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Visualization of laser-induced liquid micro-jet disintegration by means of high-speed video stroboscope

Stasicki, Boleslaw und Abel, B. und Charvat, A. und Faubel, M. (2004) Visualization of laser-induced liquid micro-jet disintegration by means of high-speed video stroboscope. In: 26th International Congress on High-Speed Photography and Photonics. 26th International Congress on High-Speed Photography and Photonics, 2004-09-19 - 2004-09-24, Alexandria, Virginia (USA).

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Kurzfassung

In the present paper we describe a novel approach to monitor and to investigate laser induced liquid water jet disintegration in air and in vacuum. The features of liquid beam disintegration in vacuum are of importance for pulsed laser induced liquid beam desorption mass spectrometry and micro-calorimetry. Due to the small liquid beam diameter of 12-15 µm, its high speed of 50-100 m/s, and a total event duration of a less than a few microseconds only, the microscopic visualization of the jet disintegration was a challenging task. Good quality video sequences have been recorded with a high-speed video stroboscope system running in the back illumination mode. The light pulses were synchronized carefully with the shutter circuit of the stroboscope camera and the IR-laser pulses. With a continuously changing time delay between the desorption laser pulses and the shutter opening a slow-motion effect has been achieved. The delay was changed in steps of 25 ns which corresponds to an equivalent framing speed of about 40,000,000 fps. With a high-brightness light emitting diode (LED) as a light source an exposure time of about 200 ns an effective time resolution of several hundred nanoseconds could be achieved. Using a pulsed Nd:YAG laser instead, the exposure time and time resolution could be reduced down to about 10 ns and 25 ns, respectively. Due to the well known speckle problem when using coherent light sources for illumination we have finally used a Nd:YAG laser excited dye solution of Rhodamine 6G (10-3 M) in methanol solution in a quartz cuvette placed in front of the liquid beam keeping the short exposure time of about 10 ns. In this nearly speckle free visualization mode the real-time slow-motion imaging of the jet disintegration and the study of the desorption process has been made possible with a time resolution of 25 ns (currently limited by the phase shifter steps) and an exposure time of ~10 ns only. It has been found that the laser induced desorption is so fast that the measurement in the gas phase represents a “snapshot” of the situation (structure, complexation, interaction) in solution. The new desorption technique enables very promising studies of the function, structure and interaction of biopolymers in their natural environment.

Dokumentart:Konferenzbeitrag (Vortrag)
Zusätzliche Informationen: LIDO-Berichtsjahr=2004, monograph_id=Session 9,
Titel:Visualization of laser-induced liquid micro-jet disintegration by means of high-speed video stroboscope
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Stasicki, BoleslawNICHT SPEZIFIZIERT
Abel, B.Universität Göttingen
Charvat, A.Max-Planck-Institut für Biophysikalische Chemie
Faubel, M.Max-Planck-Institut für Strömungsforschung
Datum:2004
Erschienen in:26th International Congress on High-Speed Photography and Photonics
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
Thompso, NICHT SPEZIFIZIERT
Status:veröffentlicht
Stichwörter:High-speed stroboscopy, liquid water micro-jet disintegration, liquid beam desorption mass spectrometry, biopolymers
Veranstaltungstitel:26th International Congress on High-Speed Photography and Photonics
Veranstaltungsort:Alexandria, Virginia (USA)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2004-09-19 - 2004-09-24
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugphysik
Standort: Köln-Porz , Braunschweig , Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik
Hinterlegt von: Ilka Micknaus
Hinterlegt am:15 Feb 2006
Letzte Änderung:27 Apr 2009 05:00

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