Method of perimeter barrier monitoring and systems formed for that purpose
First Claim
1. A perimeter barrier system comprising:
- a barrier element;
a mounting for mounting the barrier element for intentional limited movement, the mounting having a biasing system for biasing the barrier element towards a first position, and wherein upon a disturbance of the barrier element caused by an attempt to breach the perimeter barrier system, the barrier element moves intentionally against the bias of the biasing system towards a second position;
a waveguide located in proximity to the barrier element;
a light source for launching light into the waveguide so that the light can travel through the waveguide;
a detector for detecting light which has traveled through the waveguide; and
wherein upon the disturbance, the barrier element moves towards the second position to cause a movement or loading of the waveguide which alters a parameter of the light traveling through the waveguide, and whereupon the detector detects the changing parameter of the light which has traveled through the waveguide to thereby provide an indication of an attempted breach of the perimeter barrier system.
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Accused Products
Abstract
A perimeter barrier system and method of monitoring a perimeter barrier are disclosed which comprise a perimeter barrier element in the form of a picket or fence panel which is mounted for limited movement by spring loading the barrier element by means of springs. An optical fiber is coupled to the barrier elements so that upon an attempt to breach the perimeter barrier system the barrier element is moved to in turn cause movement of the waveguide. A light source and detector is provided for launching light into the fiber and for detecting light which is passed through the fiber so that when the fiber is moved a parameter of the light is changed and that change in parameter is detected by detector to provide an indication of an attempt to breach the perimeter barrier system.
57 Citations
20 Claims
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1. A perimeter barrier system comprising:
a barrier element;
a mounting for mounting the barrier element for intentional limited movement, the mounting having a biasing system for biasing the barrier element towards a first position, and wherein upon a disturbance of the barrier element caused by an attempt to breach the perimeter barrier system, the barrier element moves intentionally against the bias of the biasing system towards a second position;
a waveguide located in proximity to the barrier element;
a light source for launching light into the waveguide so that the light can travel through the waveguide;
a detector for detecting light which has traveled through the waveguide; and
wherein upon the disturbance, the barrier element moves towards the second position to cause a movement or loading of the waveguide which alters a parameter of the light traveling through the waveguide, and whereupon the detector detects the changing parameter of the light which has traveled through the waveguide to thereby provide an indication of an attempted breach of the perimeter barrier system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of monitoring a perimeter barrier system to determine an attempt to breach the perimeter barrier system, comprising:
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mounting barrier elements of the perimeter barrier system for intentional limited movement against the bias of a biasing system;
providing a waveguide in proximity to the barrier elements so that movement of the barrier elements upon an attempt to breach the barrier element causes movement or loading of the waveguide;
detecting light which is passed through the waveguide; and
processing the detected light to determine whether there is a change in parameter of the light indicative of movement of the waveguide which in turn is indicative of movement of one of the barrier elements to thereby provide an indication of an attempted breach of the perimeter barrier system. - View Dependent Claims (18, 19, 20)
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Specification