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Real-time three-color reflection holographic interferometer.

Jean-Michel Desse1, Jean-Louis Tribillon

  • 1Office National d'Etudes et de Recherches Aérospatiales, 5, Boulevard Paul Painlevé, 9045, Lille, France. Jean-Michel.Desse@onera.fr

Applied Optics
|December 24, 2009
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Summary
This summary is machine-generated.

Researchers developed a compact real-time three-color reflection holographic interferometer (RCRHI) for high-speed flow analysis. This new RCRHI system successfully captured detailed gas density fields in unsteady flows.

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Area of Science:

  • Fluid Dynamics
  • Optical Physics
  • Holography

Background:

  • High-speed flow analysis requires advanced optical diagnostic techniques.
  • Traditional interferometry methods face limitations in capturing dynamic flow phenomena.
  • Real-time, multi-wavelength holographic interferometry offers potential for improved flow visualization.

Purpose of the Study:

  • To develop and validate a compact real-time three-color reflection holographic interferometer (RCRHI).
  • To apply the RCRHI for analyzing the two-dimensional unsteady wake flow around a circular cylinder.
  • To demonstrate the capability of RCRHI in capturing instantaneous gas density fields in high-speed flows.

Main Methods:

  • Development of a classical in-line Lippmann-Denisyuk holographic setup using a reflection panchromatic silver-halide holographic plate.
  • Optimization of holographic plate treatment to achieve 50% diffraction efficiency for red, green, and blue wavelengths.
  • Application of the RCRHI to study a circular cylinder wake flow at Mach 0.45, recording interferograms at high framing rates.

Main Results:

  • The RCRHI successfully recorded high-contrast, saturated color interferograms of the unsteady wake flow.
  • Quasi-automated analysis of interferograms was facilitated by the high quality of recorded data.
  • The temporal evolution of the instantaneous gas density field over one period of the phenomenon was obtained.

Conclusions:

  • The developed RCRHI is a viable tool for analyzing high-speed fluid flows with high spatial and temporal resolution.
  • The RCRHI system overcomes challenges related to gelatin shrinkage in holographic plates for improved performance.
  • Future work will explore multidirectional tomography with RCRHI for three-dimensional flow analysis.