Fault detecting intrusion detection device

Details Fault detecting intrusion detection device Fault detecting intrusion detection device

G - Physics

08

B

340/102

G08B 29/00 (2006.01) G08B 13/19 (2006.01) G08B 13/24 (2006.01) G08B 29/18 (2006.01)

Patent

CA 1264832

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.

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