Method for rapidly removing high-temperature-resistant fiber polyimide coating layer with low damage

An optical fiber polyimide, low-damage technology, applied in the directions of light guides, optics, optical components, etc., can solve the problems of fiber core damage, affecting the mechanical strength of the fiber core, etc., to reduce surface damage and remove the coating layer. Fast, acid-less effect

Active Publication Date: 2017-08-11
BEIJING INST OF AEROSPACE CONTROL DEVICES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a fast and low-damage method for removing high-temperature-resistant optical fiber polyimide coatings for the existing removal methods that easily cause damage to the optical fiber core layer and affect the mechanical strength of the optical fiber core layer. method

Method used

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  • Method for rapidly removing high-temperature-resistant fiber polyimide coating layer with low damage
  • Method for rapidly removing high-temperature-resistant fiber polyimide coating layer with low damage

Examples

Experimental program
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Effect test

Embodiment 1

[0048]The power of the laser is adjusted to 2W, and the distance between the laser and the coating layer on the surface of the optical fiber is adjusted to the focal length of the laser at this power. Place an optical fiber with an outer diameter of 155-165 μm and a core diameter of 125 μm on one side of the laser spot, adjust the distance between the spot and the polyimide coating layer to 1.5mm, and drop 2-3 drops of mass on the surface of the part to be removed Concentrated sulfuric acid with a fraction of 98%. Turn on the laser and adjust the movement rate of the fiber to 5×10 -4 m / s, so that the parts of the optical fiber to be coated are sequentially passed near the light spot, the coating is removed, and a single optical fiber with the coating removed is obtained.

[0049] The embodiment of the present invention removes the optical fiber core surface after the coating layer is smooth (such as figure 2 a), the tensile strength is 30N.

Embodiment 2

[0051] The power of the laser is adjusted to 2W, and the vertical distance between the laser and the coating layer on the surface of the optical fiber is adjusted to the focal length of the laser at this power. Place optical fibers with an outer diameter of 155-165 μm on both sides of the laser spot, adjust the distance between the spot with a core diameter of 125 μm and the polyimide coating layer to 1.5mm, and drop 2-3 drops of mass on the surface of the part to be removed Concentrated sulfuric acid with a fraction of 98%. Turn on the laser and adjust the movement rate of the fiber to 5×10 -4 m / s, so that the parts of the optical fiber to be coated pass through the vicinity of the light spot successively, and two optical fibers with the coating removed at the same time are obtained.

[0052] The embodiment of the present invention removes the optical fiber core surface after the coating layer is smooth (such as figure 2 b), the tensile strength is 24N.

Embodiment 3

[0054] The power of the laser is adjusted to 1W, and the distance between the laser and the coating on the surface of the optical fiber is adjusted to the focal length of the laser at this power. Place an optical fiber with an outer diameter of 155-165 μm and a core diameter of 125 μm on one side of the laser spot, adjust the distance between the spot and the polyimide coating layer to 1mm, and drop 2-3 drops of mass fraction on the surface of the part to be removed 30% sulfuric acid. Turn on the laser and adjust the movement rate of the fiber to 8×10 -4 m / s, so that the parts of the optical fiber to be coated are sequentially passed near the light spot, the coating is removed, and a single optical fiber with the coating removed is obtained.

[0055] In the embodiment of the present invention, the surface of the optical fiber core layer after removing the coating layer is smooth, and the tensile strength is 19N.

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Abstract

The invention, which belongs to the technical field of surface treatment of a high molecular material, relates to a method for rapidly removing a high-temperature-resistant fiber polyimide coating layer with low damage. With laser radiation, the temperature of acid liquor at the surface of a coating layer rises quickly and the acid liquor boils; and because of the boiling acid liquor, the polyimide coating layer is processed by oxygenolysis rapidly; and thus an objective of removing the coating layer rapid and completely is achieved. With the method provided by the invention, a coating layer at the end of a fiber as well as a coating layer with any length at any part in the middle of the fiber can be removed quickly; and the surface damage of the fiber core layer by the instantaneous high temperature can be reduced. The coating layer removing speed is fast and the acid liquor amount is reduced; and the operation becomes secure. The method has the high application potential by being compared with other same kinds of methods in related fields like fiber grating sensor packaging and fiber grating writing and is suitable for precise removing of a polyimide coating layer of a high-temperature-resistant fiber.

Description

technical field [0001] The invention relates to a method for removing a coating layer on the surface of a high-temperature-resistant optical fiber, and belongs to the technical field of polymer material surface treatment. Background technique [0002] Polyimide-coated optical fiber has excellent mechanical strength, good flexibility, strong acid and alkali corrosion resistance, excellent high and low temperature resistance performance, and is widely used in optical fiber sensing, optical fiber lighting, optical fiber gyroscope, optical fiber medical and other fields have important applications. However, in the actual use of the optical fiber, it is often necessary to remove part of the polyimide coating to facilitate the welding of optical fiber components and the packaging of sensors. Therefore, fast, convenient, and low-damage removal of polyimide coatings is of great significance in realizing automated production and intelligent manufacturing. [0003] At present, the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/245
Inventor 李彦博余正海陈永秀唐才杰严小军刘俊利姚竹贤
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES
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