Compensated intruder-detection systems

Communications: electrical – Condition responsive indicating system – With particular system function

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340550, 340556, 340566, G08B 2900

Patent

active

044791135

ABSTRACT:
Intruder-detection systems in which intruder-induced signals are transmitted through a medium also receive spurious signals induced by changes in a climatic condition affecting the medium. To combat this, signals received from the detection medium are converted to a first signal. The system also provides a reference signal proportional to climate-induced changes in the medium. The first signal and the reference signal are combined for generating therefrom an output signal which is insensitive to the climatic changes in the medium. An alarm is energized if the output signal exceeds a preselected value. In one embodiment, an acoustic cable is coupled to a fence to generate a first electrical signal proportional to movements thereof. False alarms resulting from wind-induced movements of the fence (detection medium) are eliminated by providing an anemometer-driven voltage generator to provide a reference voltage proportional to the velocity of wind incident on the fence. An analog divider receives the first electrical signal and the reference signal as its numerator and denominator inputs, respectively, and generates therefrom an output signal which is insensitive to the wind-induced movements in the fence.

REFERENCES:
patent: 3902040 (1975-08-01), Ikeda et al.
patent: 4326199 (1982-04-01), Tarpley et al.
patent: 4420746 (1983-12-01), Malinowski
Intrusion Detection Systems, Inc., "All Weather, All Terrain, All Area Protection at a Sensible Cost", pp. 1-8, San Leandro, CA.
"Seismic Detection System Protects this Hard-to-Secure Facility", Security World XVI, 4, (Apr., 1978), pp. 28-29, 98, 100, Los Angeles, CA.

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