Direct Capacitance Measurement for Tomographic
Imaging of Metallic Object
I. Muttakin*, M. Soleimani
Engineering Tomography Laboratory
University of Bath, Claverton Down, Bath, BA2 7AY, United Kingdom
The paper proposes a method of metallic object imaging using capacitance measurement. Direct sigma-delta conversion has been employed for high resolution capacitive sensing, and the resulting data can be reconstructed to produce tomographic image. Set of copper-plate electrodes excited sequentially by alternating current voltage source generate fields which interact with material enclosed in region. Each capturing electrode is connected to the designed module capable of measuring lossy capacitance. Illusion of dielectric properties can be extracted and post-processed to determine boundary of metal presence against background. Experiment results show cross section images in which metallic object is distinctive down to 19.36% of inclusion. This study paves opportunities to implement electrical tomography modalities in metallurgical process. Further application in precision steel manufacturing control is feasible.
Keywords capacitance, imaging, metal, process, tomography
Industrial Application General
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