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Automatic compensation system for eccentricity error of absolute optical encoder.

Changhai Zhao1, Qiuhua Wan1, Lihui Liang1

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The Review of Scientific Instruments
|July 24, 2024
PubMed
Summary
This summary is machine-generated.

Eccentric error significantly impacts optical encoder precision. This study introduces an automatic compensation system using radial code paths, reducing mean square error from 21.25 to 3.66 arc seconds.

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Area of Science:

  • Optoelectronics
  • Precision Engineering
  • Metrology

Background:

  • Eccentric error is a primary source of inaccuracy in high-precision optical encoders.
  • Traditional encoder designs often struggle to mitigate this inherent error.
  • Accurate measurement and compensation are crucial for advanced applications.

Purpose of the Study:

  • To develop and validate an automatic error compensation system for optical encoders.
  • To reduce the impact of eccentric error on encoder accuracy.
  • To enhance the overall performance of high-precision optical encoders.

Main Methods:

  • Integration of a novel radial code path on the encoder disk, perpendicular to the fine code path.
  • Utilizing moiré fringe signals from the radial code channel to measure encoder disk eccentricity in real-time.
  • Implementation of an eccentricity error compensation algorithm based on measured eccentricity.

Main Results:

  • The developed system successfully measured encoder disk eccentricity.
  • Real-time compensation significantly reduced the mean square error of the encoder.
  • Mean square error decreased from 21.25 arc seconds before compensation to 3.66 arc seconds after compensation.

Conclusions:

  • The proposed automatic error compensation system effectively mitigates eccentric error in optical encoders.
  • This method offers a substantial improvement in encoder accuracy.
  • The system demonstrates high potential for enhancing precision in optical measurement devices.