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首页> 外文期刊>Journal of Analytical Atomic Spectrometry >Comparative study of two standard-free approaches in laser-induced breakdown spectroscopy as applied to the quantitative analysis of aluminum alloy standards under vacuum conditions
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Comparative study of two standard-free approaches in laser-induced breakdown spectroscopy as applied to the quantitative analysis of aluminum alloy standards under vacuum conditions

机译：两种激光诱导击穿光谱中无标样方法的比较研究，用于真空条件下铝合金标样的定量分析

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Two standard free approaches to the quantitative analysis of aluminum alloys by laser-induced breakdown spectroscopy (LIBS) are compared-the calibration-free LIBS (CF-L1BS) approach and the Monte Carlo simulated annealing optimization method (MC-LIBS). The experiments are carried out under a pressure of 0.1 mbar, using a Nd-YAG at 1064 nm, with a 5.3 ns nominal pulse width, an energy of 90 mJ/pulse and a spot size on the target of 0.070 cm, resulting in an irradiance of 4.4 GW/cm~2. The spectra are taken with a grating monochromator calibrated over a wide spectral range and equipped with an intensified CCD detector. A gate width of 100 ns has been chosen for the measurements. In the MC model, a direct-inverse approach is used, where simulated and experimental spectra are correlated with each other until a satisfactory correlation coefficient is obtained. Spatially resolved measurements are also performed, by recording the plasma emission in the imaging mode and binning the resulting image into 11 different spatial positions along the axial direction, each binned region being equivalent to ～ 0.025 cm portion of the vertical plasma partition. The spectrum obtained for each spatial position is still spatially integrated along the line-of-sight. Comparatively, concentration values obtained with CF-LIBS for the matrix element Al are much closer to the certified values than those obtained with MC-LIBS (4% versus 20% relative errors, respectively), while the relative concentration obtained for the remainder of the sample components resulted in relative errors that are comparable in magnitude with both approaches (30%-250% relative errors). It is argued that the necessity of improving the space and time resolution of the experimental set-up appears to be at least as important as that of refining the theoretical models.
机译：比较了两种通过激光诱导击穿光谱法（LIBS）对铝合金进行定量分析的无标准方法，即无标定LIBS（CF-L1BS）方法和蒙特卡洛模拟退火优化方法（MC-LIBS）。实验是在0.1 mbar的压力下，使用1064 nm的Nd-YAG，标称脉冲宽度为5.3 ns，能量为90 mJ /脉冲，目标上的光斑大小为0.070 cm进行的，辐照度为4.4 GW / cm〜2。使用在宽光谱范围内校准并配备增强型CCD检测器的光栅单色仪获取光谱。选择了100 ns的栅极宽度进行测量。在MC模型中，使用直接逆方法，其中将模拟光谱和实验光谱相互关联，直到获得令人满意的相关系数为止。通过在成像模式下记录等离子体发射并将结果图像沿轴向合并到11个不同的空间位置中，还可以进行空间分辨的测量，每个合并的区域都相当于垂直等离子体分区的〜0.025 cm部分。从每个空间位置获得的光谱仍沿视线在空间上积分。相比之下，用CF-LIBS获得的基质元素A1的浓度值要比用MC-LIBS获得的浓度值更接近标准值（相对误差分别为4％和20％），而其余部分获得的相对浓度。样本分量导致的相对误差在两种方法上的大小可比（30％-250％相对误差）。有人认为，改善实验装置的时空分辨率至少与完善理论模型同样重要。

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