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The V3V-CAL is a calibration system for the TSI V3V Volumetric PIV systems (V3V-Flex and V3V-9000 frame). The purpose of calibration, is to establish a mapping function to relate the particle images captured by the multiple cameras (2D image in each camera) in the volumetric PIV system, to the particle locations in the volumetric 3D space. Such calibration is critical for the reconstruction of particles in volume, and to obtain the velocity vector field in the volume.