Test and Control System for Chlorophyll Fluorescence Parameters Using LED as Excitation Source

A new scheme on test and control system for chlorophyll fluorescence is presented in this work, which uses light-emitting diode (LED) excitation by means of measuring the fluorescence parameter φpsII. The system takes programmable power supply as LEDs illumination drive power with high sensitivity and signal-tonoise ratio. MINIPAM is used to measure fluorescence parameter φpsII and keeps communication with upper PC by serial port. The upper PC can control the power supply and process the data received from MINIPAM by software which is programmed in VB6. The results show that the system has a lot of advantages such as high accuracy and convenience. The effect of environmental factors on fluorescence parameters is analyzed comprehensively. It will be a practical measurement and control system for photosynthetic ability and have wide application foreground.