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Related Experiment Videos

Velocity difference measurement with a fiber-optic coupler

Y Du1, B J Ackerson, P Tong

  • 1Department of Physics, Oklahoma State University, Stillwater 74078, USA.

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|September 8, 1998
PubMed
Summary

This study introduces a novel fiber-optic technique to measure velocity differences in fluids. The method uses light interference to accurately analyze turbulent flow and particle dynamics.

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Optical Engineering

Background:

  • Accurate measurement of fluid velocity differences is crucial for understanding complex phenomena like turbulence.
  • Traditional methods can be limited by spatial resolution or intrusive probes.
  • Developing non-intrusive, high-resolution techniques is an ongoing challenge in fluid dynamics.

Purpose of the Study:

  • To develop and validate a new interferometric fiber-optic technique for measuring velocity differences in spatially separated regions of a sample.
  • To assess the technique's accuracy and applicability across a range of spatial separations.
  • To demonstrate its utility for studying turbulent flow and particle settling dynamics.

Main Methods:

  • Utilizing two single-mode fibers to collect scattered light with identical wave vectors from distinct sample regions.

Related Experiment Videos

  • Illuminating the sample with a single coherent laser beam, causing interference of collected signals via a fiber-optic coupler.
  • Employing polarization-preserving fibers and coupler for high signal-to-noise ratio.
  • Measuring intensity fluctuations to determine velocity differences (ωv(L)) as a function of spatial separation (L).
  • Calculating and experimentally verifying an intensity autocorrelation function for rigid body rotation.

    • Main Results:

    • The experimental results demonstrated agreement with theoretical predictions for rigid body rotation.
    • The technique accurately measured velocity differences across spatial separations spanning two orders of magnitude.
    • The observed error was less than 5%, confirming the method's high precision.
    • The technique proved effective in analyzing both turbulent flow and particle settling dynamics.

    Conclusions:

    • The developed fiber-optic interferometry technique offers a precise and non-intrusive method for measuring fluid velocity differences.
    • Its accuracy and broad applicability make it a valuable tool for fluid dynamics research, particularly in turbulence and particle dynamics.
    • This technique holds significant potential for advancing the study of complex fluid behaviors.