CO_2激光焊接等离子体图像的三维重建  

Three-Dimensional Reconstruction of Plasma Image in CO_2 Laser Welding

作　　者：王永贵[1] 孙大为[1] 蔡艳[1] 朱俊杰[1] 吴毅雄[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海市激光制造与材料改性重点实验室,上海200240

出　　处：《上海交通大学学报》2014年第5期600-604,609,共6页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(51005152;51035004)

摘　　要：利用一组同步触发的高速相机获取CO2激光焊接过程中等离子体在多个方向的投影图像,采用质心投影法则对等离子体图像进行微调以提高空间匹配度,通过相机标定以及投影权重因子的计算,建立了等离子体的三维图像与二维图像之间的投影关系方程,并利用代数迭代法求解方程,获得了等离子体的三维亮度分布.结果表明:与二维等离子体图像相比,所提出的激光焊接等离子体图像的三维重建方法具有较高的重建精度,能够更加准确地描述对象的整体特征和内部信息.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 plas- ma much more accurately.

关 键 词：激光焊接 等离子体 三维重建 代数迭代法 

分 类 号：TG386.3[金属学及工艺—金属压力加工]