| 光谱学与光谱分析 |
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| Discrimination of Crude Oil Samples Using Laser-Induced Time-Resolved Fluorescence Spectroscopy |
| HAN Xiao-shuang1, 2, LIU De-qing1, LUAN Xiao-ning1, GUO Jin-jia1, LIU Yong-xin2, ZHENG Rong-er1* |
1. Optics and Optoelectronics Laboratory, Ocean University of China, Qingdao 266100, China
2. College of Electronic Information Engineering, Inner Mongolia University, Huhhot 010021, China |
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Abstract The Laser-induced fluorescence spectra combined with pattern recognition method has been widely applied in discrimination of different spilled oil, such as diesel, gasoline, and crude oil. However, traditional three-dimension fluorescence analysis method, which is not adapted to requirement of field detection, is limited to laboratory investigatio ns. The development of oil identification method for field detection is significant to quick response and operation of oil spill. In this paper, a new method based on laser-induced time-resolved fluorescence combined with support vector machine (SVM) model was introduced to discriminate crude oil samples. In this method, time-resolved spectra data was descended into two dimensions with selecting appropriate range in time and wavelength domains respectively to form a SVM data base. It is found that the classification accurate rate increased with an appropriate selection. With a selected range from 54 to 74 ns in time domain, the classification accurate rate has been increased from 83.3% (without selection) to 88.1%. With a selected wavelength range of 387.00～608.87 nm, the classification accurate rate of suspect oil was improved from 84% (without selection) to 100%. Since the detection delay of fluorescence lidar fluctuates due to wave and platform swing, the identification method with optimizing in both time and wavelength domains could offer a better flexibility for field applications. It is hoped that the developed method could provide some useful reference with data reduction for classification of suspect crude oil in the future development.
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Received: 2014-10-31
Accepted: 2015-02-25
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Corresponding Authors:
ZHENG Rong-er
E-mail: rzheng@ouc.edu.cn
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