Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1997-02-24
1998-11-03
Porta, David P.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
25033913, 250372, G01N 2131
Patent
active
058312676
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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Gray Michael N.
Jack Michael D.
Nelson David R.
Peterson Jay C.
Envirotest Systems Corp.
Porta David P.
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