Thermisch-Elektrische Impedanzspektroskopie zur Charakterisierung von Fluiden und für die Prozessüberwachung

Abstract

Electrical impedance spectroscopy (dielectric or electrochemical impedance spectroscopy) is a widespread characterization method for solids or fluids in industrial applications. A wider understanding of the compositions of the tested substance can easily be obtained by combining the electrical with a thermal impedance spectroscopy. The thermal analogue of the EIS utilise a heating element in contact with the test substance that is periodically heated, measuring the require temperature amplitude. It is an adaption of the well-known 3-Omega-Method [1]. Additionally to the electrical properties like conductivity, capacity etc. changes of the thermal properties like thermal conductivity, thermal capacity or the density are measurable