| 摘要 |
PURPOSE:To provide the titled measuring apparatus for measuring or inspecting various measuring factors of the base material of an optical fiber in an extreme ly efficient manner, by using existing measuring apparatuses and organically the same. CONSTITUTION:The base material of an optical fiber is attached to specimen rotating drive apparatuses 4, 6 and an illumination apparatus 8 is subsequently energized to allow sufficiently excited light to irradiate the incident terminal 2a of the base material 2. The transmitted light intensity distribution (near field pattern) corresponding to refractive index distribution is measured at the emitting terminal 2b of said base material 2. The reception of light intensity is performed by using a terminal surface light intensity detection apparatus 26 such as a TV camera and a core/clad diameter ratio is measured simultaneously with the measurement of refractive index distribution. Further, in order to measure an internal flaw, the specimen rotating drive apparatuses 4, 6 are operated to rotate the base material 2 at a predetermined rotary speed and, at the same time, a weak light detection apparatus 32 is operated while moved along the longitudinal axis direction of the base material 2. |
