Method and apparatus for measuring a coating state
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United States of America Patent
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-
Feb 22, 1994
Grant Date -
N/A
app pub date -
Apr 8, 1992
filing date -
Apr 11, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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 d.sub.2 between the surface reflection light beam and the boundary reflection light beam and a distance d.sub.1 between incident light beams corresponding to those reflection light beams are measured. A coating state is estimated based on the distances d.sub.1 and d.sub.2 thus measured.
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