Abstract
NDIR method is one of the important nitrogen dioxide concentration measurement methods. The original and the transmission light intensity on the nitrogen dioxide attached on the protection windows is attenuated because of the soot scattering and absorption and the received light intensity on the nitrogen dioxide Characteristic absorption wavelength is deviated from the theoretical absorption light intensity, so the nitrogen dioxide concentration measurement accuracy is decreased. The protection windows pollution interference caused by the monodispersion soot is discussed in this paper. The numerical simulation based on the Mie theory results show that the nitrogen dioxide concentration measurement accuracy is related to the soot concentration, soot diameter and so on. The solution method of the windows pollution interference is brought out and the nitrogen dioxide concentration measurement accuracy can be improved.
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