The invention discloses a melting
contraction method for improving the uniformity of a preform
mandril. A melting contraction lathe, a high-temperature melting contraction furnace, an outer
diameter measuring instrument, a shuttling moving motor and an
encoder are included. The melting
contraction method for improving the uniformity of the preform
mandril comprises the following steps: S1, a preparation process: the high-temperature melting contraction furnace is heated to clamp a deposited hollow
optical fiber perform on the melting contraction lathe; and S2, a melting contraction process: heating the continuously rotating hollow perform to 2000-2300 DEG C under the action of a high temperature, wherein the preform is softened at the high temperature. According to the melting contractionmethod for improving uniformity of the preform
mandril, by arranging the outer
diameter measuring instrument on the high-temperature melting contraction furnace and fixing the outer
diameter measuringinstrument together with the high-temperature melting contraction furnace, the outer diameter
measuring instrument moves with the high-temperature melting contraction furnace synchronously. The diameter of the
optical fiber preform in the melting contraction process is measured in real time by means of the outer diameter measuring instrument. Moreover, position information in the moving process of the high-temperature melting contraction furnace is positioned accurately by means of the high-temperature melting contraction furnace and the
encoder on the shuttling moving motor.