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首页> 外文期刊>Applied optics >Laser-induced breakdown spectroscopy of alkali metals in high-temperature gas
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Laser-induced breakdown spectroscopy of alkali metals in high-temperature gas

机译：高温气体中碱金属的激光诱导击穿光谱

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Laser-induced breakdown spectroscopy (LIBS) measurements of alkali in the high-temperature exhaust of a glass furnace show an attenuation of the Na and K LIBS signals that correlates with the stoichiometry of the bath gas surrounding the spark. The results are explained as being due to (1) a strong increase in the concentration of atomic Na and K, resulting in neutral line signal absorption by these atoms, and to (2) a change of phase of the major Na- and K-containing species from an aerosol to a gaseous phase when the gas mixture becomes fuel rich, resulting in a reduced LIBS emission intensity. LIBS sampling at lower temperatures, or in a consistently oxidizing environment, or both are suggested strategies for circumventing these difficulties.
机译：玻璃炉高温排气中碱的激光诱导击穿光谱（LIBS）测量显示，Na和K LIBS信号的衰减与围绕火花的熔池气体的化学计量有关。解释该结果是由于（1）原子Na和K的浓度大大增加，导致这些原子吸收了中性线信号，以及（2）主要Na-和K-的相变。当气体混合物变得富含燃料时，会从气溶胶到气相中包含各种物质，导致LIBS排放强度降低。建议在较低温度下或在持续氧化的环境下（或同时在两者下）进行LIBS采样来规避这些困难。

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