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Terahertz time-domain spectroscopy provides a new method of identifying and studying Chinese herbal medicines. We utilize a second-order terahertz filter to describe the samples of Chinese herbal medicines, and the behaviors of terahertz filter are characterized by a second-order differential equations with three parameters {α, β, γ} or the corresponding frequency domain system function H(f). The results of data analysis show that five kinds of Chinese herbal medicines which are used in the experiments have unique filter parameters. Thus, if these filter parameters are used as the fingerprint data of Chinese herbal medicines, we can effectively determine the types and origins of Chinese herbal medicines.
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Keywords:
- second order damped oscillator /
- terahertz electromagnetic low-pass filter /
- Chinese herbal medicines fingerprint data
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[2] Si L M, Hou J X, Liu Y, L X 2013 Acta Phys. Sin. 62 037806 (in Chinese) [司黎明, 侯吉旋, 刘埇, 吕昕 2013 62 037806]
[3] Li Z Y, Bing P B, Xu D G, Cao X L, Yao J Q 2013 Acta Phys. Sin. 62 084212 (in Chinese) [李忠洋, 邴丕彬, 徐德刚, 曹小龙, 姚建铨 2013 62 084212]
[4] Yuan C, Xu S L, Yao J Q, Zhao X L, Cao X L, Wu L 2014 Chin. Phys. B 23 018102
[5] Zheng X R, Cheng F, Wu J B, Jin B B, Zhu B Y 2014 Chin. Phys. B 23 014101
[6] Yang Y P, Dong R L, Zhang Z W 2012 Spectrosc. Spectr. Anal. 32 3035 (in Chinese) [杨玉平, 董睿林, 张振伟 2012 光谱学与光谱分析 32 3035]
[7] He M X, Guo S, Qin R, Liu J Z 2013 Chin. J. Spectros. Lab. 30 1044 (in Chinese) [何明霞, 郭帅, 秦蕊, 刘嘉政 2013 光谱实验室 30 1044]
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[9] Liu X H, Shi Q W, Zhang J, Feng X J, Liu X J, Huang W X 2009 Chinese Traditional and Herbal Drugs 40 1508 (in Chinese) [刘兴豪, 施奇武, 张建, 冯修军, 刘小杰, 黄婉霞 2009 中草药 40 1508]
[10] Li J 2012 Ph. D. Dissertation (Xi'an: Xidian University) (in Chinese) [李静 2012 博士学位论文(西安: 西安电子科技大学)]
[11] Long S M, Zhu J W, Sun Y Q, Yin J W, Ran Q W 2002 Mathematics Physics Methods & Mathematica (Xi'an: Shanxi People Education Press) pp343-421 (in Chinese) [龙姝明, 朱杰武, 孙彦清, 尹继武, 冉启武 2002 数学物理方法 & Mathematica (西安: 陕西人民教育出版社)第343–421页]
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[1] Zhang X C, Xu J Z 2009 Introduction to THz Wave Photonics (New York: Springer-Verlag Inc.) p222
[2] Si L M, Hou J X, Liu Y, L X 2013 Acta Phys. Sin. 62 037806 (in Chinese) [司黎明, 侯吉旋, 刘埇, 吕昕 2013 62 037806]
[3] Li Z Y, Bing P B, Xu D G, Cao X L, Yao J Q 2013 Acta Phys. Sin. 62 084212 (in Chinese) [李忠洋, 邴丕彬, 徐德刚, 曹小龙, 姚建铨 2013 62 084212]
[4] Yuan C, Xu S L, Yao J Q, Zhao X L, Cao X L, Wu L 2014 Chin. Phys. B 23 018102
[5] Zheng X R, Cheng F, Wu J B, Jin B B, Zhu B Y 2014 Chin. Phys. B 23 014101
[6] Yang Y P, Dong R L, Zhang Z W 2012 Spectrosc. Spectr. Anal. 32 3035 (in Chinese) [杨玉平, 董睿林, 张振伟 2012 光谱学与光谱分析 32 3035]
[7] He M X, Guo S, Qin R, Liu J Z 2013 Chin. J. Spectros. Lab. 30 1044 (in Chinese) [何明霞, 郭帅, 秦蕊, 刘嘉政 2013 光谱实验室 30 1044]
[8] Liu Y S, Cao M, Wang Y M, Luo G A 2006 Chin. J. Anal. Chem. 34 333 (in Chinese) [刘永锁, 曹敏, 王义明, 罗国安 2006 分析化学 34 333]
[9] Liu X H, Shi Q W, Zhang J, Feng X J, Liu X J, Huang W X 2009 Chinese Traditional and Herbal Drugs 40 1508 (in Chinese) [刘兴豪, 施奇武, 张建, 冯修军, 刘小杰, 黄婉霞 2009 中草药 40 1508]
[10] Li J 2012 Ph. D. Dissertation (Xi'an: Xidian University) (in Chinese) [李静 2012 博士学位论文(西安: 西安电子科技大学)]
[11] Long S M, Zhu J W, Sun Y Q, Yin J W, Ran Q W 2002 Mathematics Physics Methods & Mathematica (Xi'an: Shanxi People Education Press) pp343-421 (in Chinese) [龙姝明, 朱杰武, 孙彦清, 尹继武, 冉启武 2002 数学物理方法 & Mathematica (西安: 陕西人民教育出版社)第343–421页]
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