Phase-conjugate holographic system for high resolution particle image velocimetry through thick-walled, curved windows

Donald H. Barnhart, Ronald J. Adrian, Carl Meinhart, George C. Papen

Research output: Contribution to journalConference article

3 Scopus citations

Abstract

A phase-conjugate holographic measurement system has been developed for the study of three-dimensional fluid velocity fields. The recording system produces threedimensional particle images with resolution, signal-to-noise ratio, accuracy and derived velocity fields that are comparable to high-quality two-dimensional photographic PIV (particle image velocimetry). The high image resolution is accomplished by using low fnumber optics, a fringe stabilised processing chemistry, and a phase conjugate play-back geometry that compensates for aberrations in the imaging system. In addition, the system employs a reference multiplexed, off-axis geometry for determining velocity directions using the cross-correlation technique, and a stereo camera geometry for determining the three velocity components. The combination of the imaging and reconstruction sub-systems make the analysis of volumetric PIV domains feasible. Recently, a new geometry for the HPIV system has been developed for imaging flows through thick-walled, curved windows. In the older geometry, there have been two sources inhibiting the use of windows: Window scattering and window induced aberrations. In the new system, these difficulties are avoided using side-scatter illumination of the particles and phase-conjugate reconstruction with a substitute window in place.

Original languageEnglish (US)
Pages (from-to)165-175
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume2545
DOIs
StatePublished - Jun 23 1995
Externally publishedYes
EventInterferometry VII: Applications 1995 - San Diego, United States
Duration: Jul 9 1995Jul 14 1995

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Keywords

  • Holography
  • Particle image velocimetry
  • Velocimetry

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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