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