Apparatus and method to detect an intrusion point along a security fence
First Claim
1. A method of calibrating a system for detecting a location of a potential breach along a security fence, the method comprising the steps of:
- providing a fiber optic cable along the security fence, with a light transmission and reception device attached to one end of the fiber optic cable;
having a person move along the security fence;
having the person interrupt light traveling through the fiber optic cable at a certain position;
taking note of a ground distance between a reference point and the certain position;
sensing the interruption in the fiber optic cable at the light transmission and reception device;
determining an associated cable length existing between the light transmission and reception device and the interruption in the fiber optic cable; and
recording the ground distance and the associated cable length in a memory.
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Accused Products
Abstract
A monitoring system evaluates the integrity of a fiber optic cable, having a weave pattern and being attached to a security fence. To establish and calibrate the monitoring system, the present invention provides a system and method for establishing a look-up table to be stored in a memory. Any breakage in, bending of, or stress on the fiber optic cable is noted by the monitoring system by an alarm, and a length of cable between the monitoring system and the affected portion of the fiber optic cable is determined. The look-up table is indexed to determine a zone of potential breach. Further, an average weave density of the affected zone is computed, so that an approximate location of the potential breach within the affected zone, in terms of ground distance, can be accurately determined and displayed.
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Citations
20 Claims
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1. A method of calibrating a system for detecting a location of a potential breach along a security fence, the method comprising the steps of:
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providing a fiber optic cable along the security fence, with a light transmission and reception device attached to one end of the fiber optic cable;
having a person move along the security fence;
having the person interrupt light traveling through the fiber optic cable at a certain position;
taking note of a ground distance between a reference point and the certain position;
sensing the interruption in the fiber optic cable at the light transmission and reception device;
determining an associated cable length existing between the light transmission and reception device and the interruption in the fiber optic cable; and
recording the ground distance and the associated cable length in a memory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A calibration system for calibrating a monitoring system for detecting a location of a potential breach along a security fence, the calibration system comprising:
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a fiber optic cable ran along a security fence;
a light transmission and reception device attached to one end of said fiber optic cable;
a controller attached to said light transmission and reception device;
a first wireless communications device operated by a first person moving along the security fence, after the first person interrupts light traveling through said fiber optic cable at a certain position, said first wireless communications device transmitting a ground distance from a reference point to the certain position;
a second wireless communications device receiving the ground distance from said first wireless communications device; and
a memory connected to said controller, wherein said light transmission and reception device in cooperation with said controller determines an associated cable length existing between the light transmission and reception device and the interruption in the cable, and wherein said controller stores the ground distance and the associate cable length in said memory. - View Dependent Claims (14, 15, 16)
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17. An operating method for a security fence monitoring system comprising:
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constantly monitoring an output of a light transmission and reception device to determine a time delay of a light signal passing through a fiber optic cable attached to a security fence;
if the time delay varies outside of a threshold value, issuing an alarm signal, and converting the time delay provided by the transceiver into a cable length value;
comparing the cable length value to a lookup table stored in a memory;
determining a zone of a potential breach point; and
calculating an approximate location of the potential breach within the zone. - View Dependent Claims (18, 19, 20)
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Specification