Fire detector utilizing two bandwidths of radiation

Details Fire detector utilizing two bandwidths of radiation Fire detector utilizing two bandwidths of radiation

1977-03-22

1978-10-10

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340600, G08B 1712

Patent

active

041199499

ABSTRACT:
An optical fire detector has a radiation-emitting means which emits a beam of radiation which, after passing through an intermediate air-medium is received by a radiation detecting means for providing an alarm upon an obscuration of the beam or radiation. The radiation-detecting means has first means for individually measuring the intensity in a first and a second wave-length band of the beam of radiation and second means for comparing the invididually measured intensities to provide the alarm upon a predetermined difference between such intensities.

REFERENCES:
patent: 3643093 (1972-02-01), Dietz
patent: 3799672 (1974-03-01), Vurek
patent: 3846772 (1974-11-01), Peberdy

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