NASA NTRS · 19900000022
Using Ruby Balls As Fiducial Marks
Abstract
Combination of basic and advanced techniques yields new capability for inspection. In new technique, surface first inspected with fluorescent penetrant dye to reveal flaws. Ruby ball of known diameter placed near flaw having to be measured. Flaw and ball observed through magnifying video system that can "freeze" image.
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Painter, Nance M.. 1990-01-01. Using Ruby Balls As Fiducial Marks. https://ntrs.nasa.gov/citations/19900000022
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