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Related Experiment Videos

Absolute angle measurement using the earth-field-referenced hall effect sensors

P T Kolen1, J P Rhode, P R Francis

  • 1Electrical and Computer Engineering Department, San Diego State University, CA 92182.

Journal of Biomechanics
|March 1, 1993
PubMed
Summary

This study introduces a novel miniaturized absolute angle sensor using Earth's magnetic field. It offers high accuracy and immunity to errors for applications like joint rotation measurement.

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Area of Science:

  • Physics
  • Engineering
  • Biomedical Devices

Background:

  • Traditional angle sensors often suffer from B-field and temperature-induced errors.
  • Miniaturization and high accuracy are critical for advanced sensing applications.

Purpose of the Study:

  • To develop a miniaturized absolute angle sensor with high immunity to environmental errors.
  • To demonstrate the sensor's efficacy in measuring joint rotation.

Main Methods:

  • Utilized Hall generators referenced to Earth's magnetic field for self-normalization.
  • Implemented low-noise design and thermal compensation techniques.
  • Tested the sensor's performance using shoulder joint rotation measurement.

Main Results:

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  • Achieved a sensor bandwidth of DC to 100 Hz with a 44.5 dB signal-to-noise ratio.
  • Measured a maximum angular resolution of +/- 0.27 degrees.
  • Demonstrated less than 2% temperature-induced error between 25°C and 40°C.

Conclusions:

  • The developed Hall effect sensor provides accurate, self-normalized angle measurements.
  • The sensor exhibits high immunity to B-field and temperature variations.
  • Excellent agreement between theoretical and experimental results validates the sensor for biomechanical applications.