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首页> 外文期刊>International Journal of Microwave and Wireless Technologies >A time domain transmission measurement system for dielectric characterizations
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A time domain transmission measurement system for dielectric characterizations

机译：用于介电特性的时域传输测量系统

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摘要

Delay time measurements are a commonly used technique for the characterization of dielectric materials. Especially with regard to the characterization of water-solid mixtures like soil or grain delay time measurements, e.g., time domain reflec-tometry offers a powerful method. However, the accuracy of reflection measurements is limited due to multiple reflections caused by inhomogenities of the environmental material of the sensor. This contribution deals with an improved sensor design based on time domain transmission (TDT) measurements. Thus, the first received impulse includes the necessary information. Multiple reflections are received at later time steps and their influence on the measurement accuracy is nearly negligible. To improve the performance and the applicability of the designed sensor, a cost-efficient TDT system is designed, which is integrated in the sensor. Additionally, a so-called "concentric reversion coupler" is used, which offers the possibility to perform TDT measurements without the necessity of external measuring ports.
机译：延迟时间测量是介电材料表征的常用技术。尤其是在表征水固混合物（例如土壤或谷物延迟时间）方面，例如时域折光法提供了一种有效的方法。然而，由于传感器的环境材料的不均匀性引起的多次反射，反射测量的精度受到限制。该贡献涉及基于时域传输（TDT）测量的改进的传感器设计。因此，第一接收到的冲动包括必要的信息。在以后的时间步长会收到多次反射，它们对测量精度的影响几乎可以忽略不计。为了提高所设计传感器的性能和适用性，设计了一种经济高效的TDT系统，该系统集成在传感器中。另外，使用了所谓的“同心反向耦合器”，从而无需外部测量端口即可执行TDT测量。

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