Development of innovative non-destructive methods for the evaluation of the structural integrity using broadband electromagnetic fields

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This study developed a method to significantly enhance the information contained in signals of non-destructive methods using time-dependent electromagnetic fields. Numerical simulations and experimental verifications were carried out to fully reveal the physical background of the method applied to kHz electromagnetic fields. They also evaluated the applicable limit of the method, and confirmed that the magnetic property of the target would enable to make probes smaller. Studies for the application to GHz electromagnetic fields demonstrated that controlling electromagnetic fields leads to a significant improvement of signal-to-noise ratio.