Calibration indicator for a laser profilometer and method of use thereof

Abstract

This invention provides a calibration indicator device for a laser profilometer and its usage method. The calibration indicator device includes multiple measuring plates capable of detecting the intensity of the light field center. The measuring plates are distributed around the outer side of the rail, and all measuring plates are fixed by positioning components. After being fully fixed, one coordinate axis of the absolute coordinate system set on each measuring plate is located on the same plane perpendicular to the straight line of the rail. When the profilometer emits a calibration light field onto the measuring plate, if the light field coincides with the coordinate axis, or the difference between the light field and the coordinate axis is equal, it can be determined that the light fields emitted by all the profilometers are coplanar. At this time, when the profilometer images obtained after scanning are stitched together to form the overall profilometer image, there will be no misalignment. Therefore, multiple laser profilometers can obtain the entire rail profilometer shape with only one calibration indication, which is highly efficient.

Description

Technical Field

[0001] This invention relates to the field of rail inspection technology, specifically to a calibration indicator device for a laser profilometer and its usage method. Background Technology

[0002] Rail inspection plays a crucial role in the railway industry. Maintaining good rail condition is essential for ensuring the comfort and safety of high-speed train operation. Current rail profile measurement methods fall into two main categories: one is contact measurement, also known as static inspection, where the inspection equipment remains relatively stationary with the rail. The other is non-contact measurement methods, such as non-contact electronic measurement, image processing measurement, and optical measurement. These methods do not involve direct contact with the rail, and their development relies on the rapid advancements in industrial automation technology in recent years.

[0003] Non-contact measurement is commonly used, primarily employing a laser profilometer to acquire geometric data of the rail cross-section. Driven by a scanning stage or under axial traction of the rail, the laser profilometer continuously collects geometric parameters of the rail cross-section, completing the measurement of the rail's profile. Current methods for measuring rails using laser profilometers generally rely on symmetrical two-sided calibration devices, making it difficult to perform a single calibration of the entire rail profile. Multiple calibrations are required, resulting in low efficiency in obtaining the complete rail profile.

[0004] Therefore, a new calibration indicator device for laser profilometers is needed to solve the problem that existing calibration indicator devices are difficult to calibrate the entire rail profile at once, requiring multiple calibrations and resulting in low efficiency. Summary of the Invention

[0005] This invention provides a calibration indicator device for a laser profiler and its usage method, which can solve the problem that existing calibration indicator devices are difficult to calibrate the entire rail profile at once, requiring multiple calibrations and resulting in low efficiency.

[0006] To solve the above problems, the technical solution provided by the present invention is as follows:

[0007] The present invention provides a calibration indicator device for a laser profilometer, wherein multiple laser profilometers are used to scan the overall profile of a rail, and the calibration indicator device includes multiple measuring plates and a positioning component for fixing the measuring plates;

[0008] Among them, multiple measuring plates are arranged around the outside of the rail, and the multiple measuring plates are used to calibrate the coplanarity of the light fields emitted by multiple laser profilometers;

[0009] The positioning component includes a frame and a stroke-readable cylinder. The frame is used to hold the measuring plate, and a connecting part is provided at the corner of the frame. The stroke-readable cylinder controls the frame to move along a direction perpendicular to the profile surface of the rail through the connecting part.

[0010] According to an optional embodiment of the present invention, the number of measuring plates is four, and the four measuring plates are respectively arranged at the top, bottom, left and right positions of the rail profile surface. The adjacent measuring plates are perpendicular to each other to form a rectangular frame that wraps around the cross-section of the rail.

[0011] According to an optional embodiment of the present invention, the frame is a two-layer quadrilateral frame, and the four measuring plates are respectively located on the four sides of the quadrilateral frame; wherein, the two layers of quadrilateral frames are connected through the two ends of the stroke-readable cylinder.

[0012] According to an optional embodiment of the present invention, the number of stroke-readable cylinders is four, and the two ends of the four stroke-readable cylinders are located at the four corners of the two layers of the quadrilateral frame.

[0013] According to an optional embodiment of the present invention, the stroke-readable cylinder is also electrically connected to a control comparison module, which is used to calculate the displacement change values ​​of each of the measuring plates.

[0014] According to an optional embodiment of the present invention, the measuring plate is a photoelectric detection plate; wherein, each measuring plate is provided with a virtual absolute coordinate system, and a preset coordinate axis is provided in the virtual absolute coordinate system.

[0015] According to an optional embodiment of the present invention, the frame is provided with a wedge on the inner wall corresponding to the measuring plate.

[0016] According to an optional embodiment of the present invention, the measuring plate is further provided with a limiting plate that matches the top contour of the rail.

[0017] According to the calibration indicator device for the laser profilometer in the above embodiments, the present invention also provides a method for using the calibration indicator device for the laser profilometer, the method comprising:

[0018] Step S10: Fix multiple measuring plates using positioning components, and arrange the multiple measuring plates around the outside of the rail to form a rectangular frame that wraps around the cross-section of the rail.

[0019] Step S20: A virtual absolute coordinate system is set on each of the measuring plates. A preset coordinate axis in the absolute coordinate system is located on the same plane perpendicular to the straight line of the rail in space, so as to determine that the preset coordinate axes corresponding to all measuring plates are coplanar.

[0020] In step S30, multiple laser profilometers project calibration light fields onto the measuring plate. If the calibration light field coincides with the preset coordinate axis, or the difference between the calibration light field and the preset coordinate axis is equal, it is determined that the light fields projected by all laser profilometers are coplanar. At this time, when the contour images obtained by multiple laser profilometers are stitched together to form an overall contour image, there will be no misalignment, thus obtaining a complete rail contour shape.

[0021] According to an optional embodiment of the present invention,

[0022] Step S20 specifically includes: the absolute coordinate system includes coordinate axis x31 and coordinate axis y32;

[0023] Once the measuring plates are fixed, if the coordinate axes x31 on each measuring plate are located on the same plane perpendicular to the straight line where the rail is located, and the coordinate axes y32 on each measuring plate are parallel to each other;

[0024] Step S30 specifically includes:

[0025] When the light field emitted by the laser profilometer illuminates the corresponding surface of the measuring plate, the measuring plate constructs a relative coordinate axis x41 based on the intensity position of the center of the light field;

[0026] When the calibration light field emitted by the laser profilometer onto the measuring plate coincides with coordinate axis x31, that is, it coincides with coordinate axis x31 relative to coordinate axis x41, at this time Δy is 0; then the light fields emitted by all laser profilometers are coplanar.

[0027] When the calibration light field emitted by the laser profilometer onto the measuring plate 1 does not coincide with the coordinate axis x31, it does not coincide with the coordinate axis x31 relative to the coordinate axis x41. At this time, Δy is not 0, and Δy is the difference in vertical distance between the relative coordinate axis x41 and the coordinate axis x31.

[0028] The corresponding control comparison module detects the signals of each of the measurement plates, calculates the Δy value on each of the measurement plates, and determines whether the Δy values ​​on each of the measurement plates are the same. If they are the same, the light fields emitted by all the laser profilometers are coplanar.

[0029] If the Δy values ​​are not the same, it is determined that the light fields emitted by the laser profilometer are not coplanar. At this time, the laser profilometer can be adjusted based on the Δy values. During adjustment, the position of the laser profilometer corresponding to the smallest Δy value remains unchanged, and the positions of other laser profilometers move toward the location of the laser profilometer until the Δy values ​​are consistent.

[0030] The beneficial effects of the present invention: The embodiments of the present invention provide a calibration indicator device for a laser profilometer and its usage method. The calibration indicator device includes multiple measuring plates and a positioning assembly for fixing the measuring plates. The multiple measuring plates are arranged around the outside of a steel rail to form a rectangular frame enclosing the cross-section of the steel rail. The multiple measuring plates are used to calibrate the coplanarity of the light fields emitted by multiple laser profilometers. To ensure the relative constant position of the measuring plates, they are fixed by the positioning assembly. This ensures that the relative position of the measuring plates remains unchanged during light field calibration and also fixes the measuring plates to the steel rail for scanning measurement after laser profilometer calibration. A virtual absolute coordinate system is provided on the measuring plates, and the positioning assembly... After the component is completely fixed to the measuring plate, one of the coordinate axes of the absolute coordinate system lies in space on the same plane perpendicular to the straight line where the rail is located. This ensures that the corresponding coordinate axes on all measuring plates are coplanar, and the contour enclosed by the corresponding coordinate axes can wrap around the rail. When the laser profilometer projects a calibration light field onto the measuring plate, if the light field coincides with the coordinate axis, or the difference between the light field and the coordinate axis is equal, it can be determined that the light fields projected by all laser profilometers are coplanar. At this time, when the contour images obtained after scanning by the contour measuring instrument are stitched together to form the overall contour image, there will be no misalignment. This makes the final overall contour shape of the rail accurate. That is, when multiple laser profilometers scan the entire rail contour shape, only one calibration indication is needed, which is highly efficient. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments or prior art, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A top view of a calibration indicator device for a laser profilometer provided in an embodiment of this application;

[0033] Figure 2 for Figure 1 Sectional view at point AA;

[0034] Figure 3 for Figure 1 Sectional view at point BB;

[0035] Figure 4 for Figure 2 A magnified view of a section at point C;

[0036] Figure 5 An end view of a calibration indicator device for a laser profilometer provided in an embodiment of this application;

[0037] Figure 6 A perspective view of a calibration indicator device for a laser profilometer provided in an embodiment of this application;

[0038] Figure 7 This is a schematic diagram showing the positional relationship between the coordinate axes y on each measuring plate of a laser profilometer calibration indicator device provided in this application embodiment, which are located on the same plane perpendicular to the straight line where the rail is located.

[0039] Figure 8 This is a schematic diagram showing the positional relationship between the coordinate axes x on each measuring plate of a laser profilometer calibration indicator device provided in this application embodiment and the plane perpendicular to the straight line where the rail is located.

[0040] Figure 9 This is a schematic diagram illustrating the relationship between the relative coordinate axis x or relative coordinate axis y, and the intensity of the coordinate axis and the center of the square, in a calibration indicator device for a laser profilometer provided in an embodiment of this application.

[0041] Figure 10 This is a schematic diagram showing the distribution of photosensitive elements on the measuring plate of a laser profilometer calibration indicator device provided in an embodiment of this application, and their positional relationship with the coordinate axes.

[0042] In the diagram: 1. Measuring plate; 2. Positioning component assembly; 21. Frame; 22. Wedge; 23. Connecting part; 24. Stroke-readable cylinder; 3. Coordinate axis; 31. Coordinate axis x; 32. Coordinate axis y; 41. Relative coordinate axis x; 42. Relative coordinate axis y; 5. Limiting plate; 6. Rail. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0044] In the description of this application, it should be understood that the terms "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," and "horizontal," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. In this application, " / " means "or." In the figures, structurally similar units are represented by the same reference numerals, and dashed lines in the figures indicate units that do not exist in the structure, merely illustrating the shape and position of the structure. Reference numbers and / or reference letters may be repeated in different examples in this application. Such repetition is for the purpose of simplification and clarity and does not in itself indicate the relationship between the various implementations and / or settings discussed.

[0045] To address the inefficiency of existing calibration devices that struggle to provide a single calibration indication of the entire rail profile, requiring multiple calibrations, multiple laser profilometers are necessary to achieve a single-scan profile. Each laser profilometer projects a light field onto the rail surface, forming a closed profile. However, if the light fields projected by each laser profilometer are not on the same plane, misalignment will occur when the profile images are stitched together to form the overall profile, leading to inaccuracies in the obtained rail profile. Therefore, a calibration device is needed to verify that the centers of the light field intensity emitted by each laser profilometer are spatially coplanar before multiple laser profilometers operate, ensuring scanning accuracy and resolving the aforementioned problem.

[0046] Therefore, such as Figures 1 to 8 As shown, this embodiment of the invention provides a calibration indicator device for a laser profilometer. Multiple laser profilometers are used to scan the overall profile of a rail. The calibration indicator device includes multiple measuring plates 1 and a positioning assembly 2 for fixing the measuring plates.

[0047] Multiple measuring plates 1 are arranged around the outside of the rail 6. The multiple measuring plates 1 are used to calibrate the coplanarity of the light fields emitted by all laser profilometers. The number of measuring plates 1 is at least four, and the measuring plates 1 form a frame that encloses the cross-section of the rail. Each measuring plate 1 preferably corresponds to one laser profilometer, and the light emitted by the laser profilometer is perpendicular to the measuring plate 1 and the straight line of the rail.

[0048] The measuring plate 1 can be used to detect the intensity of the center of the light field. The measuring plate 1 is preferably an array photoelectric detector plate, or the measuring plate 1 is a photoelectric detector plate. When the light field emitted by the laser profilometer shines on the corresponding measuring plate 1, the measuring plate 1 can convert the light signal into a digital signal. Based on the intensity of the light signal, the converted digital signal will also be different. For example, the stronger the light signal, the larger the digital signal.

[0049] Multiple measuring plates 1 are arranged in a circle around the outer side of the rail, which allows the light fields emitted by multiple laser profilometers to form a closed profile connected end to end on the surface of the rail 6. To ensure that the position of the measuring plates 1 is relatively constant, they are fixed by the positioning component 2. On the one hand, this ensures that the position of the measuring plates 1 remains relatively unchanged during light field calibration; on the other hand, the positioning component 2 also fixes the measuring plates 1 to the rail so that the scanning measurement is performed after the laser profilometer is calibrated.

[0050] Each of the measuring plates 1 is provided with a virtual absolute coordinate system, and the virtual absolute coordinate system is provided with preset coordinate axes. For example, one of the coordinate axes 3 of the absolute coordinate system set on each measuring plate 1 is located in space on the same plane perpendicular to the line where the rail is located, thereby ensuring that the corresponding coordinate axes 3 on all measuring plates 1 are coplanar, and the contour enclosed by the corresponding coordinate axes 3 can wrap around the rail.

[0051] When the laser profilometer projects a calibration light field onto the measuring plate 1, if the light field coincides with the coordinate axis 3, or if the difference between the light field and the coordinate axis is equal, it can be determined that the light fields projected by all laser profilometers are coplanar. At this time, the profile images obtained after scanning by the wheel profile measuring instrument will not be misaligned when spliced ​​to form the overall profile, thus ensuring that the final overall profile shape of the rail is accurate.

[0052] like Figure 1 , Figure 3 , Figure 5 and Figure 6As shown, in this embodiment, there are four measuring plates 1. These four measuring plates 1 are positioned corresponding to the top, bottom, left, and right sides of the rail 6's outline, respectively. Adjacent measuring plates 1 are perpendicular to each other, forming a rectangular frame that encloses the cross-section of the rail 6. The number of laser profilometers corresponds to the number of measuring plates 1, also being four, which scan the top, bottom, left, and right outlines of the rail 6. After the top, bottom, left, and right outlines of the rail 6 are scanned, they are pieced together to form the complete outline of the rail 6; thus, a single scan can complete the full scan of the rail's outline.

[0053] The positioning component 2 includes a frame 21 and stroke-readable cylinders 24. The frame 21 is used to hold the measuring plate 1. The frame 21 is a quadrilateral frame, and the four measuring plates 1 are respectively located on the four sides of the quadrilateral frame. Preferably, the quadrilateral frame has a two-layer structure, and the two layers of the quadrilateral frame are connected by the two ends of the stroke-readable cylinders 24. There are four stroke-readable cylinders 24, and the two ends of the four stroke-readable cylinders 24 are located at the four corners of the two layers of the quadrilateral frame. The stroke-readable cylinders 24 are also electrically connected to a control comparison module, which is used to calculate the displacement change value of each measuring plate 1.

[0054] The frame 21 is located at both ends of the rectangular frame formed by the four measuring plates 1; the cross-section of the frame 21 is preferably L-shaped, so that the frame 21 can fit the end side part and the outer surface part of the rectangular frame, thereby limiting the end side of the measuring plate 1.

[0055] refer to Figure 4 The frame 21 has wedges 22 on its inner wall corresponding to the measuring plate 1. Specifically, the frame 21 has inclined wedges 22 on its inner wall corresponding to the surface of the measuring plate 1. When the frame 21 and the measuring plate 1 initially mate, the inner wall of the frame 21 is in clearance fit with the outer wall of the rectangular frame. As the frames 21 move closer together and press against each other, the wedges 22 come into contact with the surface of the measuring plate 1. As the frames 21 move even closer, the wedges 22 further press against the surface of the measuring plate 1 until the measuring plates 1 are in full contact with each other and with the rail, and are thus fully fixed.

[0056] like Figure 6 As shown, a connecting part 23 is also provided at the corner of the frame 1. The stroke-readable cylinder 24 controls the frame 21 to move along the contour surface perpendicular to the rail 6 through the connecting part 23. The connecting parts 23 are all located at the corners of the frame 21, but they can also be located on the side of the frame 21, which is not limited here. The fact that they are located at the corners of the frame 21 ensures that the stroke-readable cylinder 24 located between the corresponding connecting parts 23 on the two frames 21 does not interfere with the frame 21 or the measuring plate 1, and the proximity between the frames 21 also depends on the action of the stroke-readable cylinder 24.

[0057] When the stroke-readable cylinder 24 shortens, it forces the frame 21 to move closer together via the connecting part 23, thereby fixing the measuring plate 1. The shortened stroke distance of the stroke-readable cylinder 24 can be sent to the control comparison module via a signal. The control comparison module compares whether the movement strokes of each stroke-readable cylinder 24 are consistent. When the movement strokes of each stroke-readable cylinder 24 are inconsistent, the movement of the stroke-readable cylinder 24 is adjusted to make them consistent.

[0058] During adjustment, the travel readable cylinder 24 with the longest travel distance maintains its travel distance unchanged, while the other travel readable cylinders 24 shorten their travel distances until they are consistent. This further ensures that each measuring plate 1 experiences the same fixing effect, and after the positioning assembly 2 completely fixes the measuring plate 1, one of the coordinate axes 3 of the absolute coordinate system lies in space on the same plane perpendicular to the straight line of the rail, reducing calibration errors. Furthermore, the travel readable cylinders 24 can accurately measure the travel distance, and in conjunction with the control comparison module, efficient and precise control can be achieved.

[0059] In this embodiment, since the measuring plate 1 is used for optical field calibration before the laser profilometer operates, the measuring plate 1 can be fixed to the end position of the rail by the positioning component assembly 2. After the optical field calibration of the laser profilometer is completed, the laser profilometer can scan the profile of the rail. After the measuring plate 1 is completely fixed, the measuring plate 1 located on the top and bottom surfaces of the rail 6 is in close contact with the rail. On the one hand, the close contact between the measuring plate 1 and the rail 6 is more conducive to the fixation of the measuring plate 1 and the position is more consistent with the rail, which facilitates the subsequent scanning by the laser profilometer. On the other hand, after the position of the measuring plate 1 is fixed, it is stationary relative to the rail. At this time, the error of the laser profilometer during the calibration and adjustment process will be relatively small, and the overall measurement accuracy will be higher.

[0060] Of course, when necessary, the measuring plate 1 can be fitted to the shape of the rail 6 so that the measuring plate 1 can detect whether the light field emitted by the laser profilometer is perpendicular to the measuring plate 1 during measurement. Since the surface of the measuring plate 1, which is fitted to the shape of the rail 6, has concave and convex surfaces, when a light field perpendicular to the measuring plate 1 shines on the concave and convex surfaces, one of the coordinates will be consistent. If a light field not perpendicular to the measuring plate 1 shines on the concave and convex surfaces, the light field on the concave and convex surfaces will be misaligned, thus determining whether the light field is perpendicular to the measuring plate 1.

[0061] Furthermore, the measuring plate 1 corresponding to the top and bottom surfaces of the rail 6 is located between the measuring plates 1 on both sides of the rail. That is, when the measuring plate 1 is fixed, the measuring plate 1 located on the side of the rail will tighten the measuring plate 1 on the top and bottom surfaces of the rail. When the frame 21 clamps the measuring plates 1 located on both sides of the rail, the measuring plates 1 located on both sides of the rail will be limited by the measuring plates 1 on the top and bottom surfaces of the rail, while the measuring plates 1 located on the top and bottom surfaces of the rail 6 will be limited by the rail. Based on this, the rectangular frame shape formed by the measuring plates 1 can be stable.

[0062] The width of the measuring plate 1 located on the top and bottom surfaces of the rail 6 is not less than the maximum width of the rail 6, and the height of the measuring plate 1 located on both sides of the rail 6 is not greater than the maximum height of the rail 6. Preferably, the measuring plate 1 located on the top and bottom surfaces of the rail 6 is equal to the maximum width of the rail, and the measuring plate 1 located on both sides of the rail is equal to the maximum height of the rail.

[0063] The width of the measuring plates 1 located on the top and bottom surfaces of the rail 6 is not less than the maximum width of the rail 6. Therefore, the measuring plates 1 can completely cover the top and bottom surfaces of the rail 6, and when the measuring plates 1 are equal to the maximum width of the rail, they fit snugly against the rail. Similarly, the height of the measuring plates 1 located on both sides of the rail 6 is not greater than the maximum height of the rail 6, so that the rectangular frame formed by the measuring plates 1 can completely enclose the outline of the rail 6. Furthermore, when the measuring plates 1 located on the top and bottom surfaces of the rail 6 are equal to the maximum width of the rail, and the measuring plates 1 located on both sides of the rail are equal to the maximum height of the rail 6, the frame formed by the measuring plates 1 distributed around the circumference of the rail 6 can fit snugly against the rail 6, and after the measuring plates 1 are completely fixed, the measuring plates 1 and the rail 6 are relatively fixed.

[0064] refer to Figure 5 The measuring plate 21 is also provided with a limiting plate 5 that matches the top contour of the rail 6. To further facilitate the installation and fixing of the measuring plate 1, a limiting plate 5 that matches the top contour of the rail 6 is provided on the bottom surface of the measuring plate 1 corresponding to the top surface of the rail. When the measuring plate 1 is completely fixed, the limiting plate 5 is tightly fitted to the top of the rail 6.

[0065] Based on the setting of the limiting plate 5, the relative position of the measuring plate 1 and the rail can be determined when the measuring plate 1 forms the frame. Preferably, the limiting plate 5 is symmetrically arranged about the central axis of the measuring plate 1 corresponding to the top surface of the rail. When there are two limiting plates 5, and the two limiting plates 5 are symmetrically arranged about the central axis of the measuring plate 1 corresponding to the top surface of the rail, the rectangular frame formed by the measuring plates 1 is symmetrically distributed about the axis of symmetry of the cross-section of the rail 6. In this way, when the laser profilometer is arranged, it can also be symmetrically distributed about the axis of symmetry of the cross-section of the rail 6, making it easier to splice the scanned rail 6 profile to form the overall profile of the rail 6.

[0066] According to the calibration indicator device for the laser profilometer in the above embodiments, the present invention also provides a method for using the calibration indicator device for the laser profilometer, the method comprising:

[0067] Step S10: Fix multiple measuring plates using positioning components, and arrange the multiple measuring plates around the outside of the rail to form a rectangular frame that wraps around the cross-section of the rail.

[0068] Step S20: A virtual absolute coordinate system is set on each of the measuring plates. A preset coordinate axis in the absolute coordinate system is located on the same plane perpendicular to the straight line of the rail in space, so as to determine that the preset coordinate axes corresponding to all measuring plates are coplanar.

[0069] In step S30, multiple laser profilometers project calibration light fields onto the measuring plate. If the calibration light field coincides with the preset coordinate axis, or the difference between the calibration light field and the preset coordinate axis is equal, it is determined that the light fields projected by all laser profilometers are coplanar. At this time, when the contour images obtained by multiple laser profilometers are stitched together to form an overall contour image, there will be no misalignment, thus obtaining a complete rail contour shape.

[0070] Preferably, step S20 specifically includes: the absolute coordinate system includes coordinate axis x31 and coordinate axis y32;

[0071] Once the measuring plates are fixed, if the coordinate axes x31 on each measuring plate are located on the same plane perpendicular to the straight line where the rail is located, and the coordinate axes y32 on each measuring plate are parallel to each other;

[0072] Preferably, step S30 specifically includes:

[0073] When the light field emitted by the laser profilometer illuminates the corresponding surface of the measuring plate, the measuring plate constructs a relative coordinate axis x41 based on the intensity position of the center of the light field;

[0074] When the calibration light field emitted by the laser profilometer onto the measuring plate coincides with coordinate axis x31, that is, it coincides with coordinate axis x31 relative to coordinate axis x41, at this time Δy is 0; then the light fields emitted by all laser profilometers are coplanar.

[0075] When the calibration light field emitted by the laser profilometer onto the measuring plate 1 does not coincide with the coordinate axis x31, it does not coincide with the coordinate axis x31 relative to the coordinate axis x41. At this time, Δy is not 0, and Δy is the difference in vertical distance between the relative coordinate axis x41 and the coordinate axis x31.

[0076] The corresponding control comparison module detects the signals of each of the measurement plates, calculates the Δy value on each of the measurement plates, and determines whether the Δy values ​​on each of the measurement plates are the same. If they are the same, the light fields emitted by all the laser profilometers are coplanar.

[0077] If the Δy values ​​are not the same, it is determined that the light fields emitted by the laser profilometer are not coplanar. At this time, the laser profilometer can be adjusted based on the Δy values. During adjustment, the position of the laser profilometer corresponding to the smallest Δy value remains unchanged, and the positions of other laser profilometers move toward the location of the laser profilometer until the Δy values ​​are consistent.

[0078] Specifically, such as Figure 7 As shown, in step S20 of the above embodiment, taking an absolute coordinate system including coordinate axes x31 and y32 as an example, after the measuring plate 1 is completely fixed, the coordinate axes x31 on each measuring plate 1 are located on the same plane perpendicular to the straight line where the rail is located. At this time, the coordinate axes y32 on each measuring plate 1 are parallel to each other.

[0079] like Figure 7 As shown, in step S30 of the above embodiment, when the light field emitted by the laser profilometer illuminates the surface of the corresponding measuring plate 1, the measuring plate 1 constructs a relative coordinate axis x41 based on the intensity position of the light field center. When the profilometer emits a calibration light field onto the measuring plate 1 that coincides with coordinate axis x31, the relative coordinate axis x41 coincides with coordinate axis x31, and at this time, Δy is 0. At this time, the light fields emitted by all profilometers are coplanar.

[0080] When the calibration light field projected by the contour scanner onto the measuring plate 1 does not coincide with coordinate axis x31, the relative coordinate axis x41 does not coincide with coordinate axis x31. At this time, Δy is not 0, and Δy is the difference in vertical distance between relative coordinate axis x41 and coordinate axis x31.

[0081] The measurement board 1, which is connected to the corresponding control comparison module, sends the above measurement information to the control comparison module. The control comparison module calculates the Δy value calculated on each measurement board 1 and determines whether the Δy values ​​are the same. If they are the same, the light fields emitted by all contour scanners are coplanar.

[0082] If the Δy values ​​are not the same, it is determined that the light fields emitted by the contour scanner are not coplanar. In this case, the contour scanner can be adjusted based on the Δy values. During adjustment, the position of the contour scanner corresponding to the smallest Δy value remains unchanged, while the positions of other contour scanners move towards the location of that contour scanner until the Δy values ​​are consistent.

[0083] Similarly, such as Figure 8As shown, in step S20 of the above embodiment, taking an absolute coordinate system including coordinate axis x31 and coordinate axis y32 as an example, when the measuring plate 1 is completely fixed, the coordinate axis y32 on each measuring plate 1 is located on the same plane perpendicular to the straight line where the rail is located. At this time, the coordinate axis x31 on each measuring plate 1 is parallel to each other.

[0084] like Figure 8 As shown, in step S30 of the above embodiment, when the light field emitted by the laser profilometer illuminates the surface of the corresponding measuring plate 1, the measuring plate 1 constructs a relative coordinate axis y42 based on the intensity position of the center of the light field.

[0085] When the profile scanner projects a calibration light field onto the measuring plate 1 that coincides with coordinate axis y32, it also coincides with coordinate axis y42 relative to coordinate axis y32, at which point Δx is 0. At this point, the light fields projected by all profile scanners are coplanar.

[0086] When the calibration light field projected by the contour scanner onto the measuring plate 1 does not coincide with coordinate axis y32, then the relative coordinate axis y42 does not coincide with coordinate axis y32, and at this time Δx is not 0. Δx is the difference in vertical distance between the relative coordinate axes x42 and x32.

[0087] The measurement board 1, which is connected to the corresponding control comparison module, sends the above measurement information to the control comparison module. The control comparison module calculates the Δx value calculated on each measurement board 1 and determines whether the Δx values ​​are the same. If they are the same, the light fields emitted by all contour scanners are coplanar.

[0088] If the values ​​of Δx are not the same, the light fields emitted by the contour scanner are not coplanar. In this case, the contour scanner can adjust its position based on Δx.

[0089] During adjustment, the position of the contour scanner corresponding to the smallest Δx value remains unchanged, while the positions of other contour scanners move toward the location of that contour scanner until the Δx value is consistent.

[0090] Figure 9 This application provides a calibration indicator device for a laser profilometer, which relates the coordinate axis x or y to the coordinate axis and the intensity of the coordinate axis relative to the center of the square. For example... Figure 9 As shown, the light field intensity is greatest at the middle position of coordinate axis 3, and gradually decreases at the two sides of coordinate axis 3.

[0091] The absolute coordinate system can be calibrated by the system, while the relative coordinate system can be calibrated by the photosensitive elements arranged in a matrix on the measuring plate 1, with reference... Figure 10 .

[0092] Figure 10This diagram illustrates the distribution of photosensitive elements on a measuring plate in a calibration indicator device for a laser profilometer, as well as their positional relationship with the coordinate axes, provided in an embodiment of this application. Figure 10 As shown, the absolute coordinate system can be calibrated by the system, and the relative coordinate system can be calibrated by the photosensitive elements arranged in a matrix on the measuring plate 1. The photosensitive elements are evenly distributed on the measuring plate 1.

[0093] The above-described calibration indicator device scheme for the laser profilometer can accurately and quickly determine whether the light fields emitted by the profilometer are coplanar, and can quickly adjust the position of the profilometer based on the detected values ​​so that the light fields emitted by each profilometer are in a coplanar state.

[0094] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A calibration indicating device for laser profilers, a plurality of laser profilers being used to scan the overall profile of a rail, characterised in that, The calibration indicator device includes multiple measuring plates and a positioning assembly for fixing the measuring plates; Among them, multiple measuring plates are arranged around the outside of the rail, and the multiple measuring plates are used to calibrate the coplanarity of the light fields emitted by multiple laser profilometers; The positioning component includes a frame and a stroke-readable cylinder. The frame is used to hold the measuring plate. A connecting part is also provided at the corner of the frame. The stroke-readable cylinder controls the frame to move along a direction perpendicular to the profile surface of the rail through the connecting part. The number of measuring plates is 4. The 4 measuring plates are respectively set at the top, bottom, left and right positions of the rail profile surface. The adjacent measuring plates are perpendicular to each other to form a rectangular frame that wraps around the cross-section of the rail. The frame is a two-layer quadrilateral frame, and the four measuring plates are located on the four sides of the quadrilateral frame respectively; wherein, the two layers of quadrilateral frame are connected by the two ends of the stroke-readable cylinder; The number of stroke-readable cylinders is 4, and the two ends of the 4 stroke-readable cylinders are located at the four corners of the two layers of quadrilateral frames.

2. A calibration indicating device for a laser profiler according to claim 1, characterized in that The stroke-readable cylinder is also electrically connected to a control comparison module, which is used to calculate the displacement change value of each of the measuring plates.

3. The calibration indicating device for a laser profiler of claim 1, wherein, The measuring plate is a photoelectric detection plate; each measuring plate is provided with a virtual absolute coordinate system, and the virtual absolute coordinate system is provided with preset coordinate axes.

4. The calibration indicator device for a laser profilometer according to claim 1, characterized in that, The frame has wedges on the inner wall corresponding to the measuring plate.

5. The calibration indicator device for a laser profilometer according to claim 1, characterized in that, The measuring plate is also equipped with a limiting plate that matches the top contour of the rail.

6. A method of using a calibration indicator device for a laser profilometer, characterized in that, The method of use includes: Step S10: Fix multiple measuring plates using positioning components, and arrange the multiple measuring plates around the outside of the rail to form a rectangular frame that wraps around the cross-section of the rail. Step S20: A virtual absolute coordinate system is set on each of the measuring plates. A preset coordinate axis in the absolute coordinate system is located on the same plane perpendicular to the straight line of the rail in space, so as to determine that the preset coordinate axes corresponding to all measuring plates are coplanar. In step S30, multiple laser profilometers project calibration light fields onto the measuring plate. If the calibration light field coincides with the preset coordinate axis, or the difference between the calibration light field and the preset coordinate axis is equal, then it is determined that the light fields projected by all laser profilometers are coplanar. At this time, when the profile images obtained after scanning by multiple laser profilometers are stitched together to form an overall profile image, there will be no misalignment, thus obtaining a complete rail profile shape. Step S20 specifically includes: the absolute coordinate system includes coordinate axis x31 and coordinate axis y32; Once the measuring plates are fixed, if the coordinate axes x31 on each measuring plate are located on the same plane perpendicular to the straight line where the rail is located, and the coordinate axes y32 on each measuring plate are parallel to each other; Step S30 specifically includes: When the light field emitted by the laser profilometer illuminates the corresponding surface of the measuring plate, the measuring plate constructs a relative coordinate axis x41 based on the intensity position of the center of the light field; When the calibration light field emitted by the laser profilometer onto the measuring plate coincides with coordinate axis x31, that is, it coincides with coordinate axis x31 relative to coordinate axis x41, at this time Δy is 0; then the light fields emitted by all laser profilometers are coplanar. When the calibration light field emitted by the laser profilometer onto the measuring plate 1 does not coincide with the coordinate axis x31, it does not coincide with the coordinate axis x31 relative to the coordinate axis x41. At this time, Δy is not 0, and Δy is the difference in vertical distance between the relative coordinate axis x41 and the coordinate axis x31. The corresponding control comparison module detects the signals of each of the measurement plates, calculates the Δy value on each of the measurement plates, and determines whether the Δy values ​​on each of the measurement plates are the same. If they are the same, the light fields emitted by all the laser profilometers are coplanar. If the Δy values ​​are not the same, it is determined that the light fields emitted by the laser profilometer are not coplanar. At this time, the laser profilometer can be adjusted based on the Δy values. During adjustment, the position of the laser profilometer corresponding to the smallest Δy value remains unchanged, and the positions of other laser profilometers move toward the location of the laser profilometer until the Δy values ​​are consistent.

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