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Modeling and sensitivity enhancement of 3-DoF coupled structured Delta-E effect magnetic sensor based on mode localization effect
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Modeling and sensitivity enhancement of 3-DoF coupled structured Delta-E effect magnetic sensor based on mode localization effect
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Modeling and sensitivity enhancement of 3-DoF coupled structured Delta-E effect magnetic sensor based on mode localization effect
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Journal Article
Modeling and sensitivity enhancement of 3-DoF coupled structured Delta-E effect magnetic sensor based on mode localization effect
2025
Overview
The multi-degree-of-freedom (m-DoF) weakly coupled resonators (WCR) based on the mode localization effect provide a viable method to achieve high-sensitivity detection. In this paper, we propose a 3-DoF mode-localized Delta-E effect magnetic sensor based on a coupled cantilever beam structure. The magnetic field induces a stiffness perturbation in the resonator through the Delta-E effect of the magnetostrictive material, leading to a mode localization effect. An extremely high relative sensitivity is achieved by detecting the mode amplitude ratio (AR). A finite element method (FEM) model of the sensor is constructed and the impact of structural parameters on sensor performance is further analyzed. With the optimization of the resonator structure, the measurement range of the 3-DoF WCR reaches 2.6 Oe with a nonlinear error of less than 5%, and the AR sensitivity reaches 15.58 AR/Oe, which is two orders of magnitude higher than that of a 2-DoF WCR under the same structural parameters. This research offers valuable insights for the analysis and design of high-sensitivity magnetic sensors and m-DoF WCR.
Publisher
IOP Publishing
