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A Combined Magnetoelectric Sensor Array and MRI-Based Human Head Model for Biomagnetic FEM Simulation and Sensor

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Magnetoelectric (ME) sensors show significant magnetic crosstalk, reducing response by up to 15.6% at close range. Despite crosstalk, ME sensors maintain linear responses, enabling independent simulation of sources and sensor outputs.

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MRI databiomagnetic sensorcrosstalkfinite-element method (FEM)human head modelmagnetic fieldsmagnetoelectric effectmultiferroic devicemultiscale modelsensor array

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Area of Science:

  • Biomagnetic measurements
  • Sensor technology
  • Computational modeling

Background:

  • Magnetoelectric (ME) sensors are promising for biomagnetic measurements.
  • Understanding magnetic crosstalk and response linearity is crucial for ME sensor arrays.

Purpose of the Study:

  • Investigate magnetic crosstalk and response linearity in ME sensor arrays.
  • Develop a multiscale 3D finite-element method (FEM) model for simulating ME sensor behavior.
  • Analyze sensor performance under various excitation configurations.

Main Methods:

  • Combined multiscale 3D FEM model with 15 ME sensors and a human head model.
  • Simulated homogeneous and inhomogeneous magnetic field excitations.
  • Assumed a linearized material model at the small-signal working point.

Main Results:

  • Significant magnetic crosstalk observed between adjacent sensors, reducing response by up to 15.6% at 5 mm.
  • Sensor response increased with distance as crosstalk diminished (up to 5 cm).
  • Outermost sensors experienced less crosstalk than central ones; vertical crosstalk exceeded horizontal crosstalk.
  • Near-constant sensitivities confirmed linear sensor response despite crosstalk.

Conclusions:

  • Magnetic crosstalk significantly impacts ME sensor arrays, particularly at close proximity.
  • ME sensors demonstrate linear responses, allowing independent simulation of sources and responses.
  • The developed FEM model provides a valuable tool for optimizing ME sensor design and application in biomagnetism.