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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Published on: January 7, 2019

Fiber-optic interferometer for surface profile measurement with vibration suppression.

Taekmin Kwon1, Seung-Woo Kim

  • 1Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea.

Optics Express
|March 4, 2011
PubMed
Summary

This study presents a novel fiber-optic interferometer design for precise surface profiling. It effectively suppresses vibrations, achieving sub-wavelength accuracy even under significant disturbance.

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Area of Science:

  • Optics and Photonics
  • Metrology
  • Fiber Optic Sensing

Background:

  • Accurate surface profile measurement is crucial in various scientific and industrial applications.
  • Conventional interferometers are susceptible to environmental vibrations, limiting measurement precision.
  • Existing fiber-optic solutions often struggle with temporal fluctuations caused by external disturbances.

Purpose of the Study:

  • To introduce an improved fiber-optic interferometer design with enhanced vibration suppression capabilities.
  • To achieve sub-wavelength measurement precision for surface profiling in challenging environments.
  • To develop a robust interferometric system for accurate metrology.

Main Methods:

  • A multi-mode fiber is employed to generate a reference wavefront, selectively removing spatial distortion via bend loss.
  • Temporal fluctuations from vibration are cancelled by ensuring their presence in both measurement and reference waves.
  • An injection locking technique is utilized to stabilize reference wave intensity and interferometric fringe stability.

Main Results:

  • The proposed fiber-optic interferometer demonstrates effective suppression of temporal fluctuations caused by vibration.
  • Sub-wavelength measurement precision was achieved even with a 100-μm amplitude vibration.
  • Stable interferometric fringe intensity was maintained due to the injection locking technique.

Conclusions:

  • The developed fiber-optic interferometer offers a significant advancement in vibration-robust surface metrology.
  • The design enables high-precision measurements in environments previously unsuitable for interferometry.
  • This technology has potential applications in fields requiring sensitive surface analysis.