ACCURATE LINEAR THERMAL EXPANSION COEFFICIENT DETERMINATION BY INTERFEROMETRY

Jarkko Unkuri, Jorma Manninen, Antti Lassila

Abstract

In precision length measurements the accurate and traceable value of the linear thermal expansion coefficient (LTEC) is needed. A device for interferometric determination of the LTEC of gauge blocks has been constructed. Minimum temperature gradients in a gauge block with 500 mm maximum length and relatively fast operation were the objectives of this project. Based on uncertainty analysis LTEC can be measured with a standard uncertainty of 0,02·10^-6 1/K for 100 mm gauge blocks.

Keywords

thermal expansion coefficient, interferometry, gauge block

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PWC-2003-TC2-018.pdf

DOI

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IMEKO TC

TC2 - Photonics

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