光ファイバの屈折率分布の測定装置及び当該測定装置の処理装置

Japanese Patent JP7216042

B2

To provide a technique for accurately measuring the refractive-index distribution of an optical fiber in a simple configuration.SOLUTION: A measuring device comprises: imaging means that has an imaging element and takes intensity images of a side face of an optical fiber from a plurality of imaging directions; and processing means that processes the intensity images taken by the imaging means. The imaging means takes two intensity images, in each of the plurality of imaging directions, having phases of light transmitted through the optical fiber at an imaging position that are different from each other. The processing means comprises: generation means that generates a phase image in each imaging direction on the basis of the two intensity images taken from each of the plurality of imaging directions; and inverse conversion means that executes Abel inverse conversion on the phase image in each imaging direction so as to obtain the refractive-index distribution of the optical fiber in a direction orthogonal to the longitudinal direction of the optical fiber in the phase image in each imaging direction.SELECTED DRAWING: Figure 2

Yuta Wakayama
Daniel Elson
Takehiro Tsuritani

JP2020057900A

January 31, 2023

March 27, 2020

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KDDI CORPORATION

G01M11/00; G01J9/00; G01N21/41

JP2309227A
JP63165726A
JP2015169873A

CN109827927A

DE DORLODOT, B. et al.,Comparative study of quantitative phase imaging techniques for refractometry of optical fibers ,Proceedings of SPIE,2018年,Vol.10535,pp.1053516-1~1053516-8,doi:10.1117/12.2290324

Patent Attorney Corporation Otsuka International Patent Office
Yasunori Otsuka
Yasuhiro Otsuka
Shiro Takayanagi
Shuji Kimura
Osamu Shimoyama
Nagakawa Yumitsu
Takashi Sakamoto
Maeda Koji

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