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Full Digital Processing System of Photoelectric Encoder.

Changhai Zhao1, Qiuhua Wan1, Lihui Liang1

  • 1Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.

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|November 14, 2019
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Summary
This summary is machine-generated.

This study introduces a digital photoelectric encoder that maintains accuracy despite environmental changes. The novel design significantly reduces errors, ensuring reliable performance in demanding conditions.

Keywords:
error compensationfull digitalnormalizationphotoelectric encoder

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Area of Science:

  • Engineering
  • Instrumentation
  • Signal Processing

Background:

  • Photoelectric encoder signals degrade over time or with environmental changes, impacting accuracy.
  • Degradation can lead to critical errors in encoder measurements.
  • Maintaining high accuracy is crucial, especially in harsh environments.

Purpose of the Study:

  • To develop a photoelectric encoder with enhanced accuracy and environmental stability.
  • To implement a full digital processing method for signal correction.
  • To reduce encoder volume and improve performance.

Main Methods:

  • Converting receiver signal current to voltage using current limiting resistance.
  • Processing all signals digitally within a data processor.
  • Normalizing signals and calculating encoder angle to compensate for errors.

Main Results:

  • Reduced encoder error from 167 arcseconds to 53 arcseconds.
  • Significantly reduced encoder volume.
  • Maintained high accuracy during environmental variations.

Conclusions:

  • The proposed digital processing method enhances photoelectric encoder accuracy and stability.
  • The encoder is suitable for use in diverse and harsh environments.
  • The system offers a robust solution for precise angle measurement.