Method and apparatus for determining conductivity based on electromagnetic inductance spectroscopy

Peyton, Anthony, O'Toole, Michael and Karimian, Noushin (2018) Method and apparatus for determining conductivity based on electromagnetic inductance spectroscopy. WO 2018/203055 A1. [Patent]

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Abstract

Embodiments of the present invention provide a method of and an apparatus for determining conductivity of a metal target. An interrogation magnetic field is provided and induces an electrical current in the metal target. A resultant magnetic field is generated by the electrical current. In-phase and out-of-phase components of the resultant magnetic field are determined for the target at a first frequency (conductivity limit due to skin depth) and a second frequency of the interrogation magnetic field respectively. The conductivity of the metal target is determined based on the in-phase and out-of-phase components at the first and second frequencies.