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 language | English (US) |
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Pages (from-to) | 165-175 |
Number of pages | 11 |
Journal | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 2545 |
DOIs | |
State | Published - Jun 23 1995 |
Externally published | Yes |
Event | Interferometry VII: Applications 1995 - San Diego, United States Duration: Jul 9 1995 → Jul 14 1995 |
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