TY - JOUR A1 - Schukar, Marcus A1 - Krebber, Katerina A1 - Scheer, M. T1 - Strahlungsüberwachung mit Faser-Bragg-Gitter-Sensoren am Elektronenspeicherring BESSY II N2 - Die Eignung von Faser-Bragg-Gitter-(FBG)-Sensoren zur Messung ionisierender Strahlung wurde an einem Undulator des Elektronenspeicherrings BESSY II untersucht. Über einen Zeitraum von 20 Wochen wurde eine durch Strahlung verursachte Bragg-Wellenlängenänderung der FBG-Sensoren von 25pm gemessen, was einer Strahlendosis von 720 Gy entspricht. The suitability of using fiber Bragg grating (FBG) sensors for the measurement of ionizing radiation on the electron storage ring BESSY II by measuring the Bragg wavelength shift caused by radiation was investigated. During a time period of 20 weeks a Bragg wavelength shift of 25pm caused by the ionizing radiation was measured by FBG sensors at the storage ring. This Bragg wavelength shift corresponds to a radiation dose value of 720 Gy. KW - Faseroptische Sensoren KW - Faser-Bragg-Gitter KW - Dosimetrie KW - Strahlungssensoren KW - Elektronenspeicherring KW - Fiber optic sensors KW - Fiber Bragg gratings KW - Radiation dosimetry KW - Radiation sensors KW - Electron storage ring PY - 2008 DO - https://doi.org/10.1524/teme.2008.0834 SN - 0340-837X SN - 0178-2312 SN - 0171-8096 VL - 75 IS - 4 SP - 245 EP - 250 PB - Oldenbourg CY - München AN - OPUS4-17655 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Krebber, Katerina A1 - Lenke, Philipp A1 - Liehr, Sascha A1 - Witt, Jens A1 - Schukar, Marcus A1 - Large, M. A1 - Thiel, T. T1 - Technology and Applications of Smart Technical Textiles Based on POF T2 - 17th International Conference on Plastic Optical Fibers (POF 2008), August 25-28, 2008 CY - Santa Clara, California, USA DA - 2008-08-25 KW - Fiber optic sensors KW - Polymer optical fibers (POF) KW - POF sensors KW - Smart technical textiles PY - 2008 SP - 1 EP - 10 AN - OPUS4-17870 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Witt, Jens A1 - Schukar, Marcus A1 - Krebber, Katerina T1 - Polymeroptische Fasersensoren für die Atmungssensorik T2 - 19th International Scientific Conference Mittweida CY - Mittweida, Deutschland DA - 2008-11-05 KW - Faseroptischer Sensor KW - Medizinische Textilien KW - Intelligente Textilien KW - Atmungssensor KW - OTDR KW - POF KW - Mikrostrukturierte POF (mPOF) KW - Langperiodische Gitter (LPG) PY - 2008 SN - 1437-7624 SN - 1430-3698 IS - 5 SP - 21 EP - 25 CY - Mittweida AN - OPUS4-18404 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Witt, Jens A1 - Schukar, Marcus A1 - Krebber, Katerina T1 - Medizinische Textilien mit integrierten polymeroptischen Fasern zur Atmungssensorik KW - Atmungssensor KW - Intelligente Textilien KW - Faseroptischer Sensor KW - POF-Sensor KW - OTDR KW - Respiration sensor KW - Intelligent textile KW - Fiberoptic sensor KW - POF sensor KW - OTDR PY - 2008 DO - https://doi.org/10.1524/teme.2008.0905 SN - 0340-837X SN - 0178-2312 SN - 0171-8096 VL - 75 IS - 12 SP - 1 EP - 8 PB - Oldenbourg CY - München AN - OPUS4-18587 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Luber, M. A1 - Poisel, H. A1 - Ziemann, O. A1 - Diez, J. A1 - Durana, G. A1 - Schukar, Marcus T1 - Erfahrungen mit dem praktischen Einsatz eines faseroptischen Dehnungssensors T2 - 19th International Scientific Conference CY - Mittweida, Germany DA - 2008-11-05 KW - Faseroptische Sensoren KW - Dehnungssensoren KW - Phasenmesstechnik KW - Windenergieanlagen KW - Rotorblatt PY - 2008 SN - 1437-7624 SN - 1430-3698 IS - 5 SP - 26 EP - 30 CY - Mittweida AN - OPUS4-18588 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Steffen, Milan A1 - Schukar, Marcus A1 - Witt, Jens A1 - Krebber, Katerina A1 - Large, M. A1 - Argyros, A. T1 - Investigation of MPOF-LPGs for sensing applications N2 - The versatility of MPOF offers a variety of sensing applications. In this paper the influence of strain, temperature and humidity is investigated. The results show that MPOF LPGs are well suited for strain sensing. Further investigations have to be made to clarify the behaviour on temperature and humidity in more detail. T2 - POF 2009 - 18th International conference on plastic optical fibers CY - Sydney, Australia DA - 2009-09-07 KW - Mikrostrukturierte Polymerfasern (MPOF) KW - Langperiodische Gitter (LPG) KW - Faseroptische Sensorik KW - Dehnungssensor KW - Klimatische Effekte PY - 2009 IS - Session 1 (S1_25) SP - 1 EP - 4 CY - Sydney, Australia AN - OPUS4-19887 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Witt, Jens A1 - Schukar, Marcus A1 - Krebber, Katerina A1 - Jonckheere, J. de A1 - Paquet, B. A1 - Depré, A. T1 - Respiratory sensor based on POF OTDR N2 - We report on the characterization and test of a respiratory sensor based on POF OTDR, developed for monitoring of patients during MRI examination. The sensor is based on an optical fibre integrated into an elastic belt using a macrobending layout. T2 - POF 2009 - 18th International conference on plastic optical fibers CY - Sydney, Australia DA - 2009-09-07 KW - Faseroptischer Sensor KW - Medizinische Textilien KW - Intelligente Textilien KW - Atmungssensor KW - OTDR KW - POF PY - 2009 IS - Session 6 ( S6_74) SP - 1 EP - 4 CY - Sydney, Australia AN - OPUS4-19889 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schukar, Marcus A1 - Krebber, Katerina A1 - Large, M. A1 - Lwin, R. T1 - Climatic investigations of microstructured polymer optical fibers N2 - The behaviour of optical transmission of microstructured polymer optical fibers (MPOFs) by varying temperature and humidity was investigated whereas different MPOFs with varying hole structures and manufacturing procedures were used. T2 - POF 2009 - 18th International conference on plastic optical fibers CY - Sydney, Australia DA - 2009-09-07 KW - Mikrostrukturierte Polymerfasern (MPOF) KW - Klimatische Effekte KW - Faseroptische Sensorik KW - Langperiodische Gitter (LPG) PY - 2009 IS - Session 1 (S1_25) SP - 1 EP - 4 CY - Sydney, Australia AN - OPUS4-19916 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schukar, Marcus T1 - Integration Technology of POF Sensors into Composites for Structural Health Monitoring T2 - 18th International Conference on Plastic Optical Fibers CY - Sydney, Australia DA - 2009-09-07 PY - 2009 AN - OPUS4-20486 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Witt, Jens A1 - Steffen, Milan A1 - Schukar, Marcus A1 - Krebber, Katerina T1 - Investigation of sensing properties of microstructured polymer optical fibres N2 - We investigated sensing properties of single mode poly methyl methacrylate (PMMA) microstructured polymer optical fibres (MPOF) with mechanically imprinted long period gratings (LPG). After preparation of the MPOF end-faces the samples were elongated with silica fibres. These samples were used to measure the influence of strain to the LPG wavelength which showed the viscoelastic nature of PMMA. We also measured the influence of temperature and humidity. The results show that MPOF LPGs are well suited for strain sensing. One MPOF LPG was stitched to a textile. Using this textile we measured a simulated respiratory motion. T2 - Photonics Europe 2010: Nanophotonics and photonics materials CY - Brussels, Belgium DA - 2010-04-12 KW - Microstructured polymer optical fibre KW - Long period grating KW - Strain sensor KW - Humidity sensor KW - Temperature sensor KW - Respiratory sensor PY - 2010 SN - 978-0-8194-8206-8 DO - https://doi.org/10.1117/12.854656 SN - 0277-786X VL - 7714 IS - 7714-12 SP - 77140F-1 - 77140F-12 AN - OPUS4-21740 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Krebber, Katerina A1 - Lenke, Philipp A1 - Liehr, Sascha A1 - Nöther, Nils A1 - Schukar, Marcus A1 - Wendt, Mario A1 - Witt, Jens A1 - Wosniok, Aleksander T1 - Technology and applications of smart technical textiles based on fibre optic sensors N2 - Technical textiles with embedded fibre optic sensors habe been developed for the purposes of the structural health monitoring in geotechnical and civil engineering as well as for healthcare monitoring in the medical sector. The paper shows selected examples of using such sensor-based smart textiles for different applications. T2 - International conference "Optical sensors" CY - Karlsruhe, Germany DA - 2010-06-21 PY - 2010 IS - STuC2.pdf SP - 1 EP - 2(?) AN - OPUS4-21567 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Krebber, Katerina A1 - Grillet, A. A1 - Witt, Jens A1 - Schukar, Marcus A1 - Kinet, D. A1 - Thiel, T. A1 - Pirotte, F. A1 - Depré, A. T1 - Optical fibre sensors embedded into technical textile for healthcare (ofseth) T2 - 16th International Conference on Plastic Optical Fibers (POF 2007) CY - Turin, Italy DA - 2007-09-10 PY - 2007 SP - 227 EP - 233 PB - International Cooperative of Plastic Optical Fibers (ICPOF) CY - Turin, Italy AN - OPUS4-15824 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Witt, Jens A1 - Schukar, Marcus A1 - Krebber, Katerina T1 - Medical textiles for monitoring of respiratory movements by POF sensors T2 - OPTO 2008 - Photonic Metrology, 8th International Conference on Optical Technologies for Sensing and Measurement CY - Nürnberg, Germany DA - 2008-05-06 KW - POF KW - Fibre optic sensor KW - Medical textile KW - Respiration sensor KW - OTDR PY - 2008 SN - 978-3-9810993-3-1 IS - Chapter 4.2 SP - 99 EP - 104 AN - OPUS4-17475 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Witt, Jens A1 - Schukar, Marcus A1 - Krebber, Katerina A1 - Demuth, J. A1 - Sasek, L. T1 - Heart rate sensor for integration into personal protective equipment N2 - This paper reports on a fibre optic sensor for heart rate measurement which is developed within the framework of the FP7 EU project i-Protect. Goal is integration of the sensor into personal protective equipment Two different sensor prototypes based on polymer optical fibre (POF) were developed. One is based on long period gratings in microstrutured POF and the other one is based on macrobending effects in POF. T2 - POF 2011 - 20th International conference on plastic optical fibers CY - Bilbao, Spain DA - 14.09.2011 KW - Heart rate sensor KW - Long period grating KW - Macrobending sensor KW - Microstructured POF (mPOF) KW - Personal protective equipment (PPE) KW - Physiological sensor PY - 2011 SP - 1 EP - 5 AN - OPUS4-24500 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schukar, Marcus A1 - Wischerhoff, E. A1 - Kalbitz, R. T1 - Novel fibre optic temperature sensors based on thermoresponsive polymers N2 - In this paper we present the development of a novel of a fibre optic temperature sensor based on thermoresponsive polymers. The principle of our invention that is already applied for a patent is based on the detection of the optical power that is transmitted through an optical fibre, whilst a temperature sensitive element is integrated in this fibre. T2 - POF 2015 - 24th International conference on plastic optical fibers CY - Nürnberg, Germany DA - 22.09.2015 KW - Optical fibre sensor KW - Temperature sensor KW - Thermoresponsive polymer KW - Optical power measurement PY - 2015 SP - 1 AN - OPUS4-33453 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Witt, Jens A1 - Narbonneau, F. A1 - Schukar, Marcus A1 - Krebber, Katerina A1 - De Jonckheere, J. A1 - Jeanne, M. A1 - Kinet, D. A1 - Paquet, B. A1 - Depré, A. A1 - D´Angelo, L.T. A1 - Thiel, T. A1 - Logier, R. ED - Santos, J.L. ED - Culshaw, B. ED - López-Higuera, J.M. ED - MacPherson, W.N. T1 - Smart medical textiles with embedded optical fibre sensors for continuous monitoring of respiratory movements during MRI N2 - We report on three respiration sensors based on pure optical technologies developed during the FP6 EU project OFSETH. The developed smart medical textiles can sense elongation up to 3%, while maintaining the stretching properties of the textile substrates for a good comfort of the patient. The sensors, based on silica and polymer fibre, are developed for monitoring of patients during MRI examination. The OFSETH harness allows a continuous measurement of respiration movements while all vitals organs are free for medical staff actions. The sensors were tested in MRI environment and on healthy adults. T2 - 4th European workshop on optical fibre sensors CY - Porto, Portugal DA - 2010-09-08 KW - Respiratory sensor KW - Fibre optic sensor KW - Optical time-domain reflectometry (OTDR) KW - MRI KW - Smart textile KW - Healthcare monitoring KW - Fibre Bragg grating (FBG) PY - 2010 SN - 978-0-8194-8083-5 SN - 0277-786X N1 - Serientitel: Proceedings of SPIE – Series title: Proceedings of SPIE IS - 7653 SP - Paper 115, 76533B-1 - 76533B-4 PB - SPIE, the International Society for Optical Engineering CY - Bellingham, Wash. AN - OPUS4-22552 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Witt, Jens A1 - Steffen, Milan A1 - Schukar, Marcus A1 - Krebber, Katerina ED - Santos, J.L. ED - Culshaw, B. ED - López-Higuera, J.M. ED - MacPherson, W.N. T1 - Investigation of sensing properties of long period gratings based on microstructured polymer optical fibres N2 - We investigated the sensing properties of a single mode Poly Methyl Methacrylate (PMMA) Microstructured Polymer Optical Fibre (MPOF) with mechanically imprinted Long Period Grating (LPG). We measured the influence of strain to the LPG wavelength which showed the viscoelastic nature of PMMA. We also measured the influence of temperature and humidity to the LPG wavelength. T2 - 4th European workshop on optical fibre sensors CY - Porto, Portugal DA - 2010-09-08 KW - Microstructured polymer optical fibre KW - Long period grating KW - Strain sensor KW - Humidity sensor KW - Temperature sensor PY - 2010 SN - 978-0-8194-8083-5 SN - 0277-786X N1 - Serientitel: Proceedings of SPIE – Series title: Proceedings of SPIE IS - 7653 SP - Paper 112, 76530I-1 - 76530I-4 PB - SPIE, the International Society for Optical Engineering CY - Bellingham, Wash. AN - OPUS4-22553 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schilder, Constanze A1 - Schukar, Marcus A1 - Steffen, Milan A1 - Krebber, Katerina T1 - Structural health monitoring of composite structures by distributed fibre optic sensors N2 - Structural Health Monitoring of composite materials gains in importance with the increasing use of Composite structures for safety-related applications, e.g. in aerospace. Because of the material properties of composites, defects often occur inside the structures and raise the demand for integrated sensors. The advantages of optical fibres predestine them not only for the surface-application on composite structures but also for the Integration into composite structures. Even without quasi-distributed sensors such as FBGs or LPGs, the optical fibre itself can be used to measure the structure and occurring events over the entire fibre length by distributed sensing techniques. This paper presents the surface-application of polyimide coated silica optical fibres onto PEEK specimens and the integration of copper and polyimide coated silica optical fibres into an AS-4/PEEK Composite to be used as distributed fibre optic sensors for SHM. Results from distributed measurements by optical backscatter reflectometry based on Rayleigh backscattering are shown. T2 - 5th International symposium on NDT in aerospace CY - Singapore DA - 13.11.2013 KW - Structural health monitoring (SHM) KW - Composite structures KW - Optical fibre KW - Distributed fibre optic sensors KW - Optical backscatter reflectometry PY - 2013 SN - 1435-4934 SP - 1 EP - 7 AN - OPUS4-29687 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schilder, Constanze A1 - Schukar, Marcus A1 - Steffen, Milan A1 - Krebber, Katerina ED - López-Higuera, J.M. ED - Jones, J. ED - López-Amo, M. ED - Santos, J.L. T1 - Evaluating distributed fibre optic sensors integrated into thermoplastic composites for structural health monitoring N2 - Strain sensors used for structural health monitoring (SHM) must provide reliable measurement data during their entire service lifetime. To achieve this for fibre optic sensors integrated into composites, the integration of the sensor has to be adapted according to the process conditions. This paper describes the fabrication of thermoplastic composite samples with integrated distributed fibre optic sensors (DFOS) based on copper-nickel and polyimide coated silica optical fibres. The performance of these DFOS as SHM sensors is evaluated in terms of reliability by measurements derived from comparative measurements with resistance strain gauges and from fatigue tests with 10 million load cycles. T2 - OFS2014 - 23rd International conference on optical fibre sensors CY - Santander, Spain DA - 02.06.2014 KW - Distributed fibre optic sensor KW - Integrated sensor KW - Reliability KW - Structural health monitoring KW - Strain gauge KW - Optical frequency domain reflectometry KW - Fatigue test PY - 2014 DO - https://doi.org/10.1117/12.2058604 SN - 0277-786X SN - 1996-756X N1 - Serientitel: Proceedings of SPIE – Series title: Proceedings of SPIE VL - 9157 SP - 91575Q-1 - 91575Q-4 AN - OPUS4-30861 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Karapanagiotis, Christos A1 - Heimann, Jan A1 - Duffner, Eric A1 - Charmi, Amir A1 - Schukar, Marcus A1 - Hashemi, Seyedreza A1 - Prager, Jens T1 - Towards predictive maintenance of hydrogen pressure vessels based on multi-sensor data fusion and digital twin modeling N2 - Hydrogen pressure vessels are among the most essential components for reliable hydrogen technology. Under current regulations, a mostly conservative strategy is employed, restricting the usage time of hydrogen pressure vessels without providing information on the real remaining lifetime. During the service life, pressure vessels are inspected periodically. However, no established method that can provide continuous monitoring or information on the remaining safe service life of the vessel. In this paper, we propose a sensor network for Structural Health Monitoring (SHM) of hydrogen pressure vessels where data from all sensors are collected and centrally evaluated. Specifically, we integrate three different SHM sensing technologies namely Guided Wave ultrasonics (GW), Acoustic Emission testing (AT), and distributed Fiber Optic Sensing (FOS). This integrated approach offers significantly more information and could therefore enable a transition from costly and time-consuming periodic inspections to more efficient and modern predictive maintenance strategies, including Artificial Intelligence (AI)-based evaluation. This does not only have a positive effect on the operational costs but enhances safety through early identification of critical conditions in the overall system in real-time. We demonstrate an experimental set-up of a lifetime test where a Type IV Composite Overwrapped Pressure Vessel (COPV) is investigated under cyclic loading instrumented with AT, FOS, and GW methods. We acquired data from the sensor network until the pressure vessel failed due to material degradation. The data collected using the three different SHM sensor technologies is planned to be evaluated individually, using data fusion, and AI. In the future, we aim to integrate the measurement setup into a hydrogen refueling station with the data stream implemented into a digital signal processing chain and a digital twin. T2 - 11th European Workshop on Structural Health Monitoring CY - Potsdam, Germany DA - 10.06.2024 KW - Acoustic emission KW - Ultrasonic guided waves KW - Fiber optic sensors KW - Hydrogen KW - Pressure vessels KW - Structural health monitoring KW - Machine learning PY - 2024 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-602764 UR - https://www.ndt.net/search/docs.php3?id=29702 SP - 1 EP - 8 PB - NDT.net AN - OPUS4-60276 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Karapanagiotis, Christos A1 - Schukar, Marcus A1 - Breithaupt, Mathias A1 - Duffner, Eric A1 - Ulbricht, Alexander A1 - Prager, Jens A1 - Krebber, Katerina T1 - Structural health monitoring of hydrogen pressure vessels using distributed fiber optic sensing N2 - We report on distributed fiber optic sensing-based monitoring of hydrogen composite overwrapped pressure vessels (COPV) to simultaneously increase the operational lifespan and mitigate maintenance costs. Our approach represents, to the best of our knowledge, the first application of distributed fiber optic sensing for COPV Type IV monitoring, where the sensing fibers are attached to the surface, rather than integrated into the composite material. Specifically, we attach an optical fiber of 50 m to the pressure vessel's surface, covering both the cylindrical and dome sections. We note that our fiber optic sensing technique relies on swept wavelength interferometry providing strain information along the entire length of the optical fiber with high spatial resolution even at the millimeter scale. When the vessel is pressurized, the sensing optical fiber shows a linear strain response to pressure at every position along the fiber. After thousands of load cycles, the vessel finally fails with the optical fiber detecting and precisely localizing the damage in the vessel’s blind dome area. Furthermore, we discuss the potential of state-of-the-art signal processing methods and machine learning for advancing predictive maintenance. This could reduce the number of regular inspections, mitigate premature maintenance costs, and simultaneously increase the vessel’s remaining safe service life. We believe that the structural health monitoring of hydrogen pressure vessels with fiber optic sensors can enhance trust in hydrogen technology contributing to the energy transition in the future. T2 - 11th European Workshop on Structural Health Monitoring CY - Potsdam, Germany DA - 10.06.2024 KW - Hydrogen KW - Fiber optic sensors KW - Composites KW - Machine learning KW - Structural health monitoring PY - 2024 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-602731 UR - https://www.ndt.net/search/docs.php3?id=29701 SP - 1 EP - 7 PB - NDT.net AN - OPUS4-60273 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Karapanagiotis, Christos A1 - Breithaupt, Mathias A1 - Duffner, Eric A1 - Schukar, Marcus T1 - Real-time monitoring of hydrogen composite pressure vessels using surface-applied distributed fiber optic sensors N2 - In this paper, we report to the best of our knowledge for the first time on continuous real-time monitoring of composite overwrapped pressure vessels (COPVs) designed for hydrogen storage using surface-applied distributed fiber optic sensors (DFOS). We conducted continuous and real-time DFOS measurements during pressure cycling tests consisting of periodic pressure fluctuations between 20 bar and 875 bar, with a rate of 5 cycles min−1. During pressure cycling, the DFOS system measured strain changes, that under normal operating conditions were linearly correlated to changes in pressure. To detect and quantify damage-related anomalies, we trained a simple regression model to predict strain from pressure data and used the difference between predicted and measured values as a damage indicator. With our approach, the DFOS system not only detected and localized the damage but also continuously tracked its evolution in real time under dynamic pressure conditions. Furthermore, unlike previous studies where optical fibers were embedded within the composite structure, we applied them on the COPV surface, reducing both implementation cost and time while eliminating the need to modify the COPV manufacturing process. Based on our results, we are confident that DFOS can enhance safety and facilitate the transition from time-consuming periodic inspections to more efficient, machine learning-based predictive maintenance. KW - Fiber optic sensors KW - Hydrogen KW - Structural health monitoring KW - Pressure vessels KW - Predictive maintenance PY - 2025 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-627644 DO - https://doi.org/10.1088/2515-7647/adb9ac SN - 2515-7647 VL - 7 IS - 2 SP - 2 EP - 10 PB - IOP Publishing Ltd CY - Bristol, UK AN - OPUS4-62764 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Rasmussen, H. K. A1 - Fasano, A. A1 - Stajanca, Pavol A1 - Woyessa, G. A1 - Schukar, Marcus A1 - Bang, O. T1 - Mechanical characterization of drawn Zeonex, Topas, polycarbonate and PMMA microstructured polymer optical fibres N2 - The mechanical stress-strain behaviour of polymer optical fibres (POFs) drawn from various materials was measured, both before and after temperature annealing of the POFs. The POFs were drawn from PMMA (GEHR), Zeonex (480R), PC (Makrolon LED2245) and two different grades of Topas (8007S-04 and 5013S-04). With fibre drawing stresses at or above the elastic (uniaxial extensional) plateau modulus, the polymer chains in the POFs have a high degree of alignment, which has a large impact on fibre mechanical behaviour. The testing was performed at straining rates ranging from 0.011%/s, to 1.1%/s for the un-annealed fibres and a straining rate of 1.1%/s for the annealed ones. The elastic modulus of the tested POFs showed no sensitivity toward variation of straining rate. In the case of Topas 5013S-04 and PMMA, the producer-reported values are the same as the one obtained here for the POFs both before and after annealing. The drawn POFs made of Zeonex, PC, and Topas 8007S-04 exhibit larger elastic modulus than the respective materials in the bulk form. The elastic modulus of these fibres is reduced upon annealing by 10-15%, but still remains above the producer-reported values for the bulk polymers. In the nonlinear elastic region, only the PC POF is statistically unaffected by the changes in the straining rate, while Topas 8007S-04 POF shows insensitivity to the straining rate until 3% strain. All other changes affect the stress-strain curves. The annealing flattens all stress-strain curves, making the fibres more sensitive to yield. KW - Polymer optical fibres KW - Mechanical characterization KW - Stree-strain curve KW - PMMA KW - Topas KW - Polycarbonate KW - Zeonex PY - 2018 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-464163 DO - https://doi.org/10.1364/OME.8.003600 SN - 2159-3930 VL - 8 IS - 11 SP - 3600 EP - 3614 PB - Optical Society of America CY - Washington, DC AN - OPUS4-46416 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Witt, Jens A1 - Schukar, Marcus A1 - Breithaupt, Mathias A1 - Müller, Bernd R. A1 - Krebber, Katerina T1 - MPOF LPGs as radiation sensors N2 - We investigated to our knowledge for the first time the capabilities of long period gratings (LPG) in single-mode microstructured polymer optical fibre (mPOF) as real-time gamma dosimeter. The fibre is made from polymethyl methacrylate (PMMA) with a polycarbonate jacket. We measured the radiation-induced wavelength shift of the mPOF LPG loss feature wavelength and the radiation-induced attenuation of a mPOF for different wavelength between 600 nm and 800 nm for gamma radiation with an energy distribution between 6 keV and 18 keV. T2 - POF 2011 - 20th International conference on plastic optical fibers CY - Bilbao, Spain DA - 14.09.2011 KW - Microstructured polymer optical fibre (mPOF) KW - Long period grating (LPG) KW - Radiation sensor PY - 2011 SP - 1 EP - 3 AN - OPUS4-24499 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Stajanca, Pavol A1 - Mihai, L. A1 - Sporea, D. A1 - Negut, D. A1 - Sturm, Heinz A1 - Schukar, Marcus A1 - Krebber, Katerina ED - Webb, D. J. ED - Scully, P. ED - Sugden, K. T1 - Impacts of gamma irradiation on cytop plastic optical fibres N2 - Impact of gamma radiation on transmission of a commercial Cytop polymer optical fibre (Lucina, Asahi Glass Company) is investigated. Spectral dependence of radiation induced attenuation in the investigated fibre is measured in the VIS-NIR spectral region. Besides attenuation increase, radiation is found to increase fibre susceptibility to water as well. While pristine Cytop fibre is rather humidity insensitive, strong humidity related absorption in the NIR region is observed after fibre irradiation. Selective irradiation of separate fibre sections is proposed as a way of fibre humidity sensitization and quasi-distributed water detection is demonstrated using optical time domain reflectometry at 1310 nm. T2 - POF 2016: 25th International Conference on Plastic Optical Fibres CY - Birmingham, UK DA - 13.09.2016 KW - Polymer optical fibers KW - Cytop KW - Gamma radiation PY - 2016 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-403216 SN - 9781854494085 SP - 114 EP - 117 CY - Birmingham AN - OPUS4-40321 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -