Session Cj - Experimental Techniques.
ORAL session, Sunday, November 23
310, Moscone Center
Holographic PIV (HPIV) is a promising 3D velocity field measurement technique providing high spatial-temporal resolution needed for understanding complex and turbulent flows. Due to the requirement of conventional PIV data processing scheme (high seeding density and signal-to-noise ratio), an HPIV system often evolves into a complicated off-axis configuration, which requires expensive equipment (injection-seeded pulsed laser), elaborate optical components, and accurate optical alignment. Although this configuration shows great potential of providing highly spatially resolved 3D instantaneous velocity fields, the complications involved prevent itself from being widely used. For this reason a low cost automatic HPIV technique is investigated. It combines In-line Recording Off-axis Viewing (IROV) holography with an Artificial Intelligence (AI) data processing system using Genetic Algorithm Particle Pairng (GAPP). The AI data processing lowers the restrictions on the holographic recording and reconstruction. IROV, furthermore, provides a holographic scheme to record 3D volumetric particle fields using low-cost equipment. In this work, different parameters of IROV configurations are studied for optimization. Moreover, an integrated hybrid automatic data processing system based on GAPP and correlation methods are developed. The complete system is used to study a traveling vortex.