Optical Fiber Dual Coating for High Temperature Stability
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Solution Overview
Problem
Existing optical fibers are inadequate for harsh environments due to limited temperature resistance, complex production processes, and high attenuation, making them unsuitable for applications like aerospace, wind power, and high-temperature industrial settings.
Innovation Solution
A method for forming optical fibers involves melting a fiber preform at high temperatures, drawing it into a filament, cooling, and coating with acrylic or organic silicone resin, followed by ultraviolet solidification to achieve a temperature-resistant optical fiber with improved mechanical and optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If polyimide coating is used for temperature resistance, then temperature resistance is improved, but production efficiency deteriorates due to low drawing speed
Solution Approach 1:
The coating process is divided into multiple stages: first applying a lower-viscosity acrylic resin coating that is UV-cured, then applying a higher-viscosity organic silicone resin coating. This segmentation allows each coating to be applied under optimized conditions, with the first coating providing rapid curing and the second providing enhanced temperature resistance, thereby resolving the contradiction between temperature resistance and production efficiency.
Solution Approach 2:
The patent changes the viscosity parameter of the coating materials by selecting acrylic resin with viscosity of 2000-5000cps for the first coating and organic silicone resin with viscosity of 3000-8000cps for the second coating. This parameter optimization enables the coating to be applied at high drawing speeds while maintaining temperature resistance up to 200°C.
2Temperature
If polyimide coating is used for temperature resistance, then temperature resistance is improved, but attenuation increases due to high modulus
Solution Approach 1:
The patent uses a composite coating structure combining acrylic resin and organic silicone resin. The acrylic resin provides a flexible base coating with lower attenuation, while the organic silicone resin overlay provides enhanced temperature resistance. This composite approach achieves both low attenuation and high temperature resistance, resolving the contradiction between these two properties.
3Temperature
If thermal solidification is used for coating, then temperature resistance is improved, but production speed deteriorates due to slow solidification
Solution Approach 1:
The patent replaces thermal solidification with UV photopolymerization for coating the acrylic resin layer. This substitution enables rapid solidification at high drawing speeds while maintaining the temperature resistance benefits. The UV-cured acrylic coating is then overlaid with UV-cured organic silicone coating, achieving both high production speed and temperature resistance.
4Productivity
If UV solidification is used for coating, then production efficiency is improved, but process complexity increases due to heating and wrapping steps
Solution Approach 1:
The patent extracts and eliminates the heating and wrapping steps from the conventional UV solidification process. By using UV-curable coatings that solidify immediately upon UV exposure during the drawing process, the patent removes the need for subsequent heating and wrapping operations, thereby reducing process complexity while maintaining high production efficiency.
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
The resulting optical fiber can maintain stable performance for long periods at temperatures up to 250 degrees Celsius, with low attenuation and high mechanical strength, enabling reliable use in harsh environments.
Implementation Method 1
melting a fiber preform at 2000 degrees Celsius and above
Implementation Method 2
solidified by ultraviolet to obtain a primary coated filament
Data Source
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AI summary
The present disclosure provides an optical fiber and a method for forming the optical fiber. The method includes melting a fiber preform at above 2000 degrees Celsius and drawing the fiber preform into a filament. The filament is cooled to 45 to 55 degrees Celsius. An acrylic resin or organic silicone resin is coated on the cooled filament, which is solidified by ultraviolet to obtain a primary coated filament. An organic silicone resin is coated on the primary coated filament, solidification again by ultraviolet to obtain the optical fiber. The optical fiber of the present disclosure is formed by two coating processes with the acrylic (or the organic silicon) and the organic silicon. The diameter of the finished optical fiber reaches 245µm. The optical fiber can be used at 200 degrees Celsius for a long time, and the performances are stable. The optical fiber can also be used at 250 degrees Celsius for at least 7 days.