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首页> 外文OA文献 >Development of impedance spectroscopy based in-situ, self-calibrating, on-board wireless sensor with inbuilt metamaterial inspired small antenna for constituent detection in multi-phase mixtures like soil
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Development of impedance spectroscopy based in-situ, self-calibrating, on-board wireless sensor with inbuilt metamaterial inspired small antenna for constituent detection in multi-phase mixtures like soil

机译：基于阻抗光谱的原位自校准车载无线传感器的开发，内置内置超材料激发的小型天线，可用于土壤等多相混合物中的成分检测

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Real time and accurate measurement of sub-surface soil moisture and nutrients is critical for agricultural and environmental studies. This work presents a novel on-board solution for a robust, accurate and self-calibrating soil moisture and nutrient sensor with inbuilt wireless transmission and reception capability that makes it ideally suited to act as a node in a network spread over a large area. The sensor works on the principle of soil impedance measurement by comparing the amplitude and phase of signals incident on and reflected from the soil in proximity of the sensor. The permittivity of the soil dielectric mixture which is calculated from these impedance measurements is used as input parameter to the dielectric mixing models which are used to estimate the ionic concentration in soil. The inbuilt wireless transceiver system is connected to a specially designed metamaterial inspired small antenna in order to reduce the sensor size while keeping the path losses to a minimum by using a low frequency. This composite right-left handed (CRLH) antenna for wireless transmission at 433 MHz doubles up as an underground, sensing element (external capacitor) and integrates with the on-board sensor for soil moisture and nutrient determination. The input impedance of the CRLH sensor, surrounded by the soil containing moisture and nutrient and other ions, is measured at multiple frequencies. It is shown that the change in moisture and ioinic-concentration can be successfully detected using the sensor. The inbuilt self-calibrating mechanism makes the sensor reliable at different environmental conditions and also useful for remote, underground and hand-held applications. A multi-power mode transceiver system has been designed tosupport the implementation of an energy efficient medium-access-control.
机译：实时和准确测量地下土壤的水分和养分对农业和环境研究至关重要。这项工作提出了一种新颖的车载解决方案，用于具有内置无线传输和接收功能的健壮，准确和自校准的土壤水分和养分传感器，使其非常适合充当大面积网络中的节点。传感器通过比较入射到传感器附近土壤上并从土壤反射的信号的幅度和相位，从而根据土壤阻抗测量原理进行工作。从这些阻抗测量值计算得出的土壤介电混合物的介电常数用作介电混合模型的输入参数，介电混合模型用于估算土壤中的离子浓度。内置的无线收发器系统连接到特殊设计的超材料激发的小型天线，以减小传感器尺寸，同时通过使用低频将路径损耗降至最低。这种用于433 MHz无线传输的复合左右手（CRLH）天线可以兼作地下传感元件（外部电容器），并与用于土壤水分和养分测定的车载传感器集成在一起。 CRLH传感器的输入阻抗被包含水分，养分和其他离子的土壤包围，可以在多个频率下进行测量。结果表明，使用该传感器可以成功检测出水分和碘浓度的变化。内置的自校准机制使传感器在不同的环境条件下都可靠，并且对于远程，地下和手持式应用也很有用。设计了一种多功率模式收发器系统，以支持节能型媒体访问控制的实现。

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    Pandey, Gunjan;

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  • 年度 2014
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