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A New Scale Factor Adjustment Method for Magnetic Force Feedback Accelerometer.

Xiangqing Huang1, Zhongguang Deng2, Yafei Xie3

  • 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. hxq160@hust.edu.cn.

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PubMed
Summary
This summary is machine-generated.

A novel method dynamically adjusts magnetic force feedback accelerometer scale factors by injecting external current. This technique simplifies developing gravity gradient instruments without affecting noise levels.

Keywords:
accelerometeradjustment of scale factorgravity gradient instrumentmagnetic force feedback

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Area of Science:

  • Instrumentation
  • Geophysics
  • Aerospace Engineering

Background:

  • Developing gravity gradient instruments (GGI) requires precise matching of accelerometer scale factors.
  • Common mode accelerations must be rejected for accurate GGI performance.
  • Existing methods for scale factor adjustment can be complex.

Purpose of the Study:

  • To present a simple and effective method for adjusting the scale factor of magnetic force feedback accelerometers.
  • To enable dynamic adjustment of the acceleration-to-current transfer function.
  • To facilitate the development of rotating accelerometer GGI.

Main Methods:

  • Injecting an external current, combined with the normal feedback current, to the accelerometer's torque coil.
  • Dynamically varying the injected current to alter the acceleration-to-current transfer function.
  • Experimentally verifying scale factor adjustments and assessing noise levels.

Main Results:

  • Scale factors were adjusted from 33% smaller to 100% larger experimentally.
  • The method requires no extra assembly and is easy to operate.
  • No change in static noise level was observed with the injected current, confirming method validity.

Conclusions:

  • The presented method offers a simple, dynamic, and effective way to adjust accelerometer scale factors.
  • This technique is crucial for improving GGI performance by enabling precise accelerometer matching.
  • The method is validated experimentally and shows no adverse effects on accelerometer noise.