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Related Experiment Videos

Development of a diffraction-type optical triangulation sensor.

Chien-Hung Liu1, Wen-Yuh Jywe, Chao-Kwai Chen

  • 1Institute of Electro-Optical and Materials Science, National Huwei University of Science and Technology, Huwei, Yunlin 632, Taiwan. carus@ckit.edu.tw

Applied Optics
|November 13, 2004
PubMed
Summary

This study introduces a novel diffraction-type optical triangulation sensor. The sensor simultaneously measures linear displacement and three angular motion errors of moving objects using laser triangulation.

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Area of Science:

  • Optics and Photonics
  • Mechanical Engineering
  • Metrology

Background:

  • Laser triangulation is a common method for displacement measurement.
  • Measuring angular motion errors often requires separate sensors.
  • Existing methods may lack simultaneous linear and angular measurement capabilities.

Purpose of the Study:

  • To develop a novel optical triangulation sensor.
  • To enable simultaneous measurement of linear displacement and three angular motion errors.
  • To leverage diffraction principles for enhanced sensing.

Main Methods:

  • Utilized the diffraction theorem and laser triangulation principles.
  • Designed a sensor comprising a laser source, two quadrant detectors, and a reflective diffraction grating.

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  • Employed 0- and +1-order diffraction rays for position detection.

    • Main Results:

    • The developed sensor successfully obtains linear displacement.
    • The sensor simultaneously measures three angular motion errors (pitch, yaw, roll).
    • Demonstrated the effectiveness of optical triangulation with diffraction for multi-dimensional motion sensing.

    Conclusions:

    • The proposed diffraction-type optical triangulation sensor offers a unified solution for displacement and angular error measurement.
    • This sensor provides a significant advantage by measuring multiple motion parameters simultaneously.
    • The technology has potential applications in precision engineering and robotics.