Limitations of accuracy in PIV due to individual variations of particle image intensities
Nobach, H.; Bodenschatz, E.
Bericht 2007/1, Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany, 2007
The effect of individual tracer particle intensity variations in consecutive images on the accuracy of the displacement estimates in particle image velocimetry is investigated. Particularly, the efficacy of Gaussian low-pass filter image interpolation for the reduction of under-sampling, the normalization of the correlation estimates for reduction of truncation errors, and interrogation area weighting schemes for improved spatial resolution are studied. The achievable accuracy of PIV measurements is shown to be limited by this effect to approximately 0.1 pixels.
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