Abstract Calibration-free (CF) method combined with high repetition rate laser-ablation spark-induced breakdown spectroscopy (HRR LA-SIBS) was first utilized to realize elemental analysis of alloy samples. A compact fiber laser operated at 30 kHz pulse repetition rate was used to ablate the sample and the spectra were recorded with a compact fiber spectrometer in non-gated signal recording mode. Three standard aluminum alloy samples were analyzed to evaluate the performance of this technique. Median filtering method was applied to reduce the contribution of the continuum background to the intensity of the atomic lines. The averaged electron density was determined to be (2.36–2.49) × 1017 cm−3 according to the Stark broadening of four ionic lines. 11,800 K averaged plasma temperature was estimated from the Saha-Boltzmann plots. The plasma could be verified to be in a state close to local thermodynamic equilibrium. The analytical error was 0.1% concentrations. It was demonstrated that CF method combined with HRR LA-SIBS was possible to realize reliable quantitative elemental analysis for aluminum alloy samples.

中文翻译：

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免校准元素分析结合高重复率激光烧蚀火花诱导击穿光谱

摘要 首次利用免校准（CF）法结合高重复率激光烧蚀火花诱导击穿光谱（HRR LA-SIBS）实现合金样品的元素分析。使用以 30 kHz 脉冲重复率运行的紧凑型光纤激光器烧蚀样品，并使用紧凑型光纤光谱仪以非门控信号记录模式记录光谱。分析了三个标准铝合金样品以评估该技术的性能。应用中值滤波方法来减少连续谱背景对原子线强度的贡献。根据四个离子线的斯塔克展宽，平均电子密度确定为 (2.36–2.49) × 1017 cm-3。根据 Saha-Boltzmann 图估计 11,800 K 平均等离子体温度。可以验证等离子体处于接近局部热力学平衡的状态。分析误差为 0.1% 浓度。结果表明，CF方法结合HRR LA-SIBS可以实现铝合金样品可靠的定量元素分析。