光谱学与光谱分析 |
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The Spectral Characteristic Wavelength Selection and Parameter Optimization Based on Tikhonov Regularization |
ZHAO An-xin1, 2, TANG Xiao-jun2*, ZHANG Zhong-hua2, 3, LIU Jun-hua2 |
1. Xi’an University of Science and Technology, Xi’an 710054, China 2. State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China 3. National Institute of Metrology, China, Beijing 100013, China |
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Abstract In the multicomponent mixture hydrocarbon gases Fourier transform infrared (FTIR) quantitative analysis, especially for light alkane gases, it is not easy to establish the quantitative analysis model because their IR spectra absorption peaks are seriously overlapped. Aiming at this problem, the Tikhonov regularization algorithm was used to select the characteristic wavelengths for seven kinds of light alkane mixture gases FTIR which are composed with methane, ethane, propane, iso-butane, n-butane, iso-pentane and n-pentane. And then the wavelength selection was used to establish the quantitative analysis model. By comparing the analysis characteristics wavelength selection and TR parameters optimization of the mixed gases in the infrared all wave band, the first absorption peak band and the second peak band, the characteristic wavelength of 7 kinds of gases were selected by Tikhonov algorithm. The wavelength selection and Tikhonov regularization parameters were used to test the actual measured methane spectral data, and then we got that with other gas components the max cross sensitivity was 11.153 7%, the minimum cross sensitivity was 1.239 7%, and the root mean square prediction error was 0.004 8. The Tikhonov regularization algorithm effectively enhanced the accuracy in the light alkane mixed gas quantitative analysis. The feasibility of alkane gases mixture Fourier transform infrared spectrum wavelength selection was preliminarily verified by using the Tikhonov regularization algorithm.
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Received: 2013-08-14
Accepted: 2014-03-03
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Corresponding Authors:
TANG Xiao-jun
E-mail: xiaojun_tang@mail.xjtu.edu.cn
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