Title :
Computation of modal decompositions for studying electromagnetic induction
Author :
McFadden, Michael ; Scott, Waymond R., Jr.
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
In this paper, a numerical method for calculating the wideband, low-frequency, eddy-current response of a metallic body-of-revolution is described. Solutions are given in a modal decomposition that can be related to the discrete spectrum of relaxation frequencies and the measured magnetic polarizability dyadic. Calculated responses are compared with the analytically known solution for a sphere and measured responses for a cylinder. A graph of the relaxation frequencies and moments for the two most dominant modes in a cylinder, given as a function of aspect ratio, is provided.
Keywords :
eddy currents; electromagnetic induction; geophysical techniques; polarisability; aspect ratio; discrete spectrum; electromagnetic induction; magnetic polarizability dyadic; metallic body-of-revolution; modal decomposition; numerical method; relaxation frequencies; wideband low-frequency eddy-current response; Eddy currents; Eigenvalues and eigenfunctions; Equations; Finite element methods; Frequency measurement; Scattering; Vectors;
Conference_Titel :
Geoscience and Remote Sensing Symposium (IGARSS), 2012 IEEE International
Conference_Location :
Munich
Print_ISBN :
978-1-4673-1160-1
Electronic_ISBN :
2153-6996
DOI :
10.1109/IGARSS.2012.6351529
