Monitoring a fiber optic cable for intrusion using a weighted algorithm
First Claim
1. A method for monitoring an optical fiber for changes in a monitor signal transmitted along the fiber caused when the fiber is subjected to vibration, motion, or handling that would be typical of an intrusion attempt and for triggering an alarm condition in response thereto comprising:
- transmitting the monitoring signal along the fiber;
using one or more sensors to detect disturbance events of changes in the monitor signal transmitted along the fiber caused when the fiber is subjected to vibration, motion, or handling that would be typical of an intrusion attempt;
wherein the sensor emits data on each disturbance event including the existence of the disturbance event and a value associated with the disturbance event dependent on an intensity of the disturbance;
and using an algorithm in a processor to analyze the disturbance events to determine when the alarm signal should be triggered;
wherein the algorithm;
calculates for each event a score dependent on the presence of the event and the value associated with the event;
generates a summation of the scores;
and when the summation of the scores exceeds a predetermined threshold within a predetermined time period, the processor emits a signal triggering the alarm condition.
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Abstract
An optical fiber is monitored for changes in a monitor signal caused when the fiber is subjected to vibration, motion, or handling typical of an intrusion attempt and for triggering an alarm condition in response by one or more sensors. The sensor emits data on each disturbance event including the existence of the disturbance event and a value associated with the disturbance event dependent on an intensity of the disturbance. The arrangement herein provides an algorithm to analyze the disturbance events which calculates for each event a score dependent on the presence of the event and the value associated with the event, generates a summation of the scores in a FIFO and when the summation of the scores exceeds a predetermined threshold within a predetermined time period, the processor emits a signal triggering the alarm condition.
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Citations
16 Claims
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1. A method for monitoring an optical fiber for changes in a monitor signal transmitted along the fiber caused when the fiber is subjected to vibration, motion, or handling that would be typical of an intrusion attempt and for triggering an alarm condition in response thereto comprising:
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transmitting the monitoring signal along the fiber; using one or more sensors to detect disturbance events of changes in the monitor signal transmitted along the fiber caused when the fiber is subjected to vibration, motion, or handling that would be typical of an intrusion attempt; wherein the sensor emits data on each disturbance event including the existence of the disturbance event and a value associated with the disturbance event dependent on an intensity of the disturbance; and using an algorithm in a processor to analyze the disturbance events to determine when the alarm signal should be triggered; wherein the algorithm; calculates for each event a score dependent on the presence of the event and the value associated with the event; generates a summation of the scores; and when the summation of the scores exceeds a predetermined threshold within a predetermined time period, the processor emits a signal triggering the alarm condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification