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Improved angle interferometer based on total internal reflection.

W Zhou1, L Cai

  • 1Department of Mechanical Engineering, Hong Kong University of Science and Technology, Hong Kong, China.

Applied Optics
|February 29, 2008
PubMed
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This study presents an improved angle interferometer using internal reflection, enhancing measurement accuracy by fixing the wave plate. This novel design offers higher resolution and measures pitch and yaw for moving objects.

Area of Science:

  • Optics and Photonics
  • Metrology and Measurement Science

Background:

  • Angle measurement is crucial in various scientific and industrial applications.
  • Traditional interferometers can suffer from errors due to component rotation, limiting accuracy.

Purpose of the Study:

  • To develop an improved angle interferometer that eliminates wave-plate rotation errors.
  • To enhance the resolution and measurement capabilities of angle interferometers for dynamic objects.

Main Methods:

  • A novel angle interferometer design featuring a fixed wave plate between a rhomb assembly and a retroreflector.
  • Theoretical analysis and experimental verification of the proposed interferometer.
  • Addressing nonlinearity errors in the measurement equation.

Main Results:

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  • The improved interferometer eliminates the influence of wave-plate rotation on angle measurements.
  • The new design offers doubled resolution compared to conventional methods.
  • Successful measurement of pitch and yaw for moving objects was demonstrated.
  • Performance improvements were particularly significant at large rotation angles.

Conclusions:

  • The fixed wave-plate design significantly enhances angle interferometer performance.
  • This improved interferometer provides a compact, high-resolution solution for precise angle and motion measurement.