METHOD AND APPARATUS FOR REMOTE MEASUREMENT OF EXHAUST GAS

摘要

A method and apparatus for sensing a composition of exhaust plume (13) includes a light source (11) that radiates an infrared light beam (12) 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 (20) 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.