Application of the inverse wavelet transform on electrochemical current signals to demonstrate the essence of high‐frequency variations

Abstract

Purpose

One way to analyze electrochemical signals is the wavelet transform, which transforms a signal into another representation whereby the signal information is presented in a multi‐scale manner. Using the inverse wavelet transform, it is also possible to split a signal into different components of different frequency intervals. The inverse wavelet transform is the concept underpinning this paper, the aim of which is to demonstrate that high‐frequency variations in current signals are as valuable as low‐frequency variations.

Design/methodology/approach

The set‐up for the experiments carried out consisted of two identical carbon steel working electrodes exposed to simulated concrete pore solution, sparged simultaneously with SO₂ and CO₂. The corresponding electrochemical current signal was studied using wavelet transform.

Findings

High‐frequency components of current signals are as informative as low‐frequency components. High‐frequency variations could show some electrochemical activities that are not obvious in the other parts.

Originality/value

This paper shows that high‐frequency variations can be taken into consideration along with low‐frequency variations, since both can provide complementary information about electrochemical activities.

Citation

Khodayari, M., Reza Allahkaram, S. and Volinsky, A.A. (2010), "Application of the inverse wavelet transform on electrochemical current signals to demonstrate the essence of high‐frequency variations", Anti-Corrosion Methods and Materials, Vol. 57 No. 2, pp. 65-69. https://doi.org/10.1108/00035591011028023