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Proceedings Paper

Analysis of exhaust from clean-fuel vehicles using FTIR spectroscopy
Author(s): Paul L. Rieger; Christine E. Maddox
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Paper Abstract

Exhaust from vehicles powered by reformulated gasoline and methanol/gasoline blends has been analyzed by FTIR spectroscopy in parallel with conventional techniques. Linear regression analysis of the data showed the following relationships between the FTIR and conventional measurements: methane (0.89X + 0.31, R2 equals 0.96), carbon monoxide (0.82X + 34, R2 equals 0.96), formaldehyde (0.84X + 0.003, R2 equals 0.97), methanol (0.72X + 4.0, R2 equals 0.86), nitric oxide (0.93X + 0.83, R2 equals 0.89), and total non- methane hydrocarbons (1.02X + 2.8, R2 equals 0.96), where the slope, intercept (ppm) and correlation coefficient are shown in parenthesis. With the exception of methanol, good linear correlations are indicated. The apparent non-linearity for methanol is most likely due to the coaddition of interferograms during large concentration transients. Although the validity of FTIR measurements must be assessed on a compound-by-compound basis, the results of this study indicate that valid measurements of motor vehicle exhaust components can be made with non specialized (non-real-time) FTIR instruments.

Paper Details

Date Published: 1 May 1991
PDF: 12 pages
Proc. SPIE 1433, Measurement of Atmospheric Gases, (1 May 1991); doi: 10.1117/12.46172
Show Author Affiliations
Paul L. Rieger, California Air Resources Board (United States)
Christine E. Maddox, California Air Resources Board (United States)

Published in SPIE Proceedings Vol. 1433:
Measurement of Atmospheric Gases
Harold I. Schiff, Editor(s)

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