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Related Experiment Video

Updated: Jan 3, 2026

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Development of an Image Grating Sensor for Position Measurement.

Shaowei Fu1,2, Fang Cheng1, Tegoeh Tjahjowidodo2,3

  • 1Advanced Remanufacturing and Technology Centre (Agency for Science, Technology and Research), Singapore 637143, Singapore.

Sensors (Basel, Switzerland)
|November 17, 2019
PubMed
Summary

This study introduces an image grating system for precise 1D position measurement, offering improved robustness and flexibility over optical encoders. The system achieves high accuracy, up to ±0.3 µm, for industrial applications.

Keywords:
image gratingmeasurement error correctionposition measurementsubpixel image registration

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Area of Science:

  • Metrology
  • Optical Engineering
  • Instrumentation

Background:

  • Conventional optical encoders have limitations in robustness and flexibility for 1D position measurement.
  • Precision measurement systems are crucial for various industrial and scientific applications.

Purpose of the Study:

  • To present a novel precision position-measurement system utilizing the image grating technique.
  • To demonstrate the system's enhanced robustness and flexibility compared to traditional optical encoders.
  • To achieve high-accuracy 1D position measurements for diverse applications.

Main Methods:

  • Development of a system using an image grating on a linear stage and a line scan camera.
  • Implementation of subpixel image registration and pattern correlation in the frequency domain for computational efficiency.
  • Integration of a lens distortion model for error compensation and improved measurement accuracy.

Main Results:

  • The developed image grating system achieved a measurement accuracy of ±0.3 µm within a 50 mm range.
  • Further improved accuracy to ±0.2 µm within a 25 mm range.
  • Demonstrated customizable standoff distance, measurement range, and resolution through optical adjustments.

Conclusions:

  • The image grating system provides a robust and flexible alternative for precision 1D position measurement.
  • The system's accuracy and adaptability make it suitable for various precision measurement applications.
  • Frequency domain processing and lens distortion compensation are effective for enhancing performance.