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A differential inductive linear displacement sensor against common-mode interference.

Jiayi Chen1, Wei Xiong2, Yuan Tan1

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Summary
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This study introduces a novel differential inductive displacement sensor for precise measurements in harsh environments. The improved sensor design offers high resolution and accuracy, making it ideal for industrial applications.

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Area of Science:

  • * Electrical Engineering
  • * Sensor Technology
  • * Metrology

Background:

  • * Traditional inductive displacement sensors offer interference resistance but lack precision.
  • * Harsh industrial environments necessitate robust and accurate measurement solutions.

Purpose of the Study:

  • * To develop a high-accuracy inductive displacement sensor using a differential structure.
  • * To mitigate common-mode interference and improve measurement precision.

Main Methods:

  • * Designed a differential inductive sensor with opposing coils and optimized geometry via finite element simulation.
  • * Implemented a spatial phase shift to eliminate third-harmonic distortion.
  • * Applied amplitude compensation and DC offset correction algorithms to address installation errors.

Main Results:

  • * Achieved a resolution of 1 μm over a 200 mm measurement range.
  • * Reduced peak-to-peak error from 70 μm to 21 μm.
  • * Demonstrated a nonlinearity error of 0.014% after error correction.

Conclusions:

  • * The proposed differential inductive sensor provides precise displacement measurement with high accuracy.
  • * Its simple structure, cost-effectiveness, and reliability make it suitable for widespread industrial use.