Plasma through the plane to medium vision with massive particles through path minkowski space plane path of the mathematical description of consistent, contain the space and time dimension.
等离子通过异向介质的平面路径与大规模粒子通过闵可夫斯基空间的平面路径的数学描述一致，其中都包含了空间和时间的维度。
Using low cost charge coupled device (CCD), a vision sensing equipment in welding process was made, and a real time plasma arc welding (PAW) seam tracking system was implemented.
采用低成本电荷耦合器件制作了焊接过程视觉传感器，实现了一种等离子弧焊焊缝实时跟踪系统。
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