A New Method for High Precision Measurement of Ultra-low Concentration SO2
In order to achieve ultra-low emission online monitoring with higher accuracy,the paper demonstrates a new method of low concentration SO2 measurement based on DOAS and fast Fourier transform.Wavelet domain denoising was applied according to the characteristics of noise of raw spectrum.To reduce spectral leakage,the fast Fourier transform with Hanning window is used to extract the broad-band component of optical density.This method is a new differential absorption spectrum analysis method,which can be well fit the slow varying part of the original spectrum.When concentration ranges from 3 to 31ppm,the relative error of retrieved result is under 2%,and in many cases even lower than 1%.Experiment results indicate that the method in this work has high accuracy and linearity.
Coal-fired power plant Sulfur dioxide DOAS Fast Fourier Transform
Fenglian Fan Yongcai Guo Jingfang Zhao Yanping Wang Fang Chen
Key Laboratory of Optoelectronic Technology and Systems of Ministry of Education,Chongqing University,Chongqing 400044,China
国际会议
大连
英文
324-329
2019-03-29（万方平台首次上网日期，不代表论文的发表时间）