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Proceedings Paper

Continuous spectral measurement of backscattering in sea water
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Paper Abstract

A prototype for an active backscattering probe for continuous backscattering spectrum measurement in sea water was designed and tested in both lab and field experiments. For the laboratory experiments, at various algae concentrations, the impact of overlapping chlorophyll fluorescence was effectively eliminated by using a long pass filter on the excitation light source. In the field tests with an active light source, and under the conditions of strong algal scattering (eg bloom conditions) it was shown that the impact of ambient background day light can be accounted for by successive measurements with the lamp illumination periodically on-off. The results show that the spectral shape of backscattering of algae cells is highly structured and consistent with Mie calculations which take into account the anomalous dispersion due to the strong absorption features of chlorophyll. The backscatter ratio, however, is found to be stable (within 10%) throughout the entire spectral region outside the chlorophyll fluorescence band, even when scattering is dominated by that from algae cells.

Paper Details

Date Published: 25 September 2007
PDF: 8 pages
Proc. SPIE 6755, Advanced Environmental, Chemical, and Biological Sensing Technologies V, 67550J (25 September 2007); doi: 10.1117/12.731642
Show Author Affiliations
J. Zhou, City College/CUNY (United States)
A. Gilerson, City College/CUNY (United States)
I. Ioannou, City College/CUNY (United States)
B. Gross, City College/CUNY (United States)
F. Moshary, City College/CUNY (United States)
S. Ahmed, City College/CUNY (United States)


Published in SPIE Proceedings Vol. 6755:
Advanced Environmental, Chemical, and Biological Sensing Technologies V
Tuan Vo-Dinh; Robert A. Lieberman; Günter Gauglitz, Editor(s)

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