Interaction between water and lubrication grease oil is not desirable, but it is not inevitable. The operational life of the machine component is influenced by humid grease oil. Metameterial-based transmission line sensor application is proposed and its operation is validated both numerically and experimentally by inserting grease oil samples in the sample holder. The proposed sensor structure is able to determine the humidity ratio of grease oil samples. The proposed structure shifts resonance frequency to react to the grease oil’s dielectric constant. The frequency shift of grease oil samples is monitored as about 300 MHz’s. Linearity characteristic between resonant frequency and dielectric constant value is validated. The novelty of this article is that no such study has been conducted by employing non-destructive methods which provide long-term stability of the sensor structure.

中文翻译：

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使用超材料润滑油脂湿度传感器

水和润滑脂油之间的相互作用是不可取的，但并非不可避免。机器部件的使用寿命受潮湿油脂油的影响。提出了基于元材料的传输线传感器应用，并通过在样品架中插入油脂样品在数值和实验上验证了其操作。所提出的传感器结构能够确定油脂样品的湿度比。提议的结构改变共振频率以对油脂的介电常数作出反应。油脂样品的频移被监测为大约 300 MHz。验证了谐振频率和介电常数值之间的线性特性。