Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1991-07-29
1993-03-16
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340541, 340600, 340666, G08B 1310, G08B 1318
Patent
active
051948478
ABSTRACT:
Apparatus for sensing intrusion into a predefined perimeter comprises means for producing a coherent pulsed light, which is injected into an optical sensing fiber having a first predetermined length and positioned along the predefined perimeter. A backscattered light in response to receiving the coherent light pulses is produced and coupled into an optical receiving fiber. The backscattered light is detected by a photodetector and a signal indicative of the backscattered light is produced. An intrusion is detectable from the produced signal as indicated by a change in the backscattered light. To increase the sensitivity of the apparatus, a reference fiber and an interferometer may also be employed.
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Griffiths, Garry D. "Fiber-Optic Sensors, Systems and Applications in Physical Security" Pilkington PE Limited Sales Article.
Lee Chung E.
Taylor Henry F.
Swann III Glen R.
Texas A & M University System
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