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Optical Engineering • Open Access

Accuracy improvement in laser stripe extraction for large-scale triangulation scanning measurement system
Author(s): Yang Zhang; Wei Liu; Xiaodong Li; Fan Yang; Peng Gao; Zhenyuan Jia

Paper Abstract

Large-scale triangulation scanning measurement systems are widely used to measure the three-dimensional profile of large-scale components and parts. The accuracy and speed of the laser stripe center extraction are essential for guaranteeing the accuracy and efficiency of the measuring system. However, in the process of large-scale measurement, multiple factors can cause deviation of the laser stripe center, including the spatial light intensity distribution, material reflectivity characteristics, and spatial transmission characteristics. A center extraction method is proposed for improving the accuracy of the laser stripe center extraction based on image evaluation of Gaussian fitting structural similarity and analysis of the multiple source factors. First, according to the features of the gray distribution of the laser stripe, evaluation of the Gaussian fitting structural similarity is estimated to provide a threshold value for center compensation. Then using the relationships between the gray distribution of the laser stripe and the multiple source factors, a compensation method of center extraction is presented. Finally, measurement experiments for a large-scale aviation composite component are carried out. The experimental results for this specific implementation verify the feasibility of the proposed center extraction method and the improved accuracy for large-scale triangulation scanning measurements.

Paper Details

Date Published: 15 October 2015
PDF: 11 pages
Opt. Eng. 54(10) 105108 doi: 10.1117/1.OE.54.10.105108
Published in: Optical Engineering Volume 54, Issue 10
Show Author Affiliations
Yang Zhang, Dalian Univ. of Technology (China)
Wei Liu, Dalian Univ. of Technology (China)
Xiaodong Li, Dalian Univ. of Technology (China)
Fan Yang, Dalian Univ. of Technology (China)
Peng Gao, Dalian Univ. of Technology (China)
Zhenyuan Jia, Dalian Univ. of Technology (China)

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