The geometry of the cutting front and the cutting kerf was measured with an online high-speed x-ray diagnostic system. X-ray videos from fusion cutting of 10 mm thick stainless steel samples were recorded with a frame rate of 1000 Hz. A three-dimensional reconstruction of the time-averaged geometry of the cutting front and cutting kerf out of these images made it possible to apply ray-tracing for calculating the overall absorptance and the distribution of the absorbed irradiance at the cutting front. When increasing the feed rate, it was observed that the local inclination of the lower part of the cutting front with respect to the laser beam increased as well as the locally absorbed irradiance on the cutting front. This also leads to an increase in the overall absorptance with increasing feed rates.

中文翻译：

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激光束切割过程中切割前沿的几何形状和吸收率

使用在线高速 X 射线诊断系统测量切割前沿和切割切口的几何形状。以 1000 Hz 的帧频记录来自 10 毫米厚不锈钢样品熔切的 X 射线视频。从这些图像中对切割前沿和切割切口的时间平均几何形状进行三维重建，可以应用光线追踪来计算切割前沿的总吸收率和吸收辐照度的分布。当增加进给速度时，观察到切割前沿下部相对于激光束的局部倾斜度增加以及切割前沿上局部吸收的辐照度增加。这也导致总吸收率随着进料速率的增加而增加。