15 December 1998 Infrared absorption device for analysis of exhaust gases from moving vehicles
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Abstract
An IR absorption system for real-time measurement of pollutants in exhaust gases from moving vehicles is proposed. The system consists of an IR source at one side of the road, and a wheel with specific IR filters and a detector at the other side. We have, firstly, simulated the expected exhaust gases concentrations at different inspection conditions. The well-known HITRAN database has been used in order to estimate intensities, signal-to-noise ratio and threshold concentration levels. These results have then been verified by open-path Fourier transform IR (FTIR) spectroradiometry of the exhaust gases from both gasoline and Diesel vehicles. This confirms the feasibility of such a device by using some conventional filters -those of CO, CO2 and NO2 for example - some ultra-narrow sold state Fabry-Perot filters - that of NO for example. As the proposed system monitors all kinds of oxides and hydrocarbons in exhaust gases the stoichiometry of the combustion or 'lambda coefficient' may be also deduced and it is fully applicable for 'ministry of transport' test of vehicles.
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Jose-Luis Perez-Diaz, Jose-Luis Perez-Diaz, Fernando Lopez, Fernando Lopez, Vicente Diaz-Lopez, Vicente Diaz-Lopez, Antonio J. de Castro, Antonio J. de Castro, Susana Briz, Susana Briz, Juan Melendez, Juan Melendez, } "Infrared absorption device for analysis of exhaust gases from moving vehicles", Proc. SPIE 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques, (15 December 1998); doi: 10.1117/12.332649; https://doi.org/10.1117/12.332649
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