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Classified identification method for tea based on terahertz time-domain spectroscopy

A terahertz time-domain and terahertz technology, which is applied in the field of tea classification and identification based on terahertz time-domain spectroscopy technology, can solve limitations and other problems, and achieve the effect of short test time and high identification accuracy

Inactive Publication Date: 2014-05-28
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a tea classification and identification method based on terahertz time-domain spectroscopy technology to solve the limitations of the existing tea classification and identification technology

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  • Classified identification method for tea based on terahertz time-domain spectroscopy
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  • Classified identification method for tea based on terahertz time-domain spectroscopy

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Embodiment Construction

[0019] The tea classification and identification method based on terahertz time domain spectrum proposed by the present invention comprises the following steps:

[0020] 1) Measure the terahertz time-domain spectrum of standard tea and establish a spectral database;

[0021] 2) Establish a classification and identification model for tea based on the terahertz time-domain spectrum of tea;

[0022] 3) Measure the terahertz time-domain spectrum of the tea to be identified, and identify the tea to be identified according to the established classification identification model and the terahertz spectrum of the tea to be identified.

[0023] Because terahertz waves are sensitive to the vibration and rotation modes of organic molecules, the terahertz spectrum of substances has fingerprints, and the terahertz time-domain spectroscopy technology can simultaneously obtain amplitude and phase information, which is rich in information, and the terahertz spectrum of substances is The finge...

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Abstract

The invention discloses a classified identification method for tea based on a terahertz time-domain spectroscopy. The classified identification method mainly comprises the following steps: firstly, acquiring an absorption spectrum of a standard tea sample in a terahertz wave band by using a terahertz time-domain spectroscopy measuring device; secondly, selecting spectrum data in the proper wave band as the feature of the tea and extracting main data features of the tea; establishing a classification model of the tea by adopting a neural network method; obtaining a terahertz absorption spectrum of the tea to be identified according to the method, extracting the feature of the tea, calling the established model for classifying and determining the varieties of the tea to be identified. The classified identification method has the advantages of no need of complex pretreatment process, short testing time, little influence from subjective factors, no damage to the detected sample and high identification accuracy. The classified identification method is applicable to the identification of conventional common tea varieties.

Description

technical field [0001] The invention belongs to the application field of terahertz technology, and in particular relates to a tea classification and identification method based on terahertz time-domain spectroscopy technology. Background technique [0002] Terahertz (1THz=10 12 Hz) waves generally refer to electromagnetic wave radiation with a frequency ranging from 0.1 THz to 10 THz, which is between microwaves and infrared light. The terahertz wave technology has the following characteristics: (1) The terahertz time-domain spectroscopy technology adopts the optical pulse sampling detection method, which can obtain the transient electric field of the terahertz wave, that is, obtain the amplitude and phase information at the same time. (2) Terahertz radiation has a high transmittance to many substances such as ceramics, plastics, and textile fibers, and can be used for quality control of these materials. (3) Terahertz radiation is a very safe electromagnetic radiation. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 曹丙花任万磊范孟豹
Owner CHINA UNIV OF MINING & TECH
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