US 12,467,824 B2
Inspection method for optical fiber, inspection device for optical fiber, and method for manufacturing optical fiber-wound bobbin
Satoshi Matsunaga, Sakura (JP)
Assigned to Fujikura Ltd., Tokyo (JP)
Appl. No. 18/017,252
Filed by Fujikura Ltd., Tokyo (JP)
PCT Filed Jul. 13, 2021, PCT No. PCT/JP2021/026231
§ 371(c)(1), (2) Date Jan. 20, 2023,
PCT Pub. No. WO2022/019176, PCT Pub. Date Jan. 27, 2022.
Claims priority of application No. 2020-124553 (JP), filed on Jul. 21, 2020.
Prior Publication US 2024/0035924 A1, Feb. 1, 2024
Int. Cl. G01M 11/00 (2006.01)
CPC G01M 11/30 (2013.01) 11 Claims
OG exemplary drawing
 
1. An inspection method for an optical fiber including a bare optical fiber and a light-transmitting coating layer that coats an outer peripheral surface of the bare optical fiber, the inspection method comprising:
irradiating, with illumination light having directivity, an outer peripheral surface of a wound body that includes the optical fiber wound in multiple layers around a bobbin;
receiving the illumination light reflected by the wound body and generating image data containing at least a part of an image of the illumination light; and
determining, based on the image data, whether a stripe pattern is projected in the image, wherein
the stripe pattern is a state in which the illumination light repeatedly changes along a winding direction of the optical fiber.