Passive infrared room intrusion detector

Details Passive infrared room intrusion detector Passive infrared room intrusion detector

1975-08-18

1976-05-04

Swann, III, Glen R.

Communications: electrical

Systems

Call station

250221, 340276, G08B 1318

Patent

active

039551849

ABSTRACT:
An intrusion system detects changes in background radiation received from a plurality of orthogonally arranged fields of view (FOV) which preferably are defined by thin polyhedrons coextensive with the walls of the room. These fields of view are generated by a plurality of orthogonally arranged optical reflectors located in certain corners of the room, and any changes in background radiation within these fields of view are detected by one or more thermopile detectors which are optically aligned with the above optical reflectors. The low level - low frequency output signal voltages form the thermopile detectors are converted to an AC signal and amplified for use as an intrusion alarm signal.

REFERENCES:
patent: 3476948 (1969-11-01), Mengers
patent: 3524180 (1970-08-01), Cruse
patent: 3703718 (1972-11-01), Berman
patent: 3863239 (1975-01-01), Campman

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