For resolving deficiencies of conventional tension measurement methods, this paper\nproposes a novel eddy current sensor with a single-coil structure based on the inverse magnetostrictive\neffect. An inductorââ?¬â??resistorââ?¬â??capacitor (LRC) model of eddy current sensor, which considers more\nparameters than the traditional inductorââ?¬â??resistor (LR) model, was established. The eddy current\nsensor was operated by a swept frequency signal that ranged from 0.1 MHz to 1.6 MHz, encompassing\nthe sensor resonant frequency. At the resonant frequency, the data of impedance magnitude and phase\nwere extracted and linear relations between the impedance parameters and the external tension were\nascertained. The experimental results show that the resonant frequency and impedance magnitude of\neddy current sensor will decrease linearly with the increase of the external tension, which is consistent\nwith the theoretical model. In addition, to improve sensor performance, the sleeve structure was\ndesigned to reduce the loss of magnetic field. Both finite element simulations and experimental results\ndemonstrate that the sleeve structure provides a higher permeability path to the magnetic field lines\nthan the non-sleeve structure and effectively improves sensor sensitivity and correlation coefficient.
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