Method of detecting a fire of open uncontrolled flames

Details Method of detecting a fire of open uncontrolled flames Method of detecting a fire of open uncontrolled flames

1988-04-26

1989-09-12

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

250340, 250554, 340587, G08B 1712

Patent

active

048664200

ABSTRACT:
A method of detecting fires utilizing its flicker frequency spectrum provides a standard theoretical flicker frequency spectrum which is compared to the real time spectrum over a 2 second time period. The comparison includes whether or not the real time fire spectrum deviates from the idealized fire spectrum by a minimum amount and has further discrimination against false fire signals, including the extent of time of the real time spectrum is outside a predetermined window and a limit on maximum deviations.

REFERENCES:
patent: 4533834 (1985-08-01), McCormack
patent: 4553031 (1985-11-01), Cholin et al.
patent: 4639598 (1987-01-01), Kern et al.
patent: 4665390 (1987-05-01), Kern et al.
patent: 4691196 (1987-09-01), Kern et al.
patent: 4701624 (1987-10-01), Kern et al.
patent: 4785292 (1988-11-01), Kern et al.

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