本文讨论了采用计算机处理激光焊接等离子体的高速摄影照片.等离子体面积计算采用象素,并以象素的个数来表示,给出了等离子面积分布的直方图;给出了基于灰度的等温线;分析了将激光焊接等离子体分为具有10个不同折射率的区域时对入射激光传输的影响,结果表明:等离子体使入射激光发散,呈现出负透镜效应,严重情况下甚至使焊接不能进行.

By means of computer, processing on photos of laser welding plasma taken by high-speed photography at 1000 frame frequency is discussed . The area of welding plasma is calculated by the use of pixel and expressed as quantity of pixels , then the diagram of picture number to plasma area is given out . The ithothermal line based on gray scale is drawn . The propagation affection of laser induced plasma to incident laser is analyzed when the induced plasma is divided into 10 regions with different refractive index, the results show the diverging of laser beam make the induced plasma like negative lens and even welding unable to proceed in sever condition.