A developed in situ measuring system uses light emitted diodes (LED) and laser diodes(LD) as light sources is employed
for the recording of algae chlorophyll fluorescence induction kinetics (Kautsky-effect). Photosynthesis activity as an
important parameter is obtained in the system which measures the chlorophyll fluorescence yield. Minimal fluorescence
is excited by the brief but really weak light pulses from LED as measure light while photosynthesis is happened, variable
fluorescence which means there is energy conversion through photosynthesis is also excited by a LED but the beam is
more stronger, LD induced saturation fluorescence stands for maximum fluorescence. The system could works for alga
chlorophyll photosynthesis activity continuous measure in situ through efficiently mechanical and optical design.
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