CN215676899U - Calibration plate for installation and debugging of 3D profile measuring instrument - Google Patents
Calibration plate for installation and debugging of 3D profile measuring instrument Download PDFInfo
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- CN215676899U CN215676899U CN202121195929.6U CN202121195929U CN215676899U CN 215676899 U CN215676899 U CN 215676899U CN 202121195929 U CN202121195929 U CN 202121195929U CN 215676899 U CN215676899 U CN 215676899U
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Abstract
The utility model discloses a calibration plate for installing and debugging a 3D contour measuring instrument, which comprises a base plate and a plurality of three-dimensional mark blocks fixed on the base plate, wherein the shapes of the three-dimensional mark blocks meet the condition that all contour lines of the three-dimensional mark blocks are visible lines in a top view of the calibration plate. According to the utility model, the three-dimensional mark blocks are arranged on the calibration plate, whether the measuring instrument moves at a constant speed along a straight line is judged according to whether the contour line of each three-dimensional mark block on the calibration plate scanned by the 3D contour measuring instrument is abnormally deformed or not and whether the height of each point of each three-dimensional mark block is changed or not, and whether the collinear laser contour measuring instrument scans at a constant speed along the straight line in the using process is quantitatively judged.
Description
Technical Field
The utility model relates to a calibration plate structure, in particular to a calibration plate for installation and debugging of a 3D contour measuring instrument.
Background
The line laser profile measuring instrument is a scanning device based on line laser as a light source, the surface profile of an object is constructed based on the height of the surface of the object in the scanning process, and a user can judge whether the size of the object to be measured is normal or not and whether flaws exist on the surface or not based on the surface profile of the object to be measured. The line laser profile measuring instrument can only adopt one line each time, and the whole measured object generally needs thousands of lines to be spliced into a profile image. In practical use, the measured object (or the line laser profile measuring instrument) is required to move along a straight line. When the line laser profile measuring instrument moves, the encoder can be accessed to send a pulse trigger signal to the equipment, so that the measuring instrument is controlled to move at a constant speed for scanning and sampling, but whether the measuring instrument performs uniform sampling along a straight line or not is not quantitatively judged.
However, most calibration plates in the prior art are limited to two-dimensional calibration, that is, the calibration plates can only provide a plane calibration line, and are not suitable for analyzing whether the measuring instrument is uniform along a straight line or not for scanning point cloud data of the calibration plates based on the line laser profile measuring instrument.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides the calibration plate for installing and debugging the 3D contour measuring instrument, which can obtain point cloud data convenient for analyzing whether the measuring instrument is at a constant speed along a straight line, and further realize quantitative analysis on whether the measuring instrument is at a constant speed along the straight line.
The utility model provides a calibration plate for installing and debugging a 3D contour measuring instrument, which comprises a base plate and a plurality of three-dimensional mark blocks fixed on the base plate.
As a further optimization of the above scheme, the shape of the three-dimensional mark block satisfies that all contour lines of the three-dimensional mark block are visible lines in the top view of the calibration board.
As a further optimization of the above scheme, the three-dimensional mark block is arranged in a prismoid-shaped structure, and the bottom surface of the three-dimensional mark block is fixed on the base plate.
As a further optimization of the above scheme, the three-dimensional mark blocks are arranged in a regular quadrangular frustum pyramid shape, the base plate is arranged in a rectangular structure, and each side of the square on the upper surface of each three-dimensional mark block is correspondingly parallel to the side of the rectangular base plate.
As a further optimization of the scheme, the three-dimensional mark blocks are arranged on the base plate in an N x N matrix array, and the distance between the center positions of squares on the upper surfaces of two adjacent three-dimensional mark blocks is N times of the side length of the squares (N is more than or equal to 2).
As a further optimization of the scheme, the distance between the center positions of the squares on the upper surfaces of the two adjacent three-dimensional mark blocks is 2 times of the side length of the squares.
As a further optimization of the above scheme, an inclination angle between the side surface of the regular quadrangular frustum pyramid three-dimensional mark block and the base plate is set to be 45 degrees.
As a further optimization of the above scheme, the height of the regular quadrangular frustum pyramid three-dimensional mark block is determined based on the measurement range and the measurement precision of the measuring instrument.
As further optimization of the scheme, the calibration plate is made of ceramic.
The calibration plate for installing and debugging the 3D contour measuring instrument has the following beneficial effects:
1. the three-dimensional mark blocks are arranged on the calibration plate, whether the measuring instrument moves at a constant speed along a straight line is judged according to whether the contour line of each three-dimensional mark block on the calibration plate scanned by the 3D contour measuring instrument is abnormally deformed or not and whether the height of each point of each three-dimensional mark block is changed or not, and whether the alignment laser contour measuring instrument scans at a constant speed along the straight line or not in the using process is quantitatively judged.
2. The three-dimensional mark block is set to be of a frustum pyramid-shaped structure, so that all contour lines of the three-dimensional mark block are visible lines in a top view of the calibration plate, and dead-angle-free scanning of the 3D contour measuring instrument is realized; simultaneously three-dimensional mark piece sets up to after the terrace with edge shape structure, the upper surface of all three-dimensional mark pieces on the calibration board is on the coplanar height, when 3D profile measuring instrument is just adjusting the calibration board of below and is scanning, whether the upper surface of all three-dimensional mark pieces on the calibration board that scans out is on the coplanar height according to whether, judge whether 3D profile measuring instrument takes place shake from top to bottom in the scanning removal in-process, compare in three-dimensional mark piece upper surface for not being on the dull and stereotyped non-planar structure of sign board base, terrace with edge shape structure in this application sets up, the process of judgement to 3D profile measuring instrument shake from top to bottom has been simplified.
3. The three-dimensional mark blocks are arranged into a regular quadrangular frustum pyramid shaped structure, the base plate is arranged into a rectangular structure, and each side of the square on the upper surface of each three-dimensional mark block is correspondingly parallel to the side of the rectangular base plate. The method simplifies the judgment process of whether the side length of the square on the upper surface in the point cloud data of the calibration plate is subjected to stretching deformation or not, and further simplifies the judgment process of whether the motion track of the measuring instrument is subjected to left-right shaking or not and whether non-uniform motion occurs or not.
Drawings
FIG. 1 is a top view of a calibration plate for 3D profilometer installation and debugging according to the present invention;
FIG. 2 is a perspective view of a calibration plate for installation and debugging of a 3D profilometer of the present invention;
fig. 3-1 and 3-2 are schematic views of the scan dead space of the calibration plate in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, the present embodiment provides a calibration board for installation and debugging of a 3D profilometer, which includes a base plate 1 and a plurality of solid marker blocks 2 fixed on the base plate 1.
In this embodiment, the calibration board is placed right below the measuring instrument, and the measuring instrument scans by moving, theoretically, when the profile measuring instrument moves at a constant speed along a straight line and the calibration board is located right below, each position profile line of the calibration board scanned by the measuring instrument should be uniform without stretching deformation, and if the profile measuring instrument does not move at a constant speed and a straight line in a strict sense, each position profile line scanned by the measuring instrument may be abnormally deformed.
In this embodiment, whether the measuring instrument moves at a constant speed along a straight line is determined according to whether the contour lines of each three-dimensional mark block 2 on the calibration plate scanned by the 3D contour measuring instrument are abnormally deformed (including deformation in the length and width directions compared with the actual) with the actual contour lines and whether the heights of each point of each three-dimensional mark block 2 (compared with the actual heights) are changed.
Further, the shape of the three-dimensional mark block 2 is such that all contour lines of the three-dimensional mark block 2 are visible lines in the top view of the calibration board.
When the 3D contour measuring instrument scans the calibration board right below, when the three-dimensional mark block 2 has a scanning dead angle, the contour measuring instrument cannot clearly scan all contour lines of the three-dimensional mark block 2, and thus it cannot be determined whether the length, width, and position height of each scanned contour line are consistent with the actual contour line.
Preferably, the three-dimensional mark block 2 is arranged in a frustum pyramid shape, and the bottom surface of the three-dimensional mark block 2 is fixed on the base plate 1.
Namely, the area of the upper surface of the three-dimensional mark block 2 is smaller than that of the lower surface, and the lower surface of the three-dimensional mark block 2 is fixed on the base plate 1, so that the 3D contour measuring instrument can scan the three-dimensional mark block 2 without dead angles.
Referring to fig. 3-1 and 3-2, in this embodiment, the frustum-shaped structure shown in fig. 3-2, in which the area of the upper surface is smaller than that of the lower surface, is adopted instead of the frustum-shaped structure shown in fig. 3-1, which has an area equal to or larger than that of the lower surface, so that the scanning dead angle existing in the process of scanning the calibration board when the laser line of the profile measuring instrument is not perpendicular to the plane where the calibration board is located, is effectively avoided.
Simultaneously three-dimensional mark piece 2 sets up to after the terrace with edge shape structure, the upper surface of all three-dimensional mark pieces 2 on the calibration board is on the coplanar height, when 3D profile measuring instrument is just scanning the calibration board of below, can be according to whether the upper surface of all three-dimensional mark pieces 2 on the calibration board that scans out is on the coplanar height, judge whether 3D profile measuring instrument takes place shake from top to bottom at the scanning removal in-process, compare in the non-planar structure that three-dimensional mark piece 2 upper surface is not on the flat board 1 of sign board base, terrace with edge shape structure in this application sets up, the judgement process of shaking from top to bottom has been simplified to 3D profile measuring instrument.
Furthermore, the three-dimensional mark block 2 is in a regular quadrangular frustum pyramid shape, the base plate 1 is in a rectangular structure, and each side of the square on the upper surface of the three-dimensional mark block 2 is parallel to the side of the rectangular base plate 1.
Each side of the square on the upper surface of the three-dimensional mark block 2 is correspondingly parallel to the side of the rectangular base plate 1, so that whether the side length of the square on the upper surface in the scanned point cloud data of the calibration plate is in telescopic deformation or not can be conveniently judged, whether the motion track of the measuring instrument is in left-right shaking or not can be judged according to whether the side length of the square perpendicular to the scanning moving direction of the measuring instrument is in deformation or not, and whether the motion track of the measuring instrument is in non-uniform motion or not can be judged according to whether the side length of the square parallel to the scanning advancing direction of the measuring instrument is in deformation or not.
In order to simplify the coordinate position relation of each three-dimensional mark block 2 on the calibration plate and further simplify various coordinate data calculation and analysis based on the calibration plate, the three-dimensional mark blocks 2 are arranged on the base plate 1 in an N x N matrix array, and the distance between the center positions of squares on the upper surfaces of two adjacent three-dimensional mark blocks 2 is N times of the side length of the squares (N is more than or equal to 2).
Preferably, the distance between the center positions of the squares on the upper surfaces of two adjacent three-dimensional mark blocks 2 is 2 times of the side length of the squares.
The plane where the square on the upper surface of the N × N regular quadrangular frustum solid marker blocks 2 is located is taken as a first plane, and N is taken as 2 as an example for explanation, then the interval between two adjacent sides of two adjacent squares on the first plane is set as a length of one side of the square, that is, the distance between any two adjacent angular points (the angular points are the angular points of the squares) on the first plane is a length of one side, so that the calculation amount in the coordinate data calculation and analysis process, such as coordinate system conversion and the like, when the calibration is performed through a calibration board is effectively simplified. Furthermore, when the coordinate system mapping relation is solved through the calibration plate, a plurality of sets of coordinates corresponding to the corner points can be selected for solving.
In order to avoid the scanning dead angle of the profile measuring instrument and simultaneously consider the definition and the identifiability of the scanning profile, the inclination angle between the side surface of the regular quadrangular frustum pyramid three-dimensional mark block 2 and the base plate 1 is set to be 45 degrees, so that the clear division of the side surface profile of the regular quadrangular frustum pyramid three-dimensional mark block 2 and the profile boundary of the top square is realized.
Further, the height of the regular quadrangular frustum pyramid solid sign block 2 is determined based on the measurement range and the measurement accuracy of the measuring instrument. Generally, 1/4 for the z (height) direction measurement range can be taken and tested near the gage length of the gauge in actual use.
Furthermore, in order to ensure the calibration precision of the calibration plate, the calibration plate is made of ceramic.
The working principle is as follows: and (3) using the calibration plate as a scanned object, comparing the scanning result with the standard calibration plate to judge whether to move at a constant speed along a straight line, specifically, placing the calibration plate under the measuring instrument, and scanning by the measuring instrument. Theoretically, when the calibration plate is located under the measuring instrument, that is, the plane of the calibration plate is perpendicular to the plane of the laser line, and one edge of the calibration plate is parallel to the moving direction of the profile measuring instrument, and meanwhile, when the 3D profile measuring instrument meets the requirements of uniform motion and linear motion in a strict sense, the profile line at each position of the calibration plate swept out by the measuring instrument should be uniform and free of stretching deformation. Furthermore, whether the contour measuring instrument is strictly linear motion can be judged according to whether the height coordinates of the points on the upper surface of the regular quadrangular frustum three-dimensional mark block 2 in the scanning result are all equal and the widths perpendicular to the motion direction are consistent, whether the contour measuring instrument is strictly uniform motion can be judged according to whether the lengths of the positive direction of the upper surface of the regular quadrangular frustum three-dimensional mark block 2 along the motion direction of the contour measuring instrument are all equal, specifically, if the height coordinates of the points on the upper surface of the regular quadrangular frustum three-dimensional mark block 2 in the scanning result are inconsistent, the contour measuring instrument shakes up and down in the moving process, if the widths of the squares on the upper surface of the regular quadrangular frustum three-dimensional mark block 2 in the scanning result perpendicular to the motion direction are inconsistent, the contour measuring instrument shakes left and right, if the lengths of the squares on the upper surface of the regular quadrangular frustum three-dimensional mark block 2 in the scanning result parallel to the motion direction are inconsistent, the profile gauge moves at a non-uniform speed.
The present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make various modifications without creative efforts from the above-described conception, and fall within the scope of the present invention.
Claims (8)
1. The calibration plate for installation and debugging of the 3D contour measuring instrument is characterized by comprising a base plate and a plurality of three-dimensional mark blocks fixed on the base plate, wherein the shape of each three-dimensional mark block meets the condition that all contour lines of the three-dimensional mark blocks are visible lines in a top view of the calibration plate.
2. The calibration plate for installation and debugging of the 3D contour measuring instrument as claimed in claim 1, wherein the three-dimensional mark block is in a frustum pyramid-shaped structure, and the bottom surface of the three-dimensional mark block is fixed on the base plate.
3. The calibration plate for installation and debugging of 3D contour measuring instrument as claimed in claim 2, wherein said three-dimensional mark blocks are arranged in a regular quadrangular frustum pyramid shape structure, said base plate is arranged in a rectangular structure, and each side of the square on the upper surface of each three-dimensional mark block is correspondingly parallel to the side of the rectangular base plate.
4. The calibration plate for installation and debugging of the 3D profile measuring instrument as claimed in claim 3, wherein the three-dimensional mark blocks are arranged on the base plate in an N x N matrix array, and the distance between the centers of the squares on the upper surfaces of two adjacent three-dimensional mark blocks is N times of the side length of the squares (N is more than or equal to 2).
5. The calibration plate for installation and debugging of the 3D contour measuring instrument as claimed in claim 4, wherein the distance between the center positions of the squares on the upper surfaces of two adjacent three-dimensional mark blocks is 2 times of the side length of the squares.
6. The calibration plate for installation and debugging of 3D contour measuring instrument as claimed in claim 3, wherein the inclination angle between the side surface of the square frustum solid sign block and the base plate is set to be 45 degrees.
7. The calibration plate for installation and debugging of 3D contour measuring instrument according to claim 3, wherein the height of said regular quadrangular frustum of prism solid sign block is determined based on the measuring range and measuring accuracy of the measuring instrument.
8. The calibration plate for installation and debugging of 3D contour measuring instrument according to claim 1, wherein the calibration plate is made of ceramic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121195929.6U CN215676899U (en) | 2021-05-31 | 2021-05-31 | Calibration plate for installation and debugging of 3D profile measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121195929.6U CN215676899U (en) | 2021-05-31 | 2021-05-31 | Calibration plate for installation and debugging of 3D profile measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215676899U true CN215676899U (en) | 2022-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121195929.6U Active CN215676899U (en) | 2021-05-31 | 2021-05-31 | Calibration plate for installation and debugging of 3D profile measuring instrument |
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| Country | Link |
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| CN (1) | CN215676899U (en) |
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2021
- 2021-05-31 CN CN202121195929.6U patent/CN215676899U/en active Active
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| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: Fuhuang New Vision Building, No. 77 Wutaishan Road, Baohe Economic Development Zone, Hefei City, Anhui Province, 230051 Patentee after: Hefei Zhongke Junda Vision Technology Co.,Ltd. Address before: 230088 Room 107, Building 3, Tiandao 10 Software Park, Hefei High-tech Zone, Anhui Province Patentee before: HEFEI FUHUANG JUNDA HIGH-TECH INFORMATION TECHNOLOGY Co.,Ltd. |
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