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Device for the non-destructive testing of an electrically conductive structure

  • US 9,000,781 B2
  • Filed: 04/08/2010
  • Issued: 04/07/2015
  • Est. Priority Date: 04/10/2009
  • Status: Active Grant
First Claim
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1. A device for non-destructive testing of an electrically conductive part comprising:

  • an induction portion;

    a receiving portion; and

    processing means;

    wherein the induction portion comprises an inductor dissociated into n elementary inductors of layer type supplied at different frequencies f1, f2, . . . , fn;

    wherein the receiving portion comprises n′

    magnetic receivers distributed over m columns, each column comprising at most n receivers, the magnetic receivers being connected to one another over each column, the m columns of receivers being supplied by electrical signals v1

    , v2

    , . . . , vm

    , of frequencies fi

    , f2

    , . . . , fm

    , zero or non-zero, each magnetic receiver being arranged under an elementary inductor, m magnetic receivers being positioned under each elementary inductor, the indices n, n′ and

    m being positive integers such that n>

    =2, 1<

    n′

    <

    =n*m and m>

    1,wherein the processing means comprises, for each column of receivers of row i with 1≦

    i≦

    m, means of measuring the signal at terminals of this column of receivers followed by means of demodulating this signal at the frequencies f1+f′

    i, f2+f′

    i - - - fn+f′

    i or f1

    f′

    i, f2

    f′

    i - - - fn−

    f′

    i and means of calculating the magnetic field in each of the receivers of this column, andwherein the magnetic receivers are directed according to an axis of sensitivity, a main direction of currents of these elementary receivers being directed according to a perpendicular axis.

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