Development of Electromagnetic Tomography (EMT) for Industrial Applications.Part 2: Image Reconstruction and Software Framework

A R Borges1, J E de Oliveira1, J Velez1, C Tavares1, F Linhares1, A J Peyton2 1 INESC-Aveiro, Portugal, ruib@inesca.inesca.pt

2 Engineering Department, Lancaster University, UK, a.peyton@lancaster.ac.uk

Abstract - This paper is the second of two parts and reviews results of a recently completed project based at the University of Aveiro, UMIST and the University of Lancaster. This research represents a fundamental investigation of the potential of using electromagnetic inductance measurements for industrial tomographic applications.

This second paper concentrates on image reconstruction and software related issues and follows on from hardware related topics described in the first part. The systems studied can image the distribution of either electrically conducting material (D > 1 S/m) and / or magnetically permeable materials (DR >1). The technique has analogies with other forms of electrical tomography such as those based on resistance or capacitance methods. The paper describes several general approaches to image reconstruction, the development of particular image reconstruction algorithms, and the performance of the system in terms of image resolution and image capture and reconstruction rates. The system is controlled from a distributed software framework, which is also presented briefly. Finally a number of potential industrial applications for the EMT technique are discussed.

Keywords : Sensors, Tomography, Electromagnetic inductance, Image reconstruction