Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1981-05-19
1984-05-22
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340531, 340550, 340555, 340564, 350 9633, 356 731, 356237, 250227, 250572, 455606, 455610, G08B 2900, G08B 1300
Patent
active
044504349
ABSTRACT:
An improved intrusion detection apparatus for detecting when a fence is cut r has been climbed over, as well as the location of the intrusion. A cable comprising at least one optical fiber having an electrical transmission line running therealong is strung along the fence to be protected. If an intruder either cuts the cable or stresses the fence so that the cable breaks, an optical signal running along the optical fiber or fibers is lost, thus providing an alarm indication at a central station. The loss of the optical signal automatically triggers an electrical pulse generator means which feeds pulses down the transmission line running along the optical fiber. Part of the pulse energy is reflected at the transmission line break, and the time elapsed between transmission and receipt of the pulses is determined by time domain reflectometry techniques (TDR).
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McCormack Ray G.
Nielsen Paul H.
Crosland Donnie L.
Hollis Darrell E.
The United States of America as represented by the Secretary of
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