Coupling-independent, Real-time Wireless Resistive Sensing through Nonlinear PT-symmetry

TL;DR

This paper introduces a novel wireless resistive sensing method using PT-symmetry that enables real-time, coupling-independent, and robust measurements without sweeping, simplifying system design and improving accuracy.

Contribution

The work presents a coupling-independent wireless sensing technique utilizing PT-symmetry, with a theoretical framework and correction strategy to enhance robustness and accuracy.

Findings

Achieved real-time wireless sensing of resistive sensors

Demonstrated robustness against detuning errors

Developed a correction method reducing errors by an order of magnitude

Abstract

We report the realization of coupling-independent, robust wireless sensing of fully-passive resistive sensors. PT-symmetric operation obviates sweeping, permitting real-time, single-point sensing. Self-oscillation is achieved through a fast-settling nonlinearity whose voltage amplitude is proportional to the sensor's resistance. These advances markedly simplify the reader. A dual time-scale theoretical framework generalizes system analysis to arbitrary operating conditions and a correction strategy reduces errors due to detuning from PT-symmetric conditions by an order of magnitude.