Method of producing an optical fibre blank
    1.
    发明授权
    Method of producing an optical fibre blank 失效
    光纤毛坯的制造方法

    公开(公告)号:US4121919A

    公开(公告)日:1978-10-24

    申请号:US876371

    申请日:1978-02-09

    CPC分类号: C03B37/01869 G02B6/03611

    摘要: The blank is made from a tube of silica with a layer of other glass coated on its inner surface. The said other glass is doped with P.sub.2 O.sub.5 for example to increase its refractive index. The blank is then reduced in diameter from a tube to a rod by heating a region of the tube while it rotates in a glassmaker's lathe. The heated region is moved back and forth along the length of the tube until it is finally reduced to a rod. One effect of the moving heated zone is to evaporate some of the doping material, and the vapour tends to move along the tube ahead of the heated zone until it is eventually shifted out of the ends of the tube. To minimize this loss the back and the forth movement of the heated zone includes a sudden step forward at the end of each pass before returning in the opposite direction. This has the effect of jumping the heated zone ahead of the escaping doping material which is then pushed back along the bore of the tube for the next pass, with the jump-ahead-and-reverse operation being repeated at each reversing point of the back and forth heated pass to conserve as much of the doping material as possible inside the tube and finally within the resulting glass fibre blank.

    摘要翻译: 坯料由二氧化硅管制成,其内部表面涂有其他玻璃层。 所述另一玻璃掺杂有例如P2O5以增加其折射率。 然后通过在玻璃制造商的车床中旋转的同时加热管的一部分,坯料从管直径减小到杆。 加热区域沿着管的长度来回移动,直到其最终被还原成杆。 移动的加热区域的一个效果是蒸发一些掺杂材料,并且蒸气倾向于沿加热区域前面的管移动,直到其最终移出管的端部。 为了最小化这种损失,加热区域的后部和第四运动包括在每次通过结束时向前相反的方向前进的向前的方向。 这具有在逸出的掺杂材料之前跳过加热区的作用,然后将其沿着管的孔推回以进行下一道次,其中在反向的每个反向点处重复跳跃前进和反向操作 并加热通过以在管内尽可能多地保留掺杂材料,最后在所得的玻璃纤维坯料内。