| 摘要 |
An antitheft device for cables or the like, particularly cables laid in cable ducts or the like, comprising at least one fiber-optic cable laid along at least one cable or cable bundle, said fiber-optic cable being attached to said cable and/or said cable bundle at least at one point over the length of said cable or said cable bundle, or said fiber-optic cable is attached to said cable or said cable bundle in continuous fashion over the entire length of said cable or cable bundle, whereas said fiber-optic cable has two opposite ends, i.e. one input end for a predetermined light signal and one output end for said light signal, means being provided for determining the changes of at least a few characteristic parameters of said actually received light signal as compared with the nominal reference values of said characteristic parameters of the light signal, which are or can be stored in said processing/comparing unit, said processing/comparing unit triggering alarm warning means when the actual values of said characteristic parameters of the received light signal deviate from the nominal reference values of said characteristic values beyond a given tolerance. |
