Short- and long-path laser-induced fluorescence in the water column for the detection of dissolved chemicals

Gert Sinn; Klaus-Henrik Mittenzwey; Stefan Harsdorf; Rainer Reuter

doi:10.1117/12.274756

23 May 1997 Short- and long-path laser-induced fluorescence in the water column for the detection of dissolved chemicals

Gert Sinn, Klaus-Henrik Mittenzwey, Stefan Harsdorf, Rainer Reuter

Author Affiliations +

Proceedings Volume 3107, Remote Sensing of Vegetation and Water, and Standardization of Remote Sensing Methods; (1997) https://doi.org/10.1117/12.274756
Event: Environmental Sensing III, 1997, Munich, Germany

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.

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Gert Sinn, Klaus-Henrik Mittenzwey, Stefan Harsdorf, and Rainer Reuter "Short- and long-path laser-induced fluorescence in the water column for the detection of dissolved chemicals", Proc. SPIE 3107, Remote Sensing of Vegetation and Water, and Standardization of Remote Sensing Methods, (23 May 1997); https://doi.org/10.1117/12.274756

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