黄铜样品定量分析的免校准方法

Vikas Gupta, Abhishekh Kumar Rai, Tejmani Kumar, Akash Kumar Tarai, Manoj Kumar Gundawar, A. K. Rai
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摘要

免校准激光诱导击穿光谱(CF-LIBS)被成功地用于利用 LIBS 技术测定黄铜样品的化学成分。使用脉宽为 5 ns 的 Q 开关 Nd: YAG 激光照射样品,在样品表面产生激光诱导等离子体 (LIP)。仅从黄铜样品表面记录时间演化光谱,累计五次激光照射获得一次 LIP 光谱。时间分辨 LIP 光谱被用来确定最适合 CF-LIBS 实施的时间窗口(等离子体光学稀薄且处于局部热平衡状态)。本研究还利用上述激光对金属黄铜样品进行了定量烧蚀。为了从 LIP 中获得确切的定量信息,本文分析了等离子体的特征,即光谱线强度、光谱线展宽、电子数密度和等离子体温度。根据两种不同的 CF-LIBS 算法,确定了黄铜样品的成分,发现与认证结果十分吻合。本文还比较和对比了这两种策略,并讨论了它们的地位和重要性。本手稿的结果说明了 CF-LIBS 在精确测定黄铜成分方面的潜在适用性。
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Calibration-free approaches for quantitative analysis of a brass sample
Calibration-free laser-induced breakdown spectroscopy (CF-LIBS) is successfully employed to determine the chemical composition of brass samples using the LIBS technique. The sample is irradiated with a Q-switched Nd: YAG laser with a pulse width of 5 ns to generate laser-induced plasma (LIP) on the sample surface. The time evolution spectra were recorded from the surface of the brass sample only with an accumulation of five laser shots to get one LIP spectrum. Time-resolved LIP spectra have been utilized to identify the most appropriate time window (where the plasma is optically thin and in local thermal equilibrium) suitable for CF-LIBS implementation. Stoichiometric ablation is also demonstrated for metallic brass samples with the aforementioned laser in the present study. To obtain definitive quantitative information from LIP, the characterization of the plasma, i.e., spectral line intensity, spectral line broadening, electron number density, and plasma temperature, has been analyzed in this paper. Based on two different CF-LIBS algorithms, the brass sample composition was determined and found to be in good agreement with the certified results. This paper also compares and contrasts both strategies, as well as discusses their place and importance. The results of the present manuscript illustrate the potential applicability of CF-LIBS for yielding precise and accurate compositions of brass.
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