Advances in Electrical Capacitance Tomography System

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Artificial Intelligence Circuits and Systems (AICAS)".

Deadline for manuscript submissions: closed (20 November 2022) | Viewed by 4803

Special Issue Editors


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Guest Editor
Faculty of Electronics and Information Technology, Warsaw University of Technology, 00-665 Warsaw, Poland
Interests: electrical capacitance tomography; signal conditioning; 3D sensor; capacitance measurement circuit

E-Mail Website
Guest Editor
Faculty of Electronics and Information Technology, Warsaw University of Technology, 00-665 Warsaw, Poland
Interests: electrical capacitance tomography; magnetic susceptibility; capacitance measurement circuit

Special Issue Information

Dear Colleagues, 

Electrical Capacitance Tomography (ECT) has found application as a process visualization tool in chemical engineering, especially in multiphase flow monitoring. The possibility of using this technique in medical imaging using contactless electrodes is being investigated. However, the imaging quality and performance of ECT systems currently available are limited due to low spatial sampling, low sensitivity, and nonlinearity of the tomographic inverse problem. Several research groups are conducting new studies in sensor design, capacitance measurement methods, hardware development, digital signal processing, and image reconstruction to improve image quality.

This special issue intends to highlight the research that supports the development of the theories and technologies underlying the design of ECT systems. Both theoretical contributions and practical validations are essential. Topics of interest include, but are not limited to:

  • 2D and 3D capacitance sensor design and modeling
  • methods of capacitance measurement and signal conditioning
  • complex-valued capacitance measurement and multi-modal imaging
  • data acquisition system architecture for real-time imaging
  • high-speed nonlinear image reconstruction
  • image processing and process control

Prof. Dr. Waldemar Smolik
Dr. Jacek Kryszyn
Guest Editors

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Published Papers (2 papers)

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Research

19 pages, 7043 KiB  
Article
Numerical Evaluation of Complex Capacitance Measurement Using Pulse Excitation in Electrical Capacitance Tomography
by Damian Wanta, Oliwia Makowiecka, Waldemar T. Smolik, Jacek Kryszyn, Grzegorz Domański, Mateusz Midura and Przemysław Wróblewski
Electronics 2022, 11(12), 1864; https://doi.org/10.3390/electronics11121864 - 13 Jun 2022
Cited by 6 | Viewed by 1908
Abstract
Electrical capacitance tomography (ECT) is a technique of imaging the distribution of permittivity inside an object under test. Capacitance is measured between the electrodes surrounding the object, and the image is reconstructed from these data by solving the inverse problem. Although both sinusoidal [...] Read more.
Electrical capacitance tomography (ECT) is a technique of imaging the distribution of permittivity inside an object under test. Capacitance is measured between the electrodes surrounding the object, and the image is reconstructed from these data by solving the inverse problem. Although both sinusoidal excitation and pulse excitation are used in the sensing circuit, only the AC method is used to measure both components of complex capacitance. In this article, a novel method of complex capacitance measurement using pulse excitation is proposed for ECT. The real and imaginary components are calculated from digital samples of the integrator response. A pulse shape in the front-end circuit was analyzed using the Laplace transform. The numerical simulations of the electric field inside the imaging volume as well as simulations of a pulse excitation in the front-end circuit were performed. The calculation of real and imaginary components using digital samples of the output signal was verified. The permittivity and conductivity images reconstructed for the test object were presented. The method enables imaging of permittivity and conductivity spatial distributions using capacitively coupled electrodes and may be an alternative measurement method for ECT as well as for electrical impedance tomography. Full article
(This article belongs to the Special Issue Advances in Electrical Capacitance Tomography System)
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20 pages, 6328 KiB  
Article
A Run-Time Reconfiguration Method for an FPGA-Based Electrical Capacitance Tomography System
by Damian Wanta, Waldemar T. Smolik, Jacek Kryszyn, Przemysław Wróblewski and Mateusz Midura
Electronics 2022, 11(4), 545; https://doi.org/10.3390/electronics11040545 - 11 Feb 2022
Cited by 7 | Viewed by 2297
Abstract
A desirable feature of an electrical capacitance tomography system is the adaptation possibility to any sensor configuration and measurement mode. A run-time reconfiguration of a system for electrical capacitance tomography is presented. An original mechanism is elaborated to reconfigure, on the fly, a [...] Read more.
A desirable feature of an electrical capacitance tomography system is the adaptation possibility to any sensor configuration and measurement mode. A run-time reconfiguration of a system for electrical capacitance tomography is presented. An original mechanism is elaborated to reconfigure, on the fly, a modular EVT4 system with multiple FPGAs installed. The outlined system architecture is based on FPGA programmable logic devices (Xilinx Spartan) and PicoBlaze soft-core processors. Soft-core processors are used for communication, measurement control and data preprocessing. A novel method of FPGA partial reconfiguration is described, in which a PicoBlaze soft-core processor is used as a reconfiguration controller. Behavioral reconfiguration of the system is obtained by providing run-time access to the program code of a soft-core control processor. The tests using EVT4 hardware and different algorithms for tomographic scanning were performed. A test object was measured using 2D and 3D sensors. The time and resources required for the examined reconfiguration procedure are evaluated. Full article
(This article belongs to the Special Issue Advances in Electrical Capacitance Tomography System)
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