Flame sensing system

Details Flame sensing system Flame sensing system

1977-08-17

1979-07-03

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250340, G01J 100

Patent

active

041601645

ABSTRACT:
The present invention is concerned with a flame sensing system utilizing infra-red rays by resonant radiation of carbon dioxide which system gives no erroneous information due to discharge of thunder, solar light or the like and has high sensitivity and S/N ratio. The flame sensing system according to the invention is characterized in that a flame is detected continuously for a short time in terms of difference in intensity between a first infra-red rays of a first wavelength produced by resonant radiation of carbon dioxide and a second infra-red rays of a wavelength located in the vicinity of said first wavelength in the region of wavelength in which there is little absorption by carbon dioxide in the air and then a warning device is actuated while the intensity of said second infra-red rays remains beyond a predetermined level.

REFERENCES:
patent: 3026413 (1962-03-01), Taylor
patent: 3539807 (1970-11-01), Bickel
patent: 3903418 (1975-09-01), Horn

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