微扰法测量干燥岩矿样品复介电常数

郑永春; 欧阳自远; 王世杰; 李春来; 冯俊明

微扰法测量干燥岩矿样品复介电常数

1.
中国科学院国家天文台，北京 100012
2.
中国科学院地球化学研究所，贵州贵阳 550002

基金项目:

中国科学院知识创新工程方向性项目 KGCX3-SYW-409

国家自然科学基金项目 40473036

详细信息

作者简介:
郑永春(1977-)，男，博士，从事天体化学与比较行星学研究.E-mail：zyc@bao.ac.cn

中图分类号: P631.3;P584
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出版历程
- 收稿日期: 2006-03-09
- 刊出日期: 2006-11-25

Measurement of Complex Permittivity of Dry Rocks and Minerals with Perturbation Method at 9 370 MHz

1.
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
2.
Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China

摘要

摘要: 微扰法是测量微波频率下介质材料复介电常数的简单易行的方法, 尤其对低ε′和低tanδ介质的测量很灵敏, 至今仍在广泛应用.但大部分岩矿样品的ε′和tanδ超出了微扰法的量程范围, 无法用该方法直接测量.本文提出了基于微扰法测量干燥岩矿样品复介电常数的新方法.先将干燥岩矿研磨成粉, 并与ε′和tanδ较小且介电性质稳定的聚乙烯粉末以一定体积百分比混合, 热压成型制样; 用微扰法测量岩塑混合物的复介电常数.两相混合体系的介电性质与其中每相的关系可以用Lichtenecker混合公式描述, 由于聚乙烯的复介电常数已知, 因此, 岩矿样品的复介电常数可由岩塑混合物的复介电常数计算得到.测量结果表明, 9370MHz时, 同一试样用矩形谐振腔微扰法、圆形谐振腔微扰法和传输反射法的测量结果一致, 并提供了部分干燥岩石和矿物的复介电常数测量数据.
- 微扰法 /
- 稀释法 /
- Lichtenecker公式 /
- 复介电常数 /
- 岩石和矿物
Abstract: Resonant cavity perturbation method, widely used as an easy and fast method for determining dielectric properties of materials at microwave frequencies, is very sensitive to the measurement of the materials with low ε′ and tanδ values. However, it is not suitable to measure a majority of rocks and minerals whose ε′ and tanδ values are beyond the measurement range using the perturbation method. This paper proposes the polythene dilution method, a new perturbation-based method, to measure complex dielectric permittivity of dry rocks and minerals over 9 370 MHz. At first, the dry rocks and minerals are ground into powder, and then they are mixed in a given proportion with polythene powder, both with relatively low ε′ and tanδ and with stable dielectric property, and then hot-pressed into fine granular specimens. The perturbation method is used to measure the complex dielectric permittivity of the rock and plastic mixture. The dielectric property of the two-phase mixed system and its relation to either of the two phases can be obtained with Lichtenecker mixture formulae. Since the complex dielectric permittivity of the polythene is known, the complex dielectric permittivity of the rock samples can be calculated from that of the rock and mineral samples. At 9 370 MHz, as shown by the measurement results, the measurement of the same testing sample produced the same result with either of the perturbation method of rectangular or round resonant cavities, or of the transmission reflectometry, and provided us with the complex dielectric permittivity data measured from part of the dry rocks and minerals.
- resonant cavity perturbation method /
- polythene dilution method /
- Lichtenecker's mixture formulae /
- complex dielectric permittivity /
- rocks and minerals

HTML全文

表 1 9 370 MHz微扰法对标准物质复介电常数测量结果及其与标称值的比较

Table 1. Comparison between complex dielectric permittivity and loss tangent of six standard materials measured by cavity perturbation method and its criterion values at 9 370 MHz

表 2 9 370 MHz谐振腔微扰法和传输/反射法对部分岩矿样品及聚乙烯复介电常数测量结果

Table 2. Complex dielectric permittivity of some rocks, minerals and polythlene measured by cavity perturbation method and transmission reflection method at 9 370 MHz respectively

表 3 聚乙烯稀释法间接测量与杆状岩矿试样直接测量的复介电常数比较

Table 3. Complex dielectric permittivity of some rocks and minerals measured by polythene dilution method indirectly and using rocks and minerals specimen directly

表 4 部分岩矿样品的复介电常数

Table 4. Complex dielectric permittivity of some rocks and minerals

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