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Finite Element Modelling of a Cellular Electric Microenvironment
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Interface and permittivity simultaneous reconstruction in electrical capacitance tomography based on boundary and

Shangjie Ren1, Feng Dong2

  • 1Tianjin Key Laboratory of Process Measurement and Control, School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|May 18, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for Electrical Capacitance Tomography (ECT) to image inside pipes even with wall deposits. The technique simultaneously reconstructs the internal permittivity and the deposit layer

Keywords:
block coordinate descent methodboundary and finite-elements coupling methoddeposit layer detectionelectrical capacitance tomographyinterface and permittivity simultaneous reconstruction

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Area of Science:

  • Process Tomography
  • Non-destructive Testing
  • Electrical Engineering

Background:

  • Electrical Capacitance Tomography (ECT) is a non-destructive imaging technique using boundary capacitance measurements to visualize internal permittivity distributions.
  • ECT offers advantages like non-contact operation, no radiation, high speed, and low cost, making it suitable for industrial and biological processes.
  • A common challenge in ECT applications is the presence of deposit layers on inner walls, which can significantly shield the region of interest (ROI) and hinder accurate imaging.

Purpose of the Study:

  • To develop a novel approach for simultaneous reconstruction of both the permittivity distribution within the ROI and the geometry of the surrounding deposit layer.
  • To overcome the limitations imposed by the shielding effect of deposits in ECT measurements.
  • To improve the accuracy and feasibility of ECT imaging in industrial and biological systems with wall deposits.

Main Methods:

  • An interface and permittivity simultaneous reconstruction approach was proposed.
  • The block coordinate descent method was utilized for recovering both the permittivity at the ROI and the deposit layer's geometry.
  • A boundary and finite-elements coupling method was employed to enhance computational efficiency.

Main Results:

  • The proposed method demonstrated the capability to simultaneously reconstruct the permittivity distribution and the deposit layer's geometry.
  • Simulation tests validated the performance of the simultaneous reconstruction approach in overcoming the shielding effect.
  • The method showed promise in improving ECT imaging accuracy in the presence of significant permittivity differences between the deposit and ROI.

Conclusions:

  • The developed interface and permittivity simultaneous reconstruction method effectively addresses the challenges posed by deposit layers in ECT.
  • This approach enhances the applicability of ECT for monitoring industrial and biological processes where wall deposits are present.
  • The findings contribute to advancing supersensing capabilities through industrial process tomography.