Abstract:

In order to overcome the overlapped absorption structures in differential optical absorption spectroscopy(DOAS),a method of spectrum correction based on Kalman filtering is developed.Kalman filtering,a modern re-cumive filtering,can corect disturbed spectrum signals even though the signals are strongly overlapped.This paper introduces DOAS in brief,analyzes the mechanism of Kalman filtering,Kalman filtering is applied to process the
differential optical absorption spectrum of SO₂ in the atmosphere,meanwhile,the influence of NO₂ and O₃ on SO₂ is discussed in this paper.Experimental results indicate that the proposed method can effectively corect overlap-ping spectra and greatly improve the accuracy of DOAS system.

Key words: differential optical absorption spectroscopy, Kalman filtering, correction, overlapping