Method and apparatus for measuring a coating state

Details Method and apparatus for measuring a coating state Method and apparatus for measuring a coating state

G - Physics

01

B

G01B 11/06 (2006.01)

Patent

CA 2065482

ABSTRACT OF THE DISCLOSURE A side surface of a coated optical fiber is irradiated with parallel light, and a light beam reflected by an outer surface of a resin portion to a particular direction and a light beam reflected by a boundary surface between the resin portion and a glass portion to a direction in parallel with the particular direction are selectively detected by an image sensor using a condenser lens and a pinhole member. A distance d2 between the surface reflection light beam and the boundary reflection light beam and a distance d1 between incident light beams corresponding to those reflection light beams are measured. A coating state is estimated based on the distances d1 and d2 thus measured. - 57 -

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