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AC/DC Fields Demodulation Methods of Resonant Electric Field Microsensor.

Pengfei Yang1, Xiaolong Wen2, Zhaozhi Chu3

  • 1School of Applied Science, Beijing Information Science and Technology University, Beijing 100192, China.

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Summary

This study analyzes electric field microsensor signal characteristics and proposes new demodulation methods for DC, power frequency, and hybrid fields. The findings ensure accurate measurements in power systems.

Keywords:
AC/DC electric fieldsdemodulation methodselectric field sensorfrequency bandwidthmicro-electro-mechanical systems (MEMS)power systemsresonance

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Area of Science:

  • Electrical Engineering
  • Sensor Technology
  • Applied Physics

Background:

  • Electric field microsensors offer advantages like small size and low power consumption for power system applications.
  • Existing research focuses on new structures and resolution, lacking systematic analysis of signal characteristics and demodulation methods.
  • Understanding microsensor signal behavior under various electric fields is crucial for reliable power system monitoring.

Purpose of the Study:

  • To systematically analyze the signal characteristics of an improved resonant microsensor with coplanar electrodes.
  • To propose and verify matching demodulation methods for DC, power frequency, and AC/DC hybrid electric fields.
  • To establish theoretical limits for detectable electric field frequencies and confirm sensitivity consistency.

Main Methods:

  • Utilized an improved resonant microsensor with coplanar electrodes.
  • Conducted thorough analysis of signal characteristics under DC, power frequency, and AC/DC hybrid fields.
  • Developed and experimentally verified demodulation methods based on synchronous detection.

Main Results:

  • Theoretically determined that detectable electric field frequencies must be less than half the microsensor's resonant frequency.
  • Demonstrated identical microsensor sensitivities for AC/DC hybrid fields across different frequencies.
  • Achieved low uncertainties of 2.4% for DC and 1.5% for 50 Hz fields within 0-667 kV/m.
  • Experimental frequency characteristic tests (0-1 kHz) aligned with theoretical predictions.

Conclusions:

  • The proposed synchronous detection-based demodulation methods are effective for various electric fields.
  • The study provides a theoretical framework and experimental validation for electric field microsensor applications in power systems.
  • Accurate and reliable electric field measurements are achievable with the developed techniques.