Experimental and numerical investigation on the accuracy of phosphor particle streak velocimetry

A new phosphor particle streak velocimetry (phosphor-PSV) diagnostic with high spatial resolution was recently demonstrated (Fan et al. in Opt Lett 46:641, 2021), where individual particles, excited by a short pulse laser, form streaks as results of their displacement the flow during relatively long luminescence decay. The local velocity is derived fitting each two-dimensional linearly-moving point source mono-exponential decaying emission. This single-pulse, single-exposure technique yields vector for particle, tracking velocimetry, avoiding filtering associated image (PIV). wavelength-shifted also allows rejection unwanted reflected laser light, and macroscopic measurements Fan (Opt 2021) were obtained at distance 30 $$\upmu$$ m from wall. In this manuscript, we establish combination experiments luminescent imaging simulations performance range conditions parameters. segmentation algorithm developed applied to images improve density 0.004 vectors per pixel (vpp). Two phosphors decay times 564.2 s ( $$\hbox {Gd}_2\,\hbox {O}_2$$ S: {Tb}^{3+}$$ ) 0.92 {BaMgAl}_{10}\,\hbox {O}_{17}$$ : {Eu}^{2+}$$ ), are used perform slow liquid flows $$< 20$$ cm/s) fast turbulent jets (up 85 m/s), respectively. To assess uncertainty approach various experimental parameters (phosphor velocity, size, signal-to-noise ratio, streamline curvature), synthetic generated validated against data. Finally, impact out-of-plane motion investigated experimentally. study paves way wide implementation phosphor-PSV research and, particular, two-phase confined or semi-confined near solid boundaries.