Glass manufacturing – Processes of manufacturing fibers – filaments – or preforms – With measuring – controlling – sensing – programming – timing,...
Reexamination Certificate
2011-04-12
2011-04-12
Daniels, Matthew J (Department: 1741)
Glass manufacturing
Processes of manufacturing fibers, filaments, or preforms
With measuring, controlling, sensing, programming, timing,...
C065S484000, C065S385000, C065S413000, C065S421000
Reexamination Certificate
active
07921673
ABSTRACT:
An apparatus for measuring the weight of a preform for optical fibers during a chemical deposition process for the formation of a preform is disclosed. The apparatus has at least one elastic constraint associated with at least one end portion of an elongated element made of a chemical deposition substrate for the formation of the preform, a device for inducing an oscillation, for example axial, on said elongated element, a device for detecting the frequency of oscillation of said elongated element, and a device for calculating the weight of the preform according to the detected frequency of oscillation. Advantageously, the device allows the realisation of a method for measuring the weight of the preform wherein the errors in measurement caused by thermal drift effects, by the axial distribution of the masses on the preform and by loads which are different from the mass of the preform in formation are reduced to below the required precision in measurement.
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Demergazzi Andrea
Ruzzier Marco
Sarchi Davide
Belyaev Yana
Daniels Matthew J
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Prysmian Cavi E Sistemi Energia S.r.l.
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