Current pulse technique for electrical resistance tomography measurements

E. W. Randall, A. J. Wilkinson, J. J. Cilliers, W. Xie, S. J. Neethling

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Experiments were performed on a model system of a non-conducting object(s) in a conducting liquid. The performance of two reconstruction algorithms, linear back projection (LBP) and Newton-Raphson (NR), were compared. In the system where the conductivities are widely different, LBP can detect the position, but not the size of the object(s), while NR clearly delineates them.

A novel Electrical Resistance Tomography (ERT) measurement system has been developed, which uses a switched bi-directional constant current source to produce the electric field in the measuring vessel. Differential voltage measurements are made between the positive and negative current half cycles. This technique is considerably simpler than conventional systems involving the injection of sinusoidal current followed by asynchronous or DSP based detection. Further, because the current pulse is “DC”, the differential measurements do not require demodulating and therefore the technique has the potential for high-speed operation. The current pulse technique is justified in terms of the electrochemistry occurring at the electrodes and electronic circuitry used.

Original languageEnglish (US)
Title of host publication2nd World Congress on Industrial Process Tomography
PublisherInternational Society for Industrial Process Tomography
Number of pages9
ISBN (Electronic)9780853163183
StatePublished - 2014
Externally publishedYes
Event2nd World Congress on Industrial Process Tomography - Hannover, Germany
Duration: Aug 29 2001Aug 31 2001

Publication series

Name2nd World Congress on Industrial Process Tomography


Conference2nd World Congress on Industrial Process Tomography

Bibliographical note

Publisher Copyright:
© 2014 International Society for Industrial Process Tomography.


  • Direct current
  • ERT
  • Tomography


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