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Fast and Precise Soft-Field Electromagnetic Tomography Systems for Multiphase Flow Imaging

Author

Listed:
  • Malte Mallach

    (Ruhr-University Bochum, Institute of Electronic Circuits, Universitätsstrasse 150, 44780 Bochum, Germany)

  • Martin Gevers

    (Ruhr-University Bochum, Institute of Electronic Circuits, Universitätsstrasse 150, 44780 Bochum, Germany)

  • Patrik Gebhardt

    (Ruhr-University Bochum, Institute of Electronic Circuits, Universitätsstrasse 150, 44780 Bochum, Germany)

  • Thomas Musch

    (Ruhr-University Bochum, Institute of Electronic Circuits, Universitätsstrasse 150, 44780 Bochum, Germany)

Abstract

In the process industry, measurement systems are required for process development and optimization, as well as for monitoring and control. The processes often involve multiphase mixtures or flows that can be analyzed using tomography systems, which visualize the spatial material distribution within a certain measurement domain, e.g., a process pipe. In recent years, we studied the applicability of soft-field electromagnetic tomography methods for multiphase flow imaging, focusing on concepts for high-speed data acquisition and image reconstruction. Different non-intrusive electrical impedance and microwave tomography systems were developed at our institute, which are sensitive to the local contrasts of the electrical properties of the materials. These systems offer a very high measurement and image reconstruction rate of up to 1000 frames per second in conjunction with a dynamic range of up to 120 dB. This paper provides an overview of the underlying concepts and recent improvements in terms of sensor design, data acquisition and signal processing. We introduce a generalized description for modeling the electromagnetic behavior of the different sensors based on the finite element method (FEM) and for the reconstruction of the electrical property distribution using the Gauss–Newton method and Newton’s one-step error reconstructor (NOSER) algorithm. Finally, we exemplify the applicability of the systems for different measurement scenarios. They are suitable for the analysis of rapidly-changing inhomogeneous scenarios, where a relatively low spatial resolution is sufficient.

Suggested Citation

  • Malte Mallach & Martin Gevers & Patrik Gebhardt & Thomas Musch, 2018. "Fast and Precise Soft-Field Electromagnetic Tomography Systems for Multiphase Flow Imaging," Energies, MDPI, vol. 11(5), pages 1-17, May.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:5:p:1199-:d:145331
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    Citations

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    Cited by:

    1. Lars Zigan, 2018. "Electric Fields in Energy and Process Engineering," Energies, MDPI, vol. 11(9), pages 1-4, August.
    2. Lars Zigan, 2018. "Overview of Electric Field Applications in Energy and Process Engineering," Energies, MDPI, vol. 11(6), pages 1-33, May.
    3. Artur S. Bartosik, 2023. "Effect of the Solid Particle Diameter on Frictional Loss and Heat Exchange in a Turbulent Slurry Flow: Experiments and Predictions in a Vertical Pipe," Energies, MDPI, vol. 16(18), pages 1-21, September.
    4. Jan Porzuczek, 2021. "Multifrequency Impedance Tomography System for Research on Environmental and Thermal Processes," Energies, MDPI, vol. 14(19), pages 1-17, October.

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