Particle image velocimetry correlation signal-to-noise ratio metrics and measurement uncertainty quantification

TL;DR

This paper develops and validates new correlation signal-to-noise ratio metrics and models for quantifying measurement uncertainty in particle image velocimetry, improving accuracy and robustness of PIV data analysis.

Contribution

It introduces a comprehensive framework for evaluating correlation SNR metrics and models for uncertainty estimation, applicable to both standard and filtered correlations in PIV.

Findings

New SNR metrics effectively quantify correlation quality.

Uncertainty models provide accurate estimates at 68.5% and 95% confidence levels.

Models are validated against synthetic and experimental PIV data.

Abstract

In particle image velocimetry (PIV) the measurement signal is contained in the recorded intensity of the particle image pattern superimposed on a variety of noise sources. The signal-to-noise-ratio (SNR) strength governs the resulting PIV cross correlation and ultimately the accuracy and uncertainty of the resulting PIV measurement. Hence we posit that correlation SNR metrics calculated from the correlation plane can be used to quantify the quality of the correlation and the resulting uncertainty of an individual measurement. In this paper we present a framework for evaluating the correlation SNR using a set of different metrics, which in turn are used to develop models for uncertainty estimation. The SNR metrics and corresponding models presented herein are expanded to be applicable to both standard and filtered correlations. In addition, the notion of a valid measurement is redefined with respect to the correlation peak width in order to be consistent with uncertainty quantification principles and distinct from an outlier measurement. Finally the type and significance of the error distribution function is investigated. These advancements lead to robust uncertainty estimation models, which are tested against both synthetic benchmark data as well as actual experimental measurements. For all cases considered here, standard uncertainties are estimated at the 68.5% confidence level while expanded uncertainties are estimated at 95% confidence level. For all cases the resulting calculated coverage factors approximate the expected theoretical values thus demonstrating the applicability of these new models for estimation of uncertainty for individual PIV measurements.