Analysis of Electrical Parameters of Liquids in a Coaxial Cell at Varying Temperatures

Abstract

Determination of the electrophysical properties of materials is relevant to many areas of human activity. Methods, approaches and devices are improving, the use of which makes it possible to estimate the electrophysical properties of liquids depending on different parameters. This work presents the analysis of the electrical parameters of liquids with different chemical composition in a coaxial cell in a wide frequency range when the temperature changes. The analysis is based on the S-parameters of liquids measured with a vector circuit analyzer in the frequency range up to 12 GHz, placed inside the coaxial cell, which temperature is set by the heat-cold chamber in the range from 0 to 50 °C. The changes in frequency dependences of liquids S-parameters detected using the above approach indicate their characteristic features occurring at certain frequencies. To investigate the influence of liquids temperature on changes in their electrophysical parameters, we have applied the method of principal components. This method has revealed the relationship between chemical composition of liquids and their representation in the space of principal components.