Apparatus for controlling deployment of a cable
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United States of America Patent
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Nov 3, 1992
Issued Date -
N/A
app pub date -
Sep 9, 1991
filing date -
Oct 7, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of installing a cable, particularly but not exclusively in a duct filled with flowing liquid, wherein, as the cable is deployed, the strain in the cable is determined by sending a signal down the cable and receiving a signal back from the cable. The speed of deployment is adjusted according to the strain detected. Preferably the system is applied to optical cables, and a radio frequency signal is modulated on an optical carrier. Optical connection to the cable on the rotating drum is made via an optical slip-ring. The front end of the cable has a silvered end termination for reflecting the modulated signal back along the fibre to be detected by an optical receiver, and there is a vector voltmeter for determining the phased difference between the signals to thus determine the strain in the cable.
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