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Planeness detection method and system of line laser

A flatness detection and line laser technology, applied in the field of structured light measurement, can solve the problems that the laser plane deviates from the ideal plane, the processing quality is uneven, and the measurement accuracy is affected.

Active Publication Date: 2019-07-26
易思维(杭州)科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ideally, the laser plane projected by the line laser is an ideal standard plane. However, due to the uneven processing quality of various line lasers on the market, the laser plane projected by the actual laser deviates from the ideal plane and presents an arc surface, such as figure 1 As shown, such an error will affect the final measurement accuracy, especially in the measurement scene with a large field of view, which is very necessary for the flatness detection of line lasers

Method used

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  • Planeness detection method and system of line laser
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  • Planeness detection method and system of line laser

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Experimental program
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Embodiment 1

[0043] A method for detecting flatness of a line laser, comprising the steps of:

[0044] 1) Use such as figure 2 In the detection system shown, the line laser 1 is fixed on the support part 2, and the height of the line laser 1 is kept fixed, the line laser 1 starts to work, and the photodetector 3 receives the laser bar projected by the line laser; the photodetector 3 and the line The distance between the lasers 1 is the measuring working distance of the line lasers 1;

[0045] Keeping the position of the line laser 1 unchanged, the photodetector 3 is installed on a high-precision guide rail and moves horizontally on the high-precision guide rail. In this embodiment, the photodetector adopts a linear array CCD, and the linear array CCD moves a distance d each time. d=3mm, record the pixel data (u ij ,v ij ), move m times to generate m segments of laser bars;

[0046] Note that the number of pixels in each segment of the laser bar is n, and the pixel coordinates on each ...

Embodiment 2

[0054] A method for detecting flatness of a line laser, comprising the steps of:

[0055] ① use such as figure 2 In the detection system shown, the line laser 1 is fixed on the one-dimensional turntable 2 and starts to work, and the photodetector 3 receives the laser bar projected by the line laser 1; in this embodiment, the one-dimensional turntable 2 adopts a multi-tooth indexing table; The photodetector adopts linear array CCD;

[0056] Change the relative position of the line laser 1 and the photodetector 3: keep the position of the photodetector 3 unchanged, use a multi-tooth indexing table to horizontally rotate the line laser 1, and rotate the angle θ each time, θ=0.5°, record each rotation After that, the pixel data of the laser bar is obtained; rotate r times to obtain the m-segment laser bar; r×θ≥β, β is the divergence angle of the laser bar;

[0057] Note that the number of pixels in each segment of the laser bar is n, and the pixel coordinates on each segment of...

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Abstract

The invention discloses a planeness detection method and system of a line laser. The planeness detection method comprises the steps that the line laser starts to work, and a photoelectric detector receives a laser bar projected by the line laser; the relative positions of the line laser and the photoelectric detector are transformed m times, and m segments of laser bars are obtained; pixel coordinates on each segment of the laser bars are (uij, vij); centers of the m segments of the laser bars are extracted respectively, and the pixel coordinates are converted to physical coordinates (xij, yij); a point set (x'ij, y'ij); and the point set (x'ij, y'ij) is straight line fitted, a maximum fitting residual value is obtained and used as an evaluation parameter Q, and planeness of the to-be-measured line laser is evaluated. The method can obtain true planeness data of the laser light plane to judge whether the line laser meets the measurement requirements or not.

Description

technical field [0001] The invention relates to the technical field of structured light measurement, in particular to a method and system for detecting the flatness of a line laser. Background technique [0002] With the rapid development of machine vision, line structured light three-dimensional measurement technology is widely used in industrial production due to its high precision and strong real-time performance. Line structured light three-dimensional measurement technology uses line lasers to project laser bars onto the surface of the measured object. The structured light image is collected by the camera, and the three-dimensional shape measurement of the measured object is realized by processing the deformed stripes in the image. [0003] Ideally, the laser plane projected by the line laser is an ideal standard plane. However, due to the uneven processing quality of various line lasers on the market, the laser plane projected by the actual laser deviates from the idea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02G01B11/30
CPCG01B11/002G01B11/303G01M11/0242
Inventor 郭思阳郭磊
Owner 易思维(杭州)科技有限公司