THORLABS vytran GPX3800, Руководство пользователя

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GPX3800 and GPX3850 Glass Processors Chapter 5: Operation
Rev B, July 24, 2018 Page 45
Argon Flow
The argon flow rate will depend on the filament used and the power delivered to the filament. Use a constant
argon flow rate during all stages.
Defining Overall Elongation - Stages
To determine the amount of elongation required to achieve a desired fiber diameter for the taper, use the “Biconic
Taper Diameter Estimator” to determine the final fiber diameter for a given set of starting parameters. First,
determine the total elongation required to achieve a target diameter and subdivide that value for an equal number
of stages. For example if the total elongation required is estimated to be 12.0 mm, 4 stages with an elongation of
3.0 mm each is one possible process. Elongation is measured by the distance moved by one fiber holding block,
and therefore the actual total elongation is twice that value (i.e. Elong
Act
= Elong
Left
+ Elong
Right
).
In general, the first stage uses a constant filament power and maintains a constant tension on the fiber. This will
ensure that the process is more repeatable with aging filaments and changing ambient conditions. In this case,
the tension applied to the fiber is a more accurate gauge of the heat delivered to the fiber.
The final stage will define when the process is completed. For manufacturing a standard taper, typically the final
stage is determined by the displacement of the fiber. For coupler manufacturing, the final stage is determined by
the ouput power measured in the coupler.