Electric heating – Metal heating – Of cylinders
Patent
1982-05-28
1984-05-22
Envall, Jr., Roy N.
Electric heating
Metal heating
Of cylinders
219 1041, 65 13, 6537413, 373139, 373155, 156DIG83, 422248, 432248, 432264, 427 451, H05B 630, C03B 2702, F27B 1410
Patent
active
044503334
ABSTRACT:
A high frequency induction furnace (10) for reflowing a portion of a lightguide preform (44) in order to draw a fiber (52) therefrom. The furnace (10) has a centrally located tubular susceptor (34) therein having a thin coating of the preform material (e.g., silica) on at least a portion of the inside surface thereof. A cylinder (62) is positioned in concentric, spaced relation about the susceptor (34) and is surrounded by an insulating grain (36). A high frequency coil (38) is energized to couple its electromagnetic field to the susceptor (34) to heat and reflow a portion of the preform (44) in order to draw the fiber (52) therefrom. The thin coating prevents contaminating particulates from migrating from small cracks in the inside surface of the susceptor (34) onto the preform (44) while the cylinder (62) prevents small particulate emanating from the insulating grain (36) from being drawn through larger cracks in the susceptor and onto the preform and/or the fiber 52.
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"A Zirconia Induction Furnace for Drawing Precision Silica Wave Guides", by R. B. Runk, Optical Fiber Transmission II Technical Digest (Tu B5-1), Feb. 1977.
Andrejco Matthew J.
Paek Un C.
Schroeder, Jr. Charles M.
AT&T - Technologies, Inc.
Envall Jr. Roy N.
Kirk D. J.
Leung Philip H.
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