The effect of a discrete window offset on the accuracy of cross-correlation analysis of digital PIV recordings |
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Authors: | J Westerweel D Dabiri M Gharib |
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Institution: | (1) Laboratory for Aero & Hydrodynamics, Delft University of Technology, NL-2628 AL Delft, The Netherlands, NL;(2) Center for Quantitative Visualization, California Institute of Technology, Pasadena, CA 91125, USA, US |
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Abstract: | This paper describes how the accuracy for estimating the location of the displacement-correlation peak in (digital) particle
image velocimetry (PIV) can be optimized by the use of a window offset equal to the integer-pixel displacement. The method
works for both cross-correlation analysis of single-exposure image pairs and multiple-exposure images. The effect is predicted
by an analytical model for the statistical properties of estimators for the displacement, and it is observed in the analysis
of synthetic PIV images of isotropic turbulence, and in actual measurements of grid-generated turbulence and of fully-developed
turbulent pipe flow.
Received: 29 April 1996/Accepted: 29 October 1996 |
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