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Proceedings Paper

Measurement of the linear thermal expansion coefficient of gauge blocks by interferometry
Author(s): E. B. Hughes
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Paper Abstract

An absolute interferometric dilatometer is described. It has been designed to measure the linear thermal expansion coefficient of gauge blocks up to 125 mm long. The instrument uses an electrically heated oven to control the temperature of up to 10 gauges at temperatures between about 20 degree(s)C and 37 degree(s)C. A Fizeau interferometer is used to measure the length of the gauges in terms of the wavelengths of frequency stabilized He-Ne lasers using the method of exact fractions. Preliminary results indicate that the target uncertainty of +/- 1 X 10-7 K-1 for the thermal expansion coefficient can be achieved for 100 mm steel gauge blocks.

Paper Details

Date Published: 1 February 1993
PDF: 11 pages
Proc. SPIE 2088, Laser Dimensional Metrology: Recent Advances for Industrial Application, (1 February 1993); doi: 10.1117/12.168069
Show Author Affiliations
E. B. Hughes, National Physical Lab. (United Kingdom)


Published in SPIE Proceedings Vol. 2088:
Laser Dimensional Metrology: Recent Advances for Industrial Application

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