Dual-plane PIV

Apart from the abovementioned PIV techniques, there are still some other PIV systems designed for the particular purposes. Among them, the time-resolved or dynamic PIV, high-speed scanning PIV, dual-plane PIV, and simultaneous orthogonal-plane PIV are briefly introduced as follows. 

The orthogonal-plane PIV technique is recently proposed for investigating the 3D characteristics of the coherent structures in a turbulent boundary layer flow (Hambleton et al., 2006 Kim et al., 2006). The hardware components and principle of this technique are the same as polarization-based dual-plane PIV. The only difference is to set up both laser sheets mutually perpendicular to each other instead of parallel to each other in the dual-plane PIV system. This allows for measuring velocity distributions in both streamwise-spanwise and streamwise-wall-normal planes simultaneously, so that the salient features of the coherent structures in a turbulent boundary layer flow as the legs and the head of the hairpin vortices can be detected (Hambleton et al., 2006 Kim et al., 2006). 

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