the rotating shaft.
In addition, the invention also provides a space positioning system for the internal defects of the casing, which comprises:
the plane coordinate analysis module is used for establishing a plane rectangular coordinate system by taking the length direction of the film as an X axis, the width direction as a Y axis and the midpoint of the length direction of the film as an origin after the machine case is mounted on the rotary platform and the machine case is fixed, and obtaining the plane coordinate of the defect on the dimension of the projection plane of the film after the film is imaged by utilizing the X-ray transilluminating machine case;
the height position coordinate analysis module is used for changing the relative positions between the X-ray source and the workpiece and respectively imaging films, so that after the relative displacement of the defect images in two films formed before and after the position change, the height position coordinate of the defect in the dimension vertical to the film projection surface is calculated by adopting a parallax method;
and the positioning analysis module is used for positioning the position of the defect in the casing based on the plane coordinates and the height position coordinates of the defect.
Further, the height position coordinate analysis module establishes a space rectangular coordinate system by taking the length direction of the film as an X axis, the width direction of the film as a Y axis and the midpoint of the length direction of the film as an origin, and after film imaging is respectively carried out at two different positions of a parallel film plane by utilizing the X-ray source while the fixed case is stationary, the moving distance of the X-ray source and the moving distance of a defect image in two film imaging are recorded, and the height position coordinate of the defect in the dimension vertical to the film projection plane is calculated by utilizing a first parallax method model.
Further, the height position coordinate analysis module builds a column coordinate system by using a rotating shaft of the rotating platform, and after the fixed X-ray source horizontally transilluminates the casing and rotates the casing, the parallax method is adopted to calculate and obtain the space position coordinate of the defect in the column coordinate system based on films imaged before and after the casing rotates, so as to obtain the height position coordinate of the defect in the dimension vertical to the film projection surface.
The invention has the following effects:
according to the space positioning method for the defects in the machine case, after the machine case is installed on the rotary platform, the plane coordinates of the defects in the film projection plane dimension are obtained by adopting an X-ray transillumination mode, then the relative positions between the X-ray source and the workpiece are changed, film imaging is respectively carried out, so that the relative displacement is generated between the defect images in two films formed before and after the position change, the height position coordinates of the defects in the direction perpendicular to the film projection plane dimension are calculated by utilizing a parallax method, the positions of the defects in the machine case can be determined based on the plane coordinates and the height position coordinates of the defects, the whole positioning process is automatically carried out without manual intervention, and the unique positions in the three-dimensional space can be positioned by adopting the projection plane coordinates and the height position coordinates, so that the accurate positioning of the defects in the machine case can be realized, the positioning precision is high, and the repairing difficulty is effectively reduced.
In addition, the space positioning system for the internal defects of the casing has the advantages.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 is a flow chart of a method for spatially locating an internal defect of a casing according to a preferred embodiment of the present invention.
Fig. 2 is a schematic view showing a structure in which a case is mounted on a rotary table and an X-ray source is mounted on a six-axis robot in a preferred embodiment of the present invention.
FIG. 3 is a schematic diagram of the coordinate locations of defects on a film projection surface in a preferred embodiment of the present invention.
Fig. 4 is a schematic diagram of a space rectangular coordinate system established by taking the length direction of a film as the X axis, the width direction as the Y axis, and the midpoint of the length direction of the film as the origin in the preferred embodiment of the present invention.
Fig. 5 is a schematic diagram of a first parallax method model in a preferred embodiment of the present invention.
Fig. 6 is a schematic diagram of a second parallax method model according to another embodiment of the present invention.
Fig. 7 is a schematic block diagram of a spatial localization system for internal defects of a casing according to another embodiment of the present invention.
Detailed Description
Embodiments of the invention are described in detail below with reference to the attached drawing figures, but the invention can be practiced in a number of different ways, as defined and covered below.
As shown in fig. 1, a first embodiment of the present invention provides a method for spatially locating an internal defect of a casing, including the following steps:
step S1: mounting the casing on a rotary platform;
step S2: the method comprises the steps of fixing a case, performing film imaging by using an X-ray transilluminator, establishing a plane rectangular coordinate system by taking the length direction of a film as an X axis, the width direction as a Y axis and the midpoint of the length direction of the film as an origin, and obtaining the plane coordinates of defects on the dimension of a film projection surface;
step S3: changing the relative position between the X-ray source and the workpiece, and respectively performing film imaging to enable the defect images in two films formed before and after the position change to generate relative displacement, and calculating to obtain the height position coordinates of the defects in the dimension vertical to the film projection surface by adopting a parallax method;
step S4: the position of the defect in the casing is located based on the plane coordinates and the height position coordinates of the defect.
It can be understood that, in the method for spatially positioning the defect inside the casing according to the embodiment, after the casing is mounted on the rotary platform, the planar coordinate of the defect on the film projection plane dimension is obtained by adopting an X-ray transilluminating manner, then the relative positions between the X-ray source and the workpiece are changed and film imaging is performed respectively, so that the defect images in two films formed before and after the position change generate relative displacement, and the height position coordinate of the defect on the dimension perpendicular to the film projection plane is calculated by utilizing a parallax method, so that the position of the defect inside the casing can be determined based on the planar coordinate and the height position coordinate of the defect, the whole positioning process is automatically performed without manual intervention, and the unique position in the three-dimensional space can be positioned by adopting the projection planar coordinate and the height position coordinate, thereby realizing accurate positioning of the defect inside the casing with high positioning precision and effectively reducing the repairing difficulty.
It will be appreciated that, as shown in fig. 2, in the step S1, the casing is mounted on the rotating shaft of the rotating platform through the flexible auxiliary tool, and the X-ray source is mounted on the six-axis robot, so that the relative position between the X-ray source and the casing is adjusted as required.
In the step S2, the fixed case is stationary, i.e. the rotary platform is not rotated, the six-axis robot is operated to drive the X-ray source to adjust the position, the X-ray transilluminator is used to image the film, a rectangular plane coordinate system is established with the length direction of the film as the X-axis, the width direction as the Y-axis, and the midpoint of the film in the length direction as the origin, and then the plane coordinates (X 1 ，y 1 ) As shown in particular in fig. 3.
It can be understood that the step S3 is specifically:
a space rectangular coordinate system is established by taking the length direction of a film as an X axis, the width direction as a Y axis and the midpoint of the length direction of the film as an origin, wherein the Z axis is perpendicular to an XY plane, the Z axis direction can be consistent with the direction of an X-ray source, and particularly as shown in fig. 4, a fixed case is fixed, a six-axis robot is operated to enable the X-ray source to respectively image the film at two different positions parallel to the film plane, the moving distance of the X-ray source and the moving distance of a defect image in two times of film imaging are recorded, and the height position coordinate of the defect in the dimension perpendicular to the film projection plane is calculated by using a first parallax method model.
The first parallax method model is as follows:wherein Z represents the height position coordinate of the defect in the dimension perpendicular to the projection plane of the film, D represents the moving distance of the defect image in the two film images, S represents the moving distance of the X-ray source, and L represents the focal length of the X-ray source.
Specifically, as shown in FIG. 5, the moving distance S of the X-ray source and the moving distance D of the defect image in the two film images are recorded, and the method can be realized by using the principle of similar triangleWherein L is 1 Representing the vertical distance of the X-ray source from the defect, and thus can be obtained: />And L is 2 I.e. the height position coordinate Z of the defect in the dimension perpendicular to the film projection plane.
Alternatively, the X-ray source may be a vertical irradiation or an oblique irradiation, and may be selected as needed.
It will be appreciated that, as another alternative, in another embodiment of the present invention, the step S3 is specifically:
and (3) establishing a column coordinate system by using a rotating shaft of the rotating platform, horizontally transilluminating the casing by using a fixed X-ray source, rotating the casing, and calculating the spatial position coordinate of the defect in the column coordinate system by adopting a parallax method based on films imaged before and after the rotation of the casing, thereby obtaining the height position coordinate of the defect in the dimension vertical to the film projection surface.
Specifically, the column coordinate system (i.e., the polar coordinate system) is built by taking the rotation axis of the rotation platform as the origin, and the spatial position (ρ, θ) of the defect in the column coordinate system can be determined only by determining the polar axis position ρ and the polar angle θ of the defect in the polar coordinate system. And operating the six-axis robot to adjust the position of the X-ray source, enabling the X-ray source to carry out horizontal transillumination on the casing, and then rotating the rotating platform to enable the casing to rotate a certain angle, so that the space position of the defect in the cylindrical coordinate system can be calculated by adopting a parallax method. In the step S3, the space position coordinates of the defect in the cylindrical coordinate system are obtained by calculating based on the film before and after the rotation of the receiver by adopting a parallax method, so that the process of obtaining the height position coordinates of the defect in the dimension perpendicular to the projection plane of the film is specifically as follows:
the arc length of the moving track of the defect image in the two films before and after rotation, the rotation angle of the case, the focal length of the X-ray source and the distance from the film to the rotation shaft are obtained, and the polar diameter of the defect in the cylindrical coordinate system is obtained by calculation through a second parallax method model, so that the spatial position coordinate of the defect in the cylindrical coordinate system is obtained.
Wherein the second parallax method model is as follows:wherein R represents the polar diameter of the defect in a cylindrical coordinate system, θ represents the rotation angle of the case, L represents the focal length of the X-ray source, < >>The arc length of the moving track of the defect image in the two films before and after rotation is shown, and r is the distance from the film to the rotating shaft.
Specifically, as shown in fig. 6, the position of the P-point X-ray source,the arc length of the moving track of the defect image in the two films is represented, SS 'represents the moving distance of the defect image, theta' represents the rotating angle of the defect image in the polar coordinate system, and +.>The arc length of the actual moving track of the defect during the double exposure is represented, QQ' represents the actual moving distance of the defect during the double exposure, θ represents the rotation angle of the case, R represents the distance from the film to the rotation axis, R represents the polar diameter of the defect in the polar coordinate system, L 1 Representing the vertical distance of the X-ray source from the defect, L 2 Representing the vertical distance between the defect and the film, i.e. the height position coordinate Z of the defect in the dimension perpendicular to the projection plane of the film. Then based on the principle of similar triangles it is possible to obtain:
thereby can obtainWherein L, r, θ are known, < + >>The method can be obtained based on two films, so that the polar diameter R of the defect in the polar coordinate system, namely the polar axis position rho, can be calculated, and the polar angle is the rotation angle theta of the casing, so that the spatial position of the defect in the polar coordinate system can be determined. Therefore, the height position coordinate z=l of the defect in the dimension perpendicular to the film projection plane 2 ＝R-r。
It can be understood that in the step S4, the unique position of the defect in the projection plane dimension can be determined based on the planar coordinate of the defect, and the unique position of the defect in the depth dimension can be determined based on the height position coordinate of the defect, so that the unique position of the defect in the three-dimensional space in the receiver can be located, and the locating precision is high.
In addition, as shown in fig. 7, another embodiment of the present invention further provides a system for spatially locating a defect inside a casing, preferably using the method of the foregoing embodiment, where the system includes:
the plane coordinate analysis module is used for establishing a plane rectangular coordinate system by taking the length direction of the film as an X axis, the width direction as a Y axis and the midpoint of the length direction of the film as an origin after the machine case is mounted on the rotary platform and the machine case is fixed, and obtaining the plane coordinate of the defect on the dimension of the projection plane of the film after the film is imaged by utilizing the X-ray transilluminating machine case;
the height position coordinate analysis module is used for changing the relative positions between the X-ray source and the workpiece and respectively imaging films, so that after the relative displacement of the defect images in two films formed before and after the position change, the height position coordinate of the defect in the dimension vertical to the film projection surface is calculated by adopting a parallax method;
and the positioning analysis module is used for positioning the position of the defect in the casing based on the plane coordinates and the height position coordinates of the defect.
It can be understood that, in the spatial positioning system for the defects inside the casing of the embodiment, after the casing is mounted on the rotary platform, the planar coordinates of the defects on the projection plane dimension of the film are obtained by adopting an X-ray transilluminating mode, then the relative positions between the X-ray source and the workpiece are changed and film imaging is performed respectively, so that the relative displacement is generated between the defect images in two films formed before and after the position change, the height position coordinates of the defects on the dimension perpendicular to the projection plane of the film are calculated by utilizing a parallax method, and therefore, the positions of the defects inside the casing can be determined based on the planar coordinates and the height position coordinates of the defects, the whole positioning process is automatically performed without manual intervention, and the unique positions in the three-dimensional space can be positioned by adopting the projection planar coordinates and the height position coordinates, thereby realizing the accurate positioning of the defects inside the casing with high positioning precision and effectively reducing the repairing difficulty.
The height position coordinate analysis module establishes a space rectangular coordinate system by taking the length direction of the film as an X axis, the width direction as a Y axis and the midpoint of the length direction of the film as an origin, and after film imaging is respectively carried out at two different positions of a parallel film plane by utilizing an X-ray source while a fixed case is stationary, the moving distance of the X-ray source and the moving distance of a defect image in two film imaging are recorded, and the height position coordinate of the defect in the dimension vertical to the film projection plane is calculated by utilizing a first parallax method model. The first parallax method model is as follows:wherein Z represents the height position coordinate of the defect in the dimension perpendicular to the film projection plane, D represents the moving distance of the defect image in two film images, S represents the X-ray sourceThe distance of movement, L, represents the focal length of the X-ray source.
And the height position coordinate analysis module builds a column coordinate system by using a rotating shaft of the rotating platform, and after the fixed X-ray source carries out horizontal transillumination on the casing and rotates the casing, the parallax method is adopted to calculate and obtain the space position coordinate of the defect in the column coordinate system based on films imaged before and after the rotation of the casing, so as to obtain the height position coordinate of the defect in the dimension vertical to the film projection surface.
The process for obtaining the height position coordinates of the defects on the dimension perpendicular to the projection plane of the film by calculating the space position coordinates of the defects in a cylindrical coordinate system based on the film before and after the rotation of the case by adopting a parallax method specifically comprises the following steps:
the arc length of the moving track of the defect image in the two films before and after rotation, the rotation angle of the case, the focal length of the X-ray source and the distance from the film to the rotation shaft are obtained, and the polar diameter of the defect in the cylindrical coordinate system is obtained by calculation through a second parallax method model, so that the spatial position coordinate of the defect in the cylindrical coordinate system is obtained.
Wherein the second parallax method model is as follows:wherein R represents the polar diameter of the defect in a cylindrical coordinate system, θ represents the rotation angle of the case, L represents the focal length of the X-ray source, < >>The arc length of the moving track of the defect image in the two films before and after rotation is shown, and r is the distance from the film to the rotating shaft.
It can be understood that each module in the embodiment of the present system corresponds to each step in the embodiment of the method, so that specific working processes and working principles of each module are not described herein, and reference is made to the embodiment of the method.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The space positioning method for the internal defects of the casing is characterized by comprising the following steps:
mounting the casing on a rotary platform;
the method comprises the steps of fixing a case, performing film imaging by using an X-ray transilluminator, establishing a plane rectangular coordinate system by taking the length direction of a film as an X axis, the width direction as a Y axis and the midpoint of the length direction of the film as an origin, and obtaining the plane coordinates of defects on the dimension of a film projection surface;
changing the relative position between the X-ray source and the workpiece, and respectively performing film imaging to enable the defect images in two films formed before and after the position change to generate relative displacement, and calculating to obtain the height position coordinates of the defects in the dimension vertical to the film projection surface by adopting a parallax method;
positioning the position of the defect in the casing based on the plane coordinates and the height position coordinates of the defect;
the process of changing the relative position between the X-ray source and the workpiece and respectively imaging films to enable the defect images in two films formed before and after the position change to generate relative displacement and calculating the height position coordinates of the defects on the dimension vertical to the film projection surface by adopting a parallax method comprises the following specific steps:
establishing a column coordinate system by using a rotating shaft of a rotating platform, horizontally transilluminating a casing by using a fixed X-ray source, rotating the casing, and calculating to obtain a spatial position coordinate of the defect in the column coordinate system by adopting a parallax method based on films imaged before and after the rotation of the casing, thereby obtaining a height position coordinate of the defect in a dimension vertical to a film projection surface;
the process for obtaining the height position coordinates of the defects on the dimension perpendicular to the projection plane of the film by calculating the space position coordinates of the defects in a cylindrical coordinate system based on the film imaged before and after the rotation of the case by adopting a parallax method specifically comprises the following steps:
acquiring arc length of a moving track of a defect image in two films before and after rotation of the case, rotation angle of the case, focal length of an X-ray source and distance from the film to a rotation shaft, and calculating to obtain polar diameter of the defect in a cylindrical coordinate system by adopting a second parallax method model so as to obtain spatial position coordinates of the defect in the cylindrical coordinate system;
wherein,the second parallax method model is as follows: />R represents the polar diameter of the defect in a cylindrical coordinate system, θ represents the rotation angle of the case, L represents the focal length of the X-ray source, +.>The arc length of the moving track of the defect image in the two films before and after rotation is represented, r represents the distance from the film to the rotating shaft, L 1 Representing the vertical distance of the X-ray source from the defect, L 2 Represents the vertical distance between the defect and the film, QQ 'represents the actual moving distance of the defect at two exposures, SS' represents the moving distance of the defect image, +.>The arc length of the actual moving track of the defect during the two exposures is shown, and the theta' represents the rotation angle of the defect image under the polar coordinate system.
2. A spatial localization system for internal defects of a casing, comprising:
the plane coordinate analysis module is used for establishing a plane rectangular coordinate system by taking the length direction of the film as an X axis, the width direction as a Y axis and the midpoint of the length direction of the film as an origin after the machine case is mounted on the rotary platform and the machine case is fixed, and obtaining the plane coordinate of the defect on the dimension of the projection plane of the film after the film is imaged by utilizing the X-ray transilluminating machine case;
the height position coordinate analysis module is used for changing the relative positions between the X-ray source and the workpiece and respectively imaging films, so that after the relative displacement of the defect images in two films formed before and after the position change, the height position coordinate of the defect in the dimension vertical to the film projection surface is calculated by adopting a parallax method;
the positioning analysis module is used for positioning the position of the defect in the casing based on the plane coordinates and the height position coordinates of the defect;
the height position coordinate analysis module builds a column coordinate system by using a rotating shaft of the rotating platform, and after the fixed X-ray source carries out horizontal transillumination on the casing and rotates the casing, a parallax method is adopted to calculate and obtain the space position coordinate of the defect in the column coordinate system based on films imaged before and after the rotation of the casing, so as to obtain the height position coordinate of the defect in the dimension vertical to the film projection surface;
the process for obtaining the height position coordinate of the defect on the dimension perpendicular to the projection plane of the film by calculating the space position coordinate of the defect in a cylindrical coordinate system based on the film imaged before and after the rotation of the case by adopting a parallax method comprises the following steps:
acquiring arc length of a moving track of a defect image in two films before and after rotation of the case, rotation angle of the case, focal length of an X-ray source and distance from the film to a rotation shaft, and calculating to obtain polar diameter of the defect in a cylindrical coordinate system by adopting a second parallax method model so as to obtain spatial position coordinates of the defect in the cylindrical coordinate system;
wherein,the second parallax method model is as follows: />R represents the polar diameter of the defect in a cylindrical coordinate system, θ represents the rotation angle of the case, L represents the focal length of the X-ray source, +.>The arc length of the moving track of the defect image in the two films before and after rotation is represented, r represents the distance from the film to the rotating shaft, L 1 Representing the vertical distance of the X-ray source from the defect, L 2 Represents the vertical distance between the defect and the film, QQ 'represents the actual moving distance of the defect at two exposures, SS' represents the moving distance of the defect image, +.>The arc length of the actual moving track of the defect during the two exposures is shown, and the theta' represents the rotation angle of the defect image under the polar coordinate system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111521624.4A CN114199905B (en) | 2021-12-13 | 2021-12-13 | Space positioning method and system for internal defects of casing |
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