LIBS技术在检测炉渣中的最佳实验参数的研究

Research on the optimal experimental parameters for detecting slag based on LIBS

激光诱导等离子体受激光能量大小、激光聚焦位置、采集延时等实验参数的影响,这些因素变动直接影响物质成分定量分析的准确性。搭建激光诱导击穿光谱实验平台,主要研究了激光诱导击穿光谱技术在对炉渣进行检测时的最佳聚焦位置和最佳收集位置。以CaI:428.28nm和CaII:393.37nm为研究对象,观察了聚焦透镜与样品之间距离与激光作用在样品上的光谱信号强度之间的关系。以CaI:428.28nm和SiI:252.91nm为研究对象,观察了观测位置与聚焦点样品表面之间距离与激光作用在样品上的光谱信号强度之间的关系。结果表明,聚焦位置和收集位置到样品表面的距离不同,光谱信号强度也会发生变化,聚焦位置在炉渣样品表面以下2~3mm光谱信号强度最好,收集位置在聚焦位置表面以上1~2mm时,光谱信号强度最好。

Laser-induced plasma is affected by experimental parameters such as laser energy size,laser focus position,and acquisition delay.These factors directly affect the accuracy of quantitative analysis of material components.In this paper,a laser induced breakdown spectroscopy experimental platform was built,and the best focus position and optimal collection position of the laser induced breakdown spectroscopy technique in detecting slag were studied.Taking CaI:428.28nm and CaII:393.37nm as the research objects,the relationship between the distance between the focusing lens and the sample,and the intensity of the spectral signal of the laser on the sample was observed.Taking CaI:428.28nm and SiI:252.91nm as the research objects,the relationship between the distance between the observation position and the surface of the focused spot sample,and the intensity of the spectral signal of the laser on the sample was observed.The results show that the intensity of the spectral signal changes when the focus position and the collection position are different from the surface of the sample.When the intensity of the spectral signal is 2-3mm below the surface of the slag sample,the observation position is 1-2mm above the surface of the focus position,the spectral signal intensity is the best.