Flame detector for detecting phase difference in two different w

Details Flame detector for detecting phase difference in two different w Flame detector for detecting phase difference in two different w

1986-04-25

1988-05-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Flame light source

340578, G08B 1712

Patent

active

047422360

ABSTRACT:
A flame detector in which an infrared ray sensor having a specific infrared ray sensitivity and a visible ray sensor having a specific visible ray sensitivity are provided and output signals from both sensors are amplified by amplifiers, which in turn provide output signals to a phase discriminator circuit, the output signal from the amplifier for the infrared sensor output being also fed to a rectifier circuit for rectifying only a predetermined level or higher portion of the amplified output; an output signal from the rectifier circuit is fed to an integrator circuit and also fed to another integrator circuit through a switch which is opened when the output level of the phase discriminator circuit is "H"; then output signals from the integrator circuits are compared by a comparator and at the same time the output signal from said another integrator circuit is compared with a preset value by a comparator; and output signals from both comparators are fed to a control circuit which issues an alarm when the output levels of both comparators are "H".

REFERENCES:
patent: 3665440 (1972-05-01), McMenamin
patent: 3820097 (1974-06-01), Larson
patent: 3940753 (1976-02-01), Muller
patent: 4051375 (1977-09-01), Schuetz et al.
patent: 4404468 (1983-09-01), Kleinschmidt
patent: 4455487 (1984-06-01), Wendt
patent: 4553031 (1985-11-01), Cholin et al.
patent: 4603255 (1986-07-01), Henry et al.
patent: 4630684 (1986-12-01), Cinzori et al.

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