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- W132698059 abstract "Industrial companies often use large steel tanks to store all kind of liquids. Due to stressand weather influences the tanks protecting coating can get damaged and corrosion can occur.Corrosion is an auto-catalytic chemical process that needs to be detected in an early stageto prevent leakage. A scanner has been developed to detect these corrosion pits by means ofeddy currents. The scanner uses 2 active coils in bridge configuration to generate time-varyingelectromagnetic fields and measure responses. Magnets are used to magnetize the steel plateunder investigation. Magnetization mitigates magnetic inhomogeneities and increases scanningdepth. Based on the difference in complex impedance of the coils conclusions can be drawnabout the condition of the steel.Although eddy current testing is a powerful method it appears to be hard to interpret signalsof non-artificial defects. Therefore it is needed to gain more knowledge about eddy currentresponses. In this project a software model has been implemented using the finite differencetime domain technique. This technique is especially developed for electromagnetic problemsand calculated propagating waves in the time domain.Simulation results of artificial defects in unmagnetized steel show equivalent responses comparedto measurements. A magnetization process has been implemented, but it has instability issueswhen using non-linearities. The model can be further improved by implementing properties ofcorrosion and optimizing calculations." @default.
- W132698059 created "2016-06-24" @default.
- W132698059 creator A5045098185 @default.
- W132698059 date "2009-01-01" @default.
- W132698059 modified "2023-09-27" @default.
- W132698059 title "A finite difference time domain model of an eddy current based measurement system" @default.
- W132698059 hasPublicationYear "2009" @default.
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