Fibre optic based intrusion sensing system
First Claim
1. A fiber optic based intrusion sensing system comprising:
- at least two fiber optic cable parts buried in a shallow trench in the ground, side by side in a predetermined nonzero distance to each other, and at least one predetermined depths,at least one dynamic distributed fiber optic interrogator measuring a predetermined property related to a change in length of the at least two fiber optic cable parts; and
a control unit;
wherein each of the at least two fiber optic cable parts has one end connected to said at least one fiber optic interrogator and one of a free second end at the end of a monitored perimeter and the second end is also connected to said at least one fiber optic interrogator;
wherein the control unit is connected to all of said at least one fiber optic interrogator and adapted to analyze the measurements of said predetermined property and adapted to identify an object on a ground surface by combining simultaneous measurements of all fiber optic cable parts; and
wherein the control unit analyzes the measurements and identifies objects on the surface by combining the measurements of all of the at least two parallel fiber optic cable parts and performing mechanical inverse analysis in order to calculate dynamic contact forces acting between the object and the ground surface and using a calculated pattern of contact forces over time and correlate the pattern to a type of object on the ground surface, a location of the object on the monitored perimeter, a weight of the object, a speed of the object and a direction of the object.
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Accused Products
Abstract
A fiber optic based intrusion sensing system includes two or more fiber optic cables buried in a shallow trench in the ground, side by side in a predetermined nonzero distance to each other and at one or more predetermined depths. A dynamic distributed fiber optic interrogator measures a predetermined property related to a change in the length of the cables connected to it. A control unit is connected to all interrogators and analyzes the measurements of the predetermined property and identifies objects on the surface by combining the simultaneous measurements of all cables and correlating the measurements to the type of object on the ground surface, the location of the object on the perimeter, the weight, speed and direction of the object, particularly the direction in or out of the secured perimeter.
12 Citations
11 Claims
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1. A fiber optic based intrusion sensing system comprising:
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at least two fiber optic cable parts buried in a shallow trench in the ground, side by side in a predetermined nonzero distance to each other, and at least one predetermined depths, at least one dynamic distributed fiber optic interrogator measuring a predetermined property related to a change in length of the at least two fiber optic cable parts; and a control unit; wherein each of the at least two fiber optic cable parts has one end connected to said at least one fiber optic interrogator and one of a free second end at the end of a monitored perimeter and the second end is also connected to said at least one fiber optic interrogator; wherein the control unit is connected to all of said at least one fiber optic interrogator and adapted to analyze the measurements of said predetermined property and adapted to identify an object on a ground surface by combining simultaneous measurements of all fiber optic cable parts; and wherein the control unit analyzes the measurements and identifies objects on the surface by combining the measurements of all of the at least two parallel fiber optic cable parts and performing mechanical inverse analysis in order to calculate dynamic contact forces acting between the object and the ground surface and using a calculated pattern of contact forces over time and correlate the pattern to a type of object on the ground surface, a location of the object on the monitored perimeter, a weight of the object, a speed of the object and a direction of the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification