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Updated: Apr 16, 2026

Operation of Laboratory Photobioreactors with Online Growth Measurements and Customizable Light Regimes
Published on: October 28, 2021
Design and test of a low-cost RGB sensor for online measurement of microalgae concentration within a photo-bioreactor
Micaela Benavides1, Johan Mailier2, Anne-Lise Hantson3
1BioSys, University of Mons, Boulevard Dolez 31, 7000 Mons, Belgium. micaela.benavides@umons.ac.be.
Abstract:
In this study, a low-cost RGB sensor is developed to measure online the microalgae concentration within a photo-bioreactor. Two commercially available devices, i.e., a spectrophotometer for offline measurements and an immersed probe for online measurements, are used for calibration and comparison purposes. Furthermore, the potential of such a sensor for estimating other variables is illustrated with the design of an extended Luenberger observer.
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