Mobile Picosecond-Fluorimeter for Studying Vegetation Stress
A mobile picosecond-fluorimeter has been designed to study the photosynthetic activity of green plants in situ. This has been obtained by using a pulsed red laser diode and optical fibers. The decay of the chlorophyll fluorescence is measured by time correlated photon counting and analyzed by multiexponential fits. The average fluorescence lifetime is then calculated. It shows to be a well suited parameter to characterize the efficiency or disturbance (e.g. due to vegetation stress) of the photosynthetic apparatus. Short accumulation times enable us to observe variations within a time range of a few seconds.
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