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Continuous ‐ discrete interval observers for monitoring microalgae cultures
Author(s) -
Goffaux G.,
Vande Wouwer A.,
Bernard O.
Publication year - 2009
Publication title -
biotechnology progress
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.572
H-Index - 129
eISSN - 1520-6033
pISSN - 8756-7938
DOI - 10.1002/btpr.167
Subject(s) - bioprocess , interval (graph theory) , key (lock) , sampling interval , component (thermodynamics) , sampling (signal processing) , enclosure , computer science , biological system , biochemical engineering , process engineering , environmental science , mathematics , statistics , engineering , biology , chemical engineering , telecommunications , physics , computer security , combinatorics , detector , thermodynamics
Algorithms estimating unmeasured component concentrations play a key role in bioprocess applications where only a few on‐line measurements are usually available. In this article, interval observers are designed to provide guaranteed intervals for the key components involved in cultures of microalgae. In contrast with most of the published studies focusing on continuous‐time measurements, this study considers discrete‐time measurements with possibly long and irregular sampling and defines predictors based on model equations and state transformations to ensure the enclosure of the state variables between two measurement times. The methods are validated with experimental data where the remaining inorganic nitrogen and the microalgal internal quota are estimated. © 2009 American Institute of Chemical Engineers Biotechnol. Prog., 2009