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US 12,111,189 B2Granted
Object localization and threat classification for optical cable protection
AssigneeNEC Corporation
InventorsMing-Fang Huang, Ting Wang, Shaobo Han
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Abstract
Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously identify location(s) of construction—or other activities—taking place along fiber optic cable routes that can damage the fiber optic cables.
Claims7
A method of operating a distributed optical fiber sensing system for object localization and threat classification for optical cable protection and early warning, said system comprising:
- a length of optical fiber;
- and
- a distributed optical fiber sensing interrogator in optical communication with the length of optical fiber;
- said method comprising:
- operating the distributed optical fiber sensing interrogator and detecting, at a detection point along the length of the optical fiber, vibrations produced by a vibration source;
- and
- determining, a directional movement of the vibration source relative to the detection point by comparing a cut-off vibrational frequency produced by the vibration source at a first time t1 and cut-off vibrational frequency produced by the vibration source at a second time t2;
- wherein the cut-off vibrational frequency produced by the vibration source is greater when the vibration source is physically closer to the detection point and a higher vibrational frequency is observed as compared to when the vibration source physically further away from the detection point and a lower vibrational frequency is observed.
5 more elements
Dependencies are inferred from the claim text.