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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 3 — Feb. 6, 2006
  • pp: 1044–1054

Quick and easy measurement of particle size of Brownian particles and plankton in water using a self-mixing laser

Seiichi Sudo, Yoshihiko Miyasaka, Kenju Otsuka, Yohei Takahashi, Tomohiko Oishi, and Jing-Yuan Ko  »View Author Affiliations


Optics Express, Vol. 14, Issue 3, pp. 1044-1054 (2006)
http://dx.doi.org/10.1364/OE.14.001044


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Abstract

We describe a method for quickly and easily measuring the size of small particles in suspensions. This method uses a self-mixing laser Doppler measurement with a laser-diode-pumped, thin-slice LiNdP4O12 laser with extremely high optical sensitivity. The average size of the particles in Brownian motion is determined by a Lorentz fitting of the measured power spectrum of the modulated self-mixing laser light resulting from the motion. The dependence of the measured power spectra on particle size and concentration was quantitatively identified from the results of a systematic investigation of small polystyrene latex particles with different diameters and concentrations. The sizes and ratios of particles with different diameters mixed in water were accurately measured. An application of this self-mixing laser method for estimation of the average size of plankton in seawater showed that it is a practical method for characterizing biological species.

© 2006 Optical Society of America

OCIS Codes
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
(140.3580) Lasers and laser optics : Lasers, solid-state
(160.5470) Materials : Polymers
(170.1420) Medical optics and biotechnology : Biology
(290.1350) Scattering : Backscattering
(290.4020) Scattering : Mie theory

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: October 3, 2005
Revised Manuscript: December 16, 2005
Manuscript Accepted: December 17, 2005
Published: February 6, 2006

Virtual Issues
Vol. 1, Iss. 3 Virtual Journal for Biomedical Optics

Citation
Seiichi Sudol, Yoshihiko Miyasaka, Kenju Otsuka, Yohei Takahashi, Tomohiko Oishi, and Jing-Yuan Ko, "Quick and easy measurement of particle size of Brownian particles and planktons in water using a self-mixing laser," Opt. Express 14, 1044-1054 (2006)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-14-3-1044


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References

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