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- W2019977752 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 r<SUP>2</SUP> > 0.95. The F/L ratio seems to be a good tool in lidar monitoring of dissolved chemicals in waters." @default.
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- W2019977752 date "1997-05-23" @default.
- W2019977752 modified "2023-09-23" @default.
- W2019977752 title "<title>Short- and long-path laser-induced fluorescence in the water column for the detection of dissolved chemicals</title>" @default.
- W2019977752 doi "https://doi.org/10.1117/12.274756" @default.
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