LASER HETERODYNE COMBUSTION-EFFICIENCY MONITOR AND ASSOCIATED METHODS

A laser-heterodyne combustion-efficiency monitor captures light emitted from a combustion zone during combustion and determines combustion efficiency based on the captured light. The monitor includes an optical detector that generates an electrical response by mixing the captured light with an optic...

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Bibliographic Details
Main Author SAPPEY, Andrew D
Format Patent
LanguageEnglish
Published 17.08.2023
Subjects
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
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Summary:A laser-heterodyne combustion-efficiency monitor captures light emitted from a combustion zone during combustion and determines combustion efficiency based on the captured light. The monitor includes an optical detector that generates an electrical response by mixing the captured light with an optical local-oscillator signal, and a signal filter that filters the electrical response to isolate a beat-note that is proportional to a target-species concentration in the combustion zone. The frequency of the local-oscillator signal determines the target species, which may be carbon monoxide, carbon dioxide, or another emission or absorption line that can be detected using laser-heterodyne radiometry. A laser generates the local-oscillator signal. The monitor may be extended to operate with several lasers emitting several local-oscillator signals at different frequencies, thereby allowing multiple target species to be detected simultaneously.
Bibliography:Application Number: US202118014472