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Denoising time - domain induced polarisation data using wavelet techniques

Deo, Ravin N. and Cull, J.P. (2015) Denoising time - domain induced polarisation data using wavelet techniques. Exploration Geophysics, 47 (2). pp. 108-114. ISSN 0812-3985

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Abstract

Time-domain induced polarisation (TDIP) methods are routinely used for near-surface evaluations in quasi-urban environments harbouring networks of buried civil infrastructure. A conventional technique for improving signal to noise ratio in such environments is by using analogue or digital low-pass filtering followed by stacking and rectification. However, this induces large distortions in the processed data. In this study, we have conducted the first application of wavelet based denoising techniques for processing raw TDIP data. Our investigation included laboratory and field measurements to better understand the advantages and limitations of this technique. It was found that distortions arising from conventional filtering can be significantly avoided with the use of wavelet based denoising techniques. With recent advances in full-waveform acquisition and analysis, incorporation of wavelet denoising techniques can further enhance surveying capabilities. In this work, we present the rationale for utilising wavelet denoising methods and discuss some important implications, which can positively influence TDIP methods.

Item Type: Journal Article
Subjects: Q Science > QC Physics
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Engineering and Physics
Depositing User: Ratneel Deo
Date Deposited: 08 May 2015 16:30
Last Modified: 14 Sep 2016 15:06
URI: http://repository.usp.ac.fj/id/eprint/8233
UNSPECIFIED

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