Infrared intrusion detector

Details Infrared intrusion detector Infrared intrusion detector

1990-01-24

1991-11-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250342, G01V 904

Patent

active

050668552

ABSTRACT:
An improved infrared intrusion detector is provided which conveniently and expeditiously monitors two fields of view by use of a single sensor. In a preferred embodiment, the improved intrusion detector monitors fields of views which are substantially orthogonal in a nonobvious manner. It is nonobvious in that an aperture is provided in a housing which permits radiation from a second field of view to enter the housing. Internal optical elements are provided to direct this incident radiation from the second field of view onto a sensor used for the first field of view. The internal optical elements are protected from the environment and do not give advance warning that a second field of view is monitored. Generally, the second field of view is below the intrusion detector to detect unauthorized activity in a dead zone below the detector.

REFERENCES:
patent: 4644147 (1987-02-01), Zublin
patent: 4644164 (1987-02-01), Mudge
patent: 4752769 (1988-06-01), Knaup et al.
patent: 4841284 (1989-06-01), Biersdorf

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