光谱学与光谱分析 |
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Research on Concentration Retrieval of Gas FTIR Spectra by Interval Extreme Learning Machine and Genetic Algorithm |
CHEN Yuan-yuan1, 3, WANG Zhi-bin1, 2, 3, WANG Zhao-ba1, 2 , LI Xiao3 |
1. State Key Laboratory for Electronic Measurement Technology, North University of China, Taiyuan 030051, China 2. Key Lab of Instrumentation Science & Dynamic Measurement(North University of China), Ministry of Education, Taiyuan 030051, China 3. Engineering Technology Research Center of Shanxi Province for Opto-Electronic Information and Instrument, Taiyuan 030051, China |
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Abstract This paper proposed a novel effective quantitative analysis method for FTIR spectroscopy of polluted gases, which select the best wavenumbers based on the idea of interval dividing. Meanwhile, genetic algorithm was adopted to optimize the connect weights and thresholds of the input layer and the hidden layer of extreme learning machine (ELM) because of its global search ability. Firstly, the whole spectrum region was divided into several subintervals; Secondly, the quantitative analysis model was established in each subinterval by using optimized GA-ELM; Thirdly, the best combination of subintervals was selected according to the generalized performance of each subinterval model by computing the parameters root mean square error (RMSE) and determined coefficients r. In this paper, the mixture of CO, CO2 and N2O gases were selected as the research object and the whole spectrum range was from 2 140 to 2 220 cm-1. The experiment results showed that the RMSE of model established with the selected wavenumbers was 154.996 3, the corresponding r can reach 0.987 4, and the running time was just 0.8 seconds, which indicated that the concentration retrieval model established with the proposed Interval-GA-ELM (iGELM) method can not only reduce the modeling time, but also can improve the stability and predict accuracy, especially under the condition of the exist of interferents, which providing an effective approach to the remote analysis of polluted gases.
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Received: 2013-11-08
Accepted: 2014-02-16
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Corresponding Authors:
CHEN Yuan-yuan
E-mail: chenyy-000@163.com
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