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《Journal of Shanghai Jiaotong University》 2014-05
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Three-Dimensional Reconstruction of Plasma Image in CO_2 Laser Welding

WANG Yong-gui;SUN Da-wei;CAI Yan;ZHU Jun-jie;WU Yi-xiong;School of Materials Science and Engineering,Shanghai Key Laboratory of Materials Laser Processing and Modification,Shanghai Jiaotong University;  
A set of high-speed cameras were used to obtain the plasma image in different directions in the process of CO2laser welding.The centroid projecting principle was employed to adjust the plasma images in different directions.The projection relationship between the 3Dplasma and 2Dimages were achieved by camera calibration and calculation of projection weighting factors.Finally,the 3Dradiation distribution of plasma was obtained based on algebraic reconstruction technology(ART).The result shows that the 3D reconstruction of laser-induced plasma has a high reconstruction accuracy.And compared with 2Dplasma image,the 3Dreconstructed data reflects the dimensional characteristics and inner information of the plasma much more accurately.
【Fund】: 国家自然科学基金资助项目(51005152 51035004)
【CateGory Index】: TP391.41;TN249
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