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Proceedings Paper

Infrared absorption device for analysis of exhaust gases from moving vehicles
Author(s): Jose-Luis Perez-Diaz; Fernando Lopez; Vicente Diaz-Lopez; Antonio J. de Castro; Susana Briz; Juan Melendez
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Paper 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.

Paper Details

Date Published: 15 December 1998
PDF: 6 pages
Proc. SPIE 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques, (15 December 1998); doi: 10.1117/12.332649
Show Author Affiliations
Jose-Luis Perez-Diaz, Univ. Carlos III (Spain)
Fernando Lopez, Univ. Carlos III (Spain)
Vicente Diaz-Lopez, Univ. Carlos III (Spain)
Antonio J. de Castro, Univ. Carlos III (Spain)
Susana Briz, Univ. Carlos III (Spain)
Juan Melendez, Univ. Carlos III (Spain)


Published in SPIE Proceedings Vol. 3493:
Spectroscopic Atmospheric Environmental Monitoring Techniques
Klaus Schaefer, Editor(s)

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