Patent ID: 6339334
Filing Date: 2002-01-15
Classification: G01N

Abstract:
A method for measuring electrochemical impedance of an electrolyte at high speed comprising:(a) applying a direct current (DC) voltage having the reaction potential value of an electrolyte to the electrolyte via a counter electrode and, after a delay, applying a signal voltage, including the DC voltage plus a differentiated or integrated Dirac-delta function voltage, to the electrolyte; (b) computing a digital data value related only to the differentiated or integrated Dirac-delta function tion voltage from among digital data, obtained by converting a signal current flowing in a working electrode via the electrolyte into a voltage, integrating or differentiating the voltage, and Fourier transforming the voltage after integrating or differentiating to produce a Fourier transformed value; and (c) obtaining changes in magnitude and phase, as a function of frequency based on the Fourier transformed value and thereby determining the impedance.