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Proceedings Paper

Information extraction method of ultraviolet spectrum measurement of SO2 and NOx
Author(s): Changku Sun; Shumin Li; Bin Liu; Yumei Zhao
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Paper Abstract

The measuring principle of SO2 and NOx, which are the main gaseous contaminants in flue gas, is given based on the differential optical absorption spectroscopy (DOAS). And the structure and composition of the measurement system are introduced. In the aspect of obtaining the absorption feature of measured gas, a multi-resolution preprocessing method of original spectrum is adopted to denoise by the signal energy in different scales. On the other hand, the useful signal component is enhanced according to the signal correlation. These two procedures can improve the signal-noise ratio (SNR) effectively. In addition, the origin of the nonlinear factors is analyzed, that is caused by the actual measurement condition. And the polynomial approximation equation is deduced. In the lab, SO2 and NO are measured several times with the system using the data extraction method mentioned above. The average deviation is less than 1.5%, while the repeatability is less than 1%. In the scene of one power plant whose concentration of flue gas has a large variation range, the maximum deviation is 2.31% in the 18 groups contrast data.

Paper Details

Date Published: 2 February 2009
PDF: 15 pages
Proc. SPIE 7160, 2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications, 71600T (2 February 2009); doi: 10.1117/12.806672
Show Author Affiliations
Changku Sun, Tianjin Univ. (China)
Shumin Li, Tianjin Univ. (China)
Bin Liu, Tianjin Univ. (China)
Yumei Zhao, Tianjin LanYu Technology Co. Ltd (China)


Published in SPIE Proceedings Vol. 7160:
2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications
Shenghua Ye; Guangjun Zhang; Jun Ni, Editor(s)

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