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Low-coherent light-source angular interferometer using a square prism and the angular-scanning technique.

Shyh-Tsong Lin1, Sheng-Lih Yeh, Chien-Wei Chang

  • 1Department of Electro-optical Engineering, National Taipei University of Technology, 1, Section 3, Taipei, Taiwan. f10402@ntut.edu.tw

Optics Letters
|October 17, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces an interferometer using low-coherent light and a square prism for precise absolute angular displacement measurements. Detecting shifts in the interference signal

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Area of Science:

  • Optics and Photonics
  • Metrology
  • Interferometry

Background:

  • Accurate angular displacement measurement is crucial in various scientific and industrial applications.
  • Traditional methods may face limitations in precision and absolute determination.

Purpose of the Study:

  • To propose and validate a novel interferometer for absolute angular displacement determination.
  • To utilize a low-coherent light source and angular scanning technique for enhanced measurement capabilities.

Main Methods:

  • Development of an interferometer incorporating a low-coherent light source and a square prism.
  • Implementation of an angular-scanning technique to modulate interference signals.
  • Analysis of correlogram shifts and envelope peak displacement for angle calculation.

Main Results:

  • Demonstrated the feasibility of absolute angular displacement determination using the proposed setup.
  • Successfully correlated angular displacement of the square prism with correlogram envelope peak shifts.
  • Presented experimental validation of the interferometer's performance.

Conclusions:

  • The developed interferometer offers a reliable method for absolute angular displacement measurements.
  • The angular-scanning technique effectively utilizes the envelope function of the interference signal for precise angle determination.
  • This approach provides a valuable tool for high-accuracy angular metrology.