Simple HPIV Technique Using Virtual Image Reconstruction Applied to Jet

In this study, simplified high spatial resolution measurement technique for three-dimensional velocity distributions was examined. The Holographic Particle Image Velocimetry (HPIV) was the technique to record the three-dimensional position of the tracer particle on the hologram. From the three dimensional holographic particle images, three dimensional velocity distribution could be calculated with high-spatial resolution. Ordinary the HPIV uses the phase-conjugated configuration to reconstruct the three dimensional particle position. Though with the technique the particle location could be obtained with high S/N ration and high spatial resolution, the technique had very complicated calibration procedure and sensitivity. Therefore, in this study using the virtual image, more simple extracting technique to reconstruct particle location were examined. The technique was simple in layout and had good S/N ratio and high spatial resolution. In the experiment, the technique was applied to measure upward air jet. S/N ratio of the extracted image was good enough to detect three dimensional particle location. Particles were detected with high resolution. Using the extracted particle locations, the three dimensional velocity could be calculated well showing the effectiveness of the technique.