G - Physics – 08 – B
Patent
G - Physics
08
B
340/125
G08B 13/22 (2006.01) G08B 13/12 (2006.01)
Patent
CA 1276256
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 the 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.
542193
Harald Seifert
Ktv Sicherheitstechmik Gmbh
Ktv-Systemtechnik Gmbh
Pascal & Associates
Shorrock Limited
LandOfFree
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