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Performance of high-power lasers for rock excavation

机译：大功率激光器在岩石开挖中的性能

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Abstract: 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. !14
机译：摘要：演示了用10kW级CO $ -2 $ /激光器进行岩石开挖实验，作为大功率激光器现场应用的基础研究。在该实验中用作工件的样品岩石为凝灰岩角砾岩和花岗岩。调查了辅助气体对开挖速率的影响。检查了氧气，氮气和空气，发现没有用。这是因为气流无法将熔融的岩石吹走，而只能在井孔达到一定深度时帮助冷却。测量了两种岩石在不同输出功率下的开挖速率，以确定每种岩石固有的热常数。可以发现，由于熔融岩石的疏散效率的降低，随着孔的变深，开挖速度变慢。两种岩石的热学参数均来自实验结果。使用简化的热平衡模型，可以估算出50 kW级的移动激光系统具有超越传统机械挖掘技术的潜力。 ！14

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