Biofeedback Control for Optimizing Light Intensity on Plants Based on Canopy Level Chlorophyll Fluorescence Gain

Motivated by an increasing population and the desire to grow plants more efficiently,
attention has turned to the use of Light Emitting Diodes (LEDs) to illuminate plants
which are grown indoors. Indoor growing facilities enable closely controlled and mon-
itored environmental conditions. More and more of these facilities exchange High
Pressure Sodium (HPS) lamps for LED lighting since they provide more efficient
lighting and the possibility to control light intensity and quality in order to illumi-
nate plants with suitable light. However, most plants are grown under rather low,
constant light regardless of the plants’ needs. Therefore, this work aims at develop-
ing a procedure to use a response from the plants in a controller to provide optimal
lighting for the plants. Optimal in this case means that the plants perform photo-
synthesis at the highest light intensity which still allows maximum efficiency. To this
end, plants are excited to give a fluorescence response of which the steady-state is
studied. This signal is independent of the current incident light and used as control
signal in a perturbation-based extremum seeking controller. The controller strives
to locate and track the optimal light intensity which might be subject to changes in
environmental conditions and plants’ health. By covering many important aspects
of the proposed measurement procedure, this thesis provides the basis for further
research in this matter.

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Created: 3rd Nov 2020 at 21:31

Last updated: 4th Nov 2020 at 09:17

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