Abstract
Near-field scanning microwave microscopy using a coaxial probe has been theoretically and experimentally investigated in order to image differences in the electrical conductivity of metal samples. Experiments performed at 17.5 GHz <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\boldsymbol{(\lambda=17.1\ \text{mm})}$</tex> show that the graphite structure of ductile cast iron, whose characteristic dimension was of the order of tens of microns, can be successfully imaged. This result suggests that near-field scanning microwave microscopy technique proposed herein can provide a useful means of classifying the graphite structure in cast iron, which affects the mechanical properties of the metal.
Published Version
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