Analog-type fire detector

Details Analog-type fire detector Analog-type fire detector

1984-11-19

1986-10-07

Wan, Gene

Radiant energy

Photocells; circuits and apparatus

Flame light source

431 24, G06K 710

Patent

active

046161384

ABSTRACT:
An analog-type fire detector for detecting, in the form of an analog amount, a change in physical phenomena caused by occurrence of a fire, which intermittently detects a change in the ambient physical phenomena caused by occurrence of a fire, generates an analog signal corresponding to an amount of the change, converts the analog signal into a pulse signal of a duration corresponding to the level of the signal, generates periodically from a reference pulse generating means a reference pulse of a predetermined duration, detects by a discriminating means a difference in pulse durations between the output signal from the pulse duration converting means and the reference pulse, charges or discharges a capacitor corresponding to the difference detected, and hold-outputs for a predetermined period by a hold-outputs means a signal corresponding to a voltage across the capacitor at the time when the charging or discharging is stopped.

REFERENCES:
patent: 4381455 (1983-04-01), Komori

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