基于电磁方法的混合物介电特性研究及含水量检测

发布时间：2018-05-15 17:02

本文选题：混合物 + 介电常数　；参考：《长安大学》2015年硕士论文

【摘要】：混合物介电特性是研究其物理学特征、测定其成分的基础,对环境污染监测、建筑物稳定性及道路性能评估等领域意义重大。但受到理论方法、研究手段等因素限制,对土壤、岩石等混合介质电学特性的计算和测量问题至今未能形成一套完整成熟的理论体系和有效的研究方法。土壤的含水量测量问题在地质学、土壤学研究等领域也都具有重要应用意义,但目前用于测量土壤含水量参数的各种方法在精度、适用性、环保等方面尚有局限性。本研究工作利用超宽带电磁窄脉冲技术来研究岩石、土壤等混合介质的介电常数特性,并将此方法应用于测量土壤含水量参数。这种超宽带电磁脉冲测量方法利用超宽带电磁脉冲信号来获得介质的时域介电响应以及在超宽频谱内的连续介电响应曲线,阐明土壤介电特性在连续谱内的变化特性,及其与样本成分、结构、饱和度、温度等因素之间的动态关系。通过对时、频域介电响应的联合反演分析获得准确度较高的含水量参数。并采用数值模拟与实验测量相结合的方法来验证此测量方法的有效性及可行性。设计并实现超宽带脉冲收发天线系统,开展土壤介电模型在复杂因素影响下对纳秒级脉冲信号的介电响应实验研究,建立及完善超宽带介电反演算法以计算土壤含水含盐量等物理参数。本项目对于深入了解物质介电特性及含水量等参数对超宽带电磁脉冲的响应规律,发展新型的含水量测量方法,具有重要的科学意义和应用价值,其研究成果可推广于土壤或路基含水量测量等工程应用。
[Abstract]:The dielectric properties of mixtures are the basis for studying their physical characteristics and determining their components. They are of great significance in the field of environmental pollution monitoring, building stability and road performance evaluation. However, due to the limitations of theoretical methods and research methods, the calculation and measurement of electrical properties of mixed media such as soil and rock have not yet formed a complete and mature theoretical system and effective research methods. The measurement of soil water content is also of great significance in the fields of geology and soil science, but there are still some limitations in the precision, applicability and environmental protection of various methods used to measure soil water content parameters at present. In this study, the dielectric constant of rock, soil and other mixed media was studied by using ultra-wideband electromagnetic narrow pulse technique, and the method was applied to measure soil water content parameters. The UWB electromagnetic pulse measurement method uses UWB electromagnetic pulse signal to obtain the dielectric response in time domain and the continuous dielectric response curve in the ultra wide spectrum. The variation characteristics of soil dielectric characteristics in the continuous spectrum are clarified. And its dynamic relationship with sample composition, structure, saturation, temperature and other factors. The water content parameters with high accuracy are obtained by the joint inversion analysis of the dielectric response in the frequency domain. The method of numerical simulation and experimental measurement is used to verify the validity and feasibility of this method. An ultra-wideband pulse transceiver antenna system is designed and implemented. The dielectric response of soil dielectric model to nanosecond pulse signal is studied under the influence of complex factors. To establish and perfect the ultra-wideband dielectric inversion algorithm to calculate the soil water and salt content and other physical parameters. This project has important scientific significance and application value for deeply understanding the response law of material dielectric characteristics and water content and other parameters to UWB electromagnetic pulse, and developing a new measuring method of water content. The research results can be extended to soil or subgrade moisture measurement and other engineering applications.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S152

【共引文献】