Dokument-ID Dokumenttyp Autoren/innen Persönliche Herausgeber/innen Haupttitel Abstract Auflage Verlagsort Verlag Herausgeber (Institution) Erscheinungsjahr Titel des übergeordneten Werkes Jahrgang/Band ISBN Veranstaltung Veranstaltungsort Beginndatum der Veranstaltung Enddatum der Veranstaltung Ausgabe/Heft Erste Seite Letzte Seite URN DOI Lizenz Datum der Freischaltung OPUS4-50381 Zeitschriftenartikel Bartelmeß, Jürgen; Zimmek, David; Bartholmai, Matthias; Strangfeld, Christoph; Schäferling, M. Fibre optic ratiometric fluorescence pH sensor for monitoring corrosion in concrete In this communication a novel concept for pH sensing is introduced which is specifically adapted to monitor carbonation induced corrosion in concrete structures. The method is based on a ratiometric measurement principle, exploiting the pH sensitive colour switching of thymol blue in the basic pH regime and the emissive properties of two different (Zn)CdSe/ZnS core shell quantum dots. The transition point of thymol blue in a Hydrogel D4 matrix was determined to be at around pH 11.6, which fits ideally to the intended application. Next to the fundamental spectroscopic characterization of the ratiometric response, a new design for a sensor head, suitable for the incorporation into concrete matrices is presented. Toward this, a manufacturing process was developed which includes the preparation of a double layer of polymers containing either thymol blue or a quantum dot mixture inside a porous ceramic tube. Results of a proof-of-priciple performance test of the sensor head in solutions of different pH and in cement specimens are presented, with encouraging results paving the way for future field tests in concrete. Royal Society of Chemistry 2020 Analyst 145 6 2111 2117 10.1039/c9an02348h 2020-02-12 OPUS4-25324 Zeitschriftenartikel Bartholmai, Matthias; Goedecke, Thomas Ständig überwacht Mit dem Projekt SIGRID will die BAM Transpondertechnik für Gefahrguttransporte nutzbar machen. München Vogel 2012 Gefahrgut 1 18 19 2016-02-19 OPUS4-35689 Zeitschriftenartikel Bartholmai, Matthias; Kammermeier, Michael; Koeppe, Tabea; Werner, Klaus-Dieter Nicoletto, G.; Pastrama, S.D.; Emri, I. High dynamic measurement of strain and acceleration using a multichannel measuring system with single cable serial connection Strain and acceleration measurement during high dynamic drop tests, e.g., of containments for dangerous goods is performed using high speed multichannel measuring systems. So far established and operated systems need a cable connection of every strain gauge and acceleration sensor with the measuring device, often counting up to a number of more than 100 cables, corresponding to the number of applied sensors. The result is a massive cable harness consisting of all single cables, which is difficult to handle and causes a number of practical problems. An innovative approach is proposed by using a single cable measuring system, consisting of measuring modules with data bus connection and local data acquisition. Promising results were presented in a previous study. This paper follows up with additional results from full-scale testing of a further enhanced single cable system for the application in drop tests. Elsevier Ltd. 2016 Materials Today: Proceedings 3 32nd DANUBIA ADRIA SYMPOSIUM on Advances in Experimental Mechanics Starý Smokovec, Slovakia 22.09.2015 25.09.2015 4 931 935 10.1016/j.matpr.2016.03.023 2016-04-14 OPUS4-28963 Zeitschriftenartikel Bartholmai, Matthias; Kammermeier, Michael; Werner, Klaus-Dieter; Köppe, Tabea Single cable, multichannel measuring system for heavy load, high impact drop tests Multichannel measuring systems are used to measure strains and accelerations during drop tests of containments for dangerous goods. Conventional systems require cabling of each sensor and co-falling of the cable harness, causing problems in the test preparation and execution. Promising results of a single cable measuring system, consisting of measuring modules with data bus connection and local data acquisition were presented in a previous study. This paper follows up with results from laboratory and full-scale testing of an further enhanced single cable system for the application in drop tests.---------------------------------------------------------------------------------------------------------------------------------------------------------------- Vielkanalmesssysteme werden zur Messung von Dehnungen und Beschleunigungen bei Fallversuchen von Gefahrstoffbehältern eingesetzt. Konventionelle Systeme erfordern die Verkabelung jeder einzelnen Messstelle und somit das Mitfallen eines Kabelbaums, wodurch Probleme bei der Versuchsvorbereitung und Durchführung entstehen. In einer vorangegangenen Studie wurden vielversprechende Ergebnisse durch Verwendung eines 1-Kabelmesssystems mit Datenbus und dezentraler Datenspeicherung erzielt. Dieser Artikel beinhaltet weiterführende Ergebnisse aus Labor- und Realversuchen mit einem weiterentwickelten System zur Anwendung bei Fallversuchen. München Oldenbourg 2013 Technisches Messen 80 7-8 249 255 10.1524/teme.2013.0033 2016-02-20 OPUS4-32509 Zeitschriftenartikel Bartholmai, Matthias; Köppe, Enrico; Neumann, Patrick P. Monitoring of hazardous scenarios using multi-sensor devices and sensor data fusion The combination of different types of sensors to multi-sensor devices offers excellent potential for monitoring applications. This should be demonstrated by means of four different examples of actual developments carried out by Federal Institute for Materials Research and Testing (BAM): monitoring and indoor localization of relief forces, a micro-drone for gas measurement in hazardous scenarios, sensor-enabled radio-frequency identification (RFID) tags for safeguard of dangerous goods, and a multifunctional sensor for spatially resolved under-surface monitoring of gas storage areas. Objective of the presented projects is to increase the personal and technical safety in hazardous scenarios. These examples should point to application specific challenges for the applied components and infrastructure, and it should emphasize the potential of multi-sensor systems and sensor data fusion. [S.l.] IARIA 2014 International journal on advances in systems and measurements 7 3/4 193 200 2016-02-20 OPUS4-24652 Zeitschriftenartikel Bartholmai, Matthias; Neumann, Patrick P. Adaptive ortsaufgelöste Gaskonzentrationsmessung mit einer Mikrodrohne München Oldenbourg 2011 Technisches Messen 78 10 470 478 10.1524/teme.2011.0158 2016-02-19 OPUS4-29070 Zeitschriftenartikel Bartholmai, Matthias; Neumann, Patrick P. Fliegende Aufspürer - Gasmessung und Gasquellenlokalisierung mit einer Mikrodrohne Darmstadt Succidia AG, Verl. und Kommunikation 2013 Chemie & more : Prozesstechnik 4 30 33 2016-02-20 OPUS4-28910 Zeitschriftenartikel Bartholmai, Matthias; Neumann, Patrick P.; Lazik, D. Multifunctional sensor for monitoring of CO2 underground storage by comprehensive and spatially resolved measuring of gas concentrations, temperature and structural changes One of the main unsolved issues of CCS is the comprehensive surveillance of CO2 storage areas with reasonable effort and costs. This study presents an approach for distributed subsurface monitoring of gas storage areas. The concept combines different measurement technologies to one multifunctional sensor: membrane based measurement technology for in situ monitoring of gases in soil and fibre optical sensing of temperature and strain (as a measure for structural change). A test field of application-relevant dimensions is built up to validate and optimize the technology. Amsterdam Elsevier 2013 Energy procedia 37 GHGT 11 - Greenhouse gas control technologies conference Kyoto, Japan 2012-11-18 2012-11-22 4033 4040 10.1016/j.egypro.2013.06.303 2016-02-20 OPUS4-3706 Zeitschriftenartikel Bartholmai, Matthias; Schartel, Bernhard Layered silicate polymer nanocomposites: new approach or illusion for fire retardancy? Investigations of the potentials and the tasks using a model system Polymeric nanocomposites are discussed as one of the most promising advanced materials whose nanoscale effects can be exploited for industry. Layered silicate polypropylene-graft-maleic anhydride nanocomposites are investigated as a model to clarify the potential of such materials in terms of fire retardancy. The nanostructure is characterized using transmission electron microscopy (TEM) and shear viscosity. The fire behavior is characterized using different external heat fluxes in cone calorimeter, limiting oxygen index and UL 94 classification. A comprehensive fire behavior characterization is presented which enables an assessment of the materials' potential with respect to different fire scenarios and fire tests. The influence of morphology and the active mechanisms are discussed, such as barrier formation and changed melt viscosity. To our knowledge, it is the first attempt to illuminate the concept's strengths, such as the reduction of flame spread, and weaknesses, such as the lack of influence on ignitability, in a clear, comprehensive and detailed manner. Chichester John Wiley & Sons, Ltd. 2004 Polymers for advanced technologies 15 7 355 364 2016-02-19 OPUS4-14645 Zeitschriftenartikel Bartholmai, Matthias; Schartel, Bernhard Assessing the performance of intumescent coatings using bench-scaled cone calorimeter and finite difference simulations A method was developed to assess the heat insulation performance of intumescent coatings. The method consists of temperature measurements using the bench-scaled experimental set-up of a cone calorimeter and finite difference simulation to calculate the effective thermal conductivity dependent on time/temperature. This simulation procedure was also adapted to the small scale test furnace, in which the standard time-temperature curve is applied to a larger sample and thus which provides results relevant for approval. Investigations on temperature and calculated effective thermal conduction were performed on intumescent coatings in both experimental set-ups using various coating thicknesses. The results correspond to each other as well as showing the limits of transferability between both fire tests. It is shown that bench-scaled cone calorimeter tests are a valuable tool for assessing and predicting the performance of intumescent coatings in larger tests relevant for approval. The correlation fails for processes at surface temperatures above 750°C, which are not reached in the cone calorimeter, but are attained in the small scale furnace set-up. London Heyden 2007 Fire and materials 31 3 187 205 2016-02-19