Electromagnetic analysis of concrete tensioning wires

  • US 6,791,318 B2
  • Filed: 01/07/2003
  • Issued: 09/14/2004
  • Est. Priority Date: 01/29/2001
  • Status: Active Grant
First Claim
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1. An inspection apparatus for detecting discontinuities in tensioning wires of a concrete pipe, comprising:

  • (i) driver means to induce a current in a metallic pre-stressing reinforcement of a concrete pipe;

    (ii) detector means to produce an output responsive to magnetic flux, the detector means spacedly disposed from said driver means and adapted to be disposed proximal to a surface of the pipe and not displaced axially along the pipe from said driver means more than one pipe diameter from a plane orthogonal to the axis of the pipe and common to said driver means;

    (iii) displacement sensor means to output the distance of the inspection apparatus from a known location;

    (iv) means for causing the inspection apparatus to move along the concrete pipe; and

    (v) means for storing outputs corresponding to detector means and the displacement sensor means.

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