Chinese Journal of Lasers, Volume. 36, Issue 3, 752(2009)

Identification of Terahertz Absorption Spectra of Illicit Drugs Using Support Vector Machines

Zhao Shusen, Chen Sijia, and Shen Jingling*
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    On the base of absorption spectra in the range of 0.2~2 THz of nine illicit drugs and three mixed drugs obtained by using terahertz time-domain spectroscopy (THz-TDS) technique, the THz absorption spectra of different illicit drugs and mixed drugs were identified by support vector machines (SVM). Absorption spectra of the nine illicit drugs and flour, which were pretreated by normalized unit, were used to train libsvm program. Absorption spectra of the illicit drugs and the mixed drugs which were measured at different time and pretreated by normalized unit too, were identified by the libsvm and the identification rate was 100%. The results indicate that it is feasible to apply SVM to identification of illicit drugs, which provides an effective method in the secure inspection and identification for illicit drugs.

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    Zhao Shusen, Chen Sijia, Shen Jingling. Identification of Terahertz Absorption Spectra of Illicit Drugs Using Support Vector Machines[J]. Chinese Journal of Lasers, 2009, 36(3): 752

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    Paper Information

    Category: measurement and metrology

    Received: Apr. 28, 2008

    Accepted: --

    Published Online: Mar. 17, 2009

    The Author Email: Jingling Shen (sjl-phy@mail.cnu.edu.cn)

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