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首页> 外文期刊>Science, Measurement & Technology, IET >Broadband, non-destructive characterisation of PEC-backed materials using a dual-ridged-waveguide probe
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Broadband, non-destructive characterisation of PEC-backed materials using a dual-ridged-waveguide probe

机译：使用双脊波导探头对PEC支持的材料进行宽带无损表征

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摘要

A new probe which utilises a dual-ridged waveguide to provide broadband, non-destructive (ND) material characterisation measurements of a perfect electric conductor (PEC)-backed material is introduced. The new probe possesses a bandwidth similar to existing coaxial probes and is structurally robust like rectangular waveguide probes. The combinations of these two qualities make it especially attractive for ND inspection/evaluation applications in the field. The theoretical development of the dual-ridged-waveguide probe is discussed. A magnetic field integral equation is derived by applying Love's equivalence theorem and enforcing the continuity of transverse fields at the dual-ridged-waveguide aperture. The magnetic field integral equation is then solved for the theoretical reflection coefficient using the method of moments. The permittivity and permeability of the material under test are found by minimising the root-mean-square difference between the theoretical and measured reflection coefficients using non-linear least squares. To validate the new probe, experimental results are presented of a magnetic absorbing material comparing results obtained using the new probe with those obtained using a traditional, destructive technique. The probe's sensitivity to sample thickness, flange-plate thickness, cutoff wavenumber and measured S-parameter uncertainties is also investigated.
机译：引入了一种新探针，该探针利用双脊波导提供了对完美电导体（PEC）支持的材料的宽带，无损（ND）材料表征测量。新探头具有与现有同轴探头相似的带宽，并且在结构上像矩形波导探头一样坚固。这两种品质的结合使其在现场ND检查/评估应用中特别有吸引力。讨论了双脊波导探头的理论发展。通过应用Love等价定理并加强双脊波导孔径处横向场的连续性，可以得出磁场积分方程。然后使用矩量法求解磁场积分方程的理论反射系数。通过使用非线性最小二乘法最小化理论反射系数和测量反射系数之间的均方根差，可以找到被测材料的介电常数和磁导率。为了验证该新探针，提供了一种磁吸收材料的实验结果，将使用新探针获得的结果与使用传统破坏性技术获得的结果进行了比较。还研究了探头对样品厚度，法兰板厚度，截止波数和测得的S参数不确定性的敏感性。

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