Dimitrakis, G A*; George, M*; Poliakoff, M*; Harrison, I*; Robinson, J*; Kingman, S*; Lester, E*; Gregory, A P; Lees, K (2009) A system for traceable measurement of the microwave complex permittivity of liquids at high pressures and temperatures. Meas. Sci. Technol., 20 (4). 045901

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Abstract

A system has been developed for direct traceable dielectric measurements on liquids at high pressures and temperatures. The system consists of a coaxial reflectometric sensor terminated by a metallic cylindrical cell to contain the liquid. It has been designed to be used for measurements on supercritical liquids, but as a first step measurements on dielectric reference liquids were performed. This paper reports on a full evaluation of the system up to 2.5 GHz using methanol, ethanol and n-propanol at pressures up to 9 MPa and temperatures up to 273 ºC. A comprehensive approach to the evaluation of uncertainties using Monte-Carlo Modeling is used.

Item Type:	Article
Keywords:	Dielectrics, Permitivity
Subjects:	Advanced Materials
Last Modified:	02 Feb 2018 13:15
URI:	http://eprintspublications.npl.co.uk/id/eprint/4395

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