Contrast smoke detector

Details Contrast smoke detector Contrast smoke detector

1982-02-16

1986-09-30

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

250573, 250574, 250575, 340630, 358107, 356336, 356343, 356435, 356438, 356439, H04N 718, G08B 1710

Patent

active

046149686

ABSTRACT:
A system for detection of smoke by measuring changes in the contrast of a multi-contrast target disposed remotely from a photoelectric sensor. The obscuration of the detection path causes a reduction in the contrast of the sensed target, and a change of predetermined magnitude is employed to trigger an alarm. The target has one or more relatively darker and one or more relatively lighter areas which are viewed by the sensor. The sensor can be composed of a plurality of photosensors each viewing a respective area of the target. Or, the sensor can be a single scanning sensor such as a video camera. Only a single line or segment of a line of the video frame pattern need be employed to monitor the target. The video camera can be employed on a shared basis for providing smoke monitoring and detection, together with other functions, such as intrusion detection, access control, or visual surveillance of an area.

REFERENCES:
patent: 2198971 (1940-04-01), Neufeld
patent: 3376425 (1968-04-01), Kraus
patent: 3446979 (1969-05-01), Ricciardi
patent: 3672781 (1972-06-01), Rosenblum
patent: 3931462 (1976-01-01), Exton
patent: 4081830 (1978-03-01), Mick
patent: 4257063 (1981-03-01), Loughry

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