| 基于开口同轴法的岩矿石样品介电常数测试 |
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| 引用本文： | 吴俊军,刘四新,董航,张丽丽,曾昭发,傅磊,王飞.基于开口同轴法的岩矿石样品介电常数测试[J].地球物理学报,2011,54(2):457-465. |
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| 作者姓名： | 吴俊军 刘四新 董航 张丽丽 曾昭发 傅磊 王飞 |
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| 作者单位： | 吉林大学地球探测科学与技术学院,长春 130026 |
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| 基金项目： | 国家"863"项目，国家自然科学基金项目，国家自然科学基金项目 |
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| 摘 要： | 火成岩及变质岩找矿是金属探矿的重要组成部分,围岩与矿体之间存在的电性差别是区分二者的重要标志;另外探地雷达以高频电磁波传播为基础,决定电磁波场波速的主要因素是介电常数,因此以介电常数及电导率为内容的电性参数测试就显得尤为必要.传统岩矿石介电常数测试主要使用同轴传输/反射法,而开口同轴法在岩矿石电性测试方面的工作开展较少...
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| 关 键 词： | 介电常数 开口同轴探头 准静态模型 火成岩 变质岩 岩矿石样品测试 |
| 收稿时间： | 2010-03-31 |
Permittivity measurement for rock and ore samples by open-ended coaxial method |
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| WU Jun-Jun,LIU Si-Xin,DONG Hang,ZHANG Li-Li,ZENG Zhao-Fa,FU Lei,WANG Fei.Permittivity measurement for rock and ore samples by open-ended coaxial method[J].Chinese Journal of Geophysics,2011,54(2):457-465. |
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| Authors: | WU Jun-Jun LIU Si-Xin DONG Hang ZHANG Li-Li ZENG Zhao-Fa FU Lei WANG Fei |
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| Institution: | College of Geo-exploration Science & Technology, Jilin University, Changchun 130026, China |
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| Abstract: | Complex permittivity is an important parameter for practical application of GPR and borehole radar. The enough distinction of EM parameters (such as permittivities) between target ores and surrounding rocks is the pre-condition of surface and borehole radar exploration. For permittivity measurement of ores and rocks, coaxial methods are commonly used. Open-ended coaxial probe technique is one of these methods. Compared with other techniques, this method is more convenient, faster and easier in sample preparation. The key issue of this technique is the closeness of probe contacting with medium. In this paper, we use quasi-static model to build the relationship of relative permittivity εr and reflection coefficient Γ, which is measured by a vector network analyzer (Agilent E5071B). We use three mediums (i.e. air firm, short circle, de-ionized water) for calibration. The complex permittivities are then determined by optimization algorithm. For contrast, the normal coaxial line method has very difficult sample manufacture. At last we use open-ended method to determine permitivities of several practical rock and metal-ore samples, and then display the permitivities of samples from some samples of igneous rocks and metamorphic rocks. From the analysis of data, we find this method is quite suitable for metal-ore testing. |
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| Keywords: | Permittivity Open-ended coaxial probe Quasi-static model Igneous rock Metamorphic rock Rock measurement |
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