An experimental study of Electrical Impedance Spectroscopy analysis of conductive liquids

Electrical impedance (EI) is a physical property of materials that can be used for elucidating directly or indirectly other physical parameters. In particular knowledge of EI properties of liquids has important implications for system identification, modelling, and control purposes in many areas of knowledge. One to the applications where EI can play an important role is tracing the propagation kinetics of liquids in porous media. This paper presents the results of experimental analysis of EI of liquids with different conductive properties to evaluate system identification procedures using data in the frequency range of 20 Hz to 30 MHz to obtain process models. The evaluation of the resulting process models suggests that it is possible to approximate the real frequency response of liquids with 92.36% average accuracy. The results suggest that a priori modelling of EI properties of liquids can be used to identify different types of liquids and can be used to facilitate the investigation of liquid propagation dynamics in porous media.