Optics: measuring and testing – Inspection of flaws or impurities – Transparent or translucent material
Reexamination Certificate
2007-12-11
2007-12-11
Nguyen, Sang H. (Department: 2886)
Optics: measuring and testing
Inspection of flaws or impurities
Transparent or translucent material
C356S239800, C356S237100
Reexamination Certificate
active
11133889
ABSTRACT:
Disclosed are process and apparatus for inspecting internal inclusions in internally transmissive substrates. The process involves applying a black coating to one major surface of the substrate, submerging the substrate in a refractive index-matching fluid, and scanning the substrate with a collimated light beam. The scattered light signals produced by the inclusions can be detected by the human eye or by using a light detector. By the use of index-matching fluid and the black coating, the signal-to-noise ratio of the process and apparatus are enhanced. A preferred black coating is one cured from an electron beam or photo polymerizable coating composition applied to the major surface. The process and apparatus are particularly suitable for inspecting internal inclusions in an internally transmissive substrate having considerable amount of surface defects or contoured surface that prevent it from inspection in a gas medium.
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Cyr David G.
Daigler Christopher P.
Fladd David R.
Jenne David C.
Nieber Albert R.
Chen Siwen
Corning Incorporated
Nguyen Sang H.
Santandrea Robert P.
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