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Characterization of metal objects using polarizability tensor

Recent work has demonstrated that the response of a conductive object to a low frequency alternating magnetic field, in which the eddy current approximation is valid, can be approximated using a rank-2 tensor dependent only on the shape, size,, conductivity and permeability of the object. We present numerical and experimental examples of these polarizability tensors and the relevance of these findings to the location of low-metallic content anti-personnel land mines, and distinguishing them from other buried objects.

Author(s):

Paul Ledger    
Swansea University
United Kingdom

William Lionheart    
University of Manchester
United Kingdom