Patent ID: 6888461

Claim:
A fibre optic based security system, comprising: a length of optical fibre having two opposite ends and adapted to be looped about at least one object to be protected; and a portable casing comprising: a light emitter optically coupled to one of the opposite ends of said fibre for injecting light therein; a light detector optically coupled to the other of said opposite ends of the fibre for detecting a level of light transmitted by said fibre; threshold means connected to said light detector for determining if the level of light transmitted by the fibre is below a predetermined threshold level; a power source for powering said system; and an alarm operatively associated with said threshold means, said alarm being triggered when said level of light transmitted by said fibre falls below the threshold level; characterized in that said length of said optical fibre is such that when said fiber is looped about said object to be protected, said portable casing is placed at an area remote from said object and physically separated therefrom by a barrier, so that said casing is not accessible from an area where said object is located.