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


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.


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.


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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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