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Proceedings Paper

Short- and long-path laser-induced fluorescence in the water column for the detection of dissolved chemicals
Author(s): Gert Sinn; Klaus-Henrik Mittenzwey; Stefan Harsdorf; Rainer Reuter
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Paper Abstract

Lidar monitoring of surface waters has usually been applied to fluorescent and nonfluorescent soluble chemicals can be investigated. Two signals have to be measured, the total fluorescence lidar intensity L, which is characterized by long path-lengths of the laser radiation in the water column, and the fluorescence F, which originates from the first layers immediately below the water surface. The ratio of both intensities F/L yields the total attenuation coefficient at the laser wavelength considering also nonfluorescent substances besides fluorescent ones. A simple experiment in the laboratory was performed using a nitrogen laser. Water samples containing algae and a defined amount of humic acid were polluted with fluorescent quinine sulphate and nonfluorescent azobencene and p-nitrophenol down to ppb-concentrations. Synchronously, the attenuation coefficients were measured by conventional absorption spectroscopy. Good correlations between the conventional and the lidar-derived attenuation coefficients were achieved, described by squared correlation coefficients of r2 > 0.95. The F/L ratio seems to be a good tool in lidar monitoring of dissolved chemicals in waters.

Paper Details

Date Published: 23 May 1997
PDF: 8 pages
Proc. SPIE 3107, Remote Sensing of Vegetation and Water, and Standardization of Remote Sensing Methods, (23 May 1997); doi: 10.1117/12.274756
Show Author Affiliations
Gert Sinn, OPTOSENS GmbH (Germany)
Klaus-Henrik Mittenzwey, OPTOSENS GmbH (Germany)
Stefan Harsdorf, Carl von Ossietzky Univ. Oldenburg (Germany)
Rainer Reuter, Carl von Ossietzky Univ. Oldenburg (Germany)

Published in SPIE Proceedings Vol. 3107:
Remote Sensing of Vegetation and Water, and Standardization of Remote Sensing Methods
Giovanna Cecchi; Torsten Lamp; Rainer Reuter; Konradin Weber, Editor(s)

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