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METHOD FOR DETECTING NOTOGINSENG USING TERAHERTZ TECHNOLOGY

  • US 20190323956A1
  • Filed: 04/18/2019
  • Published: 10/24/2019
  • Est. Priority Date: 04/18/2018
  • Status: Active Grant
First Claim
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1. A method for detecting notoginseng using terahertz technology, comprising:

  • 1) pulverizing a notoginseng standard sample and a notoginseng test sample separately in a pulverizer;

    then mixing the pulverized standard sample and the pulverized test sample respectively with a polyethylene powder with the same ratio of between 1;

    4 and 1;

    6 to obtain a standard powder mixture and a test powder mixture;

    2) pressing the standard powder mixture and the test powder mixture separately in a tablet press to obtain a standard tablet and a test tablet for detection;

    3) reducing the humidity in the sample chamber of a terahertz spectrograph to less than 3%;

    storing a peak position;

    measuring a single channel of background; and

    acquiring a time-domain graph of the background without sample;

    4) placing the standard tablet and the test tablet on a sample holder successively;

    acquiring a time-domain graph of the standard tablet and a time-domain graph of the test tablet, respectively;

    5) transforming the time-domain graphs of the background, the standard tablet and the test tablet into frequency-domain graphs by Fourier transform;

    6) converting the frequency-domain graphs of the standard tablet, the test tablet and the background to obtain absorption spectra of the standard tablet and the test tablet by the following equation;

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