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A Subnano-g Electrostatic Force-Rebalanced Flexure Accelerometer for Gravity Gradient Instruments.

Shitao Yan1, Yafei Xie2, Mengqi Zhang3

  • 1MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China. yanshitao@hust.edu.cn.

Sensors (Basel, Switzerland)
|November 22, 2017
PubMed
Summary
This summary is machine-generated.

A novel electrostatic accelerometer achieves sub-nanogram sensitivity for gravity gradient instruments. Its design minimizes noise to below 0.3 ng/√Hz, meeting stringent requirements for geophysical exploration.

Keywords:
capacitive displacement transducerelectrostatic force-rebalancedflexure accelerometerrotating accelerometer gravity gradient instrumentsubnano-g resolution

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Area of Science:

  • Geophysics
  • Instrument Science

Background:

  • Gravity gradient instruments require highly sensitive accelerometers.
  • Existing accelerometers face limitations in noise and cross-axis sensitivity.

Purpose of the Study:

  • To design and demonstrate a sub-nanogram electrostatic force-rebalanced flexure accelerometer.
  • To meet the noise requirements for rotating accelerometer gravity gradiometers.

Main Methods:

  • Utilized an electrostatic force-rebalanced flexure design with a large proof mass.
  • Implemented high vacuum packaging and air-tight sealing.
  • Performed correlation analysis with a commercial triaxial seismometer.

Main Results:

  • Achieved thermal Brownian noise below 0.2 ng/√Hz (Q=15, f0≈7.4 Hz).
  • Demonstrated self-noise below 0.3 ng/√Hz from 0.2 to 2 Hz.
  • Designed measurement range of ±1 mg.
  • Exhibited high cross-axis rejection due to the novel design.

Conclusions:

  • The developed accelerometer meets the demanding noise specifications for rotating gravity gradiometers.
  • The novel design offers improved performance in terms of sensitivity and noise reduction.
  • This technology advances capabilities in precision geophysical measurements.