Abstract
It is still one of the main problems to observe and measure the non-steady and spatial complex flows for the fluid mechanics. Except 2D-PIV and SPIV, the Holographic Particle Image Velocimetry ( HPIV ) is one of the approaches to measure instantaneously the three component ( u, v, w) velocity vector field in a full 3D volume ( space ). In this paper, the displacements of the particles in a volume of the flow was recorded instantaneously by a holographic recording system which was designed and tested specially. Using the two exposure pulses of YAG lasers separately, the diffused illuminating lights and the reference lights with a symmetric optical arrangement using a beam-combiner-splitter device (BCS), it could have the reconstruction of the holographic ficlds of the particles with different exposures time and use the cross-correlation method to determinate the directions of the displacements of the particles. Using the stereoscopic PIV ( SPIV ) technique here, the particle images of every sectional view with a certain thickness (or equivalent the depth of field for the camera) in the holographic volume could be captured with stereoscopic method
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