Fence protection system

Details Fence protection system Fence protection system

1974-07-01

1976-03-30

Trafton, David L.

Communications: electrical

Systems

Call station

340258D, G08B 1302

Patent

active

039478351

ABSTRACT:
This fence protection system comprises an elongated electret cable for sensing vibrations on a fence and an electronic processing circuit connected to the cable for discriminating against spurious signals such as those caused by raindrops on the fence and nuisance signals produced by stick dragging on the fence. This circuit comprises a charge amplifier connected directly to the cable transducer and series connected burst width and interburst discriminators in conjunction with parallel connected pulse counter and integrator means feeding an alarm mechanism through an OR gate; signals produced by an intruder climbing or cutting the fence are distinguished from spurious raindrop and stick dragging signals and produce and alarm.

REFERENCES:
patent: 3696369 (1972-10-01), Laymon et al.
patent: 3717864 (1973-02-01), Cook et al.
patent: 3750127 (1973-07-01), Ayers et al.

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