TY - GEN A1 - Liehr, Sascha ED - Mukhopadhyay, S.C. T1 - Polymer optical fiber sensors in structural health monitoring N2 - This chapter summarizes the recent development in the relatively new and emerging field of structural health monitoring using polymer optical fiber (POF) sensors, also referred to as plastic optical fiber sensors. The extraordinary mechanical properties of POF in terms of strainability and ruggedness allows for measurement applications that could not or only insufficiently be solved with existing techniques. A great number of measurement parameters relevant for structural health monitoring applications, such as strain, displacement, crack width, vibrations or moisture can be measured with POF sensors. Numerous sensing principles have been proposed during the last 20 years and the most promising techniques and developments for SHM will be introduced. The focus is on the measurement of physical quantities for early damage detection and propagation, structural surveillance and analysis of dynamic processes. PY - 2011 SN - 978-3-642-21098-3 DO - https://doi.org/10.1007/978-3-642-21099-0 SN - 1876-1100 N1 - Serientitel: Lecture Notes in Electrical Engineering – Series title: Lecture Notes in Electrical Engineering VL - 96 SP - 297 EP - 333 PB - Springer CY - Berlin, Heidelberg AN - OPUS4-24343 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Liehr, Sascha A1 - Krebber, Katerina ED - De Roeck, G. ED - Degrande, G. ED - Lombaert, G. ED - Müller, G. T1 - A novel quasi-distributed long-gauge fiber optic strain sensor system for dynamic measurement N2 - We present a novel technique based on incoherent optical frequency domain reflectometry (OFDR) to measure length changes quasi-distributed between reflection points in optical fibres. The technique enables length changes to be measured with a resolution better than 1 µm and allows for static and dynamic measurement capabilities up to 2 kHz. We demonstrate that dynamic measurements of multiple fibre sections can be conducted independently from each other with high precision. Due to the precise and dynamic measurement capabilities, the proposed sensor system is expected to open new fields of application, especially in the structural-health-monitoring sector. Possible applications are discussed in the paper. T2 - EURODYN 2011 - 8th International conference on structural dynamics CY - Leuven, Belgium DA - 04.07.2011 KW - Distributed sensor KW - Strain sensor KW - Optical fiber sensor KW - Structural health monitoring KW - OFDR KW - Length change measurement KW - Dynamic sensor PY - 2011 SN - 978-90-760-1931-4 SP - 2097 EP - 2102 AN - OPUS4-24347 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Liehr, Sascha T1 - A novel quasi-distributed long-gauge fiber optic strain sensor system for dynamic measurement T2 - 8th International Conference on Structural Dynamics, EURODYN 2011 CY - Leuven, Belgium DA - 2011-07-04 PY - 2011 AN - OPUS4-24776 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Liehr, Sascha T1 - Hangüberwachung mit optischen Polymerfasern T2 - VDI/VDE-GMA Expertenforum "Strukturmonitoring und Zustandsüberwachung 2011" CY - Nuremberg, Germany DA - 2011-06-07 PY - 2011 AN - OPUS4-24777 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Liehr, Sascha T1 - A dynamic fiber optic strain and power change sensor N2 - A dynamic and quasi-distributed sensor principle for simultaneous measurement of length changes and optical power changes between reflection points in an optical fiber is presented. The technique is based on the incoherent optical frequency domain reflectometry (I-OFDR). The calculation of phase and amplitude changes from few measurement points in the frequency domain yields precise and dynamic length and optical power change results up to 2 kHz and μm-resolution. Test results showing the deformation of a masonry building under seismic load are presented. Promising fields of application for this technique are the structural health monitoring sector and chemical process control. T2 - 21st International Conference on Optical Fiber Sensors CY - Ottawa, Canada DA - 15.05.2011 PY - 2011 AN - OPUS4-24930 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Liehr, Sascha T1 - Verteilte faseroptische Sensoren und Anwendung im geotechnischen Monitoring T2 - Faseroptische Sensoren - Messsysteme mit Zukunft CY - Weimar, Germany DA - 2012-09-24 PY - 2012 AN - OPUS4-26793 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Liehr, Sascha T1 - Fiber optic bend and temperature sensing in femtosecond laserstructured POF T2 - 22nd International Conference on Optica Fiber Sensors (OFS-22) CY - Beijing, China DA - 2012-10-15 PY - 2012 AN - OPUS4-27174 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Liehr, Sascha A1 - Burgmeier, J. A1 - Krebber, Katerina A1 - Schade, Wolfgang T1 - Femtosecond laser structuring of polymer optical fibers for backscatter sensing N2 - Focused femtosecond laser pulses are used to create scattering damage in the core of polymer optical fibers (POF). The resulting structures are investigated regarding morphology by light microscopy and backscattered intensity using optical time domain reflectometry (OTDR). Quasi-distributed optical fiber sensing is proposed by evaluating backscatter changes at the inscribed scatter centers. Application examples for quasi-distributed measurement of fiber bends and temperature are demonstrated. KW - Femtosecond laser KW - Micromachining KW - Optical fiber sensors KW - Polymer optical fiber KW - Polymer PY - 2013 DO - https://doi.org/10.1109/JLT.2013.2250483 SN - 0733-8724 SN - 1558-2213 VL - 31 IS - 9 SP - 1418 EP - 1425 PB - Institute of Electrical and Electronics Engineers CY - New York, NY AN - OPUS4-28733 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Liehr, Sascha A1 - Burgmeier, J. ED - Jaroszewicz, L.R. T1 - Quasi-distributed measurement on femtosecond laser-induced scattering voids using incoherent OFDR and OTDR N2 - We propose to use focused femtosecond laser pulses to create scattering damage in standard singlemode optical fibres as reference points for quasi-distributed sensing applications. Such sensor fibres are interrogated with incoherent optical frequency domain reflectometry (I-OFDR) technique and optical time domain reflectometry (OTDR). A performance comparison of both techniques with the clear advantage of the I-OFDR is presented as well as a quasi-distributed length change measurement application. Also dynamic measurement based on the I-OFDR technique is demonstrated on a femtosecond laser-induced sensor chain. T2 - EWOFS 2013 - 5th European workshop on optical fibre sensors CY - Kraków, Poland DA - 19.05.2013 KW - Optical fiber sensors KW - Femtosecond laser KW - Strain sensor KW - OFDR KW - OTDR PY - 2013 SN - 978-0-81949-634-8 DO - https://doi.org/10.1117/12.2026780 SN - 0277-786X N1 - Serientitel: Proceedings of SPIE – Series title: Proceedings of SPIE VL - 8794 IS - Paper 8794 - 181 SP - 87943N-1 EP - 87943N-4 AN - OPUS4-28734 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Liehr, Sascha T1 - Quasi-distributed measurement on femtosecond laser-induced scattering voids using incoherent OFDR and OTDR T2 - 5th European Workshop on Optical Fiber Sensors CY - Kraków, Poland DA - 2013-05-19 PY - 2013 AN - OPUS4-28742 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Liehr, Sascha T1 - Quasi-distributed fiber bend and temperature measurement in femtosecond laser-structured POF T2 - 22nd International Conference on Plastic Optical Fibers CY - Buzios, Brasil DA - 2013-09-11 PY - 2013 AN - OPUS4-29504 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -