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Proceedings Paper

Analysis of PIV interrogation with low-pixel resolution
Author(s): Jerry Westerweel
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Paper Abstract

The interrogation analysis of digital PlY images with low pixel resolution is investigated analytically. It is demonstrated that the minimum required sampling rate for PlY images is about 1/4 of the sampling rate that matches the optical bandwidth of PlY imaging optics; a further increase of the sampling rate does not improve the accuracy of the estimated image covariance. The accuracy of a centroiding ( "center-of-mass" ) estimator and a curve-fitting ( "Gaussian-fit" ) estimator for the particle-image displacement is evaluated. It appears that the estimated displacement is always biased, as a result of the fact that the image covariance is estimated from a finite number of samples. The proposed correction procedure adequately compensates for this bias. The predicted performance of the displacement estimators is in fair agreement with the results obtained from measurements of a linearly displaced test object.

Paper Details

Date Published: 2 December 1993
PDF: 12 pages
Proc. SPIE 2005, Optical Diagnostics in Fluid and Thermal Flow, (2 December 1993); doi: 10.1117/12.163745
Show Author Affiliations
Jerry Westerweel, Delft Univ. of Technology (Netherlands)

Published in SPIE Proceedings Vol. 2005:
Optical Diagnostics in Fluid and Thermal Flow
Soyoung Stephen Cha; James D. Trolinger, Editor(s)

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