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Reducing time interval between successive exposures in video PIV

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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.

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References

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Author notes

  1. H. T. Huang

    Present address: Dept. of Aerospace and Mechanical Engineering, The University of Arizona, 85721, Tucson, AZ, USA

Authors and Affiliations

  1. Hermann-Föttinger-Institut, TU-Berlin D-10623, Berlin, Germany

    H. T. Huang & H. E. Fiedler

Authors
  1. H. T. Huang
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  2. H. E. Fiedler
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Additional information

This work was supported by the Deutsche Forschungsgemeinschaft (DFG). The authors would like to thank Minami Yoda and Olaf Uhlig for the help in setting up the laser-scanner system.

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Huang, H.T., Fiedler, H.E. Reducing time interval between successive exposures in video PIV. Experiments in Fluids 17, 356–357 (1994). https://doi.org/10.1007/BF01874417

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  • DOI: https://doi.org/10.1007/BF01874417

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