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Design and Modification of a High-Resolution Optical Interferometer Accelerometer.

Yuan Yao1,2, Debin Pan1,2, Jianbo Wang2

  • 1Wuhan National Lab for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.

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Summary

A novel Micro-Opto-Electro-Mechanical Systems (MOEMS) accelerometer achieves ultra-low self-noise of 15 ng/Hz1/2. This high-precision device is ideal for seismic monitoring and inertial navigation applications.

Keywords:
MOEMS accelerometerdiffraction gratingsinterferometrylow-g accelerometer

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Area of Science:

  • Optics
  • Micro-Electro-Mechanical Systems (MEMS)
  • Sensor Technology

Background:

  • Micro-Opto-Electro-Mechanical Systems (MOEMS) accelerometers offer high precision and anti-electromagnetic disturbance capabilities.
  • Existing MOEMS accelerometers show promise for inertial navigation and seismic monitoring.

Purpose of the Study:

  • To propose a modified micro-grating-based accelerometer.
  • To introduce a new design method for characterizing grating interferometers.
  • To develop and evaluate a high-sensitivity MOEMS accelerometer.

Main Methods:

  • Designed and fabricated a MEMS sensor chip with high sensitivity.
  • Modified the processing circuit for the accelerometer.
  • Modeled the micro-grating interference measurement system and analyzed response sensitivity.
  • Built and benchmarked the accelerometer against a commercial seismometer.

Main Results:

  • Achieved an ultra-low self-noise floor of 15 ng/Hz1/2.
  • Demonstrated high sensitivity and precision in the developed accelerometer.
  • Validated performance through detailed benchmarking with a commercial seismometer.

Conclusions:

  • The modified micro-grating-based MOEMS accelerometer exhibits ultra-low self-noise.
  • The developed accelerometer is a promising candidate for advanced inertial navigation and seismic monitoring.
  • The new design method effectively characterizes the grating interferometer for improved performance.