%0 Journal Article
%T High Dynamic Velocity Range Particle Image Velocimetry Using Multiple Pulse Separation Imaging
%A Tim Persoons
%A Tadhg S. O¡¯Donovan
%J Sensors
%D 2011
%I MDPI AG
%R 10.3390/s110100001
%X The dynamic velocity range of particle image velocimetry (PIV) is determined by the maximum and minimum resolvable particle displacement. Various techniques have extended the dynamic range, however flows with a wide velocity range (e.g., impinging jets) still challenge PIV algorithms. A new technique is presented to increase the dynamic velocity range by over an order of magnitude. The multiple pulse separation (MPS) technique (i) records series of double-frame exposures with different pulse separations, (ii) processes the fields using conventional multi-grid algorithms, and (iii) yields a composite velocity field with a locally optimized pulse separation. A robust criterion determines the local optimum pulse separation, accounting for correlation strength and measurement uncertainty. Validation experiments are performed in an impinging jet flow, using laser-Doppler velocimetry as reference measurement. The precision of mean flow and turbulence quantities is significantly improved compared to conventional PIV, due to the increase in dynamic range. In a wide range of applications, MPS PIV is a robust approach to increase the dynamic velocity range without restricting the vector evaluation methods.
%K high dynamic range
%K velocity measurements
%K PIV
%K uncertainty analysis
%K impinging jet flow
%K laser-Doppler velocimetry
%U http://www.mdpi.com/1424-8220/11/1/1