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A calibration procedure for millimeter-scale stereomicroscopic particle image velocimetry

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Abstract

A stereomicroscopic particle image velocimetry (SμPIV) system has been developed for millimeter scale flows. The SμPIV system is based on an off-the-shelf stereomicroscope, with magnification between 0.69× and 30×, and a field of view between 7.5 × 6 mm and 250 × 200 μm. Custom calibration targets were devised using printed circuit board technology, and applied at a magnification factor of 1.74, with a field of view of 4.75 × 3.8 mm. Measurement errors were assessed by moving a test block with fixed particles. Total system uncertainty in test block displacement transverse to the optical axis was 0.5% of the field of view, and 3% of the depth of field for motion along the optical axis. Approximately 20% of this uncertainty was due to the calibration target quality and test block procedures.

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Acknowledgments

This material is based upon work supported by the National Science Foundation under Awards No. 0114109 and 0083004. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author and do not necessarily reflect the views of the National Science Foundation (NSF). This work complies with the current laws of the United States of America.

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Authors and Affiliations

  1. UCB 427, University of Colorado, Boulder, CO, 80309-0427, USA

    John Giardino

  2. Department of Mechanical Engineering, University of Colorado, Boulder, CO, USA

    Jean Hertzberg

  3. Department of Computer Science, University of Colorado, Boulder, CO, USA

    Elizabeth Bradley

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  1. John Giardino
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  2. Jean Hertzberg
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  3. Elizabeth Bradley
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Correspondence to Jean Hertzberg.

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Giardino, J., Hertzberg, J. & Bradley, E. A calibration procedure for millimeter-scale stereomicroscopic particle image velocimetry. Exp Fluids 45, 1037–1045 (2008). https://doi.org/10.1007/s00348-008-0525-1

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  • DOI: https://doi.org/10.1007/s00348-008-0525-1

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