Three-Dimensional Reconstruction of Plasma Image in CO2 Laser Welding

Abstract

Abstract:

A set of high-speed cameras were used to obtain the plasma image in different directions in the process of CO2 laser welding. The centroid projecting principle was employed to adjust the plasma images in different directions. The projection relationship between the 3D plasma and 2D images were achieved by camera calibration and calculation of projection weighting factors. Finally, the 3D radiation 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 2D plasma image, the 3D reconstructed data reflects the dimensional characteristics and inner information of the plasma much more accurately.

Key words: laser welding, plasma, three-dimensional reconstruction, algebraic reconstruction technique (ART)

CLC Number:

TG 386.3

WANG Yonggui,SUN Dawei,CAI Yan,ZHU Junjie,WU Yixiong. Three-Dimensional Reconstruction of Plasma Image in CO2 Laser Welding[J]. Journal of Shanghai Jiaotong University, 2014, 48(05): 600-604.

References

［1］Wang C M, Meng X X, Huang W, et al. Role of side assisting gas on plasma and energy transmission during CO2 laser welding ［J］. Journal of Materials Processing Technology, 2011, 211(4): 668674.

［2］You D, Gao X. Monitoring of high power laser welding process by using image difference algorithm ［C］ ∥Proceedings of the World Congress on Engineering and Computer Science. San Francisco, USA: WCECS, 2012: 1.

［3］Sony G, Nampoori V P N. Application of imaging to study the evolution and dynamics of laser produced plasma from solid and thin film Li targets ［D］. Cochin, Kerala: Cochin University of Science and Technology, 2011.

［4］You D Y, Gao X D. Study of plume behavior during highpower disk laser welding ［J］. Applied Mechanics and Materials, 2012, 201: 10761079.

［5］Wang J, Wang C, Meng X, et al. Study on the periodic oscillation of plasma/vapor induced during high power fiber laser penetration welding ［J］. Optics and Laser Technology, 2012, 44(1): 6770.

［6］Teng W, Gao X D, Seiji K. Analysis of laserinduced plume during disk laser welding at different speeds ［J］. Plasma Science and Technology, 2013, 15(8): 821.

［7］Li G, Cai Y, Wu Y. Stability information in plasma image of highpower CO2 laser welding ［J］. Optics and Lasers in Engineering, 2009, 47(9): 990994.

［8］Abe N, Kunugita Y, Hayashi M, et al. Dynamic observation of high speed laserarc combination welding of thick steel plates (physics, processes, instruments and measurements) ［J］. Transactions of JWRI, 1997, 26(2): 711.

［9］赵英亮. 三维结构特征CT重建算法研究［D］. 太原: 中北大学信息与通信工程学院, 2010.

［10］Zhang Z Y. A flexible new technique for camera calibration ［J］. IEEE Transactions on Pattern Analysis and Machine Intelligence, 2000, 22(11): 13301334.

［11］JeanYves Bouguet. Camera calibration toolbox for matlab ［CP/OL］. (20101202) ［20131010］. http:∥ www.vision.caltech.edu/bouguetj/calib_doc/.

［12］杨民, 路宏年, 孔凡琴, 等. 三维CT重建几何参数的非线性最小二乘估计［J］. 北京航空航天大学学报, 2005, 31(10): 11351139.

YANG Min, LU Hongnian, KONG Fanqin，et al. An estimation of parameters in threedimensional CT reconstruction using nonlinear least square method ［J］. Journal of Beihang University, 2005, 31(10): 11351139.

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