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Measurement method for roll angular displacement with a high resolution by using diffraction gratings and a

Shanzhi Tang1, Zhao Wang2, Jianmin Gao3

  • 1Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.

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Summary

This study introduces a novel method for measuring roll angles using diffraction gratings and a laser heterodyne interferometer. The technique achieves high-resolution angle measurements, overcoming limitations of traditional interferometers.

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Area of Science:

  • Optics and Photonics
  • Metrology
  • Mechanical Engineering

Background:

  • Direct roll angle measurement is challenging for conventional interferometers due to low axial sensitivity.
  • The axial direction is orthogonal to the roll angular displacement plane, limiting direct measurement capabilities.

Purpose of the Study:

  • To develop a high-resolution method for measuring small roll angles.
  • To overcome the limitations of commercial interferometers in measuring roll angles.

Main Methods:

  • A novel measurement setup combining diffraction gratings with a laser heterodyne interferometer.
  • Positioning the diffraction grating in the roll angular displacement plane and the interferometer orthogonally.

Main Results:

  • Achieved a high resolution of 0.002" for roll angle measurement.
  • Demonstrated precise testing of roll angular displacement, especially for very small angles.
  • Experimental validation confirmed the method's feasibility and practicality.

Conclusions:

  • The proposed diffraction grating and laser heterodyne interferometer method enables accurate and high-resolution roll angle measurement.
  • This technique offers a practical solution for applications requiring precise angular metrology.