A mixed oil identification method based on a three-dimensional fluorescence spectrum and a Tchebichef moment

Abstract

The invention discloses a mixed oil identification method based on a three-dimensional fluorescence spectrum and a Tchebichef moment. Firstly, the three-dimensional fluorescence spectral data (EEM) ofthe sample library are obtained by a fluorescence spectrometer, an EEM grayscale image is obtained by grayscale processing, and the shape feature of EEM grayscale image is extracted by Tchebichef moments, and the Tchebichef moments feature database of sample library is established. Then, the EEM of the sample to be measured is obtained, and the gray image of the EEM of the sample to be measured is obtained, and the Tchebichef moment characteristic data of the sample to be measured is obtained. Finally, all the Tchebichef moment characteristic data are processed by clustering analysis, and thequalitative results of the mixed oil are obtained. According to the qualitative results, the sample which belongs to the mixed oil is treated by stepwise regression, and the quantitative results of the mixed oil are obtained. The purpose of identifying the mixed oil is achieved.

Description

【Technical field】 [0001] The invention relates to the field of identification of mixed oils, in particular to the technical field of research on the identification method of mixed oils based on three-dimensional fluorescence spectrum and Tchebichef moments. 【Background technique】 [0002] With the increasing demand for oil in human society, the environmental pollution caused by oil is becoming more and more serious. Petroleum pollutants are a kind of environmental pollutants from a wide range of sources. Every link in the petroleum industry and petroleum product consumption chain may produce petroleum pollutants, such as chemical plant emissions, oil transportation, and ship oil pollution. The water body has brought serious harm. Petroleum can form a large area of ​​oil film on the surface of the water body, which not only hinders the material exchange between the water body and the atmosphere, produces toxic substances through photochemical reactions, but also causes seriou...

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Problems solved by technology

And due to the wide range of oil use types, it not only exists as an environmental pollutant with one oil itself, but more often it is mixed with other oils and widely exists in the environment, which brings great challenges to the detection of oil pollutants. more difficulties

[0003] At present, for oil pollution accidents, the source of pollutants and the responsibility for pollution accidents are mainly investigated through methods such as manual site surveys and inquiry investigations. However, the evidence obtained through these methods is arbitrary and the evidence is not strong enough.

The method described in the paper published by Pan Zhao, Wang Yutian, Shao Xiaoqing, Wu Xijun, and Yang Lili (Application of Three-dimensional Fluorescence Spectroscopy and Parallel Factor Analysis in the Detection and Analysis of Petroleum Pollutants) must accurately select the number of factors to correctly analyze the data. In addition, the concentration range of the sample must also meet certain conditions, which is more limited.

The method described in the invention patent (application number: 201310175204.4) applied by Chen Guoqing only extracts the center of gravity of the three-dimensional fluorescence spectrum as the feature of the sample, and the feature is single, which is difficult to satisfy the sample with complex three-dimensional fluorescence spectrum characteristics.

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