Non-contact metallic inspection by using electromagnetic transfer function

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Metallic tubes used in factories and industrial plans may be deformed as a results of long term use and other natural causes. In this research, a new non-destructive inspection method by using electromagnetic wave transfer functions is developed. In the new method, metallic tubes are regarded as a circular waveguide, and deformation on the tubes can be detected by electromagnetic wave propagation inside the tube. Measuring the transfer functions (S parameter S11) through the tubes, deformations inside the tubes can be detected by changing the transfer functions.To verify this method, numerical and actual experiments were performed. As the results of them, small metallic piece (size: 5mmx2mm) placed inside the tube can be detected. This new detection method can be applied to complex shape tube with many bends, e.g. heat exchanger. New non-destructive inspection for metallic tubes is achieved by the results of this research.