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Experiments in Fluids

, Volume 28, Issue 5, pp 436–447 | Cite as

Bias and precision errors of digital particle image velocimetry

  • D. J. Forliti
  • P. J. Strykowski
  • K. Debatin

Abstract

The bias and precision errors of digital particle image velocimetry are quantified. Uniform displacement images are used to evaluate the uncertainty attributed to various sub-pixel peak finding algorithms. Bias errors are found to exist for all algorithms, and the presence of bias error tends to affect the precision error. The ability to “calibrate” out the bias error is explored using a rectangular free jet experiment. The calibration was effective in removing the bias error in the potential core and less effective in the shear layer. The bias error is found to functionally depend on the displacement gradients present in the interrogation region. The study stresses the need for in situ quantification of DPIV uncertainty.

Keywords

Particle Image Velocimetry Shear Layer Particle Image Velocimetry Potential Core 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • D. J. Forliti
    • 1
  • P. J. Strykowski
    • 1
  • K. Debatin
    • 2
  1. 1.Department of Mechanical Engineering University of Minnesota Minneapolis, Minnesota 55455, USAUS
  2. 2.Institute for Fluid Mechanics University of Karlsruhe 76128 Karlsruhe, GermanyDE

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