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    Minimizing the Effect of Probe-to-Metal Spacing in Eddy Current Testing


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    In the nondestructive testing of metals by eddy current methods, a continuing problem has been the reduction of the effect of varying probe-to-sample spacing on the test results. In the testing of samples of circular crosssection by means of circular test coils, changes in coil-to-sample distance may be caused by diameter variations of the samples, while in the testing of plane samples such as a plate with a point type of probe, the variation in probe-to-sample spacing may be caused by irregularities of the surface of the sample or by vibrations of the probe or sample. This paper is concerned exclusively with the testing of plane samples. Production test situations require constant movement of the probe parallel to the surface of the sample, and it is preferred that no contact occur between the probe or probe holder and the metal sample.

    Author Information:

    Renken, C. J.
    Argonne National Laboratory, Lemont, Ill.

    Waidelich, D. L.
    Argonne National Laboratory, Lemont, Ill.

    Committee/Subcommittee: E07.07

    DOI: 10.1520/STP41992S