@inproceedings{RostanKruglovEngelbrecht2023, author = {Rostan, Katharina and Kruglov, Roman and Engelbrecht, Rainer}, title = {2x2 Factorial Calibration of FBG Sensors for Simultaneous Measurement of Temperature and Humidity in PEM Fuel Cells}, series = {Sensor and Measurement Science International Conference 2023}, volume = {2023}, booktitle = {Sensor and Measurement Science International Conference 2023}, publisher = {AMA Service GmbH, Von-M{\"u}nchhausen-Str. 49, 31515 Wunstorf, Germany}, isbn = {978-3-9819376-8-8}, doi = {10.5162/SMSI2023/P56}, pages = {388 -- 389}, year = {2023}, abstract = {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.}, language = {en} } @inproceedings{RostanKruglovEngelbrecht2024, author = {Rostan, Katharina and Kruglov, Roman and Engelbrecht, Rainer}, title = {Entwicklung und Charakterisierung eines Erbium-dotierten Glasfasersensors zur Temperaturmessung}, year = {2024}, language = {de} } @incollection{WeilandLuberRostanetal.2022, author = {Weiland, Josef and Luber, Michael and Rostan, Katharina and Schiebahn, Alexander and Engelbrecht, Rainer and Reisgen, Uwe}, title = {Strain Monitoring of a Structural Adhesive Bond by Embedding a Polymer Optical Fiber}, series = {European Workshop on Structural Health Monitoring , Vol I}, booktitle = {European Workshop on Structural Health Monitoring , Vol I}, publisher = {Springer International Publishing}, address = {Cham}, isbn = {9783031072536}, issn = {2366-2557}, doi = {10.1007/978-3-031-07254-3_75}, pages = {745 -- 754}, year = {2022}, abstract = {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.}, language = {en} } @inproceedings{EngelbrechtRostanWeilandetal.2022, author = {Engelbrecht, Rainer and Rostan, Katharina and Weiland, Josef and Luber, Michael and Schiebahn, Alexander and Reisgen, Uwe}, title = {Modal Distribution in Polymer Optical Fibers as Sensor for Load Monitoring in Semi-Structural Adhesive Bonds}, series = {27th International Conference on Optical Fiber Sensors}, booktitle = {27th International Conference on Optical Fiber Sensors}, publisher = {Optica Publishing Group}, address = {Washington, D.C.}, isbn = {978-1-957171-14-2}, doi = {10.1364/OFS.2022.W2.3}, year = {2022}, abstract = {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.}, language = {en} } @inproceedings{RostanKruglovSeissetal.2023, author = {Rostan, Katharina and Kruglov, Roman and Seiß, Volker and Thiel, Susanne and Eichelbaum, Maik and Engelbrecht, Rainer}, title = {In-situ Temperature and Humidity Measurement in PEM Fuel Cells with Off-the-shelf FBG}, series = {28th International Conference on Optical Fiber Sensors}, volume = {2023}, booktitle = {28th International Conference on Optical Fiber Sensors}, publisher = {Optica Publishing Group}, address = {Washington, D.C.}, isbn = {978-1-957171-30-2}, doi = {10.1364/OFS.2023.Tu3.36}, pages = {4}, year = {2023}, abstract = {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.}, language = {en} }