Method of measuring the twist imparted to an optical fibre...

Details Method of measuring the twist imparted to an optical fibre... Method of measuring the twist imparted to an optical fibre...

2005-01-04

2005-01-04

Griffin, Steven P. (Department: 1731)

Glass manufacturing

Processes of manufacturing fibers, filaments, or preforms

With measuring, controlling, sensing, programming, timing,...

C065S402000, C065S435000, C065S438000, C065S443000, C065S447000

Reexamination Certificate

active

06837074

ABSTRACT:
A method of measuring the twist imparted to an optical fibre includes the steps of advancing the optical fibre in a predetermined direction and at a predetermined velocity, imparting to the optical fibre, during the step of advancing, a twist about its axis, measuring the diameter of the optical fibre during the step of advancing, to generate a time-based signal indicating the diameter, and processing this signal to find a value indicating the imparted twist. The step of processing includes the principal steps of transforming in the frequency domain the signal relating to the measurement of the diameter, calculating the power spectrum of the signal thus obtained, distinguishing in this power spectrum the signal peaks correlated with the imparted twist, determining the maximum frequency associated with these signal peaks, and dividing the value of this maximum frequency by the value of the velocity of advance of the fibre to find the value indicating the imparted twist.

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