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procedure and apparatus for the heating of glasraer kvartsraer, particularly for the manufacture of optical fibres
procedure and apparatus for the heating of glasraer kvartsraer, particularly for the manufacture of optical fibres
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机译:格拉斯瓦尔·克瓦尔茨雷尔加热的方法和设备,特别是用于制造光纤
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摘要
A method of heating glass tubes, particularly quartz tubes for the manufacture of optical fibres, where the tube is pre-heated, preferably by means of a gas flame, whereafter the tube is heated by means of microwave energy generated by a microwave generator (1), by introducing the tube axially into a microwave cavity (3) comprising in its end walls (6,7) or end surfaces openings for the tube. According to the invention, at least one electrical field is given a field image according to a TM-0n0-mode, preferably according to the TM-020-mode, which mode has a maxima (10) along the central axis (9;c-c) of the cavity (3) and a minima (11,12) on each side of and radially spaced from the central axis (9;c-c), where the electrical field portion located between the minima (11,12) is used for heating the wall of the glass tube (8). According to a preferred embodiment, an additional electrical field is caused to be formed by means of a second microwave generator (15), which field is given a field image according to a TE-01n-mode, preferably according to the mode TE-011, which field therewith is superposed upon the field according to the TM-0n0-mode.
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