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Apparatus and methods for measuring permeability and conductivity in materials using multiple wavenumber magnetic interrogations

  • US 5,015,951 A
  • Filed: 03/20/1989
  • Issued: 05/14/1991
  • Est. Priority Date: 10/02/1987
  • Status: Expired
First Claim
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1. An apparatus for measuring a property of a material, the apparatus comprising:

  • an array of electromagnetic elements capable of imposing a magnetic field in a material and sensing a resulting electromagnetic response;

    a wavenumber controller connected to said array for applying a current to subsets of said electromagnetic elements and thereby defining fundamental wavenumbers associated with said imposed magnetic field in the material; and

    an analyzer connected to said wavenumber controller, including means for comparing the resulting responses sensed by said electromagnetic array at different wavenumbers to predictions in order to derive a spatial profile of complex permeability or conductivity in the material.

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