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We describe a fluorometric method for phytoplankton classified measure. The sinusoidal-amplitude-modulation (SAM) technique is used in this method. The fluorescence of samples is excited in blue, green and amber excitation channels and demodulated simultaneously. We demonstrate experimentally that the system offers a detection limit of chlorophyll a down to 0.005μg/L and a detection time of 1s. Compared...
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