Experiments in Fluids

, Volume 18, Issue 6, pp 421–428 | Cite as

On the accuracy of velocity and vorticity measurements with PIV

  • L. Lourenco
  • A. Krothapalli


A number of numerical techniques aimed at improving the accuracy of measurements using the correlation approach in Particle Image Velocimetry, PIV, are proposed and investigated. In this approach the velocity (displacement) is found as the location of a peak in the correlation map. Based on an experimental model the best performing peak finding approaches are selected among different strategies. Second, an algorithm is proposed which minimizes errors on the estimates of vorticity using velocity distributions obtained by means of PIV. The proposed methods are experimentally validated against a flow with known properties.


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  1. Adrian RJ (1988) Statistical properties of particle image velocimetry measurements in turbulent flow. In: Laser Anemometry in Fluid Mechanics, Vol. III, Springer Verlag, 115–129Google Scholar
  2. Adrian RJ;Yao CS (1984) Development of pulsed laser velocimetry (PLV) for measurement of turbulent flow. In: Proc Symp Turbl Rolla: Univ. Missouri, 170–186.Google Scholar
  3. Goodman JW (1968) Introduction to Fourier Optics. New York: McGraw-Hill. 287Google Scholar
  4. Keane RD;Adrian RJ (1989) Optimization of particle image velocimeters. In: Optical methods in flow and particle diagnostics. LIA Proc. Vol. 68, Orlando: Laser Inst Amer 141–161Google Scholar
  5. Lourenco L;Gogineni SP;LaSalle RT (1994) On-line particle image velocimeter: an integrated approach. Appl Opt 33: 2465–2470Google Scholar
  6. Lourenco L;Krothapalli A (1987) The role of photographic parameters in laser speckle or particle image displacement velocimetry. Exp Fluids 5: 29–32Google Scholar
  7. Lourenco L; Krothapalli A; Riethmuller ML; Buchlin JM (1986) A non-invasive experimental technique for the measurement of unsteady velocity and vorticity fields. AGARD-CP-413, 231–239Google Scholar
  8. Meynart R; Lourenco L (1984) Laser Speckle Velocimetry. von Karman Institute Lecture Series. Brussels, BelgiumGoogle Scholar
  9. Meynart R (1983) Speckle velocimetry study of vortex pairing in a low RE unexcited jet, Phys Fluids 26: 2074–2079CrossRefGoogle Scholar
  10. Stearns SD; Hush D (1990) Digital Signal Analysis. Second edition. Prentice Hall. 75–84Google Scholar

Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • L. Lourenco
    • 1
  • A. Krothapalli
    • 1
  1. 1.Fluid Mechanics Research Laboratory, FAMU/FSU College of EngineeringTallahasseeUSA

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