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Uncertainties in Dimensional Measurements Made at Nonstandard Temperatures

Published

Author(s)

Dennis A. Swyt

Abstract

This report examines the effects of uncertainties in temperature and coefficient of thermal expansion on the expanded uncertainty of length dimensional measurements made away from the international standard reference temperature of 20degrees C for artifact standards and workpieces of various materials. Specific cases examined deal with: (1) uncertainties of thermal-expansion coefficients associated with values given in engineering references, standard reference data, standard reference materials and direct measurements; and (2) uncertainties of part temperature measurements associated with realizing the International Temperature sale of 1990 (ITS-90) and determining part temperatures relative to ITS-90 with the principal types of thermometry and achievable levels of temperature control.
Citation
Journal of Research of the National Institute of Standards and Technology
Volume
99
Issue
1

Keywords

dimensional measurement, dimensional tolerances, length metrology, measurement uncertainty, reference temperature, thermal expansion

Citation

Swyt, D. (1994), Uncertainties in Dimensional Measurements Made at Nonstandard Temperatures, Journal of Research of the National Institute of Standards and Technology (Accessed May 23, 2024)

Issues

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Created January 1, 1994, Updated February 19, 2017