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Proceedings Paper

Application Of An Infrared Gas-Filter Correlation Spectrometer For Measurement Of Methanol Concentrations In Automobile Exhausts
Author(s): Soyoung Cha
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Paper Abstract

Spectroscopic methods provide an attractive alternative to wet chemical methods due to their fast responses. An instrument using the principle of gas-filter correlation was built in a laboratory and tested to measure methanol concentrations in exhausts from a methanolfueled vehicle. The instrument utilized the infrared spectrum between 8 pm and 11 pm. The sensitivity and discrimination against other interfering gases were adequate enough to obtain a detection limit of 0.5 ppm. The precision of the instrument varied from 5.5% to 1.2% for methanol concentrations ranging 7 ppm to 113 ppm. The study demonstrated a good agreement with the gas chromatograph analyses. The instrument has a strong potential for real-time monitoring of automobile emissions. A small drift in the zero setting was primarily due to the unstable temperature of optical components, especially the liquid-nitrogen cooled detector. An improvement in stability can be achieved by thermally insulating the analyzer to maintain a constant temperature.

Paper Details

Date Published: 10 December 1986
PDF: 7 pages
Proc. SPIE 0685, Infrared Technology XII, (10 December 1986); doi: 10.1117/12.936514
Show Author Affiliations
Soyoung Cha, The University of Illinois at Chicago (United States)

Published in SPIE Proceedings Vol. 0685:
Infrared Technology XII
Richard A. Mollicone; Irving J. Spiro, Editor(s)

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