Output signal prediction of an open-ended rectangular waveguide probe when scanning cracks at a non-zero lift-off |
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Authors: | AM Yadegari R Moini SHH Sadeghi F Mazlumi |
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Affiliation: | 1. Iran Telecommunication Research Center, End of North Kargar St., Tehran 14399, Iran;2. Department of Electrical Engineering, Amirkabir University of Technology, Tehran 15914, Iran;3. Civil Aviation Technology College, Meraj Ave., Tehran 13878, Iran |
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Abstract: | The paper proposes a modeling technique for output signal prediction of a rectangular waveguide probe with finite flange when scanning a surface long crack in a metal at a finite lift-off. The modeling technique approximates the crack–probe interaction with a two-dimensional problem. In this problem, a parallel-plate waveguide with finite flange scans a long crack in a perfect conductor. The method of moments is employed to solve the governing electric field integral equation. The solution provides the reflection coefficient in the parallel-plate waveguide from which the probe output signal is obtained. The main feature of the model is solving the three-dimensional problem in a two-dimensional frame work, thus reducing the degree of complexity and computation time. To validate the accuracy of the model, several simulation results are presented at an operating frequency in the X-band and are compared with their experimental counterparts. To demonstrate the efficiency of the model, we compare our results with those obtained using the well-known HP-HFSS finite element code. It is shown that the proposed model requires less than half of the time taken to solve the same problem running on the same computer. |
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