Experiments in Fluids

, Volume 37, Issue 2, pp 263–271

Power-filter technique for modifying depth of correlation in microPIV experiments

Original

Abstract

A new image filtering method, termed power-filtering, is proposed for use in microscopic particle image velocimetry (PIV) to control the depth of correlation, independent of the image acquisition system, particle size, and flow characteristics. An analytical model of the depth of correlation for the filtered images is developed and verified with a series of careful experiments. This model predicts that the depth of correlation can be increased or decreased by a factor of two by applying power-filter values of 0.63 and 2.0, respectively. Experiments show that the analytical model for the power filtering technique is generally accurate to within the measurement uncertainty.

References

  1. Adrian RJ, Yao CS (1985) Pulsed laser technique application to liquid and gaseous flows and the power of seed materials. Appl Opt 24:42–52Google Scholar
  2. Born M, Wolf E (1999) Principles of optics. Cambridge University Press, Cambridge, UKGoogle Scholar
  3. Bourdon CJ, Olsen MG, Gorby AD (2004) Validation of analytical solution for depth-of-correlation in microscopic particle-image velocimetry. Meas Sci Technol 15:318–327CrossRefGoogle Scholar
  4. Hecht E (1998) Optics. Addison Wesley, New YorkGoogle Scholar
  5. Meinhart CD, Zhang H (2000) The flow structure inside a microfabricated inkjet printhead. J Microelectromech Sys 9:67–75CrossRefGoogle Scholar
  6. Meinhart CD, Wereley ST, Santiago JG (1999). PIV measurements of a microchannel flow. Exp Fluids 27:414–419CrossRefGoogle Scholar
  7. Meinhart CD, Wereley ST, Gray HB (2000a) Volume illumination for two-dimensional particle image velocimetry. Meas Sci Tech 11:809–814Google Scholar
  8. Meinhart CD, Wereley ST, Santiago JG (2000b) A PIV algorithm for estimating time-averaged velocity fields. J Fluid Eng–T ASME 122:285–289Google Scholar
  9. Olsen MG, Adrian RJ (2000a) Brownian motion effects in microscopic particle image velocimetry. Opt Laser Technol 32:621–627CrossRefGoogle Scholar
  10. Olsen MG, Adrian RJ (2000b) Out-of-focus effects on particle image visibility and correlation in microscopic particle image velocimetry. Exp Fluids S166-S174Google Scholar
  11. Olsen MG, Bourdon CJ (2003) Out-of-plane motion effects in microscopic particle image velocimetry. J Fluids Eng 125:895–901CrossRefGoogle Scholar
  12. Santiago JG, Wereley ST, Meinhart CD, Beebe DJ, Adrian RJ. (1998) A particle image velocimetry system for microfluidics. Exp Fluids 25:316–319Google Scholar
  13. Tretheway DC, Meinhart CD (2002) Apparent fluid slip at hydrophobic microchannel walls. Phys Fluids 14:L9-L12CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  1. 1.Experimental Thermal, Fluids, and Aero Sciences, Engineering Sciences CenterSandia National LabsAlbuquerqueUSA
  2. 2.Department of Mechanical EngineeringIowa State UniversityAmesUSA

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