Determination of velocity of self-mobile phytoplankton using a self-mixing thin-slice solid-state laser.
Appl Opt
; 48(20): 4049-55, 2009 Jul 10.
Article
de En
| MEDLINE
| ID: mdl-19593360
ABSTRACT
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.
Recherche sur Google
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Phytoplancton
/
Fluxmétrie laser Doppler
/
Lasers à solide
/
Mouvement
/
Néphélométrie et turbidimétrie
Langue:
En
Journal:
Appl Opt
Année:
2009
Type de document:
Article
Pays d'affiliation:
Japon