Position:Sea cable breakdown is very big to social influence, because of this breakdown must as far as possible fast rehabilitate, want to accomplish this, trouble spot must locate well and truly quickly, but once sea cable system malfunctions, in boundless and indistinct sea, from be as deep as hundreds of meters, a diameter is salvaged to be less than the sea cable of 10cm on thousands of meters seabed even, scoop up a needle like commensurate sea, consequently the fixed position of sea cable breakdown and maintenance have very strong specific characteristics.
A lot of original application at terrestrial cable defend test method already no longer applicable. Maintain in sea cable, in defending whole process, the measurement that breakdown nods and spot of sea cable trouble locate accurately is crucial technology. The fixed position of breakdown has two content: It is the distance; that checks place of sea cable breakdown from bank end 2 it is to be in maritime to breakdown the dot undertakes essence of life decides.
The measurement that breakdown of 1. sea cable nods
The exploration method that sea cable breakdown chooses is very much, commonly used methodological bright time domain reflexes appearance (OTDR) test law, voltage test law, capacitance test law, frequency test law and law of test of route supervisory system.
(1)OTDR tests a standard
Smooth time domain reflexes appearance (OTDR) is measured through sending smooth pulse to enter fiber-optic, because get the scattering of scattering particle, or encounter fiber-optic rupture the face produces Feinieer to reflex, use segregator of beam of light to carry reflex of among them phenanthrene Nie Er and Rayleigh on the back send receiver to scattering light, the change that become telegraphic name again and follows time shows on oscillograph. This kind of method although precision is tall, but the terminus that can check to be carried from sea cable bank only or only then station (cable of sea of the following abbreviation stands) to the first the road of sea cabled yarn between smooth repeater, or it is not to have relay paragraph sea cable paragraph.
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