Measurement of ferromagnetic impurities in non-magnetic aeroengine turbine disks using fluxgate magnetometers

(in lingua inglese)

In this case study, ferromagnetic inclusions on aeroengine turbine disks have been investigated. Three high sensitive and low noise fluxgate magnetometers have been interconnected to a gradiometer second order to remove any magnetic background fields. This sensor is located above the turbine disk that rotates on a turn table. Depending on the orientation, size, position and elongation of the impurities, various signatures are obtained during the rotation. In order to solve the inverse problem – to gain information of the impurities based on the measured flux densities – the simulation results of different measurement configurations are stored in a catalogue.