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Title
Überwachungs- und Schutzeinrichtung von Lichtwellenleiter
Date Issued
1994
Author(s)
Onkels, E.
Ruehl, F.
Patent No
1993-4314031
Abstract
The invention relates to a monitoring and protection device for optical fibre cables to record an energy leak from an optical fibre cable or an optical fibre as the result of a fault. Damage to optical fibre cables is caused by uncontrolled coupling-out of laser beams at fault points along the optical fibres, e.g., due to a slight excess of the permissible banding radius. In the device according to the invention, the optical fibre cable is designed in such a way that it has one or several optical fibres with one or several fibre coatings, by which at least one fibre coating is foreseen for transmitting the radiation power, and that the loss radiation emanating from the fibre coatings transmitting the radiation power is injected into a second fibre coating by elastic or inelastic scattering (conversion) and is routed to a detector. The loss radiation is converted by a suitable preparation of the secondary coatings, e.g., by enriching with scattering bodies, dyes or scintillators. In the simplest case, the optical fibre cable is surrounded by a protective sheath which is filled with a liquid or gel-type dye or scintillator carrier. The device according to the invention has the advantage that a fault in the optical fibre cable is detected at an early stage in order to prevent severe damage or total destruction of the optical fibre by power reduction or shut-down of the...
Language
de
Institute
Patenprio
DE 1993-4314031 A: 19930429