Method and apparatus for remote measurement of exhaust gas
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United States of America Patent
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Nov 3, 1998
Grant Date -
N/A
app pub date -
Feb 24, 1997
filing date -
Feb 24, 1997
priority date (Note) -
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Abstract
A method and apparatus for sensing a composition of an exhaust plume includes a light source that radiates an infrared light beam having a plurality of predetermined wavelengths. A first of the predetermined wavelengths is associated with carbon dioxide and a second of the predetermined wavelengths is associated with a second gas, such as a hydrocarbon or carbon monoxide. The apparatus also includes a detector unit that detects the beam passing through the plume. The apparatus computes a ratio of the second gas to carbon dioxide based upon the first and second detected wavelengths, and this ratio is then multiplied by a predetermined estimation of a concentration of carbon dioxide in the plume.
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