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Apparatus and method for eddy current detection of subsurface discontinuities in conductive bodies

  • US 4,271,393 A
  • Filed: 12/29/1978
  • Issued: 06/02/1981
  • Est. Priority Date: 12/29/1978
  • Status: Expired due to Term
First Claim
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1. Eddy current inspection apparatus for detecting the presence of subsurface regions within a body wherein the region to be detected is of a different electrical conductivity than portions of said body that surround said region to be detected, said eddy current inspection apparatus comprising:

  • drive coil means positionable on the surface of said body to be inspected, said drive coil means being configured for inducing a magnetic field that is directed inwardly into an inspected region of said body in response to an applied drive signal;

    electrical signal supply means interconnected with said drive coil for supplying said drive signal, said electrical signal supplying means including means for supplying said drive signal as a current pulse having a relatively long rise time and a substantially shorter fall time; and

    magnetic flux detection means positionable on said surface of said body being inspected at a location proximate to said drive coil means, said magnetic flux detection means for supplying a signal representative of the eddy currents produced in said body by that portion of said drive current exhibiting said short fall time.

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