Method of measuring the twist imparted to an optical fibre and procedure for processing an optical fibre using this method
US6837074B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 2002 |
| Grant date | Jan 4, 2005 |
| Priority date | — |
| Expiry date | Feb 23, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B2205/40
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.