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A novel optical rotary encoder with eccentricity self-detection ability.

Xuan Li1, Guoyong Ye1, Hongzhong Liu1

  • 1State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China.

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Summary
This summary is machine-generated.

This study introduces a new optical rotary encoder that self-detects eccentricity errors. This innovation enhances accuracy by measuring angular and radial displacements simultaneously, improving rotary encoder performance.

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Area of Science:

  • Metrology
  • Optical Engineering
  • Instrumentation

Background:

  • Eccentricity error is a primary limitation in optical rotary encoder accuracy.
  • Real-time detection and compensation of eccentricity are crucial for improving encoder precision.

Purpose of the Study:

  • To present a novel rotary optical encoder capable of self-detecting eccentricity error.
  • To enable synchronous measurement of angular and radial displacements for enhanced accuracy.

Main Methods:

  • Utilizes a spider-web-patterned scale grating as the measurement standard.
  • Employs a dual-head scanning unit with orthogonally arranged heads to scan the grating.
  • Performs synchronous scanning along both angular and radial directions.

Main Results:

  • The developed prototype successfully realized eccentricity self-detection.
  • Self-detection results showed strong agreement with measurements from an optical microscope.
  • Experimental data preliminarily validated the encoder's feasibility and effectiveness.

Conclusions:

  • The proposed rotary optical encoder effectively achieves self-detection of eccentricity error.
  • The novel design offers a promising approach to enhance the accuracy of optical rotary encoders.
  • This technology has the potential to significantly improve precision in angular measurement systems.