Advanced

Doubling the spectrum of time-domain induced polarization by harmonic de-noising, drift/spike removal and tapered gating

Fiandaca, Gianluca; Olsson, P. I. LU ; Larsen, J. J.; Dahlin, T. LU and Auken, Esben (2016) 22nd European Meeting of Environmental and Engineering Geophysics, Near Surface Geoscience 2016 In 22nd European Meeting of Environmental and Engineering Geophysics, Near Surface Geoscience 2016
Abstract

The extraction of spectral information in the inversion process of time-domain (TD) induced polarization (IP) data is changing the use of the TDIP method. Data interpretation is evolving from a qualitative description of the subsurface, able only to discriminate the presence of contrasts in chargeability parameters, towards a quantitative analysis of the investigated media, which allows for detailed soil-And rock-Type characterization. Two major limitations restrict the extraction of the spectral information of TDIP data in the field: i) the difficulty of acquiring reliable early-Time measurements, and ii) the selfpotential drift in the measured potentials distorting the shape of the late time. For measuring at early times, we developed... (More)

The extraction of spectral information in the inversion process of time-domain (TD) induced polarization (IP) data is changing the use of the TDIP method. Data interpretation is evolving from a qualitative description of the subsurface, able only to discriminate the presence of contrasts in chargeability parameters, towards a quantitative analysis of the investigated media, which allows for detailed soil-And rock-Type characterization. Two major limitations restrict the extraction of the spectral information of TDIP data in the field: i) the difficulty of acquiring reliable early-Time measurements, and ii) the selfpotential drift in the measured potentials distorting the shape of the late time. For measuring at early times, we developed a new method for removing harmonic noise from the data. Furthermore, a new scheme for spike removal was developed and tapered windows are used in the data gating. For measuring at late times, we developed a drift-removal scheme that model the polarization effect and allows for preserving the shape of the IP responses at late times. Overall, the removal of harmonic noise, spikes, self-potential drift, tapered windowing, and the uncertainty estimation allows for doubling the usable range of TDIP data to almost four decades in time.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
22nd European Meeting of Environmental and Engineering Geophysics, Near Surface Geoscience 2016
publisher
European Association of Geoscientists and Engineers, EAGE
conference name
22nd European Meeting of Environmental and Engineering Geophysics, Near Surface Geoscience 2016
external identifiers
  • scopus:85007308487
language
English
LU publication?
yes
id
17cf01b0-4ffd-4451-a76e-be28eb0de1eb
date added to LUP
2017-02-06 11:48:26
date last changed
2017-02-08 10:21:31
@inproceedings{17cf01b0-4ffd-4451-a76e-be28eb0de1eb,
  abstract     = {<p>The extraction of spectral information in the inversion process of time-domain (TD) induced polarization (IP) data is changing the use of the TDIP method. Data interpretation is evolving from a qualitative description of the subsurface, able only to discriminate the presence of contrasts in chargeability parameters, towards a quantitative analysis of the investigated media, which allows for detailed soil-And rock-Type characterization. Two major limitations restrict the extraction of the spectral information of TDIP data in the field: i) the difficulty of acquiring reliable early-Time measurements, and ii) the selfpotential drift in the measured potentials distorting the shape of the late time. For measuring at early times, we developed a new method for removing harmonic noise from the data. Furthermore, a new scheme for spike removal was developed and tapered windows are used in the data gating. For measuring at late times, we developed a drift-removal scheme that model the polarization effect and allows for preserving the shape of the IP responses at late times. Overall, the removal of harmonic noise, spikes, self-potential drift, tapered windowing, and the uncertainty estimation allows for doubling the usable range of TDIP data to almost four decades in time.</p>},
  author       = {Fiandaca, Gianluca and Olsson, P. I. and Larsen, J. J. and Dahlin, T. and Auken, Esben},
  booktitle    = {22nd European Meeting of Environmental and Engineering Geophysics, Near Surface Geoscience 2016},
  language     = {eng},
  publisher    = {European Association of Geoscientists and Engineers, EAGE},
  title        = {Doubling the spectrum of time-domain induced polarization by harmonic de-noising, drift/spike removal and tapered gating},
  year         = {2016},
}