Passive infrared intruder detection system

Details Passive infrared intruder detection system Passive infrared intruder detection system

1979-05-04

1980-12-30

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

250342, 340506, 340508, 340512, 340600, G08B 1318, G08B 2900

Patent

active

042426693

ABSTRACT:
Radiation detection apparatus is disclosed including a first detector (6) for detecting radiation at a wavelength which is preferably in the infra-red region, and a device for sensing the presence of an obturating element (11), which element acts to prevent operation of the first detector. The sensing means includes a transmitter (14) which transmits a signal at a second wavelength, and a second detector (15) responsive to and arranged to receive the signal in the presence of the obturating element, preferably by reflection of the signal from the element. An alarm (10) may be activated in response to detection of radiation or of the transmitted signal.

REFERENCES:
patent: 3703718 (1972-11-01), Berman
patent: 3928843 (1975-12-01), Sprout et al.
patent: 4119949 (1978-10-01), Lindgren

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