A calibration procedure for millimeter-scale stereomicroscopic particle image velocimetry |
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Authors: | John Giardino Jean Hertzberg Elizabeth Bradley |
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Institution: | (1) UCB 427, University of Colorado, Boulder, CO 80309-0427, USA;(2) Department of Mechanical Engineering, University of Colorado, Boulder, CO, USA;(3) Department of Computer Science, University of Colorado, Boulder, CO, USA |
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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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Keywords: | |
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