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Related Experiment Videos

Quantitative flow visualization in supersonic jets through tomographic inversion of wavefronts estimated through

Hemanth Thayyullathil1, R Mohan Vasu, Rajan Kanhirodan

  • 1Department of Physics, Indian Institute of Science, Bangalore-560 012, India.

Applied Optics
|June 30, 2006
PubMed
Summary

We developed a simple method to reconstruct wavefronts transilluminating supersonic jets by measuring local slopes. This technique accurately determines object density distributions, comparable to existing phase-retrieval methods.

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Area of Science:

  • Optical physics
  • Fluid dynamics
  • Tomography

Background:

  • Wavefront distortions provide insights into fluid dynamics.
  • Accurate reconstruction of wavefronts is crucial for analyzing supersonic jets.

Purpose of the Study:

  • To present a simple and effective method for wavefront reconstruction.
  • To determine density distributions of supersonic jets using optical measurements.

Main Methods:

  • Measuring local wavefront slopes using shadow displacements of a random-dot pattern.
  • Estimating smooth wavefronts via least-squares curve fitting.
  • Tomographically inverting wavefront distortion to obtain density distributions.

Main Results:

Related Experiment Videos

  • Successfully reconstructed wavefronts transilluminating supersonic jets.
  • Obtained density distributions comparable to phase-retrieval methods.
  • Demonstrated the efficacy of the slope-measurement technique.

    • Conclusions:

    • The presented method offers a straightforward approach to wavefront reconstruction.
    • This technique provides accurate density information for supersonic jets.
    • The results validate the use of slope measurements in optical metrology.