Examples of the application of optical process and quality sensing (OPQS) to beer brewing and polyurethane foaming processes.
Optical methods play an important role in process analytical technologies (PAT). Four examples of optical process and quality sensing (OPQS) are presented, which are based on three important experimental techniques: near-infrared absorption, luminescence quenching, and a novel method, photon density wave (PDW) spectroscopy. These are used to evaluate four process and quality parameters related to beer brewing and polyurethane (PU) foaming processes: the ethanol content and the oxygen (O2) content in beer, the biomass in a bioreactor, and the cellular structures of PU foam produced in a pilot production plant.
Engelhard
Sonja
S
Institute of Chemistry & Interdisciplinary Center of Photonics, University of Potsdam, Karl-Liebknecht-Str 24-25, 14476 Potsdam-Golm, Germany.
Kumke
Michael U
MU
Löhmannsröben
Hans-Gerd
HG
D001515:Beer / Q000032:analysis*; D018533:Biomass; D000431:Ethanol / Q000032:analysis; D055095:Optics and Photonics; D010100:Oxygen / Q000032:analysis; D011140:Polyurethanes / Q000032:analysis*; D011786:Quality Control; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods
D011140:Polyurethanes; D000431:Ethanol; D010100:Oxygen