Corpus ID: 55562271

Pulsed Operation of High Power Light Emitting Diodes for Flow Velocimetry

@inproceedings{Willert2009PulsedOO,
  title={Pulsed Operation of High Power Light Emitting Diodes for Flow Velocimetry},
  author={Christian E. Willert and Steffen Moessner and Joachim Klinner},
  year={2009}
}
High powered light emitting diodes (LED) are investigated for possible uses as light sources in flow diagnostics, in particular, as an alternative to laser-based illumination in particle imaging flow velocimetry. Recent developments in solid state illumination resulted in mass-produced LEDs that provide average radiant power in excess of 10 Watt. By operating these LEDs with short duration, pulsed currents that are considerably beyond their continuous current damage threshold, light pulses can… Expand
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References

SHOWING 1-10 OF 12 REFERENCES
A pulsed light generator for high speed photography
A pulsed light generator for stroboscopic photography which makes use of LED's has been developed. The maximum light power which may be extracted from a single LED is approximately 1 Watt. The pulse… Expand
A pulsed LED system for schlieren flow visualisation
Schlieren flow visualisation can be performed using light emitting diodes (LEDs) operated with a strong pulse of current (typically a few amps can be passed through the LED for a number of… Expand
High speed imaging of fuel sprays using a low-cost illumination source
The recent availability of (affordable) high frame rate electronic imaging with large frame counts now allows for parametric, time-resolved investigations of the liquid break-up processes that… Expand
Miniature particle image velocimetry system with LED in-line illumination
For two decades, there has been active research to enhance the performance of particle image velocimetry (PIV) systems. However, the resulting systems are rather costly, cumbersome and delicate. In… Expand
Simultaneous PIV and pulsed shadow technique in slug flow: a solution for optical problems
A recent technique of simultaneous particle image velocimetry (PIV) and pulsed shadow technique (PST) measurements, using only one black and white CCD camera, is successfully applied to the study of… Expand
Planar shadow image velocimetry for the analysis of the hydrodynamics in bubbly flows
In order to allow for more reliable modelling of microscale processes in turbulent bubbly flows, detailed experiments in a laboratory-scale double loop facility and a bubble column with a diameter of… Expand
Investigations on LED illumination for micro-PIV including a novel front-lit configuration
In this study, we provide a general investigation on micro-PIV with LED illumination. A number of improvements over previous LED-based systems are suggested, in particular, we present a novel… Expand
A novel PIV technique for measurements in multiphase flows and its application to two-phase bubbly flows
Abstract. A new experimental procedure for performing simultaneous, phase-separated velocity measurements in two-phase flows is introduced. Basically, the novel particle image velocimetry (PIV)… Expand
Fundamental of Photonics (John Wiley & Sons, Hoboken New Jersey, 2007), 2 edn., ISBN 978-0-471-35832-9
  • 2007
PIV with LED: Particle Shadow Velocimetry (PSV) Technique
...
1
2
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