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Flux focusing eddy current probe

  • US 5,617,024 A
  • Filed: 05/08/1996
  • Issued: 04/01/1997
  • Est. Priority Date: 10/12/1993
  • Status: Expired due to Fees
First Claim
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1. A flux-focusing eddy current probe for non-destructive evaluation of an electrically conductive material comprising:

  • (a) an excitation coil for inducing eddy currents within the electrically conductive material, the excitation coil having windings wherein the excitation coil'"'"'s longitudinal axis is perpendicular to the surface of the electrically conductive material;

    (b) a pick-up coil having an outer edge and having windings which are surrounded by the windings of the excitation coil; and

    (c) a tubular flux focusing lens disposed between the excitation coil and the pick-up coil, composed of a conductive material having a high magnetic permeability, having a first opening opposite the surface of the electrically conductive material and having a second opening adjacent to the surface of the electrically conductive material and which prevents magnetic coupling between the excitation coil and the pick-up coil when said probe is placed above an unflawed electrically conductive material and which produces high flux density at the outer edge of the pick-up coil.

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