Substance Identification Method Based on Terahertz Spectroscopy

An identification method, terahertz technology, applied in the field of material identification based on terahertz spectroscopy, can solve problems such as difficult to be widely used, difficult to guarantee the accuracy of results, and the identification method is not robust, so as to eliminate instrument differences and Subjective differences, elimination of subjective differences, robust effects

Active Publication Date: 2019-04-30
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

Such a recognition method is not robust, the accuracy of the result is difficult to guarantee, and it is difficult to be widely used

Method used

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  • Substance Identification Method Based on Terahertz Spectroscopy
  • Substance Identification Method Based on Terahertz Spectroscopy
  • Substance Identification Method Based on Terahertz Spectroscopy

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Embodiment Construction

[0029] The specific implementation manner of the present invention will be described below in conjunction with the accompanying drawings and embodiments.

[0030]

[0031] figure 1 It is a flow chart of the substance identification method based on terahertz spectroscopy of the present invention.

[0032] Such as figure 1 As shown, in this embodiment, the substance identification method based on terahertz spectroscopy includes the following steps:

[0033] Step 1: Scan known samples with a terahertz time-domain spectroscopy system to obtain time-domain signal spectra of each known sample at different sampling frequencies.

[0034] In this embodiment, the terahertz time-domain spectroscopy system (hereinafter referred to as THz-TDS) from the Shanghai Key Laboratory of Modern Optical Systems (hereinafter referred to as the laboratory) is used to scan known samples, and the terahertz time-domain spectroscopy system (hereinafter referred to as THz-TDS) from Shanghai Gaojing Ima...

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Abstract

The invention provides a substance identification method based on terahertz spectroscopy, which is used to identify samples to be tested, comprising the following steps: step 1, scanning a predetermined number of known samples with a terahertz time-domain spectroscopy system; step 2, scanning each Preprocess each time-domain signal atlas to obtain the normalized spectrum of each time-domain signal atlas; step 3, map the time sampling frequency of the normalized spectrum to a predetermined frequency to obtain a unified spectrum; step 4, use the unified spectrum as a feature Vector, train the SVM classifier; step 5, use any terahertz time-domain spectroscopy system to scan the sample to be tested, preprocess the obtained time-domain signal spectrum, and map the sampling frequency; step 6, use the trained The SVM classifier classifies the spectrum of the sample to be tested to obtain the name of the sample to be tested. The method provided by the invention eliminates instrument differences and subjective differences, is robust and can be widely used.

Description

technical field [0001] The invention relates to a substance identification method, in particular to a substance identification method based on terahertz spectroscopy. Background technique [0002] Terahertz wave is an electromagnetic wave with a frequency ranging from 0.1THz to 10THz, and its wave band is between microwave and infrared, which has rich scientific significance and broad application prospects. The energy of terahertz photons is only millielectronvolts, and will not damage the measured substance due to ionization, and most polar molecules can resonate in the THz band, absorb energy and be detected to obtain the corresponding spectrum, so the terahertz spectrum is non-destructive Detection and identification of substances provides a new effective way. [0003] In recent years, many research institutions at home and abroad have conducted research on terahertz spectroscopy and identification based on terahertz spectroscopy. Because terahertz spectroscopy has the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3586G06K9/62
CPCG01N21/3586G06F18/2411
Inventor 徐鸣谦黄慧朱亦鸣彭滟
Owner UNIV OF SHANGHAI FOR SCI & TECH
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