A novel Stereo PIV technique, with improvements over other techniques, is presented. The key feature of the new technique is the direct measurement of calibration data at each point in space on the measurement grid, so that no interpolation is necessary. This is achieved through the use of a contiguous target which can be analysed using standard PIV processing software. The technique results in three-dimensional measurements of high accuracy with a significantly simpler calibration phase. This has the benefit of improving ease of use and reducing the time taken to obtain data. Thorough error analysis shows that while previously-described error trends are correct, additional facets of the technique can be optimised to allow highly accurate results. The new technique is rigorously validated here using pure translation and rotation test cases. Finally, the technique is used to measure a complex swirling flow within a cylindrical vessel.
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Fouras, A., Dusting, J. & Hourigan, K. A simple calibration technique for stereoscopic particle image velocimetry. Exp Fluids 42, 799–810 (2007). https://doi.org/10.1007/s00348-007-0293-3
- Particle Image Velocimetry
- Stereo Particle Image Velocimetry
- Geometric Reconstruction
- Particle Image Velocimetry Processing
- Standard Particle Image Velocimetry