| 摘要 |
It makes use of the technique of chemical deposition in a vapour phase employing a plasma maintained by surface waves in a tube (2) intended to obtain a preform and comprises photodetection means (50) sensitive to the light emitted by the region of deposition (54) of the vitreous coating resulting from the reaction between suitable gaseous compounds, and capable of providing information relating to the region of emission of this light, and means (52) for controlling the travel of the deposition region, this travel being such as to make the thickness of the coating uniform in the tube, these means of control determining the power of the microwave generator (30) of the device as a function of the said information. …<??>Application to the field of telecommunications. …<IMAGE>… |
