System for amplifying all frequencies detected from a flame dete

Details System for amplifying all frequencies detected from a flame dete System for amplifying all frequencies detected from a flame dete

1983-10-26

1986-05-27

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Flame light source

250214A, 328 6, 340578, 431 79, G08B 1712

Patent

active

045917256

ABSTRACT:
A fail-safe, self-checking flame monitoring circuit is provided without the use of a mechanical shutter in which a photodetector provides a signal corresponding to flame intensity (including flicker), an amplifier amplifies the signal, the amplification is controlled by a negative feedback circuit in relation to the peak amplitude of the signal (including flicker) such that all frequencies down to DC are amplified equally, and all amplified signals are passed, without threshold, downstream for further processing.

REFERENCES:
patent: 3995221 (1976-11-01), MacDonald
patent: 4370557 (1983-01-01), Axmark et al.
patent: 4395638 (1983-07-01), Cade

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