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Vol. 135, Issue 12, December 2011, pp.20-26




An Overview: Effectiveness of Different Arrangement for Electrode Guard in Electrical Capacitance Tomography

1 Mohd Fadzli B Abd Shaib, 1 Elmy Johana Mohamad, 2 Ruzairi Abdul Rahim,
1 Mahadi B Abd Jamil, 2 Leow Pei Ling

1 Faculty of Electrical and Electronic Engineering, Universiti Tun Hussein Onn,

Malaysia, 86400 Parit Raja, Batu Pahat, Johor, Malaysia

2 Process Tomography & Instrumentation Research Group, Cybernetics Research Alliance,
 Faculty of Electrical Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia

E-mail: fadzli@uthm.edu.my, elmy@uthm.edu.my, mahadi@uthm.edu.my, ruzairi@fke.utm.my, leowpl@fke.utm.my



Received: 7 September 2011   /Accepted: 16 December 2011   /Published: 28 December 2011

Handbook of Laboaratory Measurements book


Abstract: Electrical capacitance tomography (ECT) system is useful to obtain information about the spatial distribution of a dielectric materials mixture inside a vessel. It has been suggested by many researchers previously to use guard electrode in ECT sensors. This paper describes various types of design for guard electrode in Electrical Capacitance Tomography (ECT) sensor. The design of these electrode guards is vital to reduce crosstalk (undesired signals) between the adjacent electrodes (positioned at the outside of the measured pipe) since the crucial signals are only inside the pipe. There are three types of electrode guards designed by various researchers which are radial guard, axial guard with end guard and driven guard. The configuration and the effectiveness of each designed electrode are discussed. Other than that this paper introduced new design of electrode guards which are embedded on electrode sensor instead of placing separately between or around adjacent measuring electrodes as the previous design.


Keywords: Guard, Electrode, Arrangement, Effectiveness, ECT


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