30 April 2018 Modeling the broadband electromagnetic induction response of three-dimensional targets
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Broadband electromagnetic induction sensors are effective at detecting and classifying buried metal. Electromagnetic induction sensors operate by exciting eddy currents in conducting targets using a primary magnetic field and measuring the scattered magnetic response. Broadband sensors gather increased information about the flow of eddy currents relative to narrowband sensors. A dipole model can be fitted to the scattered response, which allows the scattering mechanism to be represented using a frequency-dependent magnetic polarizability tensor. This tensor can be decomposed into a pole expansion of frequency-independent tensors, which represent the scattering of the natural modes of the eddy current problem, and a corresponding relaxation frequency that characterizes the mode’s exponential decay in time. The pole-expansion coefficients are valuable for target classification and for discriminating targets from clutter. In this paper, a volume integral method is used to compute the pole-expansion coefficient of a few canonical three-dimensional targets. These coefficients can be used to compute the eddy-current response of a larger subset of targets.
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Jonathan E. Gabbay, Jonathan E. Gabbay, Waymond R. Scott, Waymond R. Scott, } "Modeling the broadband electromagnetic induction response of three-dimensional targets", Proc. SPIE 10628, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XXIII, 106280P (30 April 2018); doi: 10.1117/12.2305425; https://doi.org/10.1117/12.2305425

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