Two channel optical flame detector

Communications: electrical – Condition responsive indicating system – Specific condition

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Details

250339, 250554, 340600, G01J 100, G08B 2100

Patent

active

042064546

ABSTRACT:
A flame detector which is capable of discriminating between hydrocarbon fires and background radiation produced by the sun, artificial light or black body radiation. Two radiation sensors are provided, each being responsive to separate known radiation peaks produced by a hydrocarbon fire. Logic circuitry is provided which produces an alarm signal only when the radiation received by each sensor is above a predetermined value, and when the radiation received by one specified sensor is greater than the radiation received by the other sensor.

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patent: 4160163 (1979-07-01), Nakauchi
patent: 4160164 (1979-07-01), Nakauchi

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