Passive Wireless UHF RFID Antenna Label for Sensing Dielectric Properties of Aqueous and Organic Liquids
Passive Wireless UHF RFID Antenna Label for Sensing Dielectric Properties of Aqueous and Organic Liquids
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DOI：
10.1109/jsen.2019.2896481
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发表时间：
2019-06
影响因子：
4.3
通讯作者：
Viktorija Makarovaite;Aaron J. R. Hillier;S. Holder;Campbell W. Gourlay;J. Batchelor
中科院分区：
文献类型：
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作者：
Viktorija Makarovaite;Aaron J. R. Hillier;S. Holder;Campbell W. Gourlay;J. Batchelor
提出了具有较宽相对介电常数范围的有机水溶液介电性质的原位无线传感。建议使用附着在透明硼硅酸盐玻璃瓶或培养皿上的超高频无源标签天线设计，这允许对液体溶液进行不显眼的安全监测。曲折偶极天线（具有寄生环路匹配组件）频率高度依赖于所选择的容器以及存在于其中的液体，并且随着偏移的介电性质而调整。高相对介电常数（如水）的测试解决方案沿着与低介电常数，有损耗的液体（如二甲苯）提出了独特的频率特性与读取距离高达7米的每种类型的容器测试。该传感器还能够检测“未知”溶液，并通过利用标准曲线分析确定介电特性，其相对介电常数的准确度为±0.834，电导率为$\pm 0.050\，\，\text {S}\cdot \text {m}^{-{1}}$（与市场上的标准介电测量系统相比）。在已知精度的情况下，调整设计以适应任何必要的频率是可能的，作为检测任何一个液体系统中的特定变化的手段。该传感器是用于液体存储容器的离散实时监测的可能候选者，并且是用于低成本散装液体介电特性识别的替代方案，其可以根据需要在需要恒定或远程监测的区域中实施。
The in situ wireless sensing of dielectric properties for organic aqueous solutions with a wide range of relative permittivities is presented. The use of an ultra-high frequency passive label antenna design attached to either clear borosilicate glass bottle or Petri plate is proposed, which allows for the unobtrusive, safe monitoring of the liquid solutions. The meandered dipole antenna (with a parasitic loop matching component) frequency is highly reliant on the chosen container as well as on the liquid present within, and adjusts with shifting dielectric properties. Tested solutions of high-relative permittivity (such as water) along with low permittivity, lossy liquids (such as xylene) presented distinctive frequency characteristics with read distances of up to 7 m for each type of container tested. The sensor was also able to detect ‘unknown’ solutions and determine the dielectric properties by utilizing standard curve analysis with an accuracy of ±0.834 relative permittivity and $\pm 0.050\,\,\text {S}\cdot \text {m}^{-{1}}$ conductivity (compared to a standard dielectric measurement system available on the market). With the accuracy known, tuning the design to fit any necessary frequency is possible as a means to detect specific changes in any one liquid system. This sensor is a possible candidate for discreet real-time monitoring of liquid storage containers and an alternative for low-cost bulk liquid dielectric property identification, which could be implemented in areas requiring, constant, or remote monitoring as needed.