To improve long-term repeatability in quantitative analysis of laser-induced breakdown spectroscopy (LIBS), a two-point standardization (TPS) method was used to perform a standard procedure on the measured intensities of test samples before quantitative analysis. Based on a self-developed LIBS analyzer, the TPS method was used to measure trace elements such as Mn, Si, Cr, Ni, Cu, Ti, Al, V and Mo in low alloy steel samples. Quantitative validations with six test samples were performed every 24 hours for three days. The results demonstrated that the instrument drift was effectively corrected using the TPS method, and the average relative errors (AREs) of repeated measurements decreased by 45%, 32%, 3%, 16%, 15%, 54%, 11%, 11%, and 91% for Mn, Si, Cr, Ni, Cu, Mo, Al, V, and Ti elements, respectively. The long-term repeatability of quantitative LIBS was improved using the TPS method. The performance of the TPS method for different elements is mainly influenced by the characteristics of test samples, correction samples, experimental conditions, etc. In practice, the TPS method is a very promising way to improve the repeatability of quantitative LIBS.

中文翻译：

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使用两点标准化方法提高定量LIBS的长期可重复性

为了提高激光诱导击穿光谱法（LIBS）定量分析中的长期可重复性，在定量分析之前，使用两点标准化（TPS）方法对测试样品的测量强度执行标准程序。基于自行开发的LIBS分析仪，TPS方法用于测量低合金钢样品中的痕量元素，例如Mn，Si，Cr，Ni，Cu，Ti，Al，V和Mo。每24小时进行6天的六个样品的定量验证，为期3天。结果表明，使用TPS方法可以有效地校正仪器漂移，重复测量的平均相对误差（ARE）降低了45％，32％，3％，16％，15％，54％，11％，11 Mn，Si，Cr，Ni，Cu，Mo，Al，V和Ti元素的含量分别为％和91％。使用TPS方法可以提高定量LIBS的长期可重复性。TPS方法对不同元素的性能主要受测试样品，校正样品，实验条件，等在实践中，TPS方法是提高定量LIBS的重复性一个非常有前途的方法。