Application Of An Infrared Gas-Filter Correlation Spectrometer For Measurement Of Methanol Concentrations In Automobile Exhausts

Soyoung Cha

doi:10.1117/12.936514

10 December 1986 Application Of An Infrared Gas-Filter Correlation Spectrometer For Measurement Of Methanol Concentrations In Automobile Exhausts

Soyoung Cha

Author Affiliations +

Proceedings Volume 0685, Infrared Technology XII; (1986) https://doi.org/10.1117/12.936514
Event: 30th Annual Technical Symposium, 1986, San Diego, United States

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.

Citation Download Citation

Soyoung Cha "Application Of An Infrared Gas-Filter Correlation Spectrometer For Measurement Of Methanol Concentrations In Automobile Exhausts", Proc. SPIE 0685, Infrared Technology XII, (10 December 1986); https://doi.org/10.1117/12.936514

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