Generalization of the PIV loss-of-correlation formula introduced by Keane and Adrian

Abstract

In 2D particle image velocimetry (PIV), the loss-of-correlation due to out-of-plane motion or light-sheet mismatch has two effects. First, it reduces the probability of detecting a valid vector. Second, it increases the uncertainty measured in velocity fields. The loss-of-correlation is commonly determined by the FO factor, which was initially proposed by Keane and Adrian (Appl Sci Res 49:191–215, 1992). However, the present study demonstrates that the validity of the original FO definition is confined to cases with identical laser intensity profiles. As light sheets usually differ in width and shape, the proposed definition is of limited use in reality. To overcome this restriction, a new d..