Abstract
The potential for on-road remote sensing of vehicle exhaustsusing 2.3 µm diode-laser-absorption-based CO sensors is examined. Usinga wavelength-modulation- spectroscopy (WMS) technique, 20 ppm sensitivitywith a detection bandwidth of ≃1.5 kHz is demonstrated inlaboratory experiments, which implies the ability to monitor CO emissionsfrom even the cleanest combustion-powered vehicles. The influence of thetemperature and composition of the exhaust gas on the inferred COconcentration through both linestrength and linewidth is also investigatedand we propose a novel approach to reduce these effects to ±3% inthe typical exhaust temperature range of 300-700 K. Thus, sensitive andremote measurements of vehicular CO effluent are possible without knowingthe exact temperature or composition of the exhaust. This influence oftemperature is further exploited to suggest a two-line CO2-absorptionthermometry method with a large temperature sensitivity to identifycold-start vehicles.
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