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Performance of high-power lasers for rock excavation

机译：高功率激光器的岩石挖掘性能

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Rock excavation experiment with a 10kW-class CO$-2$/ laser was demonstrated as a basic study for field application of high power lasers. Sample rocks used in this experiment as a workpiece were tuff breccia and granite. Effect of assist gases on the excavation rate was surveyed. Oxygen, nitrogen, and air were examined and found not to be useful. It was because the gas flow could not blow the molten rocks off, but only helps to cool in case the hole races certain depth. Excavation rate on both rocks for a various output powers was measured to determine thermal constants inherent to each rock. It was found that the excavation rate resulted in slower, as the hole becomes deeper, because of the deterioration in evacuation efficiency of the molten rock. Thermal parameters of the both rocks were derived from the experimental results. Using simplified thermal balance model, it was estimated that a 50 kW-class mobile laser system has a potential to outperform the conventional mechanical excavation technique.
机译：岩石挖掘实验与10kW级CO $ -2 $ /激光的实验被证明是高功率激光器现场应用的基本研究。在本实验中使用的样本岩石作为工件是牙齿Breccia和花岗岩。调查了辅助气体对挖掘率的影响。检查氧气，氮气和空气，发现不具有有用的。这是因为气流不能吹掉熔融岩石，但只有有助于冷却，以便在孔比赛某种深度。测量各种输出功率的岩石上的挖掘率，以确定每个岩石固有的热常数。发现挖掘速率导致较慢的速度，因为孔变得更深，因为熔岩的抽空效率的劣化。两岩的热参数来自实验结果。使用简化的热平衡模型，据估计，50千瓦的移动激光系统具有优势优于传统的机械挖掘技术。

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