Optical Fiber Slow Cooling Nozzle Control for Uniform Density
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Solution Overview
Problem
Existing optical fiber manufacturing processes face challenges in achieving uniform air flow and preventing nozzle plugging during the cooling process, which affects fiber density and attenuation due to varying draw speeds.
Innovation Solution
The implementation of an adjustable outlet nozzle in the annealing furnace, controlled by a controller, adjusts its opening size based on the draw speed of the optical fiber to maintain optimal air flow and prevent nozzle plugging, ensuring uniform cooling and reduced Rayleigh scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed outlet nozzle size is used in the annealing furnace, then the device complexity is reduced, but the manufacturing precision deteriorates due to variations in fiber density and increased Rayleigh scattering at different draw speeds
Solution Approach 1:
The outlet nozzle opening size is made dynamically adjustable based on draw speed. The system transitions from a fixed nozzle to one that can change its opening size, allowing optimization of air flow patterns for different draw speeds while maintaining fiber density uniformity and reducing Rayleigh scattering.
Solution Approach 2:
The physical parameter of the outlet nozzle (opening size) is changed according to draw speed conditions. By adjusting the opening size parameter, the system optimizes air flow patterns to maintain consistent cooling and fiber density across varying production speeds.
2Productivity
If the outlet nozzle opening size is increased to enhance air flow, then the cooling efficiency is improved, but nozzle plugging occurs at lower draw speeds
Solution Approach 1:
The outlet nozzle opening size is dynamically adjusted according to draw speed. At higher draw speeds, a larger opening provides enhanced cooling efficiency. At lower draw speeds, the opening is reduced to prevent nozzle plugging, thereby maintaining reliable operation across all production conditions.
Solution Approach 2:
The outlet nozzle opening size parameter is changed based on draw speed conditions. This parameter adjustment optimizes the balance between cooling efficiency and prevention of nozzle plugging, ensuring reliable operation across varying production rates.
3Reliability
If the outlet nozzle opening size is decreased to prevent plugging, then the reliability is improved, but cooling efficiency and air flow are reduced at higher draw speeds
Solution Approach 1:
The outlet nozzle opening size is made dynamically adjustable rather than fixed. This allows the system to use a smaller opening at low draw speeds to prevent plugging while switching to a larger opening at high draw speeds to maintain cooling efficiency, resolving the trade-off between reliability and productivity.
4Manufacturing precision
If air flow is not optimized at varying draw speeds, then the device complexity is reduced, but the fiber density uniformity deteriorates leading to increased Rayleigh scattering
Solution Approach 1:
The outlet nozzle opening size parameter is adjusted according to draw speed to optimize air flow patterns. This parameter change ensures uniform fiber density and minimizes Rayleigh scattering by providing appropriate cooling conditions for each draw speed regime.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables the production of uniformly dense optical fibers with reduced attenuation by controlling air flow and preventing nozzle plugging, thereby enhancing the manufacturing process efficiency.
Implementation Method 1
cool the optical fiber within a controlled cooling range to minimize fictive temperature and Rayleigh scattering
Implementation Method 2
selecting an opening size of an outlet nozzle operatively coupled to the outlet based on a draw speed of the optical fiber
Data Source
AI summary
A method of manufacturing optical fiber in an optical fiber production system is provided. The method includes providing a draw furnace operatively coupled to a slow cooling device along a draw pathway, drawing the optical fiber from an optical fiber preform in the draw furnace and along the draw pathway, heat treating the optical fiber in the slow cooling device positioned along the draw pathway, the slow cooling device comprising an inlet, an outlet, and a process tube extending between the inlet and the outlet, and selecting an opening size of an outlet nozzle operatively coupled to the outlet based on a draw speed of the optical fiber.