Infrared human detector not barred by an intervening obstruction

Details Infrared human detector not barred by an intervening obstruction Infrared human detector not barred by an intervening obstruction

1994-12-06

1996-02-06

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

2503381, 250340, 250DIG1, G08B 13193, G08B 2900

Patent

active

054898927

ABSTRACT:
An intruder detection system for senses infrared radiated by an intruder through a window-pane and detecting the intrusion through the reception of an output from the infrared sensors. The system includes a light emitter for projecting infrared rays toward a detection area and a light acceptor for receiving at least part of the infrared rays projected by the light emitter through an obstruction detection optical path. The light emitter and the light acceptor are located on opposite sides of the window-pane.

REFERENCES:
patent: 4242669 (1980-12-01), Crick
patent: 5091648 (1992-02-01), Owers et al.

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