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Summary
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This study demonstrates how bimodal resonance in inductive sensors can precisely measure coil separation and angular displacement. This innovative technique achieves accuracy within ±1 mm and ±1° for displacement sensing.

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Area of Science:

  • Electrical Engineering
  • Sensor Technology
  • Physics

Background:

  • Inductive sensors are widely used for non-contact measurements.
  • Understanding resonance phenomena is crucial for enhancing sensor performance.
  • Existing methods for displacement sensing have limitations in accuracy and complexity.

Purpose of the Study:

  • To investigate the generation of bimodal resonance in over-coupled inductive sensors.
  • To exploit this phenomenon for measuring relative separation and angular displacement.
  • To validate analytical and simulation models against experimental data.

Main Methods:

  • Developing and analyzing mutually over-coupled inductive sensor models (solenoid and planar coils).
  • Employing first-order analytical functions and finite element modeling for simulation.
  • Conducting experimental validation of the bimodal resonance phenomenon and displacement measurement capabilities.

Main Results:

  • Observed and validated bimodal resonance phenomena in different inductive sensor configurations.
  • Achieved experimental predictability of co-planar separation within ±1 mm.
  • Achieved experimental predictability of angular displacement within ±1°.

Conclusions:

  • First-order physics-based models for inductive sensors are validated.
  • Demonstrated a novel proof of principle for using resonant phenomena in inductive array sensors.
  • This technique offers a precise method for evaluating relative displacement between sensor elements.