A cylindrical guarded capacitor for spectral permittivity measurements of hard rock samples in the MHz-range
A cylindrical guarded capacitor for spectral permittivity measurements of hard rock samples in the MHz-range
复制标题
圆柱形保护电容器,用于 MHz 范围内硬岩样品的光谱介电常数测量
DOI:
10.1088/0957-0233/26/10/105902
复制
发表时间:
2015
影响因子:
2.4
通讯作者:
Wagner
中科院分区:
文献类型:
--
作者:
Schmidt;Wilting;Wagner
A shielded and guarded capacitor for non-destructive measurement of the complex permittivity of cylindrical rock samples has been developed. In combination with a vector network analyzer, the measurement system allows for rapid determination of spectral permittivity. The geometrical construction of the capacitor allows for scanning the properties of cylindrical samples, such as drill cores, and determination of anisotropy. The complex permittivity is calculated from the scattering parameters, which are determined using a network analyzer. The calculation is based on a π-network model for the cell and takes stray capacitances and capacitances related to the guard electrode into account. Using this method, good measurement accuracy is achieved between 10 MHz and 200 MHz. The validity of this method was proven by finite element modeling of the field distributions in the cell based on 3D electromagnetic simulation. The influence of typical geometrical imperfections of drill cores, such as varying diameter, finite length and heterogeneities has been studied and quantified by extensive measurements of test samples. These tests confirmed that due to the short shielded electrode, spatial variations in permittivity can be resolved on a sub-centimeter scale.
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DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
G. Picardi;D. Biccari;A. Cicchetti;R. Seu;J. Plaut;William T. K. Johnson;R. Jordan;D. Gurnett;R. Orosei;E. Zampolini
通讯作者:
E. Zampolini
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
N. Wagner;E. Trinks;K. Kupfer
通讯作者:
K. Kupfer
DOI:
--
发表时间:
1995
期刊:
影响因子:
--
作者:
R. Pelster
通讯作者:
R. Pelster
影响因子:
4.1
作者:
Bohleber;Wagner
通讯作者:
Wagner
DOI:
--
发表时间:
1997
期刊:
影响因子:
--
作者:
F. Cook;K. Vasudevan
通讯作者:
K. Vasudevan