Method for noise-reducing reconstruction of sulfur dioxide ultraviolet difference absorption spectrum based on EMD

Abstract

The invention relates to a method for noise-reducing reconstruction of a sulfur dioxide ultraviolet difference absorption spectrum based on EMD. The method includes the steps that a standard absorption section and a real-time collecting spectrum of a sulfur dioxide ultraviolet band are treated, and a difference absorption section STdacs and a difference absorption spectrum SAda are extracted; STdacs and SAda are standardized, so that S'Tdacs and S'Ada are obtained; seven-dimension EMD decomposition is carried out on S'Tdacs and SAda, so that corresponding eigenmode functions are obtained, the seven eigenmode functions IMF corresponding to the difference absorption section are marked as IMF (j) dacs, the seven eigenmode functions IMF corresponding to the difference absorption spectrum are marked as IMF (j) da, and j is equal to 1, 2, 3......7; the association coefficient R (j) of each IMF (j) dacs and the corresponding IMF (j) da is calculated, an appropriate TR is set for R (j), and IMF (j) da with R (j) larger than TR is sieved; difference absorption spectrum reconstruction is carried out through the sieved IMF (j) da and Ra. The actual collecting spectrum is reconstructed, and standardized treatment is carried out in a targeted mode during reconstruction.

Description

Technical field [0001] The invention belongs to the field of gas concentration detection, and relates to differential optical absorption spectroscopy, in particular to an EMD-based method for noise reduction and reconstruction of sulfur dioxide ultraviolet differential absorption spectra. Background technique [0002] With the vigorous progress of desulfurization construction in my country's thermal power plants and other industries, my country's total SO2 emissions during the "Twelfth Five-Year Plan" period have been reduced by 6%. During the "13th Five-Year Plan" period, my country's SO 2 Total emissions continue to consolidate SO 2 The trend of emission reduction, it is planned to achieve the emission reduction target of 10% to 15%, and to achieve SO in industries such as thermal power plants. 2 Of ultra-low emissions. This pair of SO based on UV differential absorption spectroscopy technology 2 The detection of concentration puts forward the requirements of further improvemen...

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Problems solved by technology

[0005] In 2006, Chen Xiaohu's master's thesis provided a "Theoretical Analysis and Experimental Research of Differential Absorption Spectroscopy Technology for Combustion Emission Flue Gas Monitoring". Due to the current situation of poor stability and accuracy, a method of measuring smoke concentration using differential absorption spectroscopy (DOAS) is proposed to realize online measurement of smoke concentration

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