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Applied Optics

Applied Optics


  • Vol. 41, Iss. 30 — Oct. 20, 2002
  • pp: 6420–6430

Laser-induced migration of oil particles suspended in a water matrix

Germán Da Costa, Juan Enrique Parra, and Felix Mosqueda  »View Author Affiliations

Applied Optics, Vol. 41, Issue 30, pp. 6420-6430 (2002)

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The thermoconvective flow induced in oil samples and oil-in-water emulsions by irradiation with a laser beam is studied experimentally. The samples are irradiated by He–Ne and CO2 lasers at different power levels. Time-resolved records of temperature and surface waves that propagate in a liquid surface are presented. In laser-heated emulsions the thermoconvective flow leads the dispersed oil droplets to the water-free surface where they agglomerate to form a floating oil layer. The reflected light beam is formed by a speckle pattern whose intensity and contrast show a spiking, quasi-periodic time variation. A theoretical model is proposed to explain this phenomenon.

© 2002 Optical Society of America

OCIS Codes
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(240.6690) Optics at surfaces : Surface waves
(290.5850) Scattering : Scattering, particles
(310.3840) Thin films : Materials and process characterization
(350.5340) Other areas of optics : Photothermal effects

Original Manuscript: November 5, 2001
Revised Manuscript: July 19, 2002
Published: October 20, 2002

Germán Da Costa, Juan Enrique Parra, and Felix Mosqueda, "Laser-induced migration of oil particles suspended in a water matrix," Appl. Opt. 41, 6420-6430 (2002)

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