FAULT-TOLERANT DISTRIBUTED FIBER OPTIC INTRUSION DETECTION
First Claim
1. An intrusion detection system for monitoring a premises comprising:
- at least one optical cable that extends about the premises, the at least one optical cable comprising at least one optical fiber having a first end opposite a second end; and
optical time domain reflectometry means, operably coupled to the first and second ends of the at least one optical fiber, comprising first signal processing circuitry that analyzes the backscatter signal received via the first end of the at least one optical fiber in order to detect an intrusion of the premises, and second signal processing circuitry that analyzes the backscatter signal received via the second end of the at least one optical fiber in order to detect an intrusion of the premises.
1 Assignment
0 Petitions
Accused Products
Abstract
An intrusion detection system for monitoring a premises includes at least one optical cable that houses at least one optical fiber and extends about the premises. Optical time domain reflectometry (OTDR) means is operably coupled to opposite first and second ends of the at least one optical fiber. The OTDR means includes first signal processing circuitry that analyzes the backscatter signal received via the first end of the at least one optical fiber in order to detect an intrusion of the premises, and second signal processing circuitry that analyzes the backscatter signal received via the second end of the at least one optical fiber in order to detect an intrusion of the premises. The redundancy of intrusions decisions made by the first and second signal processing circuitry can be verified. The system preferably further includes means for detecting a break in the at least one fiber, for identifying location of the break, for outputting to a user the location of the break, and for raising an alarm indicating the break.
36 Citations
25 Claims
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1. An intrusion detection system for monitoring a premises comprising:
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at least one optical cable that extends about the premises, the at least one optical cable comprising at least one optical fiber having a first end opposite a second end; and optical time domain reflectometry means, operably coupled to the first and second ends of the at least one optical fiber, comprising first signal processing circuitry that analyzes the backscatter signal received via the first end of the at least one optical fiber in order to detect an intrusion of the premises, and second signal processing circuitry that analyzes the backscatter signal received via the second end of the at least one optical fiber in order to detect an intrusion of the premises. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of detecting intrusion of a premises comprising:
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providing at least one optical cable that extends about the premises, the at least one optical cable comprising at least one optical fiber having a first end opposite a second end; and coupling optical time domain reflectometry means to the first and second ends of the at least one optical fiber; and using the optical time domain reflectometry means to analyze the backscatter signal received via the first end of the at least one optical fiber and to analyze the backscatter signal received via the second end of the at least one optical fiber in order to detect an intrusion of the premises. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification