Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Reexamination Certificate
1999-02-08
2001-05-29
Hannaher, Constantine (Department: 2878)
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
Reexamination Certificate
active
06239434
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates generally to optical flame detection.
Previous silicon carbide flame detectors such as described in Brown et al., U.S. Pat. No. 5,589,682, issued Dec. 31, 1996, detect the presence of a flame and measure the intensity of the flame's photon flux over a wide range of wavelengths. The measured intensity, however, does not always correlate to flame temperature, particularly in multiple flame combustors.
BRIEF SUMMARY OF THE INVENTION
It is therefore seen to be desirable to have a more direct temperature determination technique.
Briefly, in accordance with one embodiment of the present invention, an optical spectrometer for combustion flame temperature determination includes at least two photodetectors positioned for receiving light from a combustion flame, each of the at least two photodetectors having a different, overlapping bandwidth for detecting a respective output signal within the OH emission band; and a computer for subtracting a respective output signal of a first one of the at least two photodetectors from a respective output signal of a second one of the at least two photodetectors to obtain a segment signal, and using the segment signal to determine the combustion flame temperature.
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Agosti Ann M.
Breedlove Jill M.
Gabor Otilia
General Electric Company
Hannaher Constantine
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