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Velocimetry of fast microscopic liquid jets by nanosecond dual-pulse laser illumination for megahertz X-ray free-electron lasers

MPG-Autoren
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Grünbein,  Marie Luise
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;

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Shoeman,  Robert L.
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;

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Doak,  Bruce
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;

Externe Ressourcen

https://www.osapublishing.org/oe/viewmedia.cfm?uri=oe-26-6-7190&seq=0
(beliebiger Volltext)

https://doi.org/10.1364/OE.26.007190
(beliebiger Volltext)

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Zitation

Grünbein, M. L., Shoeman, R. L., & Doak, B. (2018). Velocimetry of fast microscopic liquid jets by nanosecond dual-pulse laser illumination for megahertz X-ray free-electron lasers. Optics Express, 26(6), 7190-7203. doi:10.1364/OE.26.007190.


Zitierlink: https://hdl.handle.net/21.11116/0000-0001-1CBF-A
Zusammenfassung
To conduct X-ray Free-Electron Laser (XFEL) measurements at megahertz (MHz) repetition rates, sample solution must be delivered in a micron-sized liquid free-jet moving at up to 100 m/s. This exceeds by over a factor of two the jet speeds measurable with current high-speed camera techniques. Accordingly we have developed and describe herein an alternative jet velocimetry based on dual-pulse nanosecond laser illumination. Three separate implementations are described, including a small laser-diode system that is inexpensive and highly portable. We have also developed and describe analysis techniques to automatically and rapidly extract jet speed from dual-pulse images.