ABNORMAL POINT DETECTION METHOD OF OPTICAL FIBER AND DEVICE THEREFOR

摘要

PURPOSE:To provide a method and a device system therefor for detecting abnormal points such as fine bubbles and flaws caused in optical fibers during the wire drawing. CONSTITUTION:In the device constituted of the wire-drawing mechanism and a processor 9, the fluctuation in the outer diameter of optical fiber 3 is fed back to the capstan 4 to change the take-up speed so that the outer diameter may be kept constant by changing the take-up speed within a prescribed and the speed change rate is compared with the previously indicated value in the period.