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Sensors 2011, 11(1), 1-18; doi:10.3390/s110100001
Article

High Dynamic Velocity Range Particle Image Velocimetry Using Multiple Pulse Separation Imaging

1,2,*  and 3
Received: 12 October 2010 / Revised: 18 November 2010 / Accepted: 15 December 2010 / Published: 23 December 2010
(This article belongs to the Section Physical Sensors)
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Abstract

The dynamic velocity range of particle image velocimetry (PIV) is determined by the maximum and minimum resolvable particle displacement. Various techniques have extended the dynamic range, however flows with a wide velocity range (e.g., impinging jets) still challenge PIV algorithms. A new technique is presented to increase the dynamic velocity range by over an order of magnitude. The multiple pulse separation (MPS) technique (i) records series of double-frame exposures with different pulse separations, (ii) processes the fields using conventional multi-grid algorithms, and (iii) yields a composite velocity field with a locally optimized pulse separation. A robust criterion determines the local optimum pulse separation, accounting for correlation strength and measurement uncertainty. Validation experiments are performed in an impinging jet flow, using laser-Doppler velocimetry as reference measurement. The precision of mean flow and turbulence quantities is significantly improved compared to conventional PIV, due to the increase in dynamic range. In a wide range of applications, MPS PIV is a robust approach to increase the dynamic velocity range without restricting the vector evaluation methods.
Keywords: high dynamic range; velocity measurements; PIV; uncertainty analysis; impinging jet flow; laser-Doppler velocimetry high dynamic range; velocity measurements; PIV; uncertainty analysis; impinging jet flow; laser-Doppler velocimetry
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Persoons, T.; O’Donovan, T.S. High Dynamic Velocity Range Particle Image Velocimetry Using Multiple Pulse Separation Imaging. Sensors 2011, 11, 1-18.

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