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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 9 — Sep. 4, 2009

Determination of velocity of self-mobile phytoplankton using a self-mixing thin-slice solid-state laser

Seiichi Sudo, Takayuki Ohtomo, Yohei Takahashi, Tomohiko Oishi, and Kenju Otsuka  »View Author Affiliations

Applied Optics, Vol. 48, Issue 20, pp. 4049-4055 (2009)

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We present an analysis of the shoulder-shaped power spectrum observed in the modulated laser output due to feedback light scattered from dynamic changes in self-mobile phytoplankton with flagella in seawater performed using a self-mixing laser Doppler vibrometry system. The power spectrum occasionally has shoulder-shaped broad frequency components superimposed on a Lorentz-type spectrum. This reflects the translational motion of phytoplankton moving across the beam-focus area. The velocity of phytoplankton in the focus area can be obtained by applying a curve fitting procedure to the power spectrum. Moreover, the average velocity and the velocity distribution of phytoplankton can be determined from curve fitting of the long-term power spectrum.

© 2009 Optical Society of America

OCIS Codes
(280.7250) Remote sensing and sensors : Velocimetry
(280.1415) Remote sensing and sensors : Biological sensing and sensors

ToC Category:
Remote Sensing and Sensors

Original Manuscript: April 28, 2009
Manuscript Accepted: June 24, 2009
Published: July 9, 2009

Virtual Issues
Vol. 4, Iss. 9 Virtual Journal for Biomedical Optics

Seiichi Sudo, Takayuki Ohtomo, Yohei Takahashi, Tomohiko Oishi, and Kenju Otsuka, "Determination of velocity of self-mobile phytoplankton using a self-mixing thin-slice solid-state laser," Appl. Opt. 48, 4049-4055 (2009)

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