Laser Laboratory and Environment, Department of Analytical Chemistry, Faculty of Sciences, University of Zaragoza, Pedro Cerbuna #12, 50009 Zaragoza, Spain.
J Hazard Mater. 2011 Aug 30;192(2):704-13. doi: 10.1016/j.jhazmat.2011.05.074. Epub 2011 Jun 12.
The methods of linear and rank correlation and normalized coordinates (MNC) have been applied to the identification of organic solid materials with a very similar chemical composition by laser-induced breakdown spectroscopy (LIBS). The present study evaluated these three statistical methods using an Echelle spectrometer coupled with an intensified charge-coupled device (ICCD). Moreover, three instrumental parameters (laser pulse energy, delay time and integration time) were evaluated in terms of their influence on the signal-to-noise ratio of carbon and hydrogen emission lines. The probability of a right identification can be estimated by means the described methods in this paper. Methods of correlation provide better identification and discrimination than normalized coordinates at a 95% confidence level.
线性和秩相关方法以及标准化坐标（MNC）已应用于通过激光诱导击穿光谱（LIBS）识别具有非常相似化学成分的有机固体材料。本研究使用带有增强电荷耦合器件（ICCD）的阶梯式光谱仪评估了这三种统计方法。此外，还评估了三个仪器参数（激光脉冲能量、延迟时间和积分时间）对碳和氢发射线信噪比的影响。通过本文所述方法可以估计正确识别的概率。在 95%置信水平下，相关方法比标准化坐标提供了更好的识别和区分能力。
