Abstract
It becomes a key technology to measure the concentration of the vehicle exhaust components with the absorption spectra. But because of the overlap of gas absorption bands, how to separate the absorption information of each component gas from the mixed absorption spectra has become the key point to restrict the precision of the optical detection method. In this paper, the ex-perimental platform for the absorption spectrum of vehicle exhaust components has been established. Based on the ultraviolet absorption spectra measured with the platform of exhaust gas NO & NO2, the concentration regression model for the two components has been established with weighted partial least squares regression (WPLS). Finally the each spectral characteristic information of NO & NO2 gas has been separated and the concentration of each corresponding component has been reversed successfully.
Highlights
Nowadays the vehicle exhaust emissions have become one of the most important factors that affect the environmental air quality in our country
It becomes a key technology to measure the concentration of the vehicle exhaust components with the absorption spectra
Based on the ultraviolet absorption spectra measured with the platform of exhaust gas NO & NO2, the concentration regression model for the two components has been established with weighted partial least squares regression (WPLS)
Summary
Nowadays the vehicle exhaust emissions have become one of the most important factors that affect the environmental air quality in our country. It is urgent to strengthen the monitoring of vehicle exhaust emissions [1]. Because of the overlap of gas absorption bands, how to separate the absorption information of each component gas from the mixed absorption spectra has become the key point to restrict the precision of the optical detection method [2] [3]. In this paper, based on the measured ultraviolet absorption spectra of exhaust gas NO & NO2, the concentration regression models for the two components has been established with weighted partial least squares regression (WPLS). The each spectral characteristic information of NO & NO2 gas has been separated and the concentration of each corresponding component has been reversed successfully
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