Abstract
We developed a UV (355nm) laser-induced fluorescence (LIF) lidar for monitoring the real-time status of blue-green algae. Since the fluorescence spectrum of blue-green algae excited by 355nm showed the specific fluorescence at 650nm, the lidar was designed to be able to detect the 650nm fluorescence as a surveillance method for the algae. The usefulness was confirmed by observation at Lake Suwa over four years (2005-2008). The detection limit of the LIF lidar was 16.65mg/L for the blue-green algae, which is the range of concentrations in the safe level set by the World Health Organization.
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