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A new z-axis resonant micro-accelerometer based on electrostatic stiffness.

Bo Yang1, Xingjun Wang2, Bo Dai3

  • 1School of Instrument Science & Engineering, Southeast University, Nanjing 210096, China. yangbo20022002@163.com.

Sensors (Basel, Switzerland)
|January 9, 2015
PubMed
Summary
This summary is machine-generated.

This study presents a novel z-axis resonant micro-accelerometer utilizing electrostatic stiffness for improved performance. The device demonstrates a scale factor of 31.65 Hz/g, proving its practicality.

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Area of Science:

  • Microelectromechanical Systems (MEMS)
  • Inertial Sensors
  • Resonant Accelerometers

Background:

  • Traditional accelerometers face limitations in performance and stability.
  • Resonant accelerometers offer potential for enhanced sensitivity and accuracy.
  • Electrostatic stiffness provides a novel mechanism for decoupling sensing elements.

Purpose of the Study:

  • To design, simulate, fabricate, and experimentally validate a new z-axis resonant accelerometer.
  • To leverage electrostatic stiffness to improve accelerometer performance by decoupling sensing movement.
  • To analyze the sensitive theory and derive the scale factor equation for the novel design.

Main Methods:

  • Utilized Ansys simulation to verify the principles of the torsional accelerometer and plane resonators.
  • Fabricated the micro-accelerometer using a standard three-mask deep dry silicon on glass (DDSOG) process.
  • Developed detecting and control circuits for closed-loop self-oscillation and frequency measurement.

Main Results:

  • Simulation confirmed effective frequencies of 0.66 kHz for the torsional accelerometer and 13.3 kHz for the plane resonator.
  • Experimental results demonstrated a scale factor of 31.65 Hz/g.
  • Achieved a bias stability of 727 µg and a dynamic range exceeding 10 g.

Conclusions:

  • The novel z-axis resonant micro-accelerometer based on electrostatic stiffness is a practicable and high-performing inertial sensor.
  • The design effectively decouples sensing movement, leading to improved accelerometer performance.
  • Experimental validation confirms the potential of this new accelerometer technology for various applications.