Optical transmission line enabling definition of a fault point a

Details Optical transmission line enabling definition of a fault point a Optical transmission line enabling definition of a fault point a

1995-08-18

1997-01-07

Healy, Brian

Optical waveguides

Optical waveguide sensor

385123, 385100, 356 731, G02B 600, G01N 2100

Patent

active

055925774

ABSTRACT:
In an optical transmission line enabling definition of a fault point thereon and a method for defining the fault point, the optical transmission line includes: a plurality of optical fiber units connected in series in longitudinal direction so as to form the optical transmission line; and each of the optical fiber units having fibers with different parameters. The fault point is defined by inputting pulsed light to one end of the optical transmission line, detecting the change in the intensity of reflected light which is caused by change in the power of back-scattered light based on the difference in the fiber parameters, obtaining a curve of a relationship between change of the intensity and distance scales of the optical transmission line, and representing the relationship on the curve, detecting discontinuous points of the intensity on the curve, each of the discontinuous points can be used as a distance marker in order to measure the distance from the end of the optical transmission line to the fault point.

REFERENCES:
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patent: 5066118 (1991-11-01), Buerli
patent: 5442434 (1995-08-01), Liao et al.
patent: 5450191 (1995-09-01), Parks et al.
patent: 5479251 (1995-12-01), Hanson

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