Information extraction method of ultraviolet spectrum measurement of SO2 and NOx

Changku Sun; Shumin Li; Bin Liu; Yumei Zhao

doi:10.1117/12.806672

2 February 2009 Information extraction method of ultraviolet spectrum measurement of SO₂ and NO_x

Changku Sun, Shumin Li, Bin Liu, Yumei Zhao

Proceedings Volume 7160, 2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications; 71600T (2009) https://doi.org/10.1117/12.806672
Event: International Conference of Optical Instrument and Technology, 2008, Beijing, China

Abstract

The measuring principle of SO₂ and NO_x, 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.

Citation Download Citation

Changku Sun, Shumin Li, Bin Liu, and Yumei Zhao "Information extraction method of ultraviolet spectrum measurement of SO₂ and NO_x", Proc. SPIE 7160, 2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications, 71600T (2 February 2009); https://doi.org/10.1117/12.806672

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available