Dual-color planar scanning PIV system with color crosstalk correction

A cost-effective dual-color scanning PIV system is developed, experimentally demonstrated, and validated. The scanning PIV system has two CW DPSS lasers of different wavelengths (green: 532 nm and blue: 473 nm), which sweep through the region of interest to provide illumination. The illuminated region is captured by a conventional DSLR camera. Two different color lasers produce two illuminations, which are captured on a single frame. The single-frame color recording causes the phenomenon of color crosstalk, which is the leakage of light to neighboring pixels on the imaging sensor. Due to the color crosstalk, some unwanted particle images are observed in different color channels, referred to as ghost particles. This leads to inaccurate velocity measurements, and to mitigate the color crosstalk from images, a correction algorithm is proposed in this study. The captured images are corrected using the color crosstalk correction algorithm and processed further to obtain the velocity field. The scanning PIV system is tested by measuring the flow field downstream of a moving circular cylinder, and validated by measuring steady vortex flow generated using a magnetic stirrer. The applicability of the proposed scanning PIV system is also discussed.