Low-Cost Portable Readout System Design for Inductively Coupled Resonant Sensors
Low-Cost Portable Readout System Design for Inductively Coupled Resonant Sensors
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DOI：
10.1109/tim.2022.3173277
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发表时间：
2022-01-01
影响因子：
5.6
通讯作者：
Neihart, Nathan M.
中科院分区：
文献类型：
--
作者：
Roy, Subhanwit;Chan, Yee Jher;Neihart, Nathan M.
基于螺旋线圈的电感-电容（LC）谐振传感器在农业、医疗保健、生物制造和消费电子产品中有许多应用。使用矢量网络分析仪（VNA）来询问这种传感器的传统技术是昂贵的并且通常不是便携式的，而定制读出遭受高成本、低范围的可用询问距离或低频率范围。本文提出了一种基于相干解调技术的简单、低成本、便携式读出设计。一个完整的理论分析，研究如何询问距离与其他电路参数。最后，一个完整的读出系统，实现了使用印刷电路板技术和市售的现成组件。该系统工作频率为1 ~ 100 MHz，功耗为1.26 W。测量结果表明，该系统运行可靠，可重复的询问距离高达5厘米。
Spiral coil-based inductor-capacitor (LC) resonant sensors have seen many applications in agriculture, healthcare, biomanufacturing, and consumer electronics. Traditional techniques to interrogate such sensors using vector network analyzers (VNAs) are expensive and often not portable, whereas custom readouts suffer from high cost, low range of usable interrogation distances, or low frequency range. This article proposes a new simple, low-cast, and portable readout design based on the technique of coherent demodulation. A complete theoretical analysis examining how the interrogation distance is related to other circuit parameters is presented. Finally, a complete readout system was implemented using printed circuit board technology and commercially available off-the-shelf components. The system operates between I and 100 MHz and the fabricated system consumes 1.26 W. Measurements show that the system operates reliably and repeatably with interrogation distances up to 5 cm.