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Vibration compensating beam scanning interferometer for surface measurement.

Haydn Martin1, Kaiwei Wang, Xiangqian Jiang

  • 1University of Huddersfield, Queensgate, Huddersfield, West Yorkshire, HD1 3DH, England.

Applied Optics
|March 4, 2008
PubMed
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This study introduces a novel surface measurement instrument using light beam scanning and fiber-optic interferometry for nanoscale measurements. It demonstrates effective active vibration compensation for accurate surface analysis even in disturbed environments.

Area of Science:

  • Optical Engineering
  • Metrology
  • Nanotechnology

Background:

  • Accurate measurement of nanoscale surface structures is crucial for advanced manufacturing and research.
  • Environmental vibrations and disturbances pose significant challenges to high-precision metrology instruments.
  • Existing surface measurement techniques often lack the required sensitivity or remote sensing capabilities.

Purpose of the Study:

  • To develop a new surface measurement instrument capable of nanoscale resolution.
  • To implement active vibration compensation for enhanced measurement stability.
  • To assess the instrument's performance under significant environmental disturbances.

Main Methods:

  • Coupling light beam scanning with a dispersive element and wavelength tuning.

Related Experiment Videos

  • Utilizing fiber-optic interferometry for surface topography measurement.
  • Employing multiplexed interferometers with near common paths for active vibration compensation.
  • Implementing closed-loop control of a piezoelectric transducer-mounted mirror for path length stabilization.

    • Main Results:

    • The developed instrument successfully measures nanoscale surface structures and form deviations.
    • Active vibration compensation significantly mitigates environmental disturbances.
    • Experiments confirmed the instrument's ability to perform accurate measurements despite large external vibrations.
    • The small optical probe allows for remote placement, increasing measurement flexibility.

    Conclusions:

    • The novel instrument offers a robust solution for high-precision nanoscale surface metrology.
    • Active vibration compensation is effective in maintaining measurement accuracy in challenging environments.
    • The system's design facilitates remote sensing and adaptability for various applications.