Method and apparatus for measuring a coating state
AssigneeSumitomo Electric Industries, Ltd.
InventorsAkira Inoue, Yuji Kobayashi, Shuji Shinoki
Life of this patent
Estimating the term…
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.
Claims32
A coating state measuring method comprising the steps of:
- irradiating, with incident light, a side surface of a cylindrical linear body having a main body and a coating of at least one layer formed on the main body;
- detecting a surface refection light beam reflected by an outer surface of the coating to at least one particular direction and a boundary reflection light beam reflected by a boundary surface between the coating and the main body or by boundary surface between adjacent layers of the coating to a direction in parallel with the particular direction;
- determining a center of the main body based on a refection light distance between the surface reflection light beam and the boundary reflection light;
- and
- determining a thickness and a variation of the thickness of the coating based on an eccentricity of the center of the main body from a center of the cylindrical linear body.
A coating state measuring method comprising the steps of:
- irradiating, with incident light, a side surface of a cylindrical linear body having a main body and a coating of at least one layer formed on the main body;
- detecting a surface reflection light beam reflected by an outer surface of the coating to at least one particular direction and a boundary reflection light beam reflected by a boundary surface between the coating and the main body or by a boundary surface between adjacent layers of the coating to a direction in parallel with the particular direction;
- and
- determining a thickness and a variation of the thickness of the coating based on an incident light distance between an incident light beam corresponding to the surface reflection light beam and another incident light beam corresponding to the boundary reflection light beam.
A coating state measuring apparatus comprising:
- means for irradiating, with incident light, a side surface of a cylindrical linear body having a main body and a coating of at least one layer formed on the main body;
- means for detecting a surface reflection light beam reflected by an outer surface of the coating to at last one particular direction and a boundary reflection light beam reflected by a boundary surface between the coating and the main body or by boundary surface between adjacent layers of the coating to a direction in parallel with the particular direction;
- means for determining a center of the main body based on a reflection light distance between the surface reflection light beam and the boundary reflection light beam;
- and
- means for determining a thickness and a variation of the thickness of the coating based on an eccentricity of the center of the main body from a center of the cylindrical linear body.
A coating state measuring apparatus comprising:
- means for irradiating, with incident light, a side surface of a cylindrical linear body having a main body and a coating of at least one layer formed on the main body;
- means for detecting a surface reflection light beam reflected by an outer surface of the coating to at least one particular direction and a boundary reflection light beam reflected by a boundary surface between the coating and the main body or by a boundary surface between the adjacent layers of the coating to a direction in parallel with the particular direction;
- and
- means for determining a thickness and a variation of the thickness of the coating based on an incident light distance between an incident light beam corresponding to the surface reflection light beam and another incident light beam corresponding to the boundary reflection light beam.
Dependencies are inferred from the claim text.