Effect of resolution on the speed and accuracy of particle image velocimetry interrogations

A. K. Prasad, Ronald Adrian, C. C. Landreth, P. W. Offutt

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


Particle image velocimetry has traditionally incorporated a process by which a photograph of a flow field, bearing double images of seeding particles, is analyzed in small regions called 'interrogation spots.' Each spot is imaged onto a photodetector and converted into a mathematical array, which is evaluated computationally using the auto-correlation technique. Typically, the interrogation spot is resolved into a 256 × 256 array. This paper describes an effort to resolve the spot using arrays of reduced resolution, motivated primarily by a gain in speed. For this purpose, two specially created test-photographs representing (i) uniform flow, and (ii) solid-body rotation, were interrogated using array-sizes of 128 × 128, 64 × 64, and 32 × 32, and the results were compared with the standard resolution of 256 × 256. While a reduction in resolution by a factor of two affords a gain of four in interrogation speed, this benefit is obviously countered by a loss of accuracy. The results presented focus on the accuracy of the various resolutions, based on which an appropriate resolution may be selected.

Original languageEnglish (US)
Title of host publicationPreprints for the Symposium on Turbulence
EditorsX.B.Jr. Reed, G.K. Patterson, J.L. Zakin
Place of PublicationRolla, MO, United States
PublisherPubl by Univ of Missouri
StatePublished - 1990
Externally publishedYes
EventTwelfth Turbulence Symposium - Rolla, MS, USA
Duration: Sep 24 1990Sep 26 1990


OtherTwelfth Turbulence Symposium
CityRolla, MS, USA

ASJC Scopus subject areas

  • General Engineering


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