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Proceedings Paper

Presentation of the optical sensor OPTISENS designed for Eulerian measurements of phytoplankton on a moored buoy
Author(s): Zsolt Volent; Geir Johnsen
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Paper Abstract

Since 1988 a newly designed transmissometer (OPTISENS) has been used along the southern Norwegian coast to monitor phytoplankton blooms. The instrument has been suspended on a buoy equipped with an ARGOS PTT for satellite transmission of data. The OPTISENS is a light beam transmissometer with 3 different colors of the light, i.e. red, green and blue with peak wavelengths at 650 nm, 555 nm and 470 nm, respectively. Long-term measurements in the sea and laboratory experiments of in vivo absorption- and fluorescence excitation spectra, have demonstrated that it not only can distinguish between different particles but also identify of different groups of bloom-forming phytoplankton, some of which are toxic. The attenuation coefficient ratios between the colors blue, green, yellow and red will be discussed for different phytoplankton groups.

Paper Details

Date Published: 10 December 1993
PDF: 9 pages
Proc. SPIE 2048, Underwater Light Measurements, (10 December 1993); doi: 10.1117/12.165500
Show Author Affiliations
Zsolt Volent, OCEANOR--Oceanographic Co. of Norway AS (Norway)
Geir Johnsen, Univ. of California/Santa Barbara (United States)

Published in SPIE Proceedings Vol. 2048:
Underwater Light Measurements
Hans-Christian Eilertsen, Editor(s)

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