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International Society for Industrial Process Tomography

3rd World Congress on Industrial Process Tomography

The Design of a 1000 Frames/Second ERT Data Capture System and Calibration Techniques Employed


A J Wilkinson1, E W Randall2, D Durrett1, T Naidoo1, J J Cilliers3


1 Department of Electrical Engineering, University of Cape Town, Private Bag, Rondebosch 7701, South Africa, ajw@eng.uct.ac.za

2 Department of Chemical Engineering, University of Cape Town

3 Department of Chemical Engineering, UMIST, Manchester, UK


ABSTRACT


The design of a pulsed bi-directional DC system for ERT measurement was reported at the 2nd World Tomography Conference. It was suggested that this simple and low cost method would have the potential for high-speed operation. This paper describes such a system and presents data that verifies its operation. A calibration technique is described which improves the sensitivity of the current pulse measuring system and allows phenomena such as gas distribution in aeration systems to be investigated. Further more, the calibration scheme compensates for the effect of impellers and baffles present in the measuring tank and allows more accurate reconstructions to be performed in the areas of interest without having to explicitly include them in the FEM model.


Keywords ERT, Current-pulse, High speed, Calibration

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