Detecting the presence or absence of a coating on a substrate

Details Detecting the presence or absence of a coating on a substrate Detecting the presence or absence of a coating on a substrate

1981-12-11

1984-06-26

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

250572, 356430, G01N 2188, G01N 2189

Patent

active

044563744

ABSTRACT:
A method and apparatus is provided for determining the presence or absence of a coating on a substrate. The substrate is placed into optical contact with a light guide and the principle of frustrated total internal reflection is utilized. Light scattered from the coating surface is monitored to indicate the presence of a coating and failure to detect scattered light indicates the absence of said coating.

REFERENCES:
patent: 3460893 (1969-08-01), Wilks, Jr.
patent: 4297032 (1981-10-01), Temple

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