Abstract
We have performed an experimental study of the effect of (a) azimuthal inhomogeneity in the temperature field in a high-temperature furnace and (b) negative pressure inside the tube blank on the cross-sectional shape of a quartz capillary tube. Quartz tubes with cross-sectional dimensions of 20/16 mm/mm were used as tube blanks. The furnace temperature field had two orthogonal axes of symmetry marking the maximum and minimum heating applied to the tube blank. When drawing capillary tubes, the difference between the maximum and minimum values of the operating temperature near the heating-element wall was 60–80°C, and the pressure differential between the interior pressure and atmospheric pressure was 0–300 Pa. The temperature of the heating element and the pressure inside the tube blanks were adjusted to produce sample capillary tubes with interior ellipticities of 1.0–4.0 with mean relative diameters (inside to outside) of 0.7–0.05.
© 2016 Optical Society of America
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