Strongly perturbed cavity resonators as tools for non-destructive in-situ material parameter measurement

强扰动空腔谐振器作为无损原位材料参数测量的工具

• 批准号: 389867475
• 负责人: Professor Dr.-Ing. Gerhard Fischerauer
• 金额: --
• 依托单位: Lehrstuhl für Mess- und Regeltechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/389867475?language=en
• 关键词: Strongly; perturbed; cavity; resonators; tools

According to the state of the art, electric material parameters at GHz frequencies are measured by, amongst others, the cavity perturbation method. In doing so, one compares the measurable resonator characteristics with and without material sample in the cavity and assumes but a small perturbation by the sample and the required coupling of the resonator to the measuring environement. If one could monitor, for instance, loose materials, fluids, and catalysts in their process environments, many processes could be run more efficiently energy-wise, more environmentally friendly, and more economically. With these potential applications, several assumptions of the cavity perturbation method are violated. In particular, one cannot freely design geometries and select materials inprocess installations. One rather faces large, inhomogeneous, lossy, anisotropic, and time-varying fillings and (depending on the resonance mode and the material parameters) a strong coupling to the measuring environment. In theses cases, the resonator is stronglyperturbed. Even in simple cases (homogeneous, but quite lossy resonator filling), there is currently no feasible way of extracting the characterisctis of the uncoupled resonator, which are of interest because they mirror the properties of the material sample, from the measurable characteristics of the coupled resonator. The current project aims at laying the foundations for the measurement of electrical material parameters by the cavity perturbation method in those instances in which the usual assumptions are violated. To this end, it is vital to eliminate the effect of the coupling on the resonance characteristics.

根据现有技术，在GHz频率下的电材料参数尤其通过腔微扰法来测量。在这样做时，比较在腔中具有和不具有材料样品的情况下的可测量的谐振器特性，并且仅假设样品的小扰动以及谐振器与测量元件的所需耦合。例如，如果人们可以监测其工艺环境中的松散材料、流体和催化剂，许多工艺可以更有效地节能、更环保和更经济地运行。这些潜在的应用，违反了腔微扰法的几个假设。特别是，人们不能自由地设计几何形状和选择材料的过程中安装。一个是面对大的，不均匀的，有损耗的，各向异性的，和随时间变化的填充物和（取决于谐振模式和材料参数）的测量环境的强耦合。在这些情况下，谐振器受到强烈扰动。即使在简单的情况下（均匀的，但相当有损的谐振器填充），目前还没有可行的方法来提取未耦合谐振器的特性，这是感兴趣的，因为它们反映了材料样品的性质，从耦合谐振器的可测量的特性。目前的项目旨在奠定基础，在这些情况下，通常的假设是违反的电材料参数的测量的空腔微扰法。为此，消除耦合对谐振特性的影响至关重要。