Two channel comparison-type fire or explosion detecting system

Details Two channel comparison-type fire or explosion detecting system Two channel comparison-type fire or explosion detecting system

1981-05-15

1983-11-08

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

250339, 250340, 340587, 340600, G08B 1712

Patent

active

044145420

ABSTRACT:
Photoelectric type detector responds to radiation in a narrow wavelength band characteristic of a fire or explosion, and a slow-response detector, such as a thermopile, is sensitive to radiation in a different narrow wavelength band centered at, for example, 4.4 microns, again characteristic of the same fire or explosion. The electrical outputs of the detectors are fed into a ratio unit which causes an AND gate to produce a fire or explosion indicating output only when the ratio of the output of the thermopile detector to the output of the other detector exceeds a predetermined value.

REFERENCES:
patent: 3825754 (1974-07-01), Cinzori et al.
patent: 3859520 (1975-01-01), Hertzberg et al.
patent: 3931521 (1976-01-01), Cinzori
patent: 4101767 (1978-07-01), Lennington et al.
patent: 4160163 (1979-07-01), Naksuchi
patent: 4206454 (1980-06-01), Schapira et al.
patent: 4220857 (1980-09-01), Bright
patent: 4296324 (1981-10-01), Kern et al.

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