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Super sensitive eddy-current electromagnetic probe system and method for inspecting anomalies in conducting plates

  • US 6,636,037 B1
  • Filed: 03/31/2000
  • Issued: 10/21/2003
  • Est. Priority Date: 03/31/2000
  • Status: Expired due to Term
First Claim
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1. A method of transducing magnetic signals indicative of a flaw in a conducting object, comprising:

  • shielding an excitation coil on substantially all sides except an emission face;

    transmitting an alternating magnetic signal to the conducting object from the shielded excitation coil, such that the alternating magnetic signal is modified by the conducting object;

    shielding a magnetic detector within a probe on substantially all sides except a reception face;

    receiving the alternating magnetic signal as modified by the conducting object into the shielded magnetic detector;

    converting the received alternating magnetic signal into a first electrical signal within the shielded magnetic detector;

    shielding a signal-conditioning circuit within the probe on substantially all sides;

    providing electrical power to the shielded signal-conditioning circuit within the probe;

    amplifying the first electrical signal with the signal-conditioning circuit to create a second electrical signal; and

    analyzing phase and amplitude components of the second electrical signal to provide an indication of the flaw.

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