TY - CONF A1 - Lohse, Volkmar A1 - Negendank, Detlef A1 - Buschbeck, Gerd T1 - Explosionsschutz mit Gaswarngeräten T2 - Internationale Fachmesse für Explosionsschutz und Anlagensicherheit CY - Nürnberg, Deutschland DA - 2001-03-27 PY - 2001 AN - OPUS4-1695 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Lohse, Volkmar A1 - Negendank, Detlef A1 - Buschbeck, Gerd T1 - Explosionsschutz - Gaswarngeräte im Geltungsbereich der Richtlinie 94/9/EG T2 - Internationale Fachmesse für Explosionsschutz und Anlagensicherheit CY - Nürnberg, Deutschland DA - 2001-03-27 PY - 2001 AN - OPUS4-1696 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Lohse, Volkmar A1 - Negendank, Detlef T1 - Explosionsschutz mit Gaswarngeräten - Die BAM als notifizierte Stelle für Richtlinie 94/9/EG T2 - ExploRisk 2002 CY - Nürnberg, Deutschland DA - 2002-10-08 PY - 2002 AN - OPUS4-1699 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Lohse, Volkmar A1 - Negendank, Detlef T1 - Gemeinsame BAM- und PTB-Dienstleistung - Konformitäts-Bewertungsverfahren für Gaswarngeräte T2 - ExploRisk 2002 CY - Nürnberg, Deutschland DA - 2002-10-08 PY - 2002 AN - OPUS4-1700 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Negendank, Detlef A1 - Lohse, Volkmar T1 - Stand der Normung zu Gaswarngeräten für den Einsatz im industriellen Bereich T2 - Fachtagung NAMUR "Analysenmesstechnik", MSA Auer CY - Berlin, Germany DA - 2012-05-23 PY - 2012 AN - OPUS4-25885 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Nooke, Alida A1 - Beck, Uwe A1 - Hertwig, Andreas A1 - Krause, Andreas A1 - Krüger, Hannes A1 - Lohse, Volkmar A1 - Negendank, Detlef A1 - Steinbach, J. T1 - On the application of gold based SPR sensors for the detection of hazardous gases N2 - A gas sensor system based on the surface plasmon resonance (SPR) effect in a 44 nm Au layer was studied. The usability of this sensor system was investigated for several analyte gases and gas mixtures which are interesting due to their flammability, toxicity or greenhouse effect. The SPR effect of gold was measured in nitrogen and compared with the gaseous alkane series which caused a shift of the position of the SPR effect. For in situ measurements, the phase shift Δ at the SPR angle (ψ minimum) in the analyte gas mixtures was measured for investigated gases in comparison with nitrogen. With this method, detection limits of different gases could be determined, which lie in a range interesting for safety engineering. Furthermore the aging effect of the gold layers which leads to loss in sensitivity of the sensor was investigated. KW - Ellipsometry KW - SPR effect KW - Gas sensing KW - Gold layer PY - 2010 U6 - https://doi.org/10.1016/j.snb.2010.05.061 SN - 0925-4005 SN - 1873-3077 VL - 149 IS - 1 SP - 194 EP - 198 PB - Elsevier CY - Amsterdam [u.a.] AN - OPUS4-21673 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Rauchegger, Christian A1 - Schmidt, Dirk A1 - Lohse, Volkmar A1 - Negendank, Detlef A1 - Thévenin, D. T1 - Experimentelle Untersuchungen zur Schwergasausbreitung T2 - 10. Fachtagung Anlagen-, Arbeits- und Umweltsicherheit CY - Köthen, Deutschland DA - 2010-11-04 KW - Schwergas KW - Sensortechnik KW - Experimentelle Daten PY - 2010 SN - 978-3-89746-119-2 IS - Paper M-02 SP - 1 EP - 10 CY - Frankfurt/M. AN - OPUS4-22350 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Negendank, Detlef A1 - Lohse, Volkmar T1 - Gaswarnsysteme in der Sicherheitstechnik - Anforderungen an Messfunktion und funktionale Sicherheit T2 - 12. BAM/PTB-Kolloquium zu Fragen der chemischen und physikalischen Sicherheitstechnik, BAM CY - Berlin, Germany DA - 2010-06-15 PY - 2010 AN - OPUS4-21006 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Nooke, Alida A1 - Beck, Uwe A1 - Hertwig, Andreas A1 - Krause, Andreas A1 - Krüger, Hannes A1 - Lohse, Volkmar A1 - Negendank, Detlef A1 - Steinbach, J. T1 - Ellipsometric detection of gases with the surface plasmon resonance effect on gold top-coated with sensitive layers N2 - An ellipsometric gas sensor based on the surface Plasmon resonance (SPR) effect of ~ 43 nm thick gold layers was investigated. To protect the gold layer from contamination and to improve the detection limits, the gold layers were top-coated with 5–6 nm thick layers of organic a-C:H or with inorganic metal oxides TiO2 or ZrO2. The additional layers increased the long-term stability, whereas the metal oxide layers protect better than a-C:H. Furthermore, the additional layers decreased the detection limits by one order of magnitude in case of a-C:H and two orders of magnitude in case of the oxides. It could be shown that the detection limits also depend on the kind of preparation (sol–gel process or physical vapour deposition) of the additional layers. KW - Gas sensor KW - SPR KW - Ellipsometry KW - Sensitive layer KW - TiO2 KW - ZrO2 KW - a-C:H PY - 2011 U6 - https://doi.org/10.1016/j.tsf.2010.11.091 SN - 0040-6090 VL - 519 IS - 9 SP - 2659 EP - 2663 PB - Elsevier B.V. CY - Amsterdam AN - OPUS4-23353 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Lohse, Volkmar A1 - Negendank, Detlef A1 - Thedens, M. T1 - Gaswarnsysteme für den Explosionsschutz - Anforderungen an Explosionsschutz, Messfunktion und funktionale Sicherheit N2 - Gaswarnsysteme, aber auch einfachere Gaswarngeräte und -anlagen, finden in der Industrie breite Anwendung zur Gefahrenabwehr in explosionsgefährdeten Bereichen im Sinne der Richtlinie 94/9/EG (ATEX 95). Hierfür werden meist Geräte zur Konzentrationsmessung von brennbaren Gasen mit einem Messbereich von 0 % bis 100 % der jeweiligen UEG eingesetzt. Ziel ist die rechtzeitige und zuverlässige Warnung vor unzulässig hohen Brenngaskonzentrationen unter Betriebsbedingungen. Sauerstoffmessgeräte, die bestimmungsgemäß für die Überwachung von Inertisierungsmaßnahmen verwendet werden, unterliegen ebenfalls den besonderen Anforderungen der ATEX-Richtlinie. KW - Gaswarnsysteme KW - Explosionsschutz KW - Messfunktion KW - Funktionale Sicherheit KW - ATEX PY - 2011 SN - 0030-834X VL - 121 IS - 1 SP - 30 EP - 33 PB - Wirtschaftsverl. NW CY - Bremerhaven AN - OPUS4-23716 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Fischer, Daniel A1 - Hertwig, Andreas A1 - Beck, Uwe A1 - Negendank, Detlef A1 - Lohse, Volkmar A1 - Kormunda, M. A1 - Esser, N. T1 - Dependence of the optical constants and the performance in the SPREE gas measurement on the thickness of doped tin oxide over coatings N2 - In this study, thickness related changes of the optical properties of doped tin oxide were studied. Two different sets of samples were prepared. The first set was doped with iron or nickel on silicon substrate with thicknesses of 29–56 nm, the second was iron doped on gold/glass substrate with 1.6–6.3 nm. The optical constants were determined by using spectral ellipsometry (SE) followed by modelling of the dielectric function with an oscillator model using Gaussian peaks. The analysis of the optical constants shows a dependence of the refraction and the absorption on the thickness of the doped tin oxide coating. In addition to the tin oxide absorption in the UV, one additional absorption peak was found in the near-IR/red which is related to plasmonic effects due to the doping. This peak shifts from the near-IR to the red part of the visible spectrum and becomes stronger by reducing the thickness, probably due to the formation of metal nanoparticles in this layer. These results were found for two different sets of samples by using the same optical model. Afterwards the second sample set was tested in the Surface Plasmon Resonance Enhanced Ellipsometric (SPREE) gas measurement with CO gas. It was found that the thickness has significant influence on the sensitivity and thus the adsorption of the CO gas. By increasing the thickness from 1.6 nm to 5.1 nm, the sensing ability is enhanced due to a higher coverage of the surface with the over coating. This is explained by the high affinity of CO molecules to the incorporated Fe-nanoparticles in the tin oxide coating. By increasing the thickness further to 6.3 nm, the sensing ability drops because the layer disturbs the SPR sensing effect too much. T2 - 7th International Conference on Spectroscopic Ellipsometry (ICSE-7) DA - 06.06.2016 KW - Surface plasmon resonance KW - Spectroscopic ellipsometry KW - Doped tin oxide KW - Gas sensing KW - Plasmonic absorption PY - 2017 U6 - https://doi.org/10.1016/j.apsusc.2016.11.188 SN - 0169-4332 VL - 421, Teil B SP - 480 EP - 486 PB - Elsevier B.V. AN - OPUS4-42692 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -