Intrusion detecting system with polarization dependent sensing elements
First Claim
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1. A detection system comprising:
- (i) a length of optical fiber; and
(iii) an OTDR coupled to said fiber, said OTDR comprising (a) a radiation source providing pulsed radiation to said fiber, (b) a detector detecting radiation that is backscattered through the fiber, and (c) a processor capable of analyzing the variation of the radiation that is backscattered through the fiber;
wherein at least two polarization dependent sensing elements are positioned along the length of optical fiber.
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Abstract
A detection system includes a length of optical fiber and an OTDR coupled to the optical fiber. The OTDR includes a radiation source providing pulsed radiation to the fiber, a detector detecting radiation that is backscattered through the fiber, and a processor capable of analyzing the variation of the radiation that is backscattered through the fiber. At least two polarization dependent sensing elements are positioned along the length of optical fiber.
6 Citations
20 Claims
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1. A detection system comprising:
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(i) a length of optical fiber; and (iii) an OTDR coupled to said fiber, said OTDR comprising (a) a radiation source providing pulsed radiation to said fiber, (b) a detector detecting radiation that is backscattered through the fiber, and (c) a processor capable of analyzing the variation of the radiation that is backscattered through the fiber;
wherein at least two polarization dependent sensing elements are positioned along the length of optical fiber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for detecting a disturbance along a length of optical fiber comprising the steps of:
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(i) emitting pulsed radiation into a length of optical fiber; (ii) measuring radiation that is backscattered through the optical fiber; and (iii) analyzing the variation of said measured radiation to produce information related to change in said measured radiation over time along the length of the fiber;
wherein at least two polarization dependent sensing elements are positioned along the length of optical fiber. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification