Time-Resolved Measurement of Vehicle Sulfate and Methane Emissions with Tunable Diode lasers 800510
A new analytical method, absorption of tunable diode laser radiation, can detect small concentrations of gases with fast response. This technique has been applied to the detection of vehicle sulfate emissions in the form of sulfuric acid (H2SO4) vapor. Previously available methods for sulfate analysis required collecting samples for 10 min. or more. Our laser system has a response time of 2.4 s. This allowed tracking the sulfate emissions of a vehicle during a Highway Fuel Economy Test. The data suggests that catalyst temperature is the major parameter controlling sulfate emissions and that storage and release of sulfur occurs at low and high catalyst temperatures, respectively.
The same method detected methane during both the Highway Fuel Economy Test and the Federal Test Procedure. It identified the conditions, and corresponding concentrations, for high methane emissions. A qualitative comparison with total hydrocarbon emissions uncovered significant differences during accelerations.
Citation: Hill, J. and Majkowski, R., "Time-Resolved Measurement of Vehicle Sulfate and Methane Emissions with Tunable Diode lasers," SAE Technical Paper 800510, 1980, https://doi.org/10.4271/800510. Download Citation
Author(s):
John C. Hill, Richard F. Majkowski
Affiliated:
General Motors Research Laboratories
Pages: 11
Event:
1980 Automotive Engineering Congress and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Fuel economy
Hydrocarbons
Methane
Emissions
Reaction and response times
Test procedures
Lasers
Catalysts
Radiation
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