A Multigas Analyzer For Automobile Exhausts

John D. Pembrook; Darrell E. Burch

doi:10.1117/12.955162

15 November 1976 A Multigas Analyzer For Automobile Exhausts

John D. Pembrook, Darrell E. Burch

Proceedings Volume 0095, Modern Utilization of Infrared Technology II; (1976) https://doi.org/10.1117/12.955162
Event: 20th Annual Technical Symposium, 1976, San Diego, United States

Abstract

The multigas analyzer simultaneously measures the concentrations of CO, CH4 and CO2 in flowing samples of automobile exhaust. Three channels share a single rotating gas correlation cell and measure the individual concentrations of CO and CH4. Two CO channels with different sample cell lengths extend the useful range. A rotating dual-filter system measures the CO2 concentrations. As many as three separate CO2 channels can share a rotating filter assembly. A system employing two fixed filters and two detectors measures the concentration of H2O and automatically accounts for a slight interference by this gas in the CH4 channel. Discrimination against other typical exhaust gases is excellent. An automatic gain control minimizes calibration drift. The ranges of measurable concentrations are 0.3 ppm (parts-per-million) to 3000 ppm of CH4; 0.7 ppm to 10% of CO; and 60 ppm to 30% of CO2, where the minimum concentrations correspond to the peak-to-peak noise levels with one-second time constants. The theory of operation, the measurement capabilities, and the physical characteristics are described.

Citation Download Citation

John D. Pembrook and Darrell E. Burch "A Multigas Analyzer For Automobile Exhausts", Proc. SPIE 0095, Modern Utilization of Infrared Technology II, (15 November 1976); https://doi.org/10.1117/12.955162

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KEYWORDS

Carbon monoxide

Absorption

Gases

Transmittance

Carbon dioxide

Signal detection

Sensors

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