Abstract An ultraviolet long-short double pulse laser-induced breakdown spectroscopy (UV LS-DP-LIBS) system is employed to detect the carbon element in solid and liquid steel samples. The important issues for the industrial application of LIBS are investigated in this work, which include the carbon excitation in steel, the influences of CO2, the quantitative analysis and the escape phenomenon of carbon. It is found that the CO2 in air can also be involved to the plasma generation and emits the carbon specific spectral lines. The strong emission line at C I 193.091 nm can be observed when the sample is placed in the gas atmosphere with CO2. It is also found that the carbon signal generated from liquid steel is continuously decreasing after the sample is molten. The experimental investigation demonstrates that the influences of O2 cause the carbon escape phenomenon in liquid steel, which should be fully considered for the industrial application of LIBS.

中文翻译：

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使用紫外长短双脉冲激光诱导击穿光谱法检测固体和液体钢样品中的碳

摘要 采用紫外长短双脉冲激光诱导击穿光谱(UV LS-DP-LIBS)系统对钢液固、液中的碳元素进行检测。本文研究了LIBS工业应用的重要问题，包括钢中的碳激发、CO2的影响、定量分析和碳的逸出现象。研究发现，空气中的CO2也参与等离子体的产生，并发射出碳特有的谱线。将样品置于含有 CO2 的气氛中时，可以观察到 CI 193.091 nm 处的强发射线。还发现样品熔化后钢液产生的碳信号不断降低。