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Laser & Optoelectronics Progress, Volume. 58, Issue 22, 2200002(2021)

Identification of Four Origins of Curcuma Based on Terahertz Time-Domain Spectroscopy

Jinqiu Rao1,2, Liyi Chen1,2, Pengpeng Bai1,2, Tingting Zhang1,2, Qiduo Zhao1、*, and Feng Qiu1,2、**
Author Affiliations
  • 1School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
  • 2State Key Laboratory of Component-Based Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (10)
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    References (31)
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    Figures & Tables(10)
    Schematic of THz-TDS

    Fig. 1. Schematic of THz-TDS

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    Appearance of Curcuma. (a) Curcuma Wenyujin; (b) Curcuma longa; (c) Curcuma kwangsiensis; (d) Curcuma phaeocaulis

    Fig. 2. Appearance of Curcuma. (a) Curcuma Wenyujin; (b) Curcuma longa; (c) Curcuma kwangsiensis; (d) Curcuma phaeocaulis

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    THz-TDS with different origins

    Fig. 3. THz-TDS with different origins

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    THz absorption coefficients of Curcuma with four origins. (a) One-dimensional absorption coefficient; (b) three-dimensional absorption coefficient

    Fig. 4. THz absorption coefficients of Curcuma with four origins. (a) One-dimensional absorption coefficient; (b) three-dimensional absorption coefficient

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    Loss diagrams of SVM classifier. (a) Hinge loss; (b) ψ learning loss; (c) normalized Sigmoid loss; (d) ramp loss

    Fig. 5. Loss diagrams of SVM classifier. (a) Hinge loss; (b) ψ learning loss; (c) normalized Sigmoid loss; (d) ramp loss

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    Flow chart of terahertz identification of different origins

    Fig. 6. Flow chart of terahertz identification of different origins

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    PCA classification of four origins

    Fig. 7. PCA classification of four origins

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    Parameter selection of Ramp Loss K-SVC

    Fig. 8. Parameter selection of Ramp Loss K-SVC

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    Number of neurons in the hidden layer

    Fig. 9. Number of neurons in the hidden layer

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    • Table 1. Accuracy of four kinds of identification models

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      Table 1. Accuracy of four kinds of identification models

      TypeClassification results (true/total)
      Ramp Loss K-SVCSVCRFELM
      Curcuma Wenyujin50/5050/5050/5047/50
      Curcuma phaeocaulis42/5011/5030/5025/50
      Curcuma longa44/5046/5036/5025/50
      Curcuma kwangsieis50/5045/5043/5040/50
      Accuracy /%937679.568.5
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    Jinqiu Rao, Liyi Chen, Pengpeng Bai, Tingting Zhang, Qiduo Zhao, Feng Qiu. Identification of Four Origins of Curcuma Based on Terahertz Time-Domain Spectroscopy[J]. Laser & Optoelectronics Progress, 2021, 58(22): 2200002

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    Paper Information

    Category: Reviews

    Received: Nov. 30, 2020

    Accepted: Jan. 22, 2021

    Published Online: Oct. 29, 2021

    The Author Email: Qiduo Zhao (121213358@qq.com), Feng Qiu (fengqiu20070118@163.com)

    DOI:10.3788/LOP202158.2200002

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology