An Electrical Capacitance Tomography System with Double Measurement Channels

2011 ◽  
Vol 204-210 ◽  
pp. 1314-1317
Author(s):  
Hua Yan ◽  
Jun Wang ◽  
Ying Gang Zhou
Keyword(s):  
Electrical Capacitance Tomography ◽  
Electrical Capacitance ◽  
Single Measurement ◽  
Idle Mode ◽  
Tomography System ◽  
Mode Detection ◽  
Detection Mode ◽  
Measurement Channels ◽  
Capacitance Tomography ◽  
Double Measurement

An ECT data acquisition system usually has N-1 measurement channels or single measurement channel. In order to solve the contradiction between system speed and system cost, a 16-electrode electrical capacitance tomography system with double measurement channels has been designed. It has good anti-noise ability and stray-immunity by using ac-based capacitance measuring circuits. A switch network is used to set each electrode at excitation mode, detection mode or idle mode. The influence of switch coupling capacitances is discussed and its soft compensation method is proposed. By using LabVIEW, remote monitoring and distributing data or images over network can be implemented easily.

Electric Potential Distribution of Electrical Capacitance Tomography System at the Centre of Pipe Based on Segmented Excitation

2013 ◽  
Vol 64 (5) ◽  
Author(s):  
Shahrulnizahani Mohammad Din ◽  
Ruzairi Abdul Rahim ◽  
Leow Pei Ling
Keyword(s):  
Electric Potential ◽  
Pipe Flow ◽  
Potential Distribution ◽  
Electrical Potential ◽  
Comsol Multiphysics ◽  
Electrical Capacitance Tomography ◽  
Electrical Capacitance ◽  
Tomography System ◽  
Resolution Problem ◽  
Capacitance Tomography

Electrical capacitance tomography (ECT) is one of the systems used to inspect closed pipe flow. This paper will present the proposed segmented excitation of electrodes with a focus on the low resolution problem.  Modelling of 8, 12 and 16 electrodes is done using COMSOL Multiphysics. The number of excitation electrodes is increased until half of the electrodes are excited at the same time. The electrical potential distribution is analyzed and the voltage value at the centre of the pipe is captured. The results show that there is improvement of electrical potential and voltage value in proportion to the number of electrodes excited at the same.

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