Electric heating – Inductive heating – Specific heating application
Patent
1995-10-31
1997-12-16
Hoang, Tu B.
Electric heating
Inductive heating
Specific heating application
219636, 373137, H05B 610, F27D 100
Patent
active
056981244
ABSTRACT:
A fiber drawing apparatus is provided with an improved fiber draw furnace wherein an inner zirconia tube is surrounded by a radially-spaced annular insulating region of magnesia within a silica beaker. While the magnesia has a melting point approximately the same as zirconia, the electrical conductivity of magnesia is substantially lower, enabling it to withstand higher RF power. Moreover magnesia is more soluble than zirconia in silica, reducing the likelihood of particulate contamination of the fiber.
REFERENCES:
patent: 4450333 (1984-05-01), Andrejco et al.
patent: 4547644 (1985-10-01), Bair et al.
patent: 4608473 (1986-08-01), Paek et al.
patent: 5308947 (1994-05-01), Fleming, Jr.
patent: 5410567 (1995-04-01), Brundage et al.
R.B. Runk, "A Zirconia Induction Furnace For Drawing Precision Silica Waveguides", Optical Fiber Transmission II Technical Digest (TuB5-1)(Feb. 22-24, 1977).
DiMarcello Frank Vincent
Fleming, Jr. James William
Hart, Jr. Arthur Clifford
Huff Richard Garner
Kranz Karen S.
Books Glen E.
Hoang Tu B.
Lucent Technologies - Inc.
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