Method of detecting when an optical preform MCVD tube is completely closed

Method of detecting when an optical preform MCVD tube is completely closed

1. Field of the Invention A method of detecting a critical state of closing of a preform during a phase of closing of the preform following a phase of deposition of layers of material that reduce the radial size of an opening formed in the preform smaller in the radial direction comprises the steps...

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Hauptverfasser: Regnier, Jean-François, Orcel, Gérard
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Sprache:eng
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creator Regnier, Jean-François
Orcel, Gérard
description 1. Field of the Invention A method of detecting a critical state of closing of a preform during a phase of closing of the preform following a phase of deposition of layers of material that reduce the radial size of an opening formed in the preform smaller in the radial direction comprises the steps of injecting a gas into the opening, measuring a pressure in a pipe element through which the injected gas flows and detecting the critical state of closing of the optical preform on the basis of a measured pressure.
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title Method of detecting when an optical preform MCVD tube is completely closed
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