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access icon free Fast circuit model for interaction of open-ended rectangular waveguide probes with arbitrary-shape surface cracks in metals

© The Institution of Engineering and Technology
Received 01/04/2014, Accepted 22/08/2014, Revised 10/07/2014, Published 14/04/2015

The study proposes a fast modelling technique to predict output signal of an open-ended rectangular waveguide when scanning an arbitrary-shape surface crack in a metal. In this technique, the crack is first segmented into an appropriate number of short rectangular waveguides each of which is modelled by a two-port network with an equivalent RLC circuit. The generalised scattering matrix technique is then used to predict the probe output signal. The efficiency of the proposed model is demonstrated by comparing the simulation results of several case studies with measurements and those obtained using the mode-matching method and a commercial finite integration technique code.

Inspec keywords: metals; two-port networks; equivalent circuits; rectangular waveguides; surface cracks; S-matrix theory; circuit simulation; crack detection; RLC circuits

Other keywords: finite integration technique code; generalised scattering matrix technique; equivalent RLC circuit; metals; two-port network; open-ended rectangular waveguide probes; mode-matching method; arbitrary-shape surface cracks; fast circuit model

Subjects: Computer-aided circuit analysis and design; Materials testing; Waveguides and microwave transmission lines; Algebra; Filters and other networks

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