Search

Laser light sheet refraction at the fluid flow/window interface is proposed to proceed fluorescent PIV measurements, in particular for cases for which optical access limits the possibilities of illuminating a flow with a planar collimated light sheet. The study of the laser sheet propagation for the present measurement method is led with ray tracing to quantify the illumination intensity. To describe the limitations of this developed PIV version (the R-PIV), we proposed a cross-correlation model (CCM) for analysing image pairs and that is an extension of the ones used in the cases of $\mu$-PIV or P-PIV techniques. This cross-correlation model accounts for the R-PIV optical constraints as 1) in-depth and longitudinal inhomogeneities of the light sheet refraction at the location of the object plane or 2) integration in depth of the fluorescence from seeding particles. This refracted PIV (R-PIV) and the P-PIV techniques are further compared in the case of an academic pipe flow whose analytic solution is known. Our extended cross-correlation model function is finally applied, knowing the theoretical flow velocity, the flow illumination and the seeding flow parameters, to analyse some error levels in determining the real flow velocity field., Comment: 40 pages, 27 figures. This is the version of the article before peer review or editing, as submitted by an author to Measurement Science and Technology. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it