An X-ray-based system for detecting spherical objects

Abstract

This invention discloses an X-ray-based system for detecting spherical shell-shaped objects. The system includes a main frame housing a C-arm, a flat panel detector, a flat panel detector position adjustment mechanism, an arc-shaped detector, an X-ray source, a X-ray source position adjustment mechanism, and a sample stage. The C-arm is fixed to the top of the main frame. The spherical shell-shaped object to be detected is placed on the sample stage, with its center located at the center O of the circle corresponding to the C-arm. The flat panel detector position adjustment mechanism adjusts the position of the flat panel detector on the C-arm, ensuring that the vertical line from the center of the flat panel detector always intersects the center O. The center of the arc-shaped detector coincides with the center O. The X-ray source scans the region of interest of the spherical shell-shaped object. The X-ray source position adjustment mechanism adjusts the position of the X-ray source. This invention is suitable for detecting spherical shell-shaped objects, and the DR imaging is distortion-free.

Description

Technical Field

[0001] This utility model belongs to the field of X-ray nondestructive testing and relates to an X-ray-based detection system for spherical shell objects, used for auxiliary identification, location, measurement, and detection of material density uniformity of spherical shell objects. Background Technology

[0002] Currently, X-ray computed tomography (CT) is an effective non-destructive testing method for detecting the three-dimensional information of the internal structure of objects, and it has wide applications in industry, medical diagnostics, and other fields. The objects scanned are of similar scale in three dimensions. However, CT technology does not produce satisfactory imaging results for plate-shaped components such as multilayer printed circuit boards, sheet-like fossils, aircraft wings, and solar panels. In recent years, research and development of X-ray computed tomography (CL) has been remarkable. This technology scans flat objects and is not suitable for curved samples.

[0003] In the current computer-aided layered scanning imaging (CL) scheme, the X-ray source is located below the equipment, and the stage is above the X-ray source, which moves the flat sample to be tested horizontally in space. A fixed frame is set above the stage, and the fixed frame is connected to a rotating arm. The rotating arm can rotate in a circular motion, and a flat plate detector is set on the rotating arm. The detector can slide along the arc-shaped guide rail on the rotating arm, and can scan and image the flat plate at various specific positions according to specific needs.

[0004] As can be seen from the above, current technologies primarily use linear array detectors or area array detectors. Digital radiography (DR) of spherical objects suffers from severe image distortion due to inconsistent magnification ratios. Utility Model Content

[0005] To address the problems existing in the prior art, the purpose of this utility model is to provide an X-ray-based detection system for spherical shell-shaped objects. This solution combines an arc-shaped detector (detection units arranged in an arc) with a flat panel detector to solve the above problems. The device can achieve the following functions: (1) overall DR imaging; (2) local DR imaging; (3) local CL imaging.

[0006] The key point of this utility model is:

[0007] 1) The equipment detector is fixed on the C-shaped arm, which is simultaneously equipped with an arc-shaped linear array detector and a flat panel detector. The flat panel detector can move along the C-shaped arm to adjust its angle and position.

[0008] 2) The X-ray source can move in multiple dimensions. It can move up and down along a straight track, move horizontally along a straight track, rotate along the center of the electric turntable, and swing along an arc track.

[0009] 3) Equipment functions: The equipment can perform overall DR imaging, partial DR images, and partial CL imaging.

[0010] The technical solution of this utility model is as follows:

[0011] An X-ray-based spherical shell object detection system, characterized in that it includes a main frame 1, wherein the main frame 1 is provided with a C-shaped arm 2, a flat panel detector 3, a flat panel detector position adjustment mechanism 4, an arc-shaped detector 5, an X-ray source 6, a X-ray source position adjustment mechanism 7, and a sample stage 8.

[0012] The C-shaped arm 2 is fixed to the top of the main frame 1;

[0013] The sample stage 8 is located in the middle of the main frame 1 and is used to place the spherical object 9 to be tested and to drive the spherical object 9 to rotate. The center of the spherical object 9 is located on the center O of the circle corresponding to the C-shaped arm 2.

[0014] The flat panel detector 3 is mounted on one side of the C-shaped arm 2 via the flat panel detector position adjustment mechanism 4, and is used to receive X-rays; the flat panel detector position adjustment mechanism 4 is used to adjust the position of the flat panel detector 3 on the C-shaped arm 2, and during the movement of the flat panel detector 3 on the C-shaped arm 2, the central vertical line of the flat panel detector 3 always intersects with the center O of the circle.

[0015] The arc-shaped detector 5 is mounted and fixed on the other side of the C-shaped arm 2 for receiving X-rays; the center of the arc-shaped detector 5 coincides with the center O.

[0016] The X-ray source 6 is mounted on the X-ray source position adjustment mechanism 7 and is located below the spherical shell object 9. It is used to generate X-rays to scan the region of interest of the spherical shell object 9.

[0017] The X-ray source position adjustment mechanism 7 is located at the bottom of the main frame 1 and is used to adjust the position of the X-ray source 6.

[0018] Furthermore, the sample stage 8 includes a marble platform 10, and the center of the marble platform 10 is provided with a hollow turntable 11 for rotating the spherical object 9; the hollow turntable 11 is provided with an adjustable bracket 12 for supporting the spherical object 9 and adjusting the position of the spherical object 9 so that its center is located on the center O.

[0019] Furthermore, the X-ray source position adjustment mechanism 7 includes a lifting mechanism 15, a linear module 16, an electric turntable 17, an arc-shaped track 18, a mechanism base 19, and a lower arc-shaped drive mechanism 20; the mechanism base 19 is fixed on the main frame 1, the arc-shaped track 18 is mounted on the mechanism base 19, and the lower arc-shaped drive mechanism 20 is mounted on the arc-shaped track 18; the electric turntable 17 is mounted on the lower arc-shaped drive mechanism 20; the lower arc-shaped drive mechanism 20 is used to drive the electric turntable 17 to swing around the center O on the arc-shaped track 18; the electric turntable 17 is provided with the linear module 16 for rotating the linear module 16; the linear module 16 is provided with the lifting mechanism 15 for controlling the movement of the lifting mechanism 15 in the horizontal plane; the X-ray source 6 is mounted on the lifting mechanism 15 for controlling the lifting and lowering of the X-ray source 6.

[0020] Furthermore, the center of the arc-shaped track 18 coincides with the center O.

[0021] Furthermore, the central angle of the arc-shaped detector 5 is not less than 90 degrees.

[0022] Furthermore, the outer side of the main frame 1 is provided with a shielding structure.

[0023] The advantages of this utility model are as follows:

[0024] 1) This scheme uses an arc-shaped detector, and there is no distortion in DR imaging for spherical objects.

[0025] 2) The structure of this scheme is suitable for spherical shell-shaped objects and can be used for local CL tomography. Attached Figure Description

[0026] Figure 1 This is a structural diagram of an X-ray-based spherical object detection device.

[0027] Figure 2 This is a schematic diagram of the sample stage structure.

[0028] Figure 3 This is a schematic diagram of the X-ray source and its position adjustment mechanism.

[0029] Figure 4 This is a flowchart of the overall DR imaging process.

[0030] Figure 5 This is a two-dimensional global projection diagram.

[0031] Figure 6 For intuitive DR diagrams.

[0032] Reference numerals: 1-Main frame, 2-C-shaped arm, 3-Flat panel detector, 4-Flat panel detector position adjustment mechanism, 5-Arc-shaped detector, 6-X-ray source, 7-X-ray source position adjustment mechanism, 8-Sample stage, 9-Spherical object, 10-Marble platform, 11-Hollow turntable, 12-Adjustable bracket, 15-Lifting mechanism, 16-Linear module, 17-Electric turntable, 18-Arc-shaped track, 19-Mechanism base, 20-Lower arc-shaped drive mechanism. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0034] like Figure 1 As shown, the X-ray-based spherical shell object detection system of this utility model mainly includes: a main frame 1, a C-shaped arm 2, a flat panel detector 3, a flat panel detector position adjustment mechanism 4, an arc detector 5, an X-ray source 6, a X-ray source position adjustment mechanism 7, a sample stage 8, and a spherical shell object to be detected 9.

[0035] The main frame 1 includes a frame section and an outer shielding structure. The frame section provides the foundation for the overall structure, while the shielding section is wrapped around the outside of the frame for radiation safety protection.

[0036] C-shaped arm 2 is fixed above the main frame 1. Flat panel detector 3 and arc detector 5 are used to receive X-rays and are respectively installed on both sides of C-shaped arm 2. Flat panel detector 3 can move on C-shaped arm 2 through flat panel detector position adjustment mechanism 4. During the movement, the central vertical line of flat panel detector 3 always intersects at point O. Arc detector 5 is fixed on C-shaped arm 2 and its position is stationary. The center of its arc is the aforementioned point O, and the central angle is not less than 90 degrees.

[0037] like Figure 3 As shown, the X-ray source 6 is used to generate X-rays and is installed on the X-ray source position adjustment mechanism 7. The X-ray source position adjustment mechanism 7 includes: a lifting mechanism 15, which is driven by a ball screw by a motor and uses a slider guide rail as a track to control the lifting and lowering of the X-ray source 6; a linear module 16, which moves the X-ray source 6 and the lifting mechanism 15 a certain distance along the track direction; an electric turntable 17, which drives the upper mechanism to rotate around the center of the turntable; a lower arc-shaped drive mechanism 20, which provides power for the entire mechanism including the electric turntable 17 to swing along the arc-shaped track 18, with the arc-shaped track 18 centered at the aforementioned point O; and a mechanism base 19, which provides support for the adjustment mechanism and is fixed to the main frame 1.

[0038] like Figure 2As shown, the sample stage 8 is used to place the spherical object 9, including: a marble platform 10 to ensure the flatness of the surface to be tested; a hollow turntable 11 to drive the spherical object 9 to rotate, which can rotate 360 ​​degrees; and an adjustable bracket 12 to support the spherical object 9 and ensure that the center of the spherical object 9 is located at the above-mentioned point O.

[0039] The job execution is described as follows:

[0040] 1) Overall DR imaging: Its workflow is as follows Figure 4 As shown.

[0041] Two-dimensional global projection diagram as follows Figure 5 As shown, α∈[0,2π] represents the sample rotation angle, and β∈[0,π / 2] represents the angle between the ray corresponding to the projection data and the horizontal plane. The black dot represents the position of the projection corresponding to point P on the sample, with coordinates (α1,β1).

[0042] To visually demonstrate the distribution of defects on the hemispherical sample, we define a new coordinate system, and the image generated based on this coordinate system is a visual projection. The origin of this coordinate system corresponds to the vertex of the hemisphere. Figure 5 The coordinates of point P mapped to the intuitive projection are (x1, y1), and the mapping relationship is as follows:

[0043]

[0044] like Figure 6 As shown, the location of sample defects can be easily located based on the intuitive projection diagram.

[0045] After performing overall DR imaging, the location of large-sized defects can be initially determined as the region of interest based on the intuitive DR image. To achieve higher resolution imaging of the defects, local high-resolution DR imaging can be used.

[0046] 2) Local DR Imaging: Based on the selected region of interest (ROI) location of the spherical object 9 to be detected, rotate the hollow turntable 11 to align the center of the ROI with the direction of the flat panel detector 3. Adjust the position of the flat panel detector 3 so that its center is close to the center of the ROI. Adjust the position of the X-ray source 6 so that the line connecting its focal point and the center of the flat panel detector 3 passes near the center of the ROI. Adjust the height of the X-ray source 6 to a suitable magnification ratio. The X-ray source 6 emits X-rays, and the flat panel detector 3 acquires data to obtain a local high-resolution DR image.

[0047] 3) Local CL Imaging: The preparation process is similar to that of local high-resolution DR imaging. The scanning radius of the X-ray source 6 focal spot is set, assuming to be r. The X-ray source 6 is moved a distance r by the linear module 16. During scanning, the motorized turntable 17 rotates the X-ray source 6 around the radius r, while the flat panel detector 3 acquires projection data. After acquiring 360 degrees of projection data, a three-dimensional tomographic image of the region of interest is obtained using the CL reconstruction algorithm. Based on this three-dimensional tomographic image, the three-dimensional location of the defect on the spherical shell can be analyzed.

[0048] Although specific embodiments of the present invention have been disclosed for illustrative purposes to aid in understanding and implementing the invention, those skilled in the art will understand that various substitutions, variations, and modifications are possible without departing from the spirit and scope of the invention and the appended claims. Therefore, the invention should not be limited to the content disclosed in the preferred embodiments, and the scope of protection claimed by the invention is defined by the claims.

Claims

1. A spherical shell-shaped object detection system based on X-rays, characterized in that, It includes a main frame (1), and the main frame (1) is provided with a C-shaped arm (2), a flat panel detector (3), a flat panel detector position adjustment mechanism (4), an arc detector (5), an X-ray source (6), a X-ray source position adjustment mechanism (7), and a sample stage (8); The C-shaped arm (2) is fixed to the top of the main frame (1); The sample stage (8) is located in the middle of the main frame (1) and is used to place the spherical object (9) to be tested and to drive the spherical object (9) to rotate. The center of the spherical object (9) is located on the center O of the circle corresponding to the C-shaped arm (2). The flat panel detector (3) is mounted on one side of the C-shaped arm (2) via the flat panel detector position adjustment mechanism (4) for receiving X-rays; the flat panel detector position adjustment mechanism (4) is used to adjust the position of the flat panel detector (3) on the C-shaped arm (2), and during the movement of the flat panel detector (3) on the C-shaped arm (2), the central vertical line of the flat panel detector (3) always intersects with the center O; The arc-shaped detector (5) is mounted and fixed on the other side of the C-shaped arm (2) for receiving X-rays; the center of the arc-shaped detector (5) coincides with the center O. The X-ray source (6) is mounted on the X-ray source position adjustment mechanism (7) and located below the spherical shell object (9) to generate X-rays and scan the region of interest of the spherical shell object (9); The X-ray source position adjustment mechanism (7) is located at the bottom of the main frame (1) and is used to adjust the position of the X-ray source (6).

2. The system according to claim 1, characterized in that, The sample stage (8) includes a marble platform (10), and the center of the marble platform (10) is provided with a hollow turntable (11) for rotating the spherical object (9); the hollow turntable (11) is provided with an adjustable bracket (12) for supporting the spherical object (9) and adjusting the position of the spherical object (9) so that its center is located on the center O.

3. The system according to claim 1, characterized in that, The X-ray source position adjustment mechanism (7) includes a lifting mechanism (15), a linear module (16), an electric turntable (17), an arc track (18), a mechanism base (19), and a lower arc drive mechanism (20); The mechanism base (19) is fixed on the main frame (1), the arc track (18) is installed on the mechanism base (19), the lower arc drive mechanism (20) is installed on the arc track (18), and the electric turntable (17) is installed on the lower arc drive mechanism (20). The lower arc-shaped drive mechanism (20) is used to drive the electric turntable (17) to swing around the center O on the arc-shaped track (18); The electric turntable (17) is equipped with the linear module (16) for rotating the linear module (16); The linear module (16) is provided with the lifting mechanism (15) for controlling the lifting mechanism (15) to move in the horizontal plane; The X-ray source (6) is installed on the control lifting mechanism (15) for controlling the lifting of the X-ray source (6).

4. The system according to claim 3, characterized in that, The center of the arc track (18) coincides with the center O.

5. The system according to claim 1, characterized in that, The central angle of the arc-shaped detector (5) is not less than 90 degrees.

6. The system according to claim 1, characterized in that, The outer side of the main frame (1) is provided with a shielding structure.

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