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| Study on Differential Optical Absorption Spectroscopy Data Processing Based on Discrete Spectrum Correction |
| JIA Gui-hong1,2,ZHANG Jian-jun2,ZHENG Hai-ming2 |
1. School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China
2. School of Energy Power and Mechanical Engineering, North China Electric Power University, Baoding, Hebei 071003, China |
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Abstract The Fourier transform filtering method is used to filter out the noise in the differential optical absorption spectrum (DOAS) data. Due to the limitation of frequency resolution, the amplitude error is large, which affects the detection accuracy of gas. A method that discrete spectrum correction differential optical absorption spectrum data method is proposed, which uses the barycenter of the spectral line in the main lobe of the discrete spectrum to find the coordinate of the peak, and compensates the amplitude error to improve the measurement accuracy of gas. Many groups of SO2 gases with different concentrations are measured. The results show that the inversion error of the spectrum correction method is less than 5%, and compared with the traditional least square method and the Fourier transform filtering method, the error is reduced by 0.36% and 0.88% respectively. When the spectral lines are shifted by 2 sampling intervals 0.28nm, the average error of the traditional least square method is 31.8%, and the maximum error of the spectrum correction method is 3.8%. The latter is obviously superior to the former.
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Received: 17 July 2020
Published: 20 August 2021
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2021, Vol. 42 
