Security fence with security wires fastened to posts via sensors

Details Security fence with security wires fastened to posts via sensors Security fence with security wires fastened to posts via sensors

1987-07-10

1989-02-07

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340541, G08B 1312

Patent

active

048034681

ABSTRACT:
A security fence, in which contact sensors produce corresponding signals when the security wires are touched. Each sensor is attached to two low-pass filters, the cutoff frequency of one filter being above, and below the cutoff frequency of the other filter being below the frequency spectrum of a sensor signal which occurs when the wire is deflected by a person. The output signals of the low-pass filters are subtracted in a subtraction circuit. If the subtracted output signal of the subtraction circuit exceeds a predetermined threshold, an alarm signal is released. Deflections of the wire due to other circumstances and, therefore being in another frequency spectrum do not result in the alarm being released.

REFERENCES:
patent: 3803548 (1974-04-01), Skujins, Jr.
patent: 3947835 (1976-03-01), Laymon
patent: 4306228 (1981-12-01), Meyer
patent: 4307387 (1981-12-01), Baxendale
patent: 4365239 (1982-12-01), Mongeon

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