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Method and apparatus for a multi-channel multi-frequency data acquisition system for nondestructive eddy current inspection testing

  • US 5,182,513 A
  • Filed: 04/06/1991
  • Issued: 01/26/1993
  • Est. Priority Date: 04/06/1991
  • Status: Expired due to Term
First Claim
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1. An eddy current inspection apparatus for detecting flaws in a conductive surface comprising:

  • a plurality of spatially correlated eddy current probe means;

    means for driving select probe means of the plurality with a plurality of select frequencies;

    means for automatically scanning in a vicinity of the surface to synchronously acquire discrete scan responsive measurement signals from each of the plurality of probe means;

    means for responsively multiplexing each measurement signal onto a predetermined number of independent data channels in order to collect a corresponding plurality of measurement signals for parallel processing;

    means for demodulating each measurement signal of the plurality against a reference frequency in order to obtain a corresponding pair of basis components for image processing;

    means for converting each component pair into digital format;

    automated means for storing the digitized components; and

    means for automated parallel image processing of the digital components.

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