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Fiber optic based security system

  • US 20020130776A1
  • Filed: 03/11/2002
  • Published: 09/19/2002
  • Est. Priority Date: 03/13/2001
  • Status: Active Grant
First Claim
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1. A fibre optic based security system, comprising:

  • a length of optical fibre having two opposite ends;

    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.

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