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    High-Accuracy Conductivity Measurements in Nonferrous Metals

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    An eddy-current instrument has been built that measures electrical conductivity with a high degree of accuracy and precision. The instrument measures the electrical conductivity of nonferrous metals at a constant skin depth. By keeping the product ωσ constant in all measurements, a linear relationship between conductivity and frequency can be established. Due to this linear relationship, only one conductivity standard is necessary to calibrate the instrument over the full range of 1 to 100 percent international annealed copper standard (IACS).


    electrical conductivity, nonferrous metals, skin depth, coil impedance, percent international annealed copper standard, nondestructive evaluation

    Author Information:

    Free, G
    Research physicist, National Bureau of Standards, Department of Commerce, Washington, D.C.,

    Committee/Subcommittee: E07.07

    DOI: 10.1520/STP27582S