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Machine Vision Anlaysis of Laser Marking Quality

Author: LiJingQuan
Tutor: LiYongDa
School: Changchun University of Science and Technology
Course: Optics
Keywords: Laser Marking Machine Vision Laser triangulation Laser speckle New Algorithm
CLC: TN249
Type: Master's thesis
Year: 2008
Downloads: 140
Quote: 2
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Abstract


With laser marking technology matures , sparring standard online detection of increasing demand . Laser triangulation can be used to detect the playing standard depth, width , and other information . Laser triangulation method is based on the traditional triangulation based on an optical 3D surface measurement techniques , due to its non-contact , no damage , speed , high precision and intelligent features , in industrial inspection , machine vision the field is widely available. Laser triangulation technology for in-depth study of the papers on laser marking quality BIV (Bulit In Vision) detection system , how to eliminate the influence of the speckle , and propose a new algorithm for seeking laser intensity center of diffuse reflectance the purpose is to improve the performance and the detection accuracy of the detection system . The main content and innovative results of this study are as follows : through on laser triangulation universal formula marking depth into a different angle with the optical axis of the lens , the CCD area array , draw simplified formula , finding the best match condition. 2 hit the mark detection system accuracy factors affecting analyze proposed approach can improve the measurement accuracy of the system for some of the above problems . Seek the key marking depth is seeking laser diffuse reflection light intensity of the position of the centerline , the solution accuracy directly related to the measurement accuracy . The the actual diffuse reflected light intensity is not the ideal normal distribution , and the sampled signal , there are some other scattered light dot interference . Commonly used algorithm does not consider these , therefore , the accuracy of these algorithms are not satisfactory . Proposed a new algorithm , this algorithm makes the material away from the center point closer to the laser light weights .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser applications
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