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Method and apparatus for estimating the condition of a coating on an underground pipeline

  • US 20100117622A1
  • Filed: 11/10/2008
  • Published: 05/13/2010
  • Est. Priority Date: 11/10/2008
  • Status: Active Grant
First Claim
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1. A method for estimating a condition of a coating on a pipeline buried in soil using a magnetometer, comprising:

  • conducting a magnetically-detected electrochemical impedance spectroscopy (MEIS) test over a plurality of locations along one or more segments of the buried pipeline; and

    compensating for undesirable interfering and/or stray current signals flowing through at least one of the plurality of locations along a segment of the pipeline by providing at least one sinusoidal signal having a predominant amplitude and frequency to an output signal from the magnetometer.

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