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Comparison between Modelled and Measured Magnetic Field Scans of Different Planar Coil Topologies for Stress Sensor
Robert Gibbs1, Gregory Moreton2, Turgut Meydan3
1Cardiff School of Engineering, Cardiff University, Queen's Buildings, Cardiff CF24 3AA, UK. GibbsRM@cardiff.ac.uk.
Sensors (Basel, Switzerland)
|March 22, 2018
Summary
Researchers explored four planar coil designs for stress-sensitive self-inductors. A new 3D magnetic field scanner validated finite element modeling of magnetic field distributions, confirming its utility for sensor development.
Area of Science:
- Electrical Engineering
- Materials Science
- Sensor Technology
Background:
- Stress-sensitive self-inductors utilizing magnetostrictive amorphous ribbons are crucial for advanced stress and pressure sensing applications.
- Investigating planar coil topologies is key to optimizing the performance of these self-inductor sensors.
Purpose of the Study:
- To construct and experimentally analyze four distinct planar coil topologies (Circular, Mesh, Meander, Square) for self-inductor sensors.
- To validate the accuracy of finite element modeling (FEM) by comparing it with experimental magnetic field measurements.
- To assess the efficacy of a novel three-dimensional (3D) magnetic field scanning system.
Main Methods:
- Fabrication of four planar coil topologies on PCB substrates.
- Measurement of magnetic field distribution using a new 3D magnetic field scanner with a tunneling magneto-resistance sensor (spatial resolution 5-10 µm, sensitivity <10 A/m).
- Comparison of experimental results with ANSYS Maxwell® FEM simulations for each coil topology.
Main Results:
- Experimental magnetic field measurements closely matched FEM predictions for all four coil topologies.
- The study successfully observed and analyzed corner and edge effects in the magnetic field distributions.
- 3D field analysis of the square coil confirmed the accuracy of both the experimental system and the FEM simulations.
Conclusions:
- The developed 3D magnetic field scanning system is validated as an accurate tool for analyzing magnetic fields.
- Finite element modeling using ANSYS Maxwell® is confirmed as a reliable method for predicting magnetic field behavior in these sensor designs.
- The findings support the utility of these planar coil-based self-inductors for stress and pressure sensing applications.
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