2D evaluation of spectral LIBS data derived from heterogeneous materials using cluster algorithm
Laser-induced Breakdown Spectroscopy (LIBS) is capable of providing spatially resolved element maps in regard to the chemical composition of the sample. The evaluation of heterogeneous materials is often a challenging task, especially in the case of phase boundaries. In order to determine informatio...
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| Veröffentlicht in: | Spectrochimica acta. Part B: Atomic spectroscopy Jg. 134; S. 58 - 68 |
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| Sprache: | Englisch |
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01.08.2017
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| ISSN: | 0584-8547, 1873-3565 |
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| Abstract | Laser-induced Breakdown Spectroscopy (LIBS) is capable of providing spatially resolved element maps in regard to the chemical composition of the sample. The evaluation of heterogeneous materials is often a challenging task, especially in the case of phase boundaries. In order to determine information about a certain phase of a material, the need for a method that offers an objective evaluation is necessary. This paper will introduce a cluster algorithm in the case of heterogeneous building materials (concrete) to separate the spectral information of non-relevant aggregates and cement matrix. In civil engineering, the information about the quantitative ingress of harmful species like Cl−, Na+ and SO42− is of great interest in the evaluation of the remaining lifetime of structures (Millar et al., 2015; Wilsch et al., 2005). These species trigger different damage processes such as the alkali-silica reaction (ASR) or the chloride-induced corrosion of the reinforcement. Therefore, a discrimination between the different phases, mainly cement matrix and aggregates, is highly important (Weritz et al., 2006). For the 2D evaluation, the expectation-maximization-algorithm (EM algorithm; Ester and Sander, 2000) has been tested for the application presented in this work. The method has been introduced and different figures of merit have been presented according to recommendations given in Haddad et al. (2014). Advantages of this method will be highlighted. After phase separation, non-relevant information can be excluded and only the wanted phase displayed. Using a set of samples with known and unknown composition, the EM-clustering method has been validated regarding to Gustavo González and Ángeles Herrador (2007).
•Laser-induced breakdown spectroscopy for spatial resolved element distributions•Multivariate evaluation of heterogeneous materials•Expectation-maximization (EM) algorithm for clustering•Automated and objective phase separation•Heterogeneity of concrete as an example |
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| AbstractList | Laser-induced Breakdown Spectroscopy (LIBS) is capable of providing spatially resolved element maps in regard to the chemical composition of the sample. The evaluation of heterogeneous materials is often a challenging task, especially in the case of phase boundaries. In order to determine information about a certain phase of a material, the need for a method that offers an objective evaluation is necessary. This paper will introduce a cluster algorithm in the case of heterogeneous building materials (concrete) to separate the spectral information of non-relevant aggregates and cement matrix. In civil engineering, the information about the quantitative ingress of harmful species like Cl−, Na+ and SO42− is of great interest in the evaluation of the remaining lifetime of structures (Millar et al., 2015; Wilsch et al., 2005). These species trigger different damage processes such as the alkali-silica reaction (ASR) or the chloride-induced corrosion of the reinforcement. Therefore, a discrimination between the different phases, mainly cement matrix and aggregates, is highly important (Weritz et al., 2006). For the 2D evaluation, the expectation-maximization-algorithm (EM algorithm; Ester and Sander, 2000) has been tested for the application presented in this work. The method has been introduced and different figures of merit have been presented according to recommendations given in Haddad et al. (2014). Advantages of this method will be highlighted. After phase separation, non-relevant information can be excluded and only the wanted phase displayed. Using a set of samples with known and unknown composition, the EM-clustering method has been validated regarding to Gustavo González and Ángeles Herrador (2007).
•Laser-induced breakdown spectroscopy for spatial resolved element distributions•Multivariate evaluation of heterogeneous materials•Expectation-maximization (EM) algorithm for clustering•Automated and objective phase separation•Heterogeneity of concrete as an example |
| Author | Gottlieb, C. Wilsch, G. Grothe, S. Millar, S. |
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| Cites_doi | 10.1039/C6JA00253F 10.1002/best.201500030 10.1007/s00216-006-0362-0 10.1366/0003702981942654 10.1016/j.sab.2009.07.021 10.1063/1.3592085 10.1111/j.2517-6161.1977.tb01600.x 10.1016/j.trac.2007.01.009 10.1016/j.sab.2015.10.008 10.1016/j.nimb.2010.10.006 10.1016/j.sab.2014.08.039 10.1007/BF02662393 10.1016/S0963-8695(98)00008-5 10.1561/2000000034 10.1016/j.conbuildmat.2005.06.001 10.1016/S0584-8547(01)00387-1 10.1016/j.sab.2014.06.021 10.1021/ac9703111 |
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| Title | 2D evaluation of spectral LIBS data derived from heterogeneous materials using cluster algorithm |
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