Infrared intrusion detection system

Details Infrared intrusion detection system Infrared intrusion detection system

1979-04-23

1981-03-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250342, 250353, 350299, G01D 2104

Patent

active

042582555

ABSTRACT:
A passive infrared intrusion detection system including a mirror assembly having an array of plane mirrors disposed at respective angular positions to provide a wide field of view. A parabolic mirror confronts the plane mirror array and is disposed with an infrared detecting element at its focal point. Radiation received in the field of view is directed by one or more of the plane mirrors to the parabolic mirror which focuses the received radiation onto the detecting element which provides an electrical signal which is processed to provide an alarm indication of intruder presence.

REFERENCES:
patent: 3958118 (1976-05-01), Schwarz

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