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Toroidal Cross-Capacitor for Measuring the Dielectric Constant of Gases

Published

Author(s)

T J. Buckley, J O. Hamelin, Michael R. Moldover

Abstract

We describe toroidal cross capacitors built to accurately measure the dielectric constant of gases. We tested the capacitors by measuring the dielectric polarizability of helium and argon at 7 and 50 degrees C at pressures up to 3 MPa. For helium, the results are consistent with the ab initio calculation of the molar polarizability and are limited by the uncertainties of the capacitance measurements. For argon, the results are consistent with the best previously published measurements of the polarizability and are limited by the uncertainties of the pressure measurements. Lessons learned are provided.
Citation
Review of Scientific Instruments
Volume
71
Issue
No. 7

Keywords

argon, capacitor, cross capacitor, dielectric constant, helium, molar polarizability, pressure, pressure standard

Citation

Buckley, T. , Hamelin, J. and Moldover, M. (2000), Toroidal Cross-Capacitor for Measuring the Dielectric Constant of Gases, Review of Scientific Instruments (Accessed June 14, 2024)

Issues

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Created July 1, 2000, Updated February 17, 2017