Method for measuring amount of twist of optical fiber, and method for manufacturing optical fiber
By measuring the change in coating eccentricity angle from multiple directions, the method accurately determines the twist amount in optical fibers during drawing, ensuring high-quality fiber production.
WO2026088958A1 Publication Date: 2026-04-30SUMITOMO ELECTRIC INDUSTRIES LTD
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Patent Information
- Application Number
- PCT/JP2025/037022
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-10-23
- Filing Date
- 2025-10-21
- Publication Date
- 2026-04-30
AI Technical Summary
Technical Problem
Existing methods do not accurately measure the amount of twisting of an optical fiber during wiring, which is crucial for ensuring the quality and performance of optical fibers.
Method used
A method that measures the change in coating eccentricity angle of an optical fiber from multiple directions at different positions along its travel direction, calculating the twist amount based on the measured eccentricity angles, allowing for precise measurement of twist during the drawing process.
Benefits of technology
Enables accurate measurement of twist in optical fibers during wiring, facilitating the production of fibers with controlled twist patterns, thereby improving their performance and quality.
✦ Generated by Eureka AI based on patent content.
Abstract
This method for measuring the amount of twist of an optical fiber is a method for measuring, during line drawing, the amount of change in a coating eccentricity angle of an optical fiber that includes a glass fiber and a coating resin layer disposed on the outer periphery of the glass fiber, the method including: a step for imaging the optical fiber from a plurality of mutually different directions at a first position in a direction of travel of the optical fiber, and for measuring a first coating eccentricity angle, which is the coating eccentricity angle at the first position; a step for imaging the optical fiber from a plurality of mutually different directions at a second position in the direction of travel, which differs from the first position, and for measuring a second coating eccentricity angle, which is the coating eccentricity angle at the second position; a step for calculating, on the basis of the first coating eccentricity angle and the second coating eccentricity angle, the amount of change in the coating eccentricity angle of the optical fiber between the first position and the second position; and a step for calculating, on the basis of the calculated amount of change, the amount of twist of the optical fiber.
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