Analysis of PIV interrogation with low-pixel resolution

Jerry Westerweel

doi:10.1117/12.163745

2 December 1993 Analysis of PIV interrogation with low-pixel resolution

Jerry Westerweel

Proceedings Volume 2005, Optical Diagnostics in Fluid and Thermal Flow; (1993) https://doi.org/10.1117/12.163745
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

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.

Citation Download Citation

Jerry Westerweel "Analysis of PIV interrogation with low-pixel resolution", Proc. SPIE 2005, Optical Diagnostics in Fluid and Thermal Flow, (2 December 1993); https://doi.org/10.1117/12.163745

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