Apparatus and method for fiber optic intrusion sensing
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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.
Taylor, Henry F.; Lee, Chung E. (1993). Apparatus and method for fiber optic intrusion sensing. United States. Patent and Trademark Office; Texas A&M University. Libraries. Available electronically from