TY - GEN A1 - Schallert, Matthias A1 - Krebber, Katerina A1 - Hofmann, Detlef A1 - Habel, Wolfgang A1 - Stahlmann, J. T1 - Auswahl geeigneter Fasersensorprinzipien für Anwendungen in der Geotechnik T2 - Fachseminar "Messen in der Geotechnik 2004" CY - Braunschweig, Deutschland DA - 2004-09-09 PY - 2004 SN - 3-927610-68-2 N1 - Serientitel: Mitteilung des Instituts für Grundbau und Bodenmechanik - Technische Universität Braunschweig – Series title: Mitteilung des Instituts für Grundbau und Bodenmechanik - Technische Universität Braunschweig IS - 77 SP - 309 EP - 328 PB - Inst. für Grundbau und Bodenmechanik, Techn. Univ. CY - Braunschweig AN - OPUS4-4424 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Hofmann, Detlef T1 - Internationale und nationale Normen und Richtlinien für faseroptische Komponenten und Messverfahren T2 - Expertenforum "Faseroptische Sensoren in der praktischen Anwendung" im Rahmen des GESA-Arbeitskreises AK 17: Faseroptische Messverfahren CY - Berlin, Germany DA - 2004-01-27 PY - 2004 AN - OPUS4-4780 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Hofmann, Detlef A1 - Basedau, Frank A1 - Habel, Wolfgang A1 - Gloetzl, R. ED - López-Higuera, J. M. T1 - Lightning-safe diaphragm pressure gauge for geotechnical applications using a long-term reliable absolute EFPI sensor T2 - 2nd European Workshop on Optical Fibre Sensors ; 2nd EWOFS '04 CY - Santander, Spain DA - 2004-06-09 KW - Pressure sensor KW - Fibre Fabry-Pérot interferometer KW - Geotechnical application KW - Precise deformation measurement KW - Long-term stability PY - 2004 SN - 0-8194-5434-6 DO - https://doi.org/10.1117/12.566543 SN - 0038-7355 N1 - Serientitel: SPIE proceedings series – Series title: SPIE proceedings series IS - 5502 SP - 128 EP - 131 PB - SPIE CY - Bellingham, Wash. AN - OPUS4-3844 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Gloetzl, R. A1 - Hofmann, Detlef A1 - Basedau, Frank A1 - Habel, Wolfgang ED - Udd, E. T1 - Geotechnical Pressure Cell Using a Long-Term Reliable High-Precision Fibre Optic Sensor Head T2 - 12th SPIE International Symposium "Smart Structures and Materials 2005 CY - San Diego, CA, USA DA - 2005-03-06 KW - Pressure sensor KW - Fabry-Pérot interferometer KW - Geotechnics KW - Deformation measurement KW - Long-term stability PY - 2005 SN - 0-8194-5739-6 SN - 1605-7422 N1 - Serientitel: SPIE proceedings series – Series title: SPIE proceedings series IS - 5758 SP - 248 EP - 253 PB - SPIE CY - Bellingham AN - OPUS4-11769 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Hofmann, Detlef T1 - Formblattentwurf für die einheitliche Charakterisierung technisch verwertbarer faseroptischer Sensorlösungen T2 - Vortrag auf der Sitzung des GESA-AK 17 "Faseroptische Sensorik". CY - Cologne, Germany DA - 2005-01-20 PY - 2005 AN - OPUS4-11733 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Habel, Wolfgang A1 - Dantan, Nathalie A1 - Hofmann, Detlef A1 - Krebber, Katerina A1 - Schallert, Matthias T1 - Ausgewählte Anwendungsbeispiele faseroptischer Sensoren im Ingenieurbau und in der Geotechnik T2 - Ingenieurvermessung 07 CY - Graz, Österreich DA - 2007-04-17 PY - 2007 SP - 281 EP - 294 PB - Wichmann CY - Graz AN - OPUS4-14760 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Habel, Wolfgang A1 - Krebber, Katerina A1 - Dantan, Nathalie A1 - Schallert, Matthias A1 - Hofmann, Detlef ED - Bin Shi, T1 - Recent examples of applied fibre optic sensors in geotechnical areas to evaluate and monitor structural integrity T2 - OSMG-2007 - 2nd International Workshop on Opto-electronic Sensor-based Monitoring in Geo-engineering CY - Nanjing, China DA - 2007-10-18 KW - Fibre optic sensors KW - Monitoring KW - Geotechnique KW - Pile load test KW - pH sensor KW - Geotextile monitoring KW - Ground anchor monitoring KW - Distributed sensor PY - 2007 SP - 27 EP - 35 CY - Nanjing, China AN - OPUS4-16431 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schilder, Constanze A1 - Hofmann, Detlef A1 - Kohlhoff, Harald A1 - Habel, Wolfgang ED - Ramos, G. A. T1 - Structure-integrated fiber-optic strain wave sensor for concrete pile testing and monitoring N2 - Reinforced concrete piles are used in case of structures that are constructed on soft ground to transfer the loads into deeper strata with sufficient bearing capacity. In order to determine the pile’s behavior and possible damage, static and dynamic pile tests are carried out. Dynamic measurements taken from the pile head can show the bearing behavior and structural integrity by using the theory of wave propagation. In order to receive more precise information about the pile features, now, a string of sensors is embedded at different levels of the pile. A fiber optic strain wave sensor, based on the extrinsic Fabry-Perot interferometer (EFPI), has already been developed and tested in full-scale field tests by Schallert (2010). It was possible to detect the introduced deformation caused by the static load and the dilatational wave during dynamic loading. Although the full-scale tests were successful, the engineering design of the sensor body left room - from the economical point of view - to be optimized. After laboratory tests with the optimized sensor, a cast-in-situ bored pile has been built at the BAM Test Site Technical Safety in Horstwalde, South of Berlin. Additionally to the EFPI sensors, fiber Bragg grating (FBG) sensors, temperature sensors and resistance strain gauge (RSG) sensors are embedded in order to compare the signals with each other. In this paper, the modified sensor and the Setup of the cast-in-situ bored pile along with results of dynamic tests are shown. T2 - SHMII-5 - 5th International conference on structural health monitoring of intelligent infrastructure CY - Cancún, Mexico DA - 11.12.2011 KW - Fibre optic sensors KW - Monitoring KW - Concrete pile KW - Foundation KW - Integrity testing PY - 2011 IS - Topic_04.Cat_4.2-abs002 SP - 1 EP - 8 PB - National Autonomous University of Mexico CY - Mexico City AN - OPUS4-25142 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Hamann, M. A1 - Kubowitz, P. A1 - Habel, Wolfgang A1 - Hofmann, Detlef T1 - Hochleistungsholztragwerke - HHT - Entwicklung von hochbelastbaren Verbundbauweisen im Holzbau mit faserverstärkten Kunststoffen, technischen Textilien und Formpressholz - Aufstockung: Ersteinsatz von optischen Messfasern in Holzbauteilen KW - Holzbau KW - Hochleistungsholztragwerke KW - Verbundbauweise KW - Hybridbauteile KW - Faseroptische Sensorik KW - Faser-Bragg-Gitter KW - Optische Messverfahren KW - Monitoring KW - Brückenbau KW - Bauwerksüberwachung KW - Applizierungstechnologie PY - 2013 SN - 978-3-9815360-8-9 IS - BMBF-Vorhaben 0330722B SP - 1 EP - 103 PB - BAM Bundesanstalt für Materialforschung und -prüfung CY - Berlin AN - OPUS4-27958 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Kusche, Nadine A1 - Schukar, Vivien A1 - Hofmann, Detlef A1 - Basedau, Frank A1 - Habel, Wolfgang A1 - Woschitz, H. A1 - Lienhart, W. ED - Jaroszewicz, L.R. T1 - Field examples for optical fibre sensor condition diagnostics based on distributed fibre-optic strain sensing N2 - Fibre optic sensors for monitoring in safety-relevant structures have to be validated in order to proof their reliability under typical structural load conditions. The reliable use of optical fibre sensors depends strongly on an appropriate and qualitative application. Diagnostics of the physical condition of embedded and surface-applied fibre optic strain sensors are demonstrated on field examples. Distributed strain measurement based on Rayleigh backscattering is used to determine breakage of the fibre, interface adhesion problems and to identify application related strain transfer mechanisms. T2 - EWOFS 2013 - 5th European workshop on optical fibre sensors CY - Kraków, Poland DA - 19.05.2013 KW - Fibre Bragg grating KW - Rayleigh backscattering KW - Condition diagnostics KW - Strain KW - Strain transfer PY - 2013 SN - 978-0-81949-634-8 DO - https://doi.org/10.1117/12.2025567 SN - 0277-786X N1 - Serientitel: Proceedings of SPIE – Series title: Proceedings of SPIE VL - 8794 IS - Paper 8794 - 181 SP - 879433-1 EP - 879433-4 AN - OPUS4-28570 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Habel, Wolfgang A1 - Hofmann, Detlef A1 - Kohlhoff, Harald A1 - Knapp, Jürgen A1 - Brandes, Klaus A1 - Haenichen, H. A1 - Inaudi, D. ED - Inaudi, D. T1 - Complex measurement system for long-term monitoring of prestressed railway bridges of the new "Lehrter Bahnhof" in Berlin T2 - Smart structures and materials 2002 - Smart sensor technology and measurement systems CY - San Diego, CA, USA DA - 2002-03-18 KW - Fiber-optic sensors KW - Monitoring KW - Structure behaviour PY - 2002 SN - 0-8194-4442-1 DO - https://doi.org/10.1117/12.472624 SN - 1605-7422 N1 - Serientitel: SPIE proceedings series – Series title: SPIE proceedings series IS - 4694 SP - 236 EP - 241 PB - SPIE CY - Bellingham, Wash. AN - OPUS4-1456 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Habel, Wolfgang A1 - Hofmann, Detlef A1 - Basedau, Frank A1 - Brandes, Klaus A1 - Barner, Andreas A1 - Crail, S. A1 - Reichel, D. A1 - Schreiner, U. A1 - Ecke, W. ED - Inaudi, D. T1 - Strain monitoring of a newly developed precast concrete track for high speed railway traffic using embedded fiber-optic sensors KW - Railway track system KW - Bonding behaviour KW - Fiber-optic sensor KW - Concrete composites PY - 2002 SN - 0-8194-4442-1 SN - 1605-7422 N1 - Serientitel: SPIE proceedings series – Series title: SPIE proceedings series IS - 4694 SP - 259 EP - 264 PB - SPIE CY - Bellingham, Wash. AN - OPUS4-1457 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Habel, Wolfgang A1 - Hofmann, Detlef A1 - Gutmann, Toivo A1 - Basedau, Frank A1 - Molter, M. A1 - Hegger, J. ED - Inaudi, D. T1 - Characterization of bond performance of textiles in cement matrices using fiber optic sensors T2 - Smart structures and materials 2002 - Smart sensor technology and measurement systems CY - San Diego, CA, USA DA - 2002-03-18 KW - Textile reinforced concrete KW - Fibers KW - Concrete KW - Bond KW - Fiber-optic sensors PY - 2002 SN - 0-8194-4442-1 DO - https://doi.org/10.1117/12.472626 SN - 1605-7422 N1 - Serientitel: SPIE proceedings series – Series title: SPIE proceedings series IS - 4694 SP - 253 EP - 258 PB - SPIE CY - Bellingham, Wash. AN - OPUS4-1458 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hofmann, Detlef A1 - Habel, Wolfgang A1 - Gutmann, Toivo A1 - Basedau, Frank A1 - Molter, M. A1 - Hegger, J. A1 - Will, N. T1 - Untersuchungen an textilbewehrtem Beton PY - 2002 SN - 0025-5300 VL - 44 IS - 5 SP - 194 EP - 198 PB - Carl Hanser Verlag CY - München AN - OPUS4-1474 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Habel, Wolfgang A1 - Hofmann, Detlef A1 - Basedau, Frank A1 - Barner, Andreas A1 - Crail, S. A1 - Reichel, D. A1 - Schreiner, U. A1 - Lindner, E. T1 - Static and dynamic measurements on a newly developed precast concrete track for high speed railway traffic using embedded fiber-optic sensors T2 - International Conference on Force, Mass, Torque, Hardness and Civil Engineering Metrology in the Age Globalization CY - Celle, Germany DA - 2002-09-24 KW - Railway track system KW - Bonding behaviour KW - Fibre-optic sensor KW - Concrete composites PY - 2002 SN - 3-18-091685-0 SN - 0083-5560 N1 - Serientitel: VDI-Berichte – Series title: VDI-Berichte IS - 1685 SP - 147 EP - 152 PB - VDI-Verl. CY - Düsseldorf AN - OPUS4-1755 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Reichel, D. A1 - Schreiner, U. A1 - Lindner, E. A1 - Habel, Wolfgang A1 - Hofmann, Detlef A1 - Basedau, Frank A1 - Barner, Daniel ED - Mencík, J. T1 - Strain Monitoring of a High Speed Railway Track Using Embedded Fibre-Optic Sensors T2 - First International Conference Reliability and Diagnostics of Transport Structures and Means CY - Pardubice, Czech Republic DA - 2002-09-26 PY - 2002 SN - 9788071944645 PB - Univ. CY - Pardubice AN - OPUS4-1725 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hüsken, Götz A1 - Shamsuddoha, Md A1 - Pirskawetz, Stephan A1 - Hofmann, Detlef A1 - Baeßler, Matthias A1 - Kühne, Hans-Carsten T1 - Potential of a Repair System for Grouted Connections in Offshore Structures: Development and Experimental Verification N2 - Grouted connections are intensively used in offshore rigs, platforms as well as jacket and monopile offshore wind turbine structures. Being located in remote offshore conditions, these connections can experience considerable adverse loading during their lifetimes. Degradation was reported inside similar connections, which were installed in the last three decades. Grouting in the offshore sites may often be proven difficult, which eventually leads to reduced load-bearing capacity of connections in the long run. Thus, repair and rehabilitation of such connections should be planned ahead to minimize operational delays and costs. In this study, scaled grouted connections were manufactured using a novel mould, whose integrity were monitored using digital image correlation (DIC). The connections were loaded under static load to visualize the main failure pattern using distributed fibre optic sensors and acoustic emission (AE) analysis. Grouted connections were then repaired using a cementitious injectable grout. The effectiveness of the grout injection was monitored using dye penetration technique. Finally, specimens are reloaded to identify the potential of such repair for grouted connections. KW - Offshore KW - Grouted connection KW - Fibre optic sensors KW - Acoustic emission analysis KW - Cracks KW - Repair KW - Rehabilitation KW - Static loading PY - 2021 DO - https://doi.org/10.1016/j.marstruc.2021.102934 VL - 77 SP - 102934 PB - Elsevier Ltd. AN - OPUS4-52059 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Hofmann, Detlef A1 - Basedau, Frank A1 - Pötschke, Samuel A1 - Breithaupt, Mathias T1 - Funktionsprinzip faseroptischer Sensoren N2 - Das Poster präsentiert die Grundlagen zur Funktionsweise optischer Fasern bzw. faseroptischer Sensoren, die im Rahmen eines Feldversuchs zum Einsatz kommen. T2 - Tag der offenen Tür auf dem Testgelände der BAM (BAM TTS) CY - Horstwalde, Germany DA - 29.09.2018 KW - Faseroptische Sensorik KW - Verteilte Messverfahren KW - Quasi-verteilte Messverfahren PY - 2018 AN - OPUS4-46333 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schilder, Constanze A1 - Kohlhoff, Harald A1 - Hofmann, Detlef A1 - Basedau, Frank A1 - Habel, Wolfgang A1 - Baeßler, Matthias A1 - Niederleithinger, Ernst A1 - Georgi, Steven A1 - Herten, M. ED - Jaroszewicz, L.R. T1 - Static and dynamic pile testing of reinforced concrete piles with structure integrated fibre optic strain sensors N2 - Static and dynamic pile tests are carried out to determine the load bearing capacity and the quality of reinforced concrete piles. As part of a round robin test to evaluate dynamic load tests, structure integrated fibre optic strain sensors were used to receive more detailed information about the strains along the pile length compared to conventional measurements at the pile head. This paper shows the instrumentation of the pile with extrinsic Fabry-Perot interferometers sensors and fibre Bragg gratings sensors together with the results of the conducted static load test as well as the dynamic load Tests and pile integrity tests. T2 - EWOFS 2013 - 5th European workshop on optical fibre sensors CY - Kraków, Poland DA - 19.05.2013 KW - Static load test KW - Dynamic load test KW - Pile integrity test KW - Extrinsic Fabry-Perot interferometer KW - Fibre Bragg grating KW - Structure integrated sensor KW - Fibre optic strain sensor PY - 2013 SN - 978-0-81949-634-8 DO - https://doi.org/10.1117/12.2026813 SN - 0277-786X N1 - Serientitel: Proceedings of SPIE – Series title: Proceedings of SPIE VL - 8794 IS - Paper 8794 - 181 SP - 700 EP - 703 AN - OPUS4-28854 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Lay, Vera A1 - Baensch, Franziska A1 - Johann, Sergej A1 - Sturm, Patrick A1 - Mielentz, Frank A1 - Prabhakara, Prathik A1 - Hofmann, Detlef A1 - Niederleithinger, Ernst A1 - Kühne, Hans-Carsten T1 - SealWasteSafe: materials technology, monitoring techniques, and quality assurance for safe sealing structures in underground repositories N2 - Within the project SealWasteSafe, we advance construction materials and monitoring concepts of sealing structures applied for underground disposal of nuclear or toxic waste. As these engineered barriers have high demands concerning integrity, an innovative alkali-activated material (AAM) is improved and tested on various laboratory scales. This AAM has low reaction kinetics related to a preferential slow release of the heat of reaction in comparison to alternative salt concretes based on Portland cement or magnesium oxychloride cements. Hence, crack formation due to thermally induced strain is reduced. After successful laboratory scale analysis (Sturm et al., 2021), the AAM is characterised on a larger scale by manufacturing test specimens (100–300 L). Conventional salt concrete (DBE, 2004) and the newly developed AAM are compared using two specimen geometries, i.e. cylindrical and cuboid. A comprehensive multisensor monitoring scheme is developed to compare the setting process of AAM and salt concrete for these manufactured specimens. The analysed parameters include temperature and humidity of the material, acoustic emissions, and strain variations. Passive sensor systems based on radiofrequency identification technology (RFID) embedded in the concrete, enable wireless access to temperature and humidity measurements and are compared to conventional cabled systems. Additionally, fibre-optic sensors (FOS) are embedded to record strain, but also have potential to record temperature and moisture conditions. Part of this project aims at demonstrating the high reliability of sensors and also their resistance to highly alkaline environments and to water intrusion along cables or at sensor locations. Further technical improvements were implemented so that first results clearly show the scalability of the setting process from previous small-scale AAM experiments and particularly the high potential of the newly developed approaches. Furthermore, ultrasonic methods are used for quality assurance to detect obstacles, potential cracks and delamination. On the one hand, both active and passive ultrasonic measurements complement the results obtained from the multisensor monitoring scheme for the produced specimens. On the other hand, the unique large aperture ultrasonic system (LAUS) provides great depth penetration (up to nearly 10 m) and can thus be applied at in situ sealing structures built as a test site in Morsleben by the Federal Company for Radioactive Waste Disposal (Bundesgesellschaft für Endlagerung, BGE) as shown by Effner et al. (2021). An optimised field lay-out identified from forward modelling studies and advanced imaging techniques applied to the measured data will further improve the obtained results. To characterise the inside of the test engineered barrier and achieve a proof-of-concept, an ultrasonic borehole probe is developed to enable phased arrays that can further improve the detection of potential cracks. Modelling results and first analysis of semispherical specimens confirmed the reliability of the directional response caused by the phased arrays of the newly constructed ultrasonic borehole probe. Overall, the project SealWasteSafe improves the construction material, multisensor monitoring concepts and ultrasonics for quality assurance. This will help to develop safe sealing structures for nuclear waste disposal. The outcomes are particularly valuable for salt as a host rock but partly also transferrable to alternative conditions. T2 - Safe ND Interdisciplinary research symposium on the safety of nuclear disposal practices CY - Berlin, Germany DA - 10.11.2021 KW - Borehole probe KW - SealWasteSafe KW - Engineered barrier KW - Materials technology KW - Monitoring KW - AAM KW - Ultrasound PY - 2021 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-539172 DO - https://doi.org/10.5194/sand-1-127-2021 VL - 1 SP - 127 EP - 128 PB - Copernicus AN - OPUS4-53917 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Lay, Vera A1 - Mielentz, Frank A1 - Prabhakara, Prathik A1 - Baensch, Franziska A1 - Johann, Sergej A1 - Hofmann, Detlef A1 - Sturm, Patrick A1 - Stamm, Michael A1 - Niederleithinger, Ernst T1 - Multi-sensory monitoring and ultrasound for quality assurance at underground sealing structures N2 - Within the safety concepts of underground disposal sites of nuclear waste, engineered barriers play an important role. As these sealing structures have high demands concerning integrity, we aim at advancing the available construction materials, monitoring, and inspection techniques within the project SealWasteSafe. A specifically developed alkali-activated material is compared to classical salt concrete. A comprehensive multi-sensory monitoring scheme is used at 150-340 l specimens to monitor setting and hardening of both materials. All sensors are demonstrated to resist the highly alkaline environments. Besides cabled and wireless temperature and humidity of the materials, strain variations using fibre optic sensors and acoustic emissions are recorded over periods of at least 28 days, partly for more than eight months. After hardening of the specimens, further nondestructive evaluations using ultrasonic echo and thermographic measurements are conducted. Preliminary results proof the suitability of the tested sensors and clearly highlight differences between the tested materials. Particularly, the newly developed alkali-activated material shows lower acoustic emission activity indicating less cracking activity. Additionally, unique ultrasonic methods will enable better images of potential internal objects and cracks at in-situ sealing structures. A largescale ultrasonic system is optimised to reliably detect objects at a depth exceeding 9 m while still obtaining a good resolution. Modelling studies show the potential of further increasing the distance between individual transducer arrays. Additionally, a new ultrasonic borehole probe using phased arrays allowing for beam focussing is constructed and tested. Laboratory measurements at a halfcylindrical concrete specimen coincide well with the previous modelling. In total, the presented safe materials, detailed monitoring approaches and ultrasonic quality assurance methods will help to obtain safe sealing structures within salt as a host rock. The concepts can partly be transferred to sealing structures in alternative host rocks and will also be valuable for non-nuclear waste repositories. T2 - NDE NucCon CY - Espoo, Finland DA - 25.01.2023 KW - SealWasteSafe KW - Engineered barriers KW - Monitoring KW - Embedded sensors KW - Ultrasonic imaging PY - 2023 SP - 2 EP - 10 AN - OPUS4-56928 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Habel, Wolfgang A1 - Hofmann, Detlef A1 - Basedau, Frank T1 - Rückwirkungsarme faseroptische Dehnungssensoren für weiche Materialien und Verbundwerkstoffe T2 - GESA-Symposium 1999 CY - Warnemünde, Deutschland DA - 1999-05-06 KW - Faseroptische Dehnungssensoren PY - 1999 SN - 3-18-091463-7 SN - 0083-5560 N1 - Sprachen: Deutsch/Englisch - Languages: German/English SP - 103 EP - 112 PB - VDI-Verl. CY - Düsseldorf AN - OPUS4-790 LA - mul AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -