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Experiments in Fluids

, Volume 17, Issue 5, pp 356–357 | Cite as

Reducing time interval between successive exposures in video PIV

  • H. T. Huang
  • H. E. Fiedler
Technical notes

Abstract

Video PIV (VPIV) is an inexpensive and simple technique for measuring instantaneous velocity fields. Because of the low video framing rate its application is, however, limited to flows with small velocity gradients. In this note a method to reduce the time interval Δt between successive exposures by means of an external hardware synchronized with the video camera is described. These exposures with shorter time interval are recorded in separate video fields. The cross-correlation technique can be used therefore, eliminating directional ambiguity and enabling the application of PID (Particle Image Distortion), which improves the accuracy of velocity detections.

Keywords

Velocity Field Short Time Interval Velocity Gradient Particle Image Instantaneous Velocity 
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.

References

  1. Adrian RJ (1991) Particle-imaging techniques for experimental fluids mechanics. Ann Rev Fluid Mech 23: 261–304Google Scholar
  2. Huang HT; Fiedler HE; Wang JJ (1993) Limitation and improvement of PIV, part I: limitation of PIV due to velocity gradients. Exp Fluids 15: 168–174Google Scholar
  3. Huang HT; Fiedler HE; Wang JJ (1993) Limitation and improvement of PIV, part II: particle image distortion - a novel technique. Exp Fluids 15: 263–273Google Scholar
  4. Nieuwstadt FTM editor (1993) Flow Visualization and Image Analysis. Kluwer Academic PublishersGoogle Scholar
  5. Westerweel J; Flõr JB; Nieuwstadt FTM (1990) Measurement of dynamics of coherent flow structures using particle image velocimetry. In: RJ Adrian et al., editors, Applications of a Laser Techniques in Fluid Mechanics. Springer-VerlagGoogle Scholar
  6. Willert CE; Gharib M (1991) Digital particle image velocimetry. Exp Fluids 10: 181–193Google Scholar

Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • H. T. Huang
    • 1
  • H. E. Fiedler
    • 1
  1. 1.Hermann-Föttinger-InstitutBerlinGermany

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