高功率光纤激光焊金属蒸气图像辐射亮度的三维重建
发布时间：2018-08-27 12:50
【摘要】：以光纤传像束为基础搭建激光焊金属蒸气的多角度同步成像平台,从平台的3个方向获取金属蒸气的二维投影图像,并以二维投影图像为基础,采用基于中心投影模型的代数迭代法进行金属蒸气图像的三维重建,以获得金属蒸气图像辐射亮度的三维分布.结果表明:对于高功率激光焊接而言,金属蒸气图像的辐射亮度呈现出由内到外而逐渐降低的变化趋势,其中心部分的辐射亮度分布并不连续,且存在相对孤立的离散区域;当匙孔的开口与激光入射点重合时,金属蒸气的尺寸较小且贴近于工件表面;当熔池波动而造成匙孔失稳时,金属蒸气图像出现了形态异常和较为显著的尺寸变化.
[Abstract]:A multi-angle synchronous imaging platform for laser welding metal vapor was built based on optical fiber image transfer beam. The two-dimensional projection image of metal vapor was obtained from three directions of the platform and based on two-dimensional projection image. An algebraic iterative method based on the central projection model is used to reconstruct the metal vapor image in order to obtain the three dimensional distribution of the radiance of the metal vapor image. The results show that for high power laser welding, the radiance of metal vapor image decreases gradually from inside to outside, the radiance distribution in the center of the image is not continuous, and there are relatively isolated discrete regions. When the opening of the keyhole coincides with the laser incident point, the size of the metal vapor is smaller and closer to the surface of the workpiece, and when the key hole is unstable due to the fluctuation of the molten pool, the metal vapor image shows abnormal shape and obvious size change.
【作者单位】： 上海交通大学上海市激光制造与材料改性重点实验室;上海交通大学高新船舶与深海开发装备协同创新中心;
【基金】：国家自然科学基金项目(51475297) 上海市科学技术委员会项目(14DZ1200400)资助
【分类号】：TG456.7
[Abstract]:A multi-angle synchronous imaging platform for laser welding metal vapor was built based on optical fiber image transfer beam. The two-dimensional projection image of metal vapor was obtained from three directions of the platform and based on two-dimensional projection image. An algebraic iterative method based on the central projection model is used to reconstruct the metal vapor image in order to obtain the three dimensional distribution of the radiance of the metal vapor image. The results show that for high power laser welding, the radiance of metal vapor image decreases gradually from inside to outside, the radiance distribution in the center of the image is not continuous, and there are relatively isolated discrete regions. When the opening of the keyhole coincides with the laser incident point, the size of the metal vapor is smaller and closer to the surface of the workpiece, and when the key hole is unstable due to the fluctuation of the molten pool, the metal vapor image shows abnormal shape and obvious size change.
【作者单位】： 上海交通大学上海市激光制造与材料改性重点实验室;上海交通大学高新船舶与深海开发装备协同创新中心;
【基金】：国家自然科学基金项目(51475297) 上海市科学技术委员会项目(14DZ1200400)资助
【分类号】：TG456.7
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