Emd-based method for noise reduction and reconstruction of sulfur dioxide ultraviolet differential absorption spectrum

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 spectrum, in particular to an EMD-based method for reducing noise and reconstructing sulfur dioxide ultraviolet differential absorption spectrum. Background technique [0002] With the vigorous development of desulfurization construction in thermal power plants and other industries in my country, the total amount of SO2 emissions in my country has decreased by 6% during the "Twelfth Five-Year Plan" period. During the "Thirteenth Five-Year Plan" period, my country's SO 2 Total emissions of SO continue to consolidate 2 The trend of emission reduction is planned to achieve the emission reduction target of 10% to 15%, and realize the reduction of SO in thermal power plants and other industries. 2 ultra-low emissions. This pair of SO based on ultraviolet differential absorption spectroscopy 2 The detection of concentration puts forward the re...

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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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