Electromagnetic visualization technique for non-metallic inclusions in a melt

The detection of inclusions in hot melts is of great importance to the manufacturing process as every aspect of quality is affected by the presence of second phases. However, the major dilemma is how to quantitatively determine the level of inclusions. In this paper, we present a theoretical model and preliminary experimental results of a Lorentz-force-based detection system to monitor small inclusions of micron size. The developed technique potentially has a better resolution performance than other on-line methods. The application area includes hot melts of metals and other highly conductive non-transparent fluids. Low-temperature modelling with liquid gallium was used to prove the measurement concept.