DETECTOR FOR ANOMALY IN OPTICAL FIBER, DEVICE FOR MANUFACTURING OPTICAL FIBER, AND METHOD FOR DETECTING ANOMALY IN OPTICAL FIBER

摘要

PROBLEM TO BE SOLVED: To provide a technique for detecting internal defects such as the mixing-in of air bubbles by observing forward-scattered light of parallel rays laterally incoming into optical fiber, as to optical fiber (bare optical fiber) having a portion whose refractive index is lower than that of pure quartz in a refractive index profile.;SOLUTION: In this detector 10 for anomalies in optical fiber, after drawing, parallel rays 11 are caused to continuously enter uncoated bare optical fiber 31 from the side while forward-scattered light 13 thereof is continuously received, and whether or not the optical fiber 31 is anomalous is determined from temporal variation in the reception intensity of the scattered light 13. A device provided for manufacturing optical fiber includes the detector 10. A method is provided for detecting anomalies in optical fiber.;COPYRIGHT: (C)2010,JPO&INPIT