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Pipeline inspection using variable-diameter remote-field eddy current technology

  • US 7,683,611 B2
  • Filed: 06/22/2007
  • Issued: 03/23/2010
  • Est. Priority Date: 06/23/2006
  • Status: Active Grant
First Claim
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1. A pipeline inspection device for a pipe comprising:

  • an exciter coil capable of providing an alternating current magnetic field and producing eddy currents;

    a plurality of sensors capable of sensing a magnetic field produced by said eddy currents, said plurality of sensors engaged with a sensor shoe;

    said sensor shoe connected to a sensor support arm wherein said support arm is pivotably attached to a fixed hub and to a control arm;

    a driven hub pivotably attached to said control arm; and

    a lead screw, said lead screw engaged to and capable of positioning said driven hub along an axial axis of said pipeline inspection device;

    said sensors capable of being positioned at a first distance D1 with respect to an inner pipe wall surface and capable of providing coupling to said magnetic field produced by said eddy currents;

    said sensor shoe capable of retracting to a second distance D2, wherein D1<

    D2.

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