Optics: measuring and testing – Inspection of flaws or impurities – Transparent or translucent material
Patent
1998-04-10
2000-10-17
Font, Frank G.
Optics: measuring and testing
Inspection of flaws or impurities
Transparent or translucent material
3562395, 356382, G01N 2100, G01B 1106
Patent
active
061339997
ABSTRACT:
Apparatus for measuring glass layer thickness in the sidewall of a glass container in which a container is placed in a bath of oil having an index of refraction matching that of the container outer sidewall surface. The body of the container is engaged within the bath to permit rotation while restraining lateral motion as the finish of the container is rotated. Light energy is directed through the bath and tangentially through the sidewall of the container so as to establish a pattern of light energy as a function of sidewall layer thickness, and layer thickness is determined as a function of such light pattern. As applied specifically to measuring thickness of the casing glass layer in a cased glass container in accordance with the preferred method of the invention, such casing glass thickness is determined as a function of the pattern in the light energy that emerges from the oil bath.
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Graham Paul W. L.
Myers Ronald T.
Font Frank G.
Owens-Brockway Glass Container Inc.
Smith Zandra V.
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