G - Physics – 08 – B
Patent
G - Physics
08
B
340/155.1
G08B 17/00 (2006.01) F23N 5/08 (2006.01) G08B 17/12 (2006.01)
Patent
CA 1120132
ABSTRACT OF THE DISCLOSURE 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 dis- charge of thunder, solar light or the like and has a high sensi- tivity and S/N ratio. The flame sensing system according to the invention is characterized in that a flame is detected continu- ously for a short time in terms of difference in intensity between a first infra-red rays of a first wavelength produced by reson- ant 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 car- bon 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.
284954
Kokusai Gijutsu Kaihatsu Co. Ltd.
Security Patrols Co. Ltd.
Swabey Ogilvy Renault
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