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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 5, Iss. 1 — Jan. 4, 2010

Robust sensor for turbidity measurement from light scattering and absorbing liquids

Ville Kontturi, Petri Turunen, Jun Uozumi, and Kai-Erik Peiponen  »View Author Affiliations


Optics Letters, Vol. 34, Issue 23, pp. 3743-3745 (2009)
http://dx.doi.org/10.1364/OL.34.003743


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Abstract

Internationally standardized turbidity measurements for probing solid particles in liquid are problematic in the case of simultaneous light scattering and absorption. A method and a sensor to determine the turbidity in the presence of light absorption are presented. The developed sensor makes use of the total internal reflection of a laser beam at the liquid–prism interface, and the turbidity is assessed using the concept of laser speckle pattern. Using average filtering in speckle data analyzing the observed dynamic speckle pattern, which is due to light scattering from particles and the static speckle due to stray light of the sensor, can be separated from each other. Good correlation between the standard deviation of dynamic speckle and turbidity value for nonabsorbing and for absorbing liquids was observed. The sensor is suggested, for instance, for the measurement of ill-behaved as well as small-volume turbid liquids in both medicine and process industry.

© 2009 Optical Society of America

OCIS Codes
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
(120.6150) Instrumentation, measurement, and metrology : Speckle imaging
(230.5480) Optical devices : Prisms
(290.5820) Scattering : Scattering measurements
(290.7050) Scattering : Turbid media

ToC Category:
Scattering

History
Original Manuscript: August 4, 2009
Revised Manuscript: October 28, 2009
Manuscript Accepted: November 5, 2009
Published: November 30, 2009

Virtual Issues
Vol. 5, Iss. 1 Virtual Journal for Biomedical Optics

Citation
Ville Kontturi, Petri Turunen, Jun Uozumi, and Kai-Erik Peiponen, "Robust sensor for turbidity measurement from light scattering and absorbing liquids," Opt. Lett. 34, 3743-3745 (2009)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ol-34-23-3743

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