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System and method for controlling density of loose body of optical fiber preform in production process

An optical fiber preform and production process technology, applied in the field of optical fiber production, can solve the problems of not being able to find the density in time and changing the formula in time, unable to control the density uniformity of the rod body, unable to find the exact time point for formula adjustment, etc. Bad condition, increase strength, reduce cracking effect

Pending Publication Date: 2021-12-10
杭州金星通光纤科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the existing technology has no way to control the uniformity of the rod density, and the result feedback is delayed, and the density cannot be found in time and the formula can be changed in time; the formula adjustment may require multiple adjustments to obtain the desired effect; the formula adjustment cannot find the exact time point

Method used

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  • System and method for controlling density of loose body of optical fiber preform in production process
  • System and method for controlling density of loose body of optical fiber preform in production process
  • System and method for controlling density of loose body of optical fiber preform in production process

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Embodiment 1

[0040] refer to figure 1 As shown, this embodiment provides a system for controlling the bulk density of optical fiber preforms in the production process, including

[0041] A monitoring system, used to monitor the diameter and weight of the fiber preform loose body 5, and to feed back the monitoring data in real time;

[0042] The control system 2 is used to receive the monitoring data, and calculate the density of the soot body 5 of the optical fiber preform based on it, and send a formula adjustment instruction after comparing with the set density curve to further obtain the density error;

[0043] The MFC3 is used to execute the recipe adjustment command issued by the control system 2, and control the blowtorch to adjust the related gas flow, thereby realizing the adjustment of the density of the optical fiber preform loose body 5.

[0044] The monitoring system of this embodiment includes a laser caliper 1 and a weighing device 4; wherein the laser caliper 1 is used to m...

Embodiment 2

[0048] In terms of specific implementation, this embodiment provides a specific implementation of a system for controlling the density of the soot body of the optical fiber preform in the production process. First, the density of the soot body is calculated according to the system, and compared with the set density curve, the density error How much, and then adjust the formula.

[0049] In this embodiment, what the laser caliper 1 tests is the distance from the laser caliper to the measured object, and the radius of the loose body is calculated according to the distance:

[0050] R=r+h1-h2 where r is the radius of the mandrel, h1 is the distance from the initial laser caliper to the mandrel, and h2 is the distance from the laser caliper to the loose body during testing.

[0051] In this embodiment, r is 15mm, h1 is 500mm, and h2 is 470mm, then the radius of the loose body is calculated as R, and R=17+500-470=45mm.

[0052] Calculate the volume of a loose body from its radius:...

Embodiment 3

[0062] The present embodiment provides a kind of optimum state of deposition, that is, when deposition reaches 100 times, the volume V of the loose body=19500cm 3 , where the weight of the loose body G = 12500g, density ρ = 0.641g / cm 3 , the set value is 0.6g / cm 3 , deviation 0.041g / cm 3 , adjust CH 4 After flow, the density becomes 0.605g / cm 3 , which meets the requirements.

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Abstract

The invention relates to the technical field of optical fiber production, in particular to a system and method for controlling the density of a loose body of an optical fiber preform in a production process. The system comprises: a monitoring system used for monitoring the diameter and weight of the loose body of an optical fiber preform and feeding back monitoring data in real time; a control system used for receiving the monitoring data, calculating the density of the loose body of the optical fiber preform according to the monitoring data, comparing the density with a set density curve to further obtain a density error, and sending a formula adjusting instruction; and an MFC used for executing the formula adjusting instruction issued by the control system and controlling a blowtorch to adjust the related gas flow so as to realize the adjustment of the loose body density of the optical fiber preform. According to the invention, cracking of the loose body is reduced, various bad conditions of the cladding after the loose body is sintered are reduced, the strength of the optical fiber is improved, and the qualification rate of products is increased.

Description

technical field [0001] The invention relates to the technical field of optical fiber production, in particular to a system and method for controlling the density of the loose body of an optical fiber preform in the production process. Background technique [0002] The OVD deposition process is the main process for the production of the outer cladding of optical fiber preforms. According to statistics, the optical fibers manufactured by the OVD outsourcing process account for more than 60% of the world's total optical fiber output. The mechanism of OVD is flame hydrolysis, that is, gaseous halides (SiCL 4 etc.) react with hydrogen-oxygen flame or methane flame to generate a large amount of "dust" which moves back and forth along the rod body with the burner seat, and gradually deposits on the outer surface of the mandrel layer by layer, finally forming a cylindrical preform loose body . [0003] The density of the soot is an important parameter for the control of the OVD dep...

Claims

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Application Information

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IPC IPC(8): C03B37/018
CPCC03B37/01807C03B37/01861
Inventor 吴志元郑伟章海峰张学军王强强
Owner 杭州金星通光纤科技有限公司
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