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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
1 Mechanical Engineering Department, Parsons Building, Trinity College, Dublin 2, Ireland 2 School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette, IN 47907, USA 3 School of Engineering and Physical Sciences, Nasmyth Building, Heriot-Watt University, Edinburgh EH14 4AS, UK
* Author to whom correspondence should be addressed.
Received: 12 October 2010 / Revised: 18 November 2010 / Accepted: 15 December 2010 / Published: 23 December 2010
(This article belongs to the Section Chemical 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 (CC BY 3.0).
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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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