TY - JOUR A1 - Appajaiah, Anilkumar A1 - Wachtendorf, Volker A1 - Daum, Werner T1 - Characterization of thermo-oxidative stability of polymer optical fibers using chemiluminescence technique N2 - The thermo-oxidative stability of commercially available polymer optical fibers (POFs) and their components (cores and claddings) was investigated. All the bare POFs (core and cladding only) studied here were based on poly(methyl methacrylate) (PMMA) core. The fibers were exposed to 100 °C/low humidity for about 4200 h. Chemiluminescence (CL) technique was applied to investigate the thermo-oxidative stability and for measuring the transmission loss during exposure a prototype device called multiplexer was used. POFs exhibited variation in thermo-oxidative stability although they possessed identical core material PMMA. This was due to difference in the chemical compositions of claddings. Claddings were more susceptible to the thermo-oxidative degradation compared to cores. The thermo-oxidative degradation of both the cladding and the core was found in POFs as a result of climatic exposure. POFs showed an early drop-off followed by a slow decline of transmission. The early drop-off of transmission was attributed to physical changes like thermal expansion and the slow decline of transmission to chemical changes like oxidative degradation of POFs. A good linear relationship between optical transmission stability and thermo-oxidative stability of POFs was established from these studies. KW - Polymer optical fibers (POFs) KW - Chemiluminescence (CL) KW - Thermo-oxidative stability KW - Aging KW - Optical transmission stability PY - 2006 DO - https://doi.org/10.1016/j.polymdegradstab.2006.05.006 SN - 0141-3910 SN - 1873-2321 VL - 91 IS - 11 SP - 2605 EP - 2613 PB - Applied Science Publ. CY - London AN - OPUS4-13984 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Daum, Werner ED - Czichos, Horst ED - Tetsuya Saito, ED - Leslie Smith, T1 - Structural Health Monitoring - Embedded Sensors KW - Measurement Methods for Composition and Structure KW - Measurement Methods for Material Properties KW - Measurement Methods for Material Performance, Modelling and Simulation Methods PY - 2006 SN - 978-3-540-20785-6 IS - Part D / 16.6 SP - 875 EP - 890 PB - Springer CY - Berlin AN - OPUS4-13985 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Daum, Werner T1 - Sensorik und Messtechnik für die Zustandsüberwachung T2 - GESA-Expertenforum 2007 "Experimentelle Strukturanalyse für die Zustandsüberwachung" CY - Nuremberg, Germany DA - 2007-06-23 PY - 2007 AN - OPUS4-14875 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Ziemann, O. A1 - Krauser, J. A1 - Zamzow, P. E. A1 - Daum, Werner T1 - POF-Handbuch - Optische Kurzstrecken-Übertragungssysteme PY - 2007 SN - 978-3-540-49093-7 SP - 1 EP - 880 PB - Springer CY - Berlin ET - 2. AN - OPUS4-15812 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Czichos, Horst A1 - Daum, Werner ED - Grote, K.-H. ED - Feldhusen, J. T1 - Meßtechnik und Sensorik KW - Energietechnik KW - Fertigung KW - Heiz- und Klimatechnik KW - Konstruktion KW - Maschinenbau KW - Mess- und Regelungstechnik KW - Verfahrenstechnik PY - 2007 SN - 978-3-540-49714-1 IS - Kap. W SP - W1 EP - W37 PB - Springer CY - Berlin AN - OPUS4-15764 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Brandes, Klaus A1 - Daum, Werner A1 - Buchhardt, Frank T1 - Monitoring of Bridges by Advanced Methods of Experimental - Mechanical Symbiosis T2 - International Association for Bridge and Structural Engineering (IABSE) Symposium 2007 CY - Weimar, Deutschland DA - 2007-09-19 KW - Long-term monitoring KW - Sensors KW - Experimental-analytical symbiosis KW - Bridges KW - Lagrangian Multipliers KW - Structural modelling PY - 2007 SN - 978-3-85748-116-1 VL - 93 SP - 1 EP - 8 CY - Weimar AN - OPUS4-16327 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Brandes, Klaus A1 - Daum, Werner A1 - Buchhardt, Frank ED - Paulo J.S. Cruz, ED - Dan M. Frangopol, ED - Luis C. Neves, T1 - Long-term monitoring of concrete bridges by direct combination of experimental and mechanical analysis T2 - 3. International Conference on Bridge Maintenance, Safety and Management "Bridge Maintenance, Safety, Management, Life-Cycle Performance and Cost", IABMAS `06 CY - Porto, Portugal DA - 2006-07-16 PY - 2006 SN - 978-0-415-40315-3 SP - 1 EP - 8 PB - Taylor & Francis CY - Leiden, The Netherlands AN - OPUS4-16395 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Brandes, Klaus A1 - Daum, Werner T1 - Langzeit-Monitoring an den Spannbetonbrücken des neuen Hauptbahnhofs Berlin (Lehrter Bahnhof) N2 - Spannbetonbrücken des neuen Hauptbahnhofs in Berlin, die etwa 170 m lang sind und auf 12 Stützen ruhen, werden für viele Jahre mit einem Monitorsystem überwacht. Gemessen werden langzeitig auftretende Setzungen und Hebungen an den Auflagerpunkten. Für die Messungen wird ein hydrostatisches und ein laseroptisches System für die vertikalen Verformungen eingesetzt, daneben Neigungsmesser und Dehnungsaufnehmer (elektrische und faseroptische) sowie Temperatur-Sensoren. Für die Auswertung wird eine neuartige Symbiose von experimenteller und mechanisch-numerischer Analyse angewendet. PY - 2008 SN - 0002-5968 VL - 1 SP - 21 EP - 28 PB - Wichmann CY - Heidelberg AN - OPUS4-16590 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Ziemann, O. A1 - Krauser, J. A1 - Zamzow, P. E. A1 - Daum, Werner T1 - POF handbook - Optical short range transmission systems PY - 2008 SN - 978-3-540-76628-5 DO - https://doi.org/10.1007/978-3-540-76629-2 SP - 1 EP - 880 PB - Springer CY - Berlin ET - 2. AN - OPUS4-16699 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Daum, Werner ED - Czichos, Horst ED - Saito, T. ED - Smith, L. T1 - Structural Health Monitoring - Embedded Sensors PY - 2011 SN - 978-3-642-16640-2 SP - 932 EP - 949 PB - Springer CY - Berlin, Heidelberg AN - OPUS4-24180 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -