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Issue 4, 2004
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Laser techniques in acoustically levitated micro droplets

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Laser techniques were applied to an acoustically levitated droplet for remote investigation of the diameter, species concentration and temperature of the suspended droplet. To this end, the third and the fourth harmonic of a Nd:YAG laser were used for investigation of elastic, fluorescence and phosphorescence signals from the droplet. The droplet was seeded with thermographic phosphors and acetone for the phosphorescence and fluorescence measurements, respectively. The techniques were applied simultaneously using an imaging stereoscope. The imaging device allowed for an identical visualization of incoming signal through separate optical filters. Temperature measurements in droplets is important in the study of e.g. exothermic chemical reactions, spray processes, combustion, and in bioanalytical applications where the biological material is temperature sensitive or dependent on optimal temperature for function. Results from these investigations showed that temperature measurements in acoustically levitated droplets using laser-induced phosphorescence are feasible. The results also show the potential of simultaneous laser based measurements on levitated droplets. Diameter variation (surface area), mixture concentration and temperature were measured simultaneously.

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Publication details

The article was received on 17 Feb 2004, accepted on 07 Apr 2004 and first published on 06 May 2004

Article type: Paper
DOI: 10.1039/B402440K
Citation: Lab Chip, 2004,4, 287-291
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    Laser techniques in acoustically levitated micro droplets

    A. Omrane, S. Santesson, M. Aldén and S. Nilsson, Lab Chip, 2004, 4, 287
    DOI: 10.1039/B402440K

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