Apparatus and method for detecting optical fiber fault location

Details Apparatus and method for detecting optical fiber fault location Apparatus and method for detecting optical fiber fault location

1997-08-20

1999-10-12

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 731, G01N 2100

Patent

active

059658762

ABSTRACT:
A method and apparatus for detecting a fault, such as a break or crack in a fiber optic cable. A test device transmits into a first end of fiber bundle under test a first pulse of optical energy. The time duration and/or intensity of the pulse propagating through the fiber after being reflected back through the fiber are determined and stored in memory. At a later point in time this step is repeated with a second pulse. If the propagation time and/or intensity of the second pulse varies by greater than a predetermined amount from that of the first pulse an alarm condition is indicated. From the propagation time of the second pulse a length is calculated and provided to the user. This length corresponds to the location of the fault.

REFERENCES:
patent: 5069544 (1991-12-01), Buerli
patent: 5453827 (1995-09-01), Lee
patent: 5500730 (1996-03-01), Johnson

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