Dual technology intruder detection system

Details Dual technology intruder detection system Dual technology intruder detection system

1985-12-16

1987-04-21

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340506, 340521, 340552, 340554, 340561, 367 94, G08B 1900, G08B 1318

Patent

active

046600248

ABSTRACT:
A dual-tech intruder detection system includes a pair of intruder-detecting subsystems, each functioning to detect intrusion by a technology different from the other, and apparatus for activating an alarm in response to both subsystems detecting intrusion within a predetermined time interval. A supervisory circuit serves to detect a malfunction in one of the subsystems. Default apparatus, responsive to the output of the supervisory circuit, causes the alarm activating apparatus to activate an alarm in response to the still functioning subsystem's detection of intrusion.

REFERENCES:
patent: 3801978 (1974-04-01), Gershberg et al.
patent: 4405919 (1983-09-01), Scheidweiler

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