Correlation method for determination of the time constants of impedances applied to electrical model networks and to a liquid capacitor

Abstract

A correlation method is described for analysis of electrical impedances. The impedance is investigated as part of a four-terminal network, allowing general system analysis techniques to be applied. With a pseudorandom noise signal as input the measured cross-correlation function corresponds, under certain conditions, to the impulse response of the four-terminal network and contains the information about the network components via the time constants of the four-terminal network. The method has been applied to electrical two-terminal networks and to a liquid capacitor filled with a solution of poly- gamma -benzyl-L-glutamate in 1,2-dichloroethane. The latter application demonstrates that information on the dynamic behaviour of a chemical system and its changes with time can be obtained directly.