Positionally-independent and Extended Read Range Resonant Sensors Applied to Deep Soil Moisture Monitoring
Positionally-independent and Extended Read Range Resonant Sensors Applied to Deep Soil Moisture Monitoring
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DOI：
10.1016/j.sna.2021.113227
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发表时间：
2021-11
期刊：
影响因子：
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通讯作者：
Yee Jher Chan;Adam R. Carr;Subhanwit Roy;Caden M. Washburn;N. Neihart;N. Reuel
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文献类型：
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作者：
Yee Jher Chan;Adam R. Carr;Subhanwit Roy;Caden M. Washburn;N. Neihart;N. Reuel
在这里，我们详细介绍了电感耦合扩展器（ICE）和谐振（LC）传感器监测土壤水分使用便携式阅读器。这种ICE-LC设计的显著进步是将典型的LC传感器读取范围扩展到仪表上，并降低读取器和传感器之间的位置对准灵敏度。分析模型验证了ICE-LC系统的工作原理和可行性。ICE-LC传感器的原型在灵敏度和功率传输方面进行了构建和优化（ICE顶部和底部线圈分别为单匝和四匝）。土壤湿度测试验证了ICE-LC在最小化位置对准灵敏度和扩展读取范围方面的改进，随着土壤湿度的增加，谐振频率降低。当用现有的有线方法校准时，ICE-LC传感器具有4.52%水分含量/MHz的可再现线性传感器增益，R2为0.745，RMSE为2.41%。还测试了ICE-LC传感器的更小的平面形状因子，并且在更短的读取范围内显示出读取器和传感器之间的降低的位置对准灵敏度。这项初步研究表明，ICE-LC谐振传感器作为一种具有成本效益的方法，在许多领域的位置，在整个生长季节监测土壤水分含量的可行性。
Here we detail an inductively coupled extender (ICE) and resonant (LC) sensor to monitor soil moisture using a portable reader. Significant advances of this ICE-LC design are extending typical LC sensor read range over a meter and reducing positional alignment sensitivity between reader and sensor. An analytical model validates the working principle and feasibility of the ICE-LC system. Prototypes of the ICE-LC sensor were built and optimized in terms of sensitivity and power transfer (single and four turns for ICE top and bottom coils, respectively). Soil moisture tests validated the ICE-LC improvements on minimized positional alignment sensitivity and extended read range, transducing a decrease in resonant frequency with increasing soil moisture. When calibrating with existing wired approaches, the ICE-LC sensor had a reproducible, linear sensor gain of 4.52%moisture content/MHz with an R2of 0.745 and RMSE of 2.41%. A smaller, planar form factor of the ICE-LC sensor was also tested and exhibited reduced positional alignment sensitivity between reader and sensor at shorter read ranges. This initial study demonstrates the feasibility of the ICE-LC resonant sensor as a cost-effective method to monitor soil moisture content throughout the growing season at many field locations.