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Surface cleanliness measurement procedure

United States Patent

April 30, 2002
View the Complete Patent at the US Patent & Trademark Office
A procedure and tools for quantifying surface cleanliness are described. Cleanliness of a target surface is quantified by wiping a prescribed area of the surface with a flexible, bright white cloth swatch, preferably mounted on a special tool. The cloth picks up a substantial amount of any particulate surface contamination. The amount of contamination is determined by measuring the reflectivity loss of the cloth before and after wiping on the contaminated system and comparing that loss to a previous calibration with similar contamination. In the alternative, a visual comparison of the contaminated cloth to a contamination key provides an indication of the surface cleanliness.
Schroder; Mark Stewart (Hendersonville, NC), Woodmansee; Donald Ernest (Simpsonville, SC), Beadie; Douglas Frank (Greenville, SC)
General Electric Company (Schenectady, NY)
09/ 888,535
June 26, 2001
This invention was made with Government support under Government contract No. DE-FC21-95-MC31176 awarded by the Department of Energy. The Government has certain rights in this invention.