Contactless inductive flow tomography in the presence of electromagnetic brakes

The contactless inductive flow tomography (CIFT) is a measurement technique that reconstructs the global flow structure of an electrically conducting fluid. This works by applying a magnetic field, measuring the flow-induced perturbations of that field outside the vessel and solving the underlying inverse problem. A promising candidate for the application of CIFT is continuous casting of steel, for which online information of the mould flow could be vitally important to control the casting process with electromagnetic brakes (EMBr). We demonstrate that CIFT magnetic field measurements in the presence of EMBr's are possible in the laboratory scale using gradiometric induction coil sensors and choosing an appropriate excitation frequency.