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A MEMS Electrochemical Angular Accelerometer with Silicon-Based Four-Electrode Structure.

Mingbo Zhang1,2, Qinghua Liu1,2, Maoqi Zhu1,2

  • 1State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China.

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|March 28, 2024
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Summary

This study introduces a novel MEMS electrochemical angular accelerometer. The device achieves higher sensitivity and lower noise, showing promise for rotational seismology applications.

Keywords:
electrochemical angular accelerometermicroelectromechanical systemrotational sensorsilicon-based four-electrode structure

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Area of Science:

  • MEMS (Micro-Electro-Mechanical Systems)
  • Electrochemical Sensors
  • Angular Acceleration Measurement

Background:

  • Traditional electrochemical angular accelerometers face challenges with complex assembly and manual alignment.
  • Existing designs often have limitations in sensitivity and noise performance.

Purpose of the Study:

  • To develop a MEMS electrochemical angular accelerometer with an integrated silicon-based four-electrode structure.
  • To simplify fabrication processes and enhance device performance, including sensitivity and noise levels.

Main Methods:

  • Fabrication of a silicon-based four-electrode structure using single-piece integrative manufacturing and conventional MEMS processes (wafer-level bonding and etching).
  • Optimization of geometrical parameters through numerical simulations to improve fluid resistance and cathode area.
  • Characterization of the device's sensitivity and noise performance.

Main Results:

  • The fabricated MEMS electrochemical angular accelerometer achieved a maximum sensitivity of 1458 V/(rad/s²) at 0.01 Hz.
  • A minimum noise level of -164 dB was recorded at 1 Hz.
  • The device demonstrated significantly higher sensitivities and lower noise levels compared to previous electrochemical angular accelerometers.

Conclusions:

  • The developed MEMS electrochemical angular accelerometer offers superior performance characteristics.
  • The simplified fabrication and enhanced sensitivity indicate strong potential for rotational seismology and other related fields.