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High-resolution angle sensor using multiple peak positions of a double slit interference pattern.

Jong-Ahn Kim1, Jae Wan Kim1, Jae Yong Lee1

  • 1Center for Optical Metrology, Division of Physical Metrology, Korea Research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu 305-340, South Korea.

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Summary
This summary is machine-generated.

This study introduces a high-resolution angle sensor using a double slit (DS) for precise incident angle measurement. Averaging interference peaks improves accuracy and reduces nonlinearity errors.

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Area of Science:

  • Optics and Photonics
  • Metrology and Measurement Science

Background:

  • Accurate angle measurement is crucial in various scientific and industrial applications.
  • Existing angle sensors face limitations in resolution and linearity.

Purpose of the Study:

  • To propose and evaluate a novel high-resolution angle sensor based on a double-slit (DS) interference pattern.
  • To enhance measurement accuracy and reduce periodic nonlinearity errors.

Main Methods:

  • Designing a double slit (DS) to produce a multiple-order interference pattern with even modulation.
  • Analyzing the positions of intensity peaks in the interference pattern to determine the incident angle.
  • Averaging angle measurements from multiple peaks to improve resolution and reduce errors.

Main Results:

  • The double-slit angle sensor demonstrated high resolution, with an Allan deviation of 0.0002 arcseconds at a 4-second averaging time.
  • Periodic nonlinearity error was quantified to be less than 0.01 arcseconds.
  • Performance was validated through comparison with a commercial autocollimator.

Conclusions:

  • The proposed double-slit angle sensor offers superior resolution and reduced nonlinearity compared to conventional methods.
  • The technique of averaging multiple interference peaks effectively enhances sensor performance.
  • This DS-based sensor presents a promising solution for high-precision angle metrology.