| 摘要 |
A method of measuring the radius of curvature of the convex tip of a core protruding from the end of an optical transmission path is disclosed. The transmission path is implemented by an optical fiber. A measuring unit accommodating a condenser and an infrared camera is located to face the convex tip of the core. A semiconductor laser is connected to the end of the fiber remote from the convex tip. A laser beam issuing from the convex tip of the core is once condensed by the convex tip. The measuring unit determines the condensing point of the beam, and then measures the distance between the condensing point and the convex tip. Subsequently, after the space between the convex tip and the condenser has been filled with a medium different in refractive index from air, the measuring unit again measures the above distance. The radius of curvature of the convex tip is determined on the basis of a difference or a radio between the measured distances.
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