Automatic control system and method for pressure in optical fiber preform sintering furnace

Abstract

The invention relates to an automatic control system and a method for pressure in an optical fiber preform sintering furnace, and belongs to the technical field of optical fiber preform vapor phase axial deposition, the automatic control system comprises a sintering furnace, wherein the sintering furnace comprises a main exhaust pipe for exhausting gas in the sintering furnace, and the main exhaust pipe is communicated with a pressure supplementing pipe for filling first gas into the main exhaust pipe and the sintering furnace; a pressure control unit which comprises a programmable controller, a differential pressure sensor for monitoring the pressure in the sintering furnace and a mass flow controller for measuring the flow of gas filled into the main exhaust pipe; wherein the programmable controller controls the mass flow controller to fill first gas with set flow into the main exhaust pipe according to the pressure value, monitored by the differential pressure sensor, in the sintering furnace, so that the pressure in the sintering furnace is kept within a set threshold value. The system plays an important role in stabilizing the stability of a thermal field in the sintering furnace and increasing the percent of pass of sintered optical fiber preform products, the workload of field operators is reduced, and automatic production of factories is promoted.

Description

technical field [0001] The present application relates to the technical field of vapor phase axial deposition of optical fiber preforms, in particular to an automatic control system and method for the pressure in an optical fiber preform sintering furnace. Background technique [0002] Vapor axial deposition (VAD) is currently an important process for producing the core layer of optical fiber preforms, which includes two process steps of deposition and sintering. The process of VAD is to first deposit silicon dioxide and germanium dioxide particles to form a white cylindrical loose body, and then dehydrate and sinter the loose body in a sintering furnace at high temperature to form a transparent glass cylinder. [0003] During the high-temperature dehydration and sintering process of the preform loose body in the sintering furnace, a strong oxidizing gas needs to be introduced into the sintering furnace to remove the moisture in the preform loose body, and at the same time, ...

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present application provides an automatic control system and method for the pressure inside the sintering furnace of an optical fiber preform to solve the problem that the internal pressure of the sintering furnace cannot be adjusted in real time in the related art, and the stability of the pressure cannot be effectively guaranteed, which affects the production of the pipeline preform. Rod quality issues

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