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Published May 1997 | public
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The effect of a discrete window offset on the accuracy of cross-correlation analysis of digital PIV recordings

Westerweel, J.
Dabiri, D.
Gharib, M. ORCID icon
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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.

Additional Information

© 1997 Springer-Verlag. Received: 29 April 1996; Accepted: 29 October 1996. A version of this paper was presented at the 7th International Symposium on Flow Visualization, Seattle, WA, USA, September 1995 The research of dr.ir. J. Westerweel has been made possible by a fellowship of the Royal Netherlands Academy of Arts and Sciences. The visit of dr.ir. J. Westerweel to the C.Q.V. was supported by URI(N00014-92-J-1618) from the Office of Naval Research. The authors would like to thank dr. M. Raffel for its comments and suggestions with respect to certain parts of the original manuscript.

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