Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-05-08
1980-06-03
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
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: 3539804 (1970-11-01), Billetdeaux et al.
patent: 3716717 (1973-02-01), Scheidweiler et al.
patent: 3931521 (1976-01-01), Cinzori
patent: 3967255 (1976-06-01), Oliver et al.
patent: 4101767 (1978-07-01), Lennington et al.
patent: 4160163 (1979-07-01), Nakauchi
patent: 4160164 (1979-07-01), Nakauchi
Schapira Sergiu
Tufts Howard L.
Caldwell Sr. John W.
Chloride Incorporated
Nowicki Joseph E.
Ross Robert E.
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