A line structured light 3D reconstruction platform for pulsed eddy current thermal imaging detection

Abstract

This utility model belongs to the field of optical scene 3D reconstruction technology, and is a line structured light 3D reconstruction platform for pulsed eddy current thermal imaging detection. It includes an overall frame, comprising a first platform base, a second platform base, a first vertical support adjustment unit, a motor positioning unit, a stepper motor, a second vertical support adjustment unit, and a translation guide mechanism. The translation guide mechanism includes a first translation guide rail, a second translation guide rail, a third translation guide rail, a fourth translation guide rail, a lead screw drive component, and a coupling. The lead screw drive component is connected to the coupling. A mounting support plate is jointly provided on the first, second, third, and fourth translation guide rails. An image acquisition unit is located directly above the second platform base on the mounting support plate. A platform control unit is jointly connected to the image acquisition unit and the stepper motor, thereby realizing the determination of the relative position between the excitation coil and the specimen in eddy current pulsed thermal imaging detection.

Description

Technical Field

[0001] This utility model relates to the field of optical scene three-dimensional reconstruction technology, specifically a line structured light three-dimensional reconstruction platform for pulsed eddy current thermal imaging detection. Background Technology

[0002] Eddy current pulsed thermal imaging (EDM) is a novel nondestructive testing (NDT) technology that combines the advantages of eddy current testing and infrared thermal imaging. It innovatively enables the detection of surface and subsurface defects in test specimens and provides rich visual information with the assistance of infrared thermal imaging. EDM uses an excitation coil to electromagnetically excite a conductor specimen, generating high heat at defects within the specimen. An infrared camera records the thermal response of the excitation process, allowing analysis of defect information and reconstruction of the defect morphology. During the testing process, the relative position between the coil and the specimen is crucial, directly affecting the electromagnetic coupling and thus the test results. The line-structured light 3D reconstruction system used in eddy current pulsed thermal imaging primarily reconstructs the surface point cloud of the coil and the test specimen, thereby determining their relative position and facilitating the creation of digital twins for eddy current pulsed thermal imaging.

[0003] The principle of line structured light 3D reconstruction is based on triangulation. It projects line laser stripes onto the object's surface, and then a camera records the shape changes of the line laser stripes to obtain the object's surface information. It has the characteristics of strong anti-interference ability, fast scanning speed, and high accuracy, and can obtain high-precision and high-density point clouds of object surfaces. Compared with other structured light 3D reconstruction systems such as surface structured light, the structure light source of the line structured light 3D reconstruction system can be an ordinary line laser emitter, which is more cost-effective and does not affect the reconstruction accuracy. With the continuous development of line structured light technology, it has been widely used in industrial inspection, machine vision and other fields. However, line structured light technology still has obvious defects in some application scenarios. For example, when the surface of the object being inspected has strong reflection, it is difficult to obtain accurate and clear line laser stripes, which affects the reconstruction accuracy.

[0004] Therefore, there is an urgent need for a line structured light 3D reconstruction platform for pulsed eddy current thermal imaging detection to determine the relative position between the excitation coil and the specimen in eddy current pulsed thermal imaging detection. Utility Model Content

[0005] The present invention aims to solve the above problems, thereby providing a line structured light three-dimensional reconstruction platform for pulsed eddy current thermal imaging detection, and thus realizing the determination of the relative position between the excitation coil and the specimen in eddy current pulsed thermal imaging detection.

[0006] The technical solution adopted by this utility model to solve the aforementioned problem is: A line structured light 3D reconstruction platform for pulsed eddy current thermal imaging detection includes an overall frame. The overall frame includes a first platform base and a second platform base connected to each other. A first vertical support adjustment part is vertically arranged on the first platform base, and a motor positioning part is arranged on the first vertical support adjustment part. A stepper motor is arranged on the motor positioning part. A second vertical support adjustment part is vertically arranged on the second platform base, and a translation guide mechanism connected to the stepper motor is arranged on the second vertical support adjustment part. The translation guide mechanism includes parallel components... The system comprises a first translation guide rail, a second translation guide rail, a third translation guide rail, and a fourth translation guide rail. A lead screw drive component is installed between the second and third translation guide rails. A coupling is connected to the output end of the stepper motor, and the lead screw drive component is connected to the coupling. A mounting support plate is installed on the first, second, third, and fourth translation guide rails. An image acquisition unit is installed on the mounting support plate, located directly above the second platform base. A platform control unit located outside the overall frame is connected to the image acquisition unit and the stepper motor.

[0007] As a preferred embodiment, a further technical solution of this utility model is as follows: Preferably, the first vertical support adjustment part includes two vertical columns, which are parallel to each other and vertically fixed on the first platform base. The motor positioning part is slidably installed on the two vertical columns, and the motor positioning part drives the stepper motor to move up and down along the height direction of the two vertical columns.

[0008] Preferably, the second vertical support adjustment part includes two vertical connecting columns, which are parallel to each other and vertically fixed on the second platform base. A connecting beam is connected between the upper ends of the two vertical connecting columns.

[0009] Preferably, the first translation guide rail, the second translation guide rail, the third translation guide rail, and the fourth translation guide rail are slidably mounted on the two vertical connecting columns. The first translation guide rail, the second translation guide rail, the third translation guide rail, and the fourth translation guide rail together drive the mounting support plate, the screw transmission component, and the coupling to move up and down along the height direction of the two vertical connecting columns.

[0010] Preferably, the stepper motor, the lead screw drive component, and the coupling move up and down synchronously along the height direction of the vertical column and the vertical connecting column.

[0011] Preferably, the image acquisition unit includes a camera and a line laser source, and a camera mounting part and a line laser source mounting part are provided on the mounting support plate, with the camera and line laser source respectively mounted on the camera mounting part and the line laser source mounting part.

[0012] Preferably, both the camera and the line laser source are connected to the platform control unit.

[0013] Preferably, the mounting support plate is threadedly connected to the lead screw drive component, and the mounting support plate is slidably mounted on the first translation guide rail, the second translation guide rail, the third translation guide rail, and the fourth translation guide rail. The stepper motor, the coupling, and the lead screw drive component together drive the mounting support plate to reciprocate left and right along the length direction of the first translation guide rail, the second translation guide rail, the third translation guide rail, and the fourth translation guide rail.

[0014] Preferably, the bottoms of the first platform base and the second platform base are at the same horizontal height.

[0015] Compared with the prior art, the outstanding features of this utility model, which adopts the above technical solution, are: This invention employs a vertical support adjustment unit, allowing for flexible height adjustment based on actual application scenarios. This facilitates the subsequent processing of reflected light spots in structured light images by the platform control unit, thereby achieving precise reconstruction of the excitation coil and specimen surface. The vertical support adjustment units are uniformly fixed to the platform base, ensuring consistent reference and adjustment accuracy. The connecting beam on the first vertical support adjustment unit ensures parallelism between the units, further guaranteeing parallelism between the guide rails in the translation guide mechanism, enabling the mounting support plate to operate smoothly on the translation guide mechanism. The platform control unit's automated control of the stepper motor, camera, and line laser source efficiently acquires and processes images according to a preset route, outputting the reconstructed point cloud of the excitation coil and specimen in real time. The reconstructed point cloud of the excitation coil and specimen allows for the determination of their relative positions, enabling the establishment of simulation data. This data is then compared with experimental data from pulsed eddy current thermal imaging detection, which is crucial for evaluating the results of pulsed eddy current thermal imaging detection. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main view structure of an embodiment of this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the main view structure of an embodiment of this utility model. Figure 2 ; In the diagram: 100, Overall frame; 200, Image acquisition unit; 10, First translation guide rail; 11, Second translation guide rail; 12, Third translation guide rail; 13, Fourth translation guide rail; 20, Motor positioning unit; 30, First vertical column; 31, Second vertical column; 32, First vertical connecting column; 33, Second vertical connecting column; 34, Connecting beam; 35, Second platform base; 36, First platform base; 40, Stepper motor; 41, Coupling; 50, Mounting support plate; 60, Camera mounting unit; 70, Line laser source mounting unit; 80, Screw drive component. Detailed Implementation

[0017] The following description of the embodiments will help the public better understand the present invention. However, the specific embodiments provided by the applicant should not and should not be regarded as a limitation on the technical solution of the present invention. Any changes to the definition of components or technical features and / or formal but not substantive changes to the overall structure should be regarded as the scope of protection defined by the technical solution of the present invention.

[0018] See Figures 1 to 2 As shown, the technical solution of this utility model is as follows: A line structured light 3D reconstruction platform for pulsed eddy current thermal imaging detection includes an overall frame 100. The overall frame 100 includes a first platform base 36 and a second platform base 35. The bottoms of the first platform base 36 and the second platform base 35 are at the same horizontal height, and the right side of the first platform base 36 and the left side of the second platform base 35 are connected. A first vertical support adjustment part is vertically fixed on the first platform base 36. The first vertical support adjustment part includes a first vertical column 30 and a second vertical column 31, which are arranged parallel to each other. Both the first vertical column 30 and the second vertical column 31 are vertically fixed on the first platform base 36. A motor positioning part 20 is slidably installed between the first vertical column 30 and the second vertical column 31. A stepper is installed on the motor positioning part 20. The stepper motor 40 and the motor positioning part 20 drive the stepper motor 40 to move up and down along the height direction of the first vertical column 30 and the second vertical column 31. A second vertical support adjustment part is vertically fixed on the second platform base 35. The second vertical support adjustment part includes a first vertical connecting column 32 and a second vertical connecting column 33. The first vertical connecting column 32 and the second vertical connecting column 33 are arranged parallel to each other. The first vertical connecting column 32 and the second vertical connecting column 33 are both vertically fixed on the second platform base 35. A connecting beam 34 is connected between the upper ends of the first vertical connecting column 32 and the second vertical connecting column 33. The parallelism of the first vertical connecting column 32 and the second vertical connecting column 33 is ensured by the connecting beam 34. A translation guide mechanism is provided on the second vertical support adjustment part. The translation guide mechanism is connected to the stepper motor 40. The translation guide mechanism includes a first translation guide 10, a second translation guide 11, a third translation guide 12, and a fourth translation guide 13. These four guides are spaced apart from each other from top to bottom and are parallel to one another. A lead screw drive component 80 is provided between the second and third translation guides 11 and 12. A coupling 41 is connected to the output end of the stepper motor 40. The lead screw drive component 80 and the coupling 41... 1. Connected together, the first translation guide rail 10, the second translation guide rail 11, the third translation guide rail 12, and the fourth translation guide rail 13 are slidably mounted on the first vertical connecting column 32 and the second vertical connecting column 33. A mounting support plate 50 is provided on the first translation guide rail 10, the second translation guide rail 11, the third translation guide rail 12, and the fourth translation guide rail 13. The first translation guide rail 10, the second translation guide rail 11, the third translation guide rail 12, and the fourth translation guide rail 13 together drive the mounting support plate 50. 0. The lead screw drive component 80 and the coupling 41 move up and down along the height direction of the first vertical connecting column 32 and the second vertical connecting column 33. The stepper motor 40, the lead screw drive component 80 and the coupling 41 move up and down synchronously along the height direction of the first vertical column 30 and the first vertical connecting column 32. An image acquisition unit 200 is provided on the mounting support plate 50. A camera mounting unit 60 and a line laser source mounting unit 70 are provided on the mounting support plate 50. The image acquisition unit 200 includes a camera and a line laser source. The camera and the line laser source are correspondingly mounted on the camera mounting unit 60 and the line laser source mounting unit 70, and the camera and the line laser source are located directly above the second platform base 35. A platform control unit is connected to the camera, the line laser source and the stepper motor 40. The platform control unit is not shown in the platform control diagram. The platform control unit is located outside the overall frame 100. The platform control unit controls the stepper motor 40, the camera and the line laser source, and thus controls the horizontal movement of the mounting support plate 50 and image acquisition. The mounting support plate 50 is threadedly connected to the lead screw drive component 80, and the mounting support plate 50 is slidably mounted on the first translation guide rail 10, the second translation guide rail 11, the third translation guide rail 12, and the fourth translation guide rail 13. The stepper motor 40, the coupling 41, and the lead screw drive component 80 jointly drive the mounting support plate 50 to reciprocate left and right along the length direction of the first translation guide rail 10, the second translation guide rail 11, the third translation guide rail 12, and the fourth translation guide rail 13. The vertical height of the image acquisition unit 200 is adjusted by the first vertical support adjustment part, and the vertical height of the stepper motor 40 is adjusted by the second vertical support adjustment part, thereby matching the height of the image acquisition unit 200 to meet different application scenarios.

[0019] The working principle is as follows: The first and second vertical support adjustment units adjust the height of the stepper motor 40, the translation guide rail mechanism, the mounting support plate 50, the camera, and the line laser source according to the actual scene, so that the height meets the requirements; the platform control unit controls the stepper motor 40 to drive the lead screw transmission component 80 to rotate, thereby driving the mounting support plate 50 to move horizontally in a preset direction and speed; when the mounting support plate 50 moves horizontally, the platform control unit controls the line laser source on the mounting support plate 50 to project specific line structured light onto the excitation coil and the specimen below; at the same time, it controls the camera on the mounting support plate 50 to acquire the structured light image; the platform control unit processes the acquired structured light image to realize the surface reconstruction of the excitation coil and the specimen below, and uses this to determine the relative position of the excitation coil and the specimen.

[0020] This invention employs a vertical support adjustment unit, which allows for flexible height adjustment according to actual application scenarios. This facilitates the subsequent processing of reflected light spots in structured light images by the platform control unit, thereby achieving accurate reconstruction of the excitation coil and the specimen surface. The vertical support adjustment units are uniformly fixed on the platform base, ensuring uniformity of the reference and accuracy of the adjustment. The connecting beam 34 on the first vertical support adjustment unit ensures the parallelism between the first vertical support adjustment units, further guaranteeing the parallelism between the various guide rails in the translation guide rail mechanism, enabling the mounting support plate 50 to operate smoothly on the translation guide rail mechanism. The platform control unit's automated control of the stepper motor 40, camera, and line laser source can efficiently acquire and process images according to a preset route, outputting the reconstructed point cloud of the excitation coil and the specimen in real time. The reconstructed point cloud of the excitation coil and the specimen can determine the relative position between the excitation coil and the specimen, and use this to establish simulation data. This data can be compared with experimental data from pulsed eddy current thermal imaging detection, which is of great significance for evaluating the results of pulsed eddy current thermal imaging detection.

[0021] The above description is only a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent changes made based on the content of the present utility model specification and its drawings are included within the scope of the present utility model.

Claims

1. A line structured light three-dimensional reconstruction platform for pulsed eddy current thermal imaging detection, characterized in that: The system includes an overall frame comprising a first platform base and a second platform base connected to each other. A first vertical support adjustment section is vertically mounted on the first platform base, and a motor positioning section is mounted on the first vertical support adjustment section. A stepper motor is mounted on the motor positioning section. A second vertical support adjustment section is vertically mounted on the second platform base, and a translational guide mechanism connected to the stepper motor is mounted on the second vertical support adjustment section. The translational guide mechanism includes a first, second, third, and fourth translational guide rails arranged parallel to each other. A lead screw drive component is positioned between the second and third translational guide rails. A coupling is connected to the output end of the stepper motor, and the lead screw drive component is connected to the coupling. A mounting support plate is shared on the first, second, third, and fourth translational guide rails. An image acquisition unit located directly above the second platform base is mounted on the mounting support plate. A platform control unit located outside the overall frame is connected to both the image acquisition unit and the stepper motor.

2. The line structured light three-dimensional reconstruction platform for pulsed eddy current thermal imaging detection according to claim 1, characterized in that: The first vertical support adjustment unit includes two vertical columns, which are parallel to each other and vertically fixed on the first platform base. The motor positioning unit is slidably installed on the two vertical columns, and the motor positioning unit drives the stepper motor to move up and down along the height direction of the two vertical columns.

3. The line structured light three-dimensional reconstruction platform for pulsed eddy current thermal imaging detection according to claim 2, characterized in that: The second vertical support adjustment unit includes two vertical connecting columns, which are parallel to each other and vertically fixed on the second platform base. A connecting beam is connected between the upper ends of the two vertical connecting columns.

4. The line structured light three-dimensional reconstruction platform for pulsed eddy current thermal imaging detection according to claim 3, characterized in that: The first, second, third, and fourth translation guide rails are slidably mounted on two vertical connecting columns. Together, they drive the mounting support plate, the lead screw transmission component, and the coupling to move up and down along the height direction of the two vertical connecting columns.

5. The line structured light three-dimensional reconstruction platform for pulsed eddy current thermal imaging detection according to claim 4, characterized in that: The stepper motor, lead screw drive components, and coupling move synchronously up and down along the height direction of the vertical column and the vertical connecting column.

6. The line structured light three-dimensional reconstruction platform for pulsed eddy current thermal imaging detection according to claim 1, characterized in that: The image acquisition unit includes a camera and a line laser source. A camera mounting part and a line laser source mounting part are provided on the mounting support plate, and the camera and the line laser source are respectively mounted on the camera mounting part and the line laser source mounting part.

7. The line structured light three-dimensional reconstruction platform for pulsed eddy current thermal imaging detection according to claim 6, characterized in that: Both the camera and the line laser source are connected to the platform control unit.

8. The line structured light three-dimensional reconstruction platform for pulsed eddy current thermal imaging detection according to claim 1, characterized in that: The mounting support plate is threadedly connected to the lead screw drive component, and the mounting support plate is slidably mounted on the first translation guide rail, the second translation guide rail, the third translation guide rail, and the fourth translation guide rail. The stepper motor, coupling, and lead screw drive component together drive the mounting support plate to reciprocate left and right along the length direction of the first translation guide rail, the second translation guide rail, the third translation guide rail, and the fourth translation guide rail.

9. The line structured light three-dimensional reconstruction platform for pulsed eddy current thermal imaging detection according to claim 1, characterized in that: The bottoms of both the first and second platform bases are at the same horizontal level.

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