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Related Experiment Video

Updated: Jan 20, 2026

Calibration Curves: Linear Least Squares
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Revised error calibration model of linear accelerometer on precision centrifuge.

Chuang Sun1, Shun-Qing Ren1, Chang-Hong Wang1

  • 1Space Control and Inertial Technology Research Center, Harbin Institute of Technology, Harbin 150001, China.

The Review of Scientific Instruments
|September 2, 2019
PubMed
Summary

This study introduces a revised calibration model for linear accelerometers, significantly improving accuracy by accounting for misalignments. The new model enhances precision centrifuge test results for critical aerospace and navigation applications.

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Area of Science:

  • * Instrumentation and Measurement
  • * Aerospace Engineering
  • * Sensor Calibration

Background:

  • * Standard linear accelerometer calibration models often fail to meet accuracy requirements due to unaddressed misalignments during precision centrifuge testing.
  • * Misalignments, radius errors, and nonlinearity are key error sources impacting accelerometer calibration accuracy.

Purpose of the Study:

  • * To develop a revised error calibration model for linear accelerometers that incorporates misalignment factors.
  • * To propose measurement methods for estimating various misalignments using a theodolite and the accelerometer itself.
  • * To enhance the overall calibration accuracy of linear accelerometers in precision centrifuge tests.

Main Methods:

  • * Establishment of coordinate systems to deduce precise accelerations along accelerometer input axes.
  • * Analysis of error sources to formulate a revised calibration model including misalignments, radius errors, and nonlinearity.
  • * Development of measurement techniques utilizing a theodolite and accelerometer in different centrifuge modes to estimate angular and radius misalignments.

Main Results:

  • * Initial angular misalignments were accurately estimated to be less than 0.5 arcminutes after adjustment.
  • * The common error calibration model showed significantly reduced adequacy and calibration accuracies below 6 × 10-3g/g without misalignment compensation.
  • * The revised model, with compensated misalignments, achieved precise error coefficient identification and calibration accuracies exceeding 1.5 × 10-3g/g.

Conclusions:

  • * Accounting for misalignments is crucial for achieving high-accuracy linear accelerometer calibration in precision centrifuge tests.
  • * The revised calibration model effectively improves accuracy and identifies error coefficients more precisely.
  • * The proposed measurement methods enable accurate estimation of critical misalignments, leading to superior calibration performance.