MANUFACTURE OF MEASURING DEVICE AND FIBER FOR TRANSPARENT OBJECT AND FIBER MANUFACTURED THEREBY

摘要

PURPOSE: To quickly monitor the constancy of many parameters related to the internal structure of an optical fiber by arranging an objective system between a measuring space and a radiation-sensitive detecting system and installing a receiver of a limited range to the objective system. CONSTITUTION: In a device which measures such an object as the optical fiber 311 which is at least partially transparent, a radiation beam is directed to the object. In addition, the radiation beam deflected by the object is projected upon a radiation sensitive detecting system 330 through lenses 321 and 322. The dark band or bright band corresponding to the projection of the interface between areas (fiber 311 and coating 312) having different refractive indexes in the object and between the object and its surrounding area 315 is generated in the system as a result of refraction at the interface. Therefore, measurement can be performed in the internal structure of the object.