期刊
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
卷 64, 期 10, 页码 1009-1019出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.sab.2009.07.005
关键词
Laser-induced; breakdown spectroscopy; Chemical signatures; Geomaterial classification; Multivariate analysis
类别
A large suite of natural carbonate, fluorite and silicate geological materials was studied using laser-induced breakdown spectroscopy (LIBS). Both single- and double-pulse LIBS spectra were acquired using close-contact benchtop and standoff (25 m) LIBS systems. Principal components analysis (PCA) and partial least squares discriminant analysis (PLS-DA) were used to identify the distinguishing characteristics of the geological samples and to classify the materials. Excellent discrimination was achieved with all sample types using PLS-DA and several techniques for improving sample classification were identified. The laboratory double-pulse LIBS system did not provide any advantage for sample classification over the single-pulse LIBS system, except in the case of the soil samples. The standoff LIBS system provided comparable results to the laboratory systems. This work also demonstrates how PCA can be used to identify spectral differences between similar sample types based on minor impurities. Published by Elsevier B.V
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