Measurement and control system for chlorophyll fluorescence parameters using led excitation

In this paper, a new measurement and control system for chlorophyll fluorescence is proposed, which uses light-emitting diode ( LED) excitation by means of measuring the fluorescence parameter Phi psII. The system takes programmable power supply as LEDs illumination drive power with high sensitivity and signal-to-noise ratio. The system uses MINIPAM to measure fluorescence parameter (Phi psII 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 Delphi7. The results show that, comparing with traditional method, the system has a lot of advantages such as high accuracy and good reliability and convenience. It will be a practical measurement and control system for photosynthetic ability and have wide application foreground.