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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 11 — Apr. 10, 2007
  • pp: 2109–2118

Composition measurements of binary mixture droplets by rainbow refractometry

J. Wilms and B. Weigand  »View Author Affiliations


Applied Optics, Vol. 46, Issue 11, pp. 2109-2118 (2007)
http://dx.doi.org/10.1364/AO.46.002109


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Abstract

So far, refractive index measurements by rainbow refractometry have been used to determine the temperature of single droplets and ensembles of droplets. Rainbow refractometry is, for the first time, to the best of our knowledge, applied to measure composition histories of evaporating, binary mixture droplets. An evaluation method is presented that makes use of Airy theory and the simultaneous size measurement by Mie scattering imaging. The method further includes an empirical correction function for a certain diameter and refractive index range. The measurement uncertainty was investigated by numerical simulations with Lorenz–Mie theory. For the experiments, an optical levitation setup was used allowing for long measurement periods. Temperature measurements of single-component droplets at different temperature levels are shown to demonstrate the accuracy of rainbow refractometry. Measurements of size and composition histories of binary mixture droplets are presented for two different mixtures. Experimental results show good agreement with numerical results using a rapid-mixing model.

© 2007 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
(120.6780) Instrumentation, measurement, and metrology : Temperature
(290.0290) Scattering : Scattering

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: September 12, 2006
Manuscript Accepted: November 6, 2006
Published: March 20, 2007

Citation
J. Wilms and B. Weigand, "Composition measurements of binary mixture droplets by rainbow refractometry," Appl. Opt. 46, 2109-2118 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-11-2109


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