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Apparatus and method for measuring electrochemical impedance at high speed

  • US 6,339,334 B1
  • Filed: 02/22/2000
  • Issued: 01/15/2002
  • Est. Priority Date: 02/24/1999
  • Status: Expired due to Term
First Claim
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1. 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.

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