Reducing time interval between successive exposures in video PIV

Video particle image velocimetry (VPIV) is an inexpensive and simple technique for measuring instantaneous velocity fields. Because of the low video flaming rate its application is, however, limited to flows with small velocity gradients. In this note a method to reduce the time interval between suc...

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Veröffentlicht in:Experiments in fluids 1994-09, Vol.17 (5), p.356-357
Hauptverfasser: Huang, H. T., Fiedler, H. E.
Format: Artikel
Sprache:eng
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Zusammenfassung:Video particle image velocimetry (VPIV) is an inexpensive and simple technique for measuring instantaneous velocity fields. Because of the low video flaming rate its application is, however, limited to flows with small velocity gradients. In this note a method to reduce the time interval between successive exposures by means of 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 therefore be used, eliminating directional ambiguity and enabling the application of PID (Particle Image Distortion), which improves the accuracy of velocity detections. (Author)
ISSN:0723-4864
1432-1114
DOI:10.1007/BF01874417