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Sensors 2009, 9(12), 10291-10308; doi:10.3390/s91210291
Article

Electrodynamics Sensor for the Image Reconstruction Process in an Electrical Charge Tomography System

1,* , 2
, 1
 and 3
1 Control and Instrumentation Engineering Department, Faculty of Electrical Engineering, Universiti Technologi Malaysia, 81310 Skudai, Johor Bharu, Johor, Malaysia 2 Department of Electrical Engineering, Politeknik Kota Bharu, KM.24 Kok Lanas, 16400 Ketereh, Kota Bharu, Kelantan, Malaysia 3 Department of General Studies, Politeknik Kota Bharu, KM.24 Kok Lanas, 16400 Ketereh, Kota Bharu, Kelantan, Malaysia
* Author to whom correspondence should be addressed.
Received: 28 October 2009 / Revised: 24 November 2009 / Accepted: 6 December 2009 / Published: 18 December 2009
(This article belongs to the Section Physical Sensors)
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Abstract

Electrical charge tomography (EChT) is a non-invasive imaging technique that is aimed to reconstruct the image of materials being conveyed based on data measured by an electrodynamics sensor installed around the pipe. Image reconstruction in electrical charge tomography is vital and has not been widely studied before. Three methods have been introduced before, namely the linear back projection method, the filtered back projection method and the least square method. These methods normally face ill-posed problems and their solutions are unstable and inaccurate. In order to ensure the stability and accuracy, a special solution should be applied to obtain a meaningful image reconstruction result. In this paper, a new image reconstruction method – Least squares with regularization (LSR) will be introduced to reconstruct the image of material in a gravity mode conveyor pipeline for electrical charge tomography. Numerical analysis results based on simulation data indicated that this algorithm efficiently overcomes the numerical instability. The results show that the accuracy of the reconstruction images obtained using the proposed algorithm was enhanced and similar to the image captured by a CCD Camera. As a result, an efficient method for electrical charge tomography image qreconstruction has been introduced.
Keywords: image reconstruction; electrodynamics sensor; linear back projectios; filter back projectios; least squares with regularization; CCD-Camera image reconstruction; electrodynamics sensor; linear back projectios; filter back projectios; least squares with regularization; CCD-Camera
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Rahmat, M.F.; Isa, M.D.; Rahim, R.A.; Hussin, T.A.R. Electrodynamics Sensor for the Image Reconstruction Process in an Electrical Charge Tomography System. Sensors 2009, 9, 10291-10308.

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