Publication Date
1-2001
Document Type
Technical Report
Organizational Units
College of Natural Science and Mathematics, Chemistry and Biochemistry
Keywords
Atmospheric chemistry, Emissions, Pollutants
Abstract
All on-road remote sensors or which we are aware carry out at least a measurement of the CO/CO2 ratio in the exhaust of a passing vehicle. It is possible for an interested party to carry out a quantitative evaluation of the precision of this measurement. This evaluation can be done without going to the expense and complexity of an on-road audit using a vehicle of known emissions (wet gas audit), or a vehicle designed to puff surrogate compressed gas mixtures of known ratios (dry gas audit). The measurement of exhaust CO/CO2 ratio is obtained by estimating the slope of a graph of CO versus CO2 (or properly delta CO versus delta CO2). Evaluation is carried out by observing the quality of the individual data points which are used to derive this slope. Several on-road remote sensors operate for 0.5 seconds at 100z, thus obtaining 50 data points for this correlation. Several on-road remote sensors use a puff of gas of known CO/CO2 ratio as a field calibration. For these sensors, the system operator can display the CO/CO2 graph from a calibration, whether the calibration was considered valid or not.
Copyright Statement / License for Reuse
Copyright Date
1-1-2001
Rights Holder
Donald H. Stedman
Provenance
Received from author
File Format
application/pdf
Language
English (eng)
Extent
6 pgs
File Size
73 KB
Publication Statement
Copyright is held by the author. User is responsible for all copyright compliance.
Recommended Citation
Stedman, D. H. (2001). How to evaluate an on-road remote sensor. Denver, CO: University of Denver.