| 摘要 |
<p>A thick-walled hollow silica rod (2) is manufactured with high geometric precision, is cleaned and a furnace (24) is employed which is capable of raising the silica to its melting temperature and in relation to which the rod is moved to produce an external thermal glazing of the rod, a vapour-phase internal deposition of a vitreous coating in this rod, by circulating therein a mixture of appropriate gaseous compounds, this coating being intended for the subsequent formation of the core of the optical fibres, and a collapse of the rod, the different temperatures of the rod which are necessary for performing these operations being obtained by varying the temperature of the furnace or the speeds of the rod in relation to the furnace. <IMAGE></p> |
