Laboratory investigations into the electromagnetic properties of magnetite/silica mixtures as Martian soil simulants
Laboratory investigations into the electromagnetic properties of magnetite/silica mixtures as Martian soil simulants
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作为火星土壤模拟物的磁铁矿/二氧化硅混合物的电磁特性的实验室研究
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
F. Bella
中科院分区：
文献类型：
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作者：
E. Pettinelli;G. Vannaroni;A. Cereti;A. R. Pisani;F. Paolucci;D. D. Vento;D. Dolfi;S. Riccioli;F. Bella
本文给出了一组模拟火星土壤的磁铁矿/二氧化硅混合物的电、磁参数频域（500 Hz ~ 1 MHz）实验数据。复介电常数是通过测量充满被测材料的电容电池的电阻抗的幅值和相位得到的。通过测量完全嵌入混合物中的环形体的阻抗，得到了复合磁导率。介电常数和磁导率均随磁铁矿体积分数的增加而明显增加，并与晶粒尺寸和来源有关。此外，为了评估将1 MHz采集的数据扩展到更高频率（数十至数百MHz）的可能性，将这些数据与时域反射测量进行了一些比较。最后，计算了不同类型的磁铁矿/二氧化硅混合物的衰减随磁铁矿体积分数和频率的变化（与MARSIS和SHARAD探测仪的波段一致）。结果表明，在含有大量磁性物质的干燥土壤中，波速和衰减是磁性物质的尺寸、形状和来源等多种因素的综合。
[1] In this paper a set of frequency domain (500 Hz to 1 MHz) experimental data on electrical and magnetic parameters of magnetite/silica mixtures as Martian soil simulants is presented. Complex permittivity was obtained by measuring the magnitude and phase of the electrical impedance of a capacitive cell filled with the tested material. Complex magnetic permeability was obtained by measuring the impedance of a toroid fully embedded in the mixtures. Both the permittivity and magnetic permeability exhibited an appreciable increase with the magnetite volume fraction and a complex behavior with grain size and origin. Furthermore, to assess the possibility of extending the data acquired at 1 MHz to higher frequencies (tens to hundreds of MHz), some comparisons were made between these data and Time Domain Reflectometry measurements. Finally, the attenuation versus magnetite volume fraction and frequency (in a band consistent with the MARSIS and SHARAD sounders) was computed for various types of magnetite/silica mixtures. The results indicate that in a dry soil which contains a significant fraction of magnetic material both the wave velocity and the attenuation are a combination of different factors, including the dimension, shape, and origin of the magnetic material.