TY - CHAP A1 - Rostan, Katharina A1 - Kruglov, Roman A1 - Engelbrecht, Rainer T1 - 2x2 Factorial Calibration of FBG Sensors for Simultaneous Measurement of Temperature and Humidity in PEM Fuel Cells T2 - Sensor and Measurement Science International Conference 2023 N2 - Fiber Bragg grating (FBG) sensor technology is expected to make an important contribution to extending the lifetime of polymer electrolyte membrane (PEM) fuel cells. It allows accurate measurements of in-situ operating temperature and humidity, which is essential for an accurate control of both. For these applications an accurate and reliable calibration is crucial. This paper demonstrates the successful use of a 2x2 factorial calibration method for calibration of two standard FBGs for application in a PEM fuel cell. The calibrated low-cost FBG sensor allows temperature and humidity measurements with a RMS error (RMSE) of 0.45°C and 4.8 %RH, respectively. KW - Fiber Bragg grating KW - Temperature sensing KW - Humidity sensing KW - PEM fuel cell Y1 - 2023 SN - 978-3-9819376-8-8 U6 - https://doi.org/10.5162/SMSI2023/P56 VL - 2023 SP - 388 EP - 389 PB - AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany ER - TY - CHAP A1 - Rostan, Katharina A1 - Kruglov, Roman A1 - Engelbrecht, Rainer T1 - Entwicklung und Charakterisierung eines Erbium-dotierten Glasfasersensors zur Temperaturmessung KW - Faseroptik Y1 - 2024 ER - TY - CHAP A1 - Weiland, Josef A1 - Luber, Michael A1 - Rostan, Katharina A1 - Schiebahn, Alexander A1 - Engelbrecht, Rainer A1 - Reisgen, Uwe T1 - Strain Monitoring of a Structural Adhesive Bond by Embedding a Polymer Optical Fiber T2 - European Workshop on Structural Health Monitoring , Vol I N2 - In recent decades, adhesive bonding technology has become increasingly important in all industrial sectors, for example in the aerospace industry, the automotive industry or the construction industry. This is accompanied by an increased need for monitoring of adhesive bonds, especially for load-bearing, structural joints. In order to detect a possible failure at an early stage, this work is investigating a cost-effective sensor principle based on embedding of a polymer optical fiber (POF) into the adhesive layer. The strain and stress behavior of the adhesive bond are transferred to the POF and change its light-guiding properties. In the presented work, different light coupling conditions into the fiber (full excitation and angle-selective excitation) and different measurable quantities of the transmitted light decoupled from the fiber (photocurrent and far-field) are studied, to find an optimum sensor performance. The combination of a structural polyurethane adhesive with commercially available POF is investigated. The results show a high potential of the method for simple photocurrent measurement (transmission loss of 8% by half of maximum load) and an even more sensitive sensor effect for mode-dependent light power measurement. Y1 - 2022 SN - 9783031072536 U6 - https://doi.org/10.1007/978-3-031-07254-3_75 SN - 2366-2557 SP - 745 EP - 754 PB - Springer International Publishing CY - Cham ER - TY - CHAP A1 - Engelbrecht, Rainer A1 - Rostan, Katharina A1 - Weiland, Josef A1 - Luber, Michael A1 - Schiebahn, Alexander A1 - Reisgen, Uwe T1 - Modal Distribution in Polymer Optical Fibers as Sensor for Load Monitoring in Semi-Structural Adhesive Bonds T2 - 27th International Conference on Optical Fiber Sensors N2 - PMMA polymer optical fibers embedded in semi-structural polyurethane adhesive bonds serve as economical load sensor for structural health monitoring by evaluating load-dependent optical transmission as well as modal distribution measured by a far-field camera. Scaling of sensor quantities by the sensitive fiber length is shown. KW - Fiber optics KW - Adhesive bonds KW - Sensors Y1 - 2022 SN - 978-1-957171-14-2 U6 - https://doi.org/10.1364/OFS.2022.W2.3 PB - Optica Publishing Group CY - Washington, D.C. ER - TY - CHAP A1 - Rostan, Katharina A1 - Kruglov, Roman A1 - Seiß, Volker A1 - Thiel, Susanne A1 - Eichelbaum, Maik A1 - Engelbrecht, Rainer T1 - In-situ Temperature and Humidity Measurement in PEM Fuel Cells with Off-the-shelf FBG T2 - 28th International Conference on Optical Fiber Sensors N2 - We propose a cost efficient fiber Bragg grating (FBG) sensor for measuring temperature and humidity in polymer electrolyte membrane fuel cells (PEMFC). The multiparameter sensor works with two conventional FBG and achieves an RMSE better than 0.45°C and 4.8 %RH. KW - Proton exchange membrane fuel cells KW - Temperature and humidity KW - Fiber Bragg grating Y1 - 2023 SN - 978-1-957171-30-2 U6 - https://doi.org/10.1364/OFS.2023.Tu3.36 VL - 2023 PB - Optica Publishing Group CY - Washington, D.C. ER -