An electrical capacitance tomography

Abstract

This paper repons an o study of determining the capacitiiiicc frotn [lit given permittivity patterns and describes thc image recmsrructioii method for Electrical capacitance Tomography (ECT). The model described i n this paper is a sqiiare abject with 8 electrodcr. The finite difference method and Gauss's l a w iirc used for calculating numerically the capacitance of the system. Linear back-projection is then utilized for the image reconstruction. To improve the image qualities. the iterarive algorithm and tlhe thresholding arc applied. The experimcnral results show that tlhe capacitance are readily evaluated and the reconstructed images are closely resemble the original images.

Application of ECT to solid concentration measurements during granular flow in a rectangular model silo

“…The ECT sensors have also been applied in rectangular containers by other researchers (e.g. Yang and Liu, 1999;Wang et al, 2003;Yossontikul et al, 2002;Rerkratn et al, 2006), but they have been used to measure solid concentration changes in materials significantly different than sand (e.g. polymer granulate, vegetable oil with a teflon stick) and during static problems.…”