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International Society for Industrial Process Tomography

1st World Congress on Industrial Process Tomography

Status and Applications of Microelectrical Resistance Tomography

H. S. Tapp and R. A. Williams

Department of Mining and Mineral Engineering, University of Leeds, LS2 9JT

Tel: 0113 233 23 92

Fax: 0113 233 2781

Abstract - Electrical resistance tomography (ERT) is part of a suite of real-time low-cost two-dimensional imaging techniques which exploit the differences in the electrical properties of, for example, several flowing particulate systems. A physical sensor typically comprises an annular array of 16 electrodes mounted on a pipe wall such that the electrodes make electrical contact with the measured medium. Although the image fidelity is currently poor compared to X-ray tomography, the sensors can be scaled to suit the application. A microelectric resistance sensory system (MERT) is being developed for on-line interrogating down to 20-1000 micron length scales.

This paper reviews the development of microelectrical sensing systems and reconstruction and interpretation methods using as example, a feasibility study on a 56 mm diameter bore sensor. This illustrates the limitations in the widely employed procedure of employing generic tomographic sensors and image feature extraction methods to extract application specific control parameters.

Keywords: micro electrical resistance tomography, characterisation, particle and colloid suspensions, emulsions and pastes

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