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Microwave measurements for gas thermometry up to the copper point

Published

Author(s)

XiaoJuan Feng, Keith A. Gillis, Michael R. Moldover, James B. Mehl

Abstract

We measured 5 microwave resonance frequencies fN of an argon-filled cylindrical cavity at temperatures up to 1349 K. The repeatability of both the measured frequencies u(fN) and the scaled half-widths u(gN)/ fN was better than 10-6fN. The measurement techniques are compatible with highly accurate acoustic gas thermometry up to the copper point at 1358 K and might be adaptable to refractive index gas thermometry.
Citation
Metrologia
Volume
50
Issue
3

Keywords

acoustic thermometry, primary thermometry, temperature scale, high temperatures, coaxial cables, acoustic resonator, microwave cavity resonator, speed of sound
Created May 13, 2013, Updated February 19, 2017