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

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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.

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Acknowledgements

This work was funded by Sandia Engineering Sciences Research Foundation. Sandia is a multi-program laboratory operated by Lockheed-Martin Company, for the United States Department of Energy under contract DE-AC04094AL85000. The work is also funded by the National Science Foundation under grant number CTS-0134469.

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Authors and Affiliations

  1. Experimental Thermal, Fluids, and Aero Sciences, Engineering Sciences Center, Sandia National Labs, PO Box 5800, MS 0834, Albuquerque, NM, 87145, USA

    C. J. Bourdon & A. D. Gorby

  2. Department of Mechanical Engineering, Iowa State University, 3025 H. M. Black Engineering Building, Ames, IA, 50011, USA

    M. G. Olsen

Authors
  1. C. J. Bourdon
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  2. M. G. Olsen
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  3. A. D. Gorby
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Correspondence to C. J. Bourdon.

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Bourdon, C.J., Olsen, M.G. & Gorby, A.D. Power-filter technique for modifying depth of correlation in microPIV experiments. Exp Fluids 37, 263–271 (2004). https://doi.org/10.1007/s00348-004-0812-4

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  • DOI: https://doi.org/10.1007/s00348-004-0812-4

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