ISHS Acta Horticulturae 418: III International Symposium on Artificial Lighting in Horticulture
A DIGITAL CLOSED-LOOP CONTROL SYSTEM FOR AUTOMATING MEASUREMENTS OF LIGHT COMPENSATION POINTS |
| Author: | M.J. van Lieburg |
| Abstract:
An automated system is described for measuring light compensation points (LCP) of plants or plant parts as an alternative for laborious determination procedures whose efficiency depends to a great extent on personal judgement of the research worker. The system consists of an air-tight transparent container in which the plant or plant part is to be placed and an optional light source which is varied in height interactively with the CO2 signal through a personal computer in combination with an interface. PID (proportional-integral-derivative) controller action ensures reaching the LCP and the CO2 setpoint without overshoot. | |
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