Radiant energy – Radiation tracer methods
Patent
1981-08-06
1983-08-23
Bleutge, John C.
Radiant energy
Radiation tracer methods
73762, 73769, 25230119, C09K 1106, G01N 1908, G01N 2116
Patent
active
044006187
ABSTRACT:
A method of detecting flaws in a printed circuit board laminate having drilled holes wherein a penetrating solution containing a UV fluorescing dye is applied to the laminate to fill the drilled holes and flaws. Excess penetrating solution is removed from the drilled holes and the surface of the laminate. The penetrating solution remaining in the flaws is cured into an insoluble solid and then the laminate is cross-sectioned to provide at least one sample carrying the cured solution. The sample is encapsulated in a clear epoxy and the encapsulated sample is ground and polished to provide a surface which is examined under UV light.
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Bupp James R.
Maier Lawrence R.
Bleutge John C.
Gugger Gerald R.
International Business Machines - Corporation
Koeckert A. H.
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