Ultrarobust Wireless Interrogation for Sensors and Transducers: A Non-Hermitian Telemetry Technique
Ultrarobust Wireless Interrogation for Sensors and Transducers: A Non-Hermitian Telemetry Technique
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DOI：
10.1109/tim.2021.3107057
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发表时间：
2021
影响因子：
5.6
通讯作者：
Minye Yang;Zhilu Ye;M. Farhat;Pai-Yen Chen
中科院分区：
文献类型：
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作者：
Minye Yang;Zhilu Ye;M. Farhat;Pai-Yen Chen
本文介绍了一种非厄米奇偶时间（PT）对称遥测平台，能够无线和鲁棒地获取无源传感器和化学或压阻传感器的信息。我们从理论和实验上证明，PT对称射频（RF）系统由遵守宇称（空间反转）和时间反转对称性的有源阅读器和无源传感器组成，不仅可以提高灵敏度，而且可以提供快速、准确和鲁棒的传感器数据采集。由自发PT击穿引起的单向无反射特性可能导致高Q谐振，从而在测量的反射光谱中具有高分辨率。此外，传感器的有效电阻（电容）可以通过电子调谐有源读取器上的负阻抗转换器（变容二极管）来无线查询，这允许观察双波段无反射现象。与传统的遥测系统不同，测量结果对电感耦合强度的变化，即两个线圈天线之间的距离和对准是鲁棒的。所提出的PT对称遥测范例可能会对广泛的无线传感和仪器应用产生影响。
We herein introduce a non-Hermitian parity-time (PT)-symmetric telemetry platform, capable of wirelessly and robustly acquiring information of passive sensors and chemiresistive or piezoresistive transducers. We theoretically and experimentally demonstrate that the PT-symmetric radio frequency (RF) system, which consists of an active reader and a passive sensor to obey parity (space inversion) and time-reversal symmetries, may provide not only an improved sensitivity but also rapid, accurate, and robust acquisition of sensor data. The unidirectional reflectionless properties arising from the spontaneous PT symmetry-breaking may result in high- $Q$ resonances and thus high resolvability in the measured reflection spectrum. Furthermore, the sensor’s effective resistance (capacitance) can be wirelessly queried by electronically tuning the negative impedance converter (varactors) on the active reader, which allows observation of dual-band reflectionless phenomena. Unlike traditional telemetry systems, the measurement results are robust to the variations in the inductive coupling strength, namely, the distance and alignment between the two coil antennas. The proposed PT-symmetric telemetry paradigm may have an impact on a wide range of wireless sensing and instrumentation applications.