Laser-induced breakdown spectroscopy-based tea classification and identification method

A laser-induced breakdown and spectroscopy technology, applied in molecular entity identification, material excitation analysis and other directions, can solve the problems of complex detection process, low efficiency and low accuracy of tea classification and detection, and achieve simplified detection process, rapid identification, The effect of improving efficiency

Active Publication Date: 2015-07-29
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] Aiming at the shortcomings of low tea classification detection efficiency, complex detection process and low accuracy at present, the present invention proposes a laser-induced breakdown spectroscopy tea typ

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  • Laser-induced breakdown spectroscopy-based tea classification and identification method
  • Laser-induced breakdown spectroscopy-based tea classification and identification method
  • Laser-induced breakdown spectroscopy-based tea classification and identification method

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Embodiment Construction

[0021] An embodiment of the present invention will be specifically described below with reference to the accompanying drawings.

[0022] The designers of the present invention performed the following experiments according to the present invention.

[0023] Select six tea samples of Longjing green tea, Mengding Huangya, white tea, Tieguanyin, Wuyi black tea and Pu'er tea, and use the method of the present invention to discriminate their types. In order to simplify the analysis process, they are numbered respectively and marked as 1, 2, 3, 4, 5 and 6 in turn. Considering that the physical properties of the sample, such as the dryness of the sample, the uniformity and density of the grinding will affect the spectral signal to a certain extent, the sample is simply pretreated before the LIBS detection experiment. First, the above six tea samples were dried using an electric blast drying oven at a temperature of 80°C for about 5 hours. All tea leaves were then ground using an aga...

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Abstract

The invention discloses a laser-induced breakdown spectroscopy (LIBS)-based tea classification and identification method, and belongs to the field of spectral analysis. The method comprises the following steps: performing preliminary analysis on elementary composition of a tea sample by using an LIBS detection device and selecting the characteristic spectral line of an element with larger content difference as an analysis index; then collecting a plurality of groups of spectrums for each standard tea sample and dividing the spectrum data of each standard tea sample into two parts, wherein one part is used as a training sample to establish a discriminant analysis model, and the other part is used as a test sample for estimating the accuracy of the discriminant model; performing discriminant analysis on to-be-tested tea sample, then adjusting an established classification model, and comparing with the LIBS spectrum data model of each element in an established database to determine the type of to-be-identified tea. The method has the advantages of high discrimination accuracy and simple process, and can provide a reference method for detection of the tea and the type recognition.

Description

Technical field: [0001] The invention belongs to the field of spectral analysis, and in particular relates to a method for detecting and classifying tea leaves by combining laser-induced breakdown spectroscopy with a discriminant analysis method. The method can quickly and accurately identify different types of tea, significantly improve the efficiency of tea component detection, and effectively ensure the quality and safety of tea. Background technique: [0002] Tea originated in China and has been widely spread all over the world. Because tea contains many components that are beneficial to the human body, more and more people in the world like to drink tea, and tea is one of the most popular non-alcoholic beverages at present. In addition, with the take-off of my country's economy, the overall living standards and quality of residents have been greatly improved. Now people pay more and more attention to the quality and safety of food, and tea is no exception. In my count...

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Application Information

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IPC IPC(8): G01N21/63
CPCG16C20/20G01N21/718G01N33/02G01N2021/8466
Inventor 郑培超刘红弟王金梅石珉杰薛淑文
Owner CHONGQING UNIV OF POSTS & TELECOMM
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