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# Manufacturing: Precision Engineering; Metrology of Small Holes

NIST researchers and collaborators have developed a new method for measuring the interior dimensions of small holes with an uncertainty of only 35 nanometers. Here, a glass probe is inserted into an optical "ferrule," a device for connecting optical fibers used in communications systems.

*MEL, stents, holes, coordinate measuring machine, precision parts, dimensional metrology

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June 6, 2005

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