doi:

DOI: 10.3724/SP.J.1249.2019.02207

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2019/36:2 PP.207-212

Identification of American ginseng by terahertz time domain spectroscopy combined with principal component analysis and linear discriminant analysis


Abstract:
Terahertz time-domain spectroscopy is a new spectroscopic measurement technique that has been widely applied in material detection due to its ability to penetrate most non-conducting and non-polar materials and its intrinsical safe nature. In this work, terahertz time-domain spectroscopy combined with principle component analysis and linear discriminant analysis was applied to establish a non-destructive identification model for American ginseng after extraction and authentic American ginseng. The spectral analysis was based on the terahertz spectra and the absorbance spectra of American ginseng after extraction and authentic American ginseng showed little difference. The leave-one-out approach was used to evaluate the performance of the principle component analysis and linear discriminant analysis model. The result of the analysis suggested that the reliabilities of the top three principal components were more than 98.1% and the recognition rates of the principle component analysis and linear discriminant analysis model were 100% and 96.7% in terms of the American ginseng after extraction and authentic American ginseng, and the total recognition rate was 98.3%. Our work suggests that by combining terahertz time-domain spectroscopy with principle component analysis and linear discriminant analysis, American ginseng after extraction and authentic American ginseng can be accurately distinguished and the identification results are reliable and practicable.

Key words:spectroscopy,terahertz time-domain spectroscopy,principal component analysis,linear discriminant analysis,American ginseng,identification

ReleaseDate:2019-12-02 09:24:39



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