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Rotation angle measurement based on white-light interferometry with a standard optical flat.

Hyo Geun Yun1, Seung Hwan Kim, Heung Sun Jeong

  • 1Department of Physics, Inha University, 253 Yonghyun-dong, Nam-gu, Incheon 402-751, South Korea.

Applied Optics
|February 24, 2012
PubMed
Summary

This study introduces a simple white-light interferometric technique for precise one-dimensional rotation angle measurement. The method utilizes a parallel plate to achieve accurate angle determination with minimal uncertainty.

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Area of Science:

  • Optics and Photonics
  • Metrology
  • Interferometry

Background:

  • Accurate measurement of rotation angles is crucial in various scientific and industrial applications.
  • Traditional methods may have limitations in precision or complexity.
  • Optical interferometry offers a high-precision measurement approach.

Purpose of the Study:

  • To develop a simple and accurate white-light interferometric method for measuring one-dimensional rotation angles.
  • To utilize the phase change in an interference pattern for angle determination.
  • To demonstrate the method's effectiveness over a specific angle range.

Main Methods:

  • A white-light interferometer was employed.
  • An optical plane parallel plate with a standard refractive index was placed in one arm of the interferometer.
  • The phase change of the interference pattern during the plate's rotation was analyzed.
  • The rotation angle was determined based on the observed phase shift.

Main Results:

  • The proposed method successfully measured one-dimensional rotation angles.
  • Accurate angle measurements were achieved over a range from 0° to 40°.
  • The maximum uncertainty in the angle measurement was found to be 0.057°.

Conclusions:

  • The developed white-light interferometric method provides a simple yet accurate means for rotation angle measurement.
  • The technique is suitable for applications requiring precise angular determination within the demonstrated range.
  • The use of a standard optical plate simplifies the experimental setup.