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Automatic alignment of a displacement-measuring heterodyne interferometer.

Jennifer E Logan1, Peter G Halverson, Martin W Regehr

  • 1Mission Research Corporation, Torrance, California 90503, USA.

Applied Optics
|August 1, 2002
PubMed
Summary

This study introduces an automated alignment technique for interferometric gauges using circular beam modulation and digital signal processing. This method ensures optimal beam path alignment, minimizing drift for precise displacement measurements.

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Area of Science:

  • Optical metrology
  • Precision engineering
  • Interferometry

Background:

  • Interferometric gauges require precise beam alignment for accurate displacement measurements.
  • Alignment drift can significantly impact measurement fidelity.
  • Existing alignment methods may be manual or less robust against environmental changes.

Purpose of the Study:

  • To develop and validate an automated beam alignment technique for displacement-measuring interferometric gauges.
  • To enhance measurement stability and minimize sensitivity to alignment drift.
  • To implement digital control for modulation, demodulation, and filtering functions.

Main Methods:

  • Circular modulation of the launched beam.
  • Synchronous demodulation of the displacement signal to determine alignment error.

Related Experiment Videos

  • A control system utilizing the error signal to maintain optimal beam path.
  • Digital implementation of lock-in amplifier functionalities.

    • Main Results:

    • Successful demonstration of automated beam alignment for interferometric gauges.
    • Minimized sensitivity to alignment drift through a robust control system.
    • Validation on a developmental gauge for the Space Interferometry Mission.

    Conclusions:

    • The described technique effectively automates beam alignment in interferometric gauges.
    • Digital signal processing enhances the precision and reliability of the alignment system.
    • This method is suitable for demanding applications like space-based interferometry.