Infrared intruder detection system

Details Infrared intruder detection system Infrared intruder detection system

1986-04-08

1987-11-03

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250349, G01J 518

Patent

active

047045337

ABSTRACT:
An infrared intruder detection system has two separate channels A and B. Each channel has its own pyroelectric detector device and threshold level comparator. The comparator is responsive to dual polarity pyroelectric voltage outputs produced by the associated detector device as a result of an intruder-related infrared image moving thereacross. A logic circuit analyzes the comparator outputs and responds to the identification of particular intruder-indicative sequences of comparator outputs in both channels to generate an alarm and/or switching output. The logic circuit may also identify shock-induced comparator outputs. The system offers a high intruder detection capability with immunity from false triggering.

REFERENCES:
patent: 4342987 (1982-08-01), Rossin
patent: 4364030 (1982-12-01), Rossin
patent: 4570157 (1986-02-01), Kodaira
patent: 4614938 (1986-09-01), Weitman
patent: 4618854 (1986-10-01), Miyake et al.

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