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Method and apparatus for examining a workpiece

  • US 4,644,271 A
  • Filed: 02/25/1985
  • Issued: 02/17/1987
  • Est. Priority Date: 02/25/1985
  • Status: Expired due to Fees
First Claim
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1. Apparatus for testing a metallic workpiece comprising:

  • a test coil mounted in proximity to a workpiece and coupled to means for cyclically energizing said coil;

    field modifying means comprising an electrically conductive sleeve defining at least one aperture for selectively modifying a magnetic field created by said coil;

    means coupled to said coil for creating a shape indicating signal related to a distance between an outer workpiece surface and said coil as said magnetic field is modified, andmeans coordinated with said field modifying means for scaling the shape signal to provide an indicating signal which varies with changes in workpiece shape.

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