The effect of flow turbulence and interrogating beam profile on particle image velocimetry fringes

I. Grant, E. H. Owens, G. H. Smith

Research output: Contribution to journalArticle

Abstract

Particle image velocimetry (PIV) and its advantages in fluid flow applications are discussed. The adoption and application of classical speckle metrological analysis techniques in PIV are described. An optical transform method for image analysis is outlined and the effect of the flow turbulence on the visibility of the resulting interference fringes demonstrated. Changes in visibility of the fringes due to the interrogating beam profile and particle image size distribution are discussed. Consideration is given to the likely accuracy of turbulence estimates obtained from fringe visibility measurements by comparing fringes obtained from a digital flow simulation with the corresponding analytically predicted interference pattern. © 1989.

Original languageEnglish
Pages (from-to)115-128
Number of pages14
JournalOptics and Lasers in Engineering
Volume11
Issue number2
Publication statusPublished - 1989

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