Scan type fire detecting apparatus

Details Scan type fire detecting apparatus Scan type fire detecting apparatus

1995-08-02

1998-03-10

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, G08B 1712

Patent

active

057264511

ABSTRACT:
A scan type fire detecting apparatus is provided with a scanning unit which stepwise scans a monitoring area in a horizontal direction and vertically scans at each step of the horizontal scan to output a detecting signal obtained during the vertical and horizontal scan while a fire judging section judges an occurrence of a fire based on the detecting signal from the scanning unit. The fire judging section includes a first fire judging section which judges as to whether or not the detecting signal outputted from the scanning unit during the vertical and horizontal scanning is higher than a predetermined threshold value, and stops the horizontal scan of the scanning unit when the detecting signal is higher than the predetermined threshold value. A second fire judging section vertically scans the scanning area at the horizontal stop position, determined by the first fire judging section, and analyzes a frequency of the detecting signal detected through the vertical scan to judge whether or not the detecting signal is on the basis of a fluctuation of a flame, to thereby determine an occurrence of a fire when it is judged that the detecting signal is on the frequency of the fluctuation of a flame.

REFERENCES:
patent: 4671362 (1987-06-01), Odashima
patent: 4749862 (1988-06-01), Yoshida et al.
patent: 4800285 (1989-01-01), Akiba et al.

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