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    Method for manufacturing an article comprising a refractory dielectric body
    1.
    发明公开
    Method for manufacturing an article comprising a refractory dielectric body 失效
    Verfahren zur Herstellung eines Gegenstands mit eingeschlossenem feuerfestem dielektrischem Teil。

    公开(公告)号：EP0439918A1

    公开(公告)日：1991-08-07

    申请号：EP90312802.3

    申请日：1990-11-23

    申请人： AT&T Corp.

    发明人： Fleming, James William, Jr. ,  Partus, Fred Paul

    IPC分类号： C03B37/012 ,  C03B19/14

    CPC分类号： C03B37/0148 ,  C03B37/01205 ,  C03B37/01237 ,  C03B37/01257 ,  C03B37/01446

    摘要： To attain high strength optical glass fibers, the glass preforms, from which the fibers are drawn, must generally be free of surface imperfections such as bubbles, and air lines. It has been discovered that these imperfections can be removed quickly and cleanly by contacting the preform surface with a substantial portion of the electrically conducting plasma region (the plasma fireball) extending from a plasma torch. Significantly, the surface material is substantially removed by vaporization, due to the extremely high plasma temperature (>9000°C at the plasma center) of the isothermal plasma torch. Though the temperatures in the tail of the plasma fireball are substantially less than at the plasma center, the temperatures are generally still several thousand degrees centigrade. These tail temperatures typically are sufficiently high to cause vaporization of most refractory dielectrics making the inventive method applicable to the fabrication of a wide variety of articles comprising refractory dielectric bodies.
    Advantageously, selective etching, according to one aspect of the inventive method, is used to remove fiber preform eccentricity and to fabricate optical fiber preforms with non-circular cross-sections for such applications as fiber sensors. Selective etching can result by controlling the plasma fireball location, the rotation of the silica preform, and/or the travel of the fireball across the preform. Significantly, the fireball location is controlled, among other ways, by injecting into the torch an additional gas that has a high ionization threshold or by inserting a probe along the axis of the torch. In either case, a substantial portion of the plasma fireball is advantageously "pushed" outside the torch for ease of contact with the silica preform surface, or any other refractory dielectric being processed.

    摘要翻译： 为了获得高强度光学玻璃纤维，纤维被拉伸的玻璃预制件通常必须没有表面缺陷，如气泡和空气管线。 已经发现，通过使预成型件表面与从等离子体焰炬延伸的导电等离子体区域（等离子体火球）的大部分接触，可以快速且干净地去除这些缺陷。 重要的是，由于等离子体焰炬的等离子体温度（等离子体中心处的等离子体温度高于9000℃），表面材料基本上被汽化除去。 虽然等离子体火球的尾部的温度显着小于等离子体中心处的温度，但是温度通常还是几千摄氏度。 这些尾部温度通常足够高以引起绝大多数难熔电介质的汽化，使得本发明的方法适用于制造包含难熔介电体的各种制品。 有利地，根据本发明方法的一个方面，选择性蚀刻用于去除纤维预制件偏心度，并且制造具有用于诸如光纤传感器的应用的非圆形横截面的光纤预制件。 选择性蚀刻可以通过控制等离子火球位置，二氧化硅预制件的旋转和/或火球穿过预成型件的行程来实现。 重要的是，除了其他方式之外，通过将具有高电离阈值的附加气体或通过沿着手电筒的轴线插入探针来控制火球位置。 在任一种情况下，等离子体火球的大部分有利地被“推”到割炬之外，以便与二氧化硅预制件表面或任何其它待处理的耐火电介质接触。

    Method for making optical fiber preforms
    4.
    发明公开
    Method for making optical fiber preforms 失效
    一种用于制造预制件用于光学纤维的方法。

    公开(公告)号：EP0656326A3

    公开(公告)日：1996-01-17

    申请号：EP94308648.8

    申请日：1994-11-23

    申请人： AT&T Corp.

    发明人： Partus, Fred Paul ,  Thomas, Gordon Albert

    IPC分类号： C03B37/018 ,  C03B37/014

    CPC分类号： C03B37/01861 ,  C03B37/01815 ,  C03B37/01823 ,  C03B37/01869

    摘要： A method for making a glass preform substantially free of OH impurities is disclosed. The method comprises the steps of introducing a moving stream of a vapor mixture including at least one compound glass-forming precursor together with an oxidizing medium into a tube, while generating a hydrogen-free isothermal plasma on an outer surface of the tube to react the mixture and produce a glassy deposit on an inner surface of the tube.

    Method for making optical fiber preforms
    6.
    发明公开
    Method for making optical fiber preforms 失效
    制造光纤预制棒的方法

    公开(公告)号：EP0656326A2

    公开(公告)日：1995-06-07

    申请号：EP94308648.8

    申请日：1994-11-23

    申请人： AT&T Corp.

    发明人： Partus, Fred Paul ,  Thomas, Gordon Albert

    IPC分类号： C03B37/018 ,  C03B37/014

    CPC分类号： C03B37/01861 ,  C03B37/01815 ,  C03B37/01823 ,  C03B37/01869

    摘要： A method for making a glass preform substantially free of OH impurities is disclosed. The method comprises the steps of introducing a moving stream of a vapor mixture including at least one compound glass-forming precursor together with an oxidizing medium into a tube, while generating a hydrogen-free isothermal plasma on an outer surface of the tube to react the mixture and produce a glassy deposit on an inner surface of the tube.

    摘要翻译： 公开了一种制造基本上不含OH杂质的玻璃预制件的方法。 该方法包括以下步骤：将包含至少一种化合物玻璃形成前体的蒸气混合物的移动流与氧化性介质一起引入管中，同时在管的外表面上产生无氢等温等离子体以使 混合物并在管的内表面上产生玻璃状沉积物。

    Method and apparatus for modifying the transverse cross section of a body
    7.
    发明公开
    Method and apparatus for modifying the transverse cross section of a body 失效
    Verfahren und Vorrichtung zurÄnderungdes Querschnittes einesKörpers。

    公开(公告)号：EP0484035A1

    公开(公告)日：1992-05-06

    申请号：EP91309752.3

    申请日：1991-10-22

    申请人： AT&T Corp.

    发明人： Fleming, James William, Jr. ,  Moesle, Adolph Henry, Jr. ,  Partus, Fred Paul

    IPC分类号： C03B29/02 ,  C03B37/012 ,  C03B37/014

    CPC分类号： C03B37/01228 ,  C03B23/043 ,  C03B23/057 ,  C03B29/02 ,  C03B37/01257 ,  C03B37/01446 ,  C03B37/01466 ,  C03B37/0148 ,  C03B37/01861 ,  C03B37/01884 ,  Y02P40/57 ,  Y10T82/10 ,  Y10T82/2502

    摘要： The transverse cross section of a body (20) is modified by the steps of: a) determining the extent to which the body (20) has material in excess of a desired shape at a plurality of points, b) exposing the body (20) to a local heat source (10) having a temperature sufficiently high to remove material from the surface of the body (20), and c) moving the surface of the body (20) in relation to the source (10) at a speed which decreases in regions where the body (20) has material in excess of the desired shape so as to remove more material from such regions than from other regions. In a preferred embodiment, the body (20) is an optical fiber preform (20), the local heat source (10) is the fireball (12) of a plasma torch (10), and the body (20) is moved relative to the torch (10) by rotating the preform (20) at a controllable angular velocity while the torch (10) is translated along the length of the preform (20).

    摘要翻译： 主体（20）的横截面通过以下步骤进行修改：a）确定主体（20）在多个点处具有超过期望形状的材料的程度，b）使主体（20 ）到具有足够高的温度以从主体（20）的表面去除材料的局部热源（10），以及c）以相对于源（10）的速度移动主体（20）的表面 其在主体（20）具有超过所需形状的材料的区域中减小，以便从这些区域除去比其它区域更多的材料。 在优选实施例中，主体（20）是光纤预制件（20），局部热源（10）是等离子体焰炬（10）的火球（12），并且主体（20）相对于 所述手电筒（10）通过沿着所述预成型件（20）的长度平移来以可控的角速度旋转所述预成型件（20）。