Fault detecting intrusion detection device

Details Fault detecting intrusion detection device Fault detecting intrusion detection device

1986-08-05

1987-12-01

Tarcza, Thomas H.

Communications: electrical

Condition responsive indicating system

With particular system function

340523, G08B 1900, G08B 2300

Patent

active

047107502

ABSTRACT:
In an improved intrusion detection device system of the dual-sensor type, wherein one sensor is a PIR sensor and the other is a microwave sensor, the improvement comprises counting the detection of intrusion separately by the microwave sensor and by the passive infrared sensor. Thereafter, the counts by the two separate detectors are compared and an indication is given if the number exceeds a certain user selectable threshold, to indicate fault in one of the two sensor subsystems.

REFERENCES:
patent: 3074053 (1963-01-01), McDonough et al.
patent: 3448449 (1969-06-01), Schulz et al.
patent: 3725888 (1973-04-01), Solomon
patent: 3801978 (1974-04-01), Gershberg et al.
patent: 4222041 (1980-09-01), Von Tomkewitsch
patent: 4401976 (1983-08-01), Stadelmayr
patent: 4611197 (1986-09-01), Sansky
patent: 4625199 (1986-11-01), Pantus

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