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16 February 2009 Classification of tea based on terahertz time domain spectroscopy
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Terahertz time-domain spectroscopy (THz-TDS) is a newly developed technique in the last decade. A new method to classify tea is proposed based on THz-TDS and pattern recognition method. Four kinds of tea are investigated to study its feasibility. Their absorption spectra are measured using the THz-TDS system. Then a pattern recognition method, support vector machine (SVM), is employed to differentiate the investigated tea based on their terahertz data. The absorption spectra between 0.2 and 2.0 THz of the investigated tea samples are selected as the feature to classify them. The correct rate of recognition for the SVM classifier is 96.88%. The results give evidence that different tea varieties can be distinguished based on their terahertz spectra. In this respect, the spectral method provides enough information to differentiate different kinds of tea.
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Binghua Cao, Guangxin Zhang, and Zekui Zhou "Classification of tea based on terahertz time domain spectroscopy", Proc. SPIE 7277, Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz Science and Technology, 727701 (16 February 2009);

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