Effective frequency and attenuation measurements of glass beads/magnetite mixtures by time-domain reflectometry

Effective frequency and attenuation measurements of glass beads/magnetite mixtures by time-domain reflectometry
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通过时域反射计测量玻璃珠/磁铁矿混合物的有效频率和衰减

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发表时间：
2007
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通讯作者：
G. Vannaroni
G. Vannaroni
中科院分区：
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文献类型：
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作者：
E. Mattei;A. D. Santis;E. Pettinelli;G. Vannaroni

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具有不同百分比（5-30%）的磁铁矿和不同粒度范围的样品， 通过时域反射仪（TDR）分析。通带、衰减因子α和 有效频率是从TDR测量中得出的。通带由 通过消除DC分量并应用傅立叶变换来测量样本的第二边缘， 残留信号。所得光谱形状的带宽随着磁铁矿百分比的增加而减小。 增大第二边缘也用于评估有效衰减因子α e， 使用多次反射理论，终止于第二次反射。衰减值α可以 通过使用LCR获得的电磁参数独立估计 米为了比较α和α e，引入有效TDR频率ν e。之间的协议 从时域反射仪和LCR测量仪技术获得的数值支持了衰减的可靠性 从第二TDR反射导出，并且从有效频率计算。的 磁铁矿/玻璃珠混合物的通带形状以及α e和ν e值， 干土壤与增加氧化铁含量，报告和讨论。
Samples with different percentages (5–30%) of magnetite and different ranges of grain size are analysed by time-domain reflectometry (TDR). The passband, the attenuation factor α and the effective frequency are derived from the TDR measurements. The passband was obtained from the second edge of the sample by eliminating the DC component and applying a Fourier transform to the residual signal. The bandwidth of the resulting spectral shape decreases as the magnetite percentage increases. The second edge was also used to evaluate the effective attenuation factor α e , using multiple-reflection theory, terminated at the second reflection. The attenuation values α can be estimated independently by means of the electromagnetic parameters obtained using an LCR meter. To compare α and α e , an effective TDR frequency ν e is introduced. The agreement between the values obtained from TDR and LCR-meter techniques supports the reliability of the attenuation derived from the second TDR reflection, and that computed from the effective frequency. The shapes of the passbands and the α e and ν e values for magnetite/glass-beads mixtures, which simulate dry soils with increasing iron oxides content, are reported and discussed.