Papers by Matthias Bartholmai
Berlin 2007 D 83 Kurzfassung Ziel der vorliegenden Arbeit war die Untersuchung und Bewertung von ... more Berlin 2007 D 83 Kurzfassung Ziel der vorliegenden Arbeit war die Untersuchung und Bewertung von zwei unterschiedlichen Flammschutzkonzepten polymerer Baustoffe. Dabei steht das Cone Calorimeter als vielseitiges Instrument in dem Forschungsbereich Brandverhalten und Flammschutz von Werkstoffen und Bauteilen im Mittelpunkt der Betrachtungen. Das Cone Calorimeter zeichnet sich durch eine mittlere Probendimension (100 x 100 mm 2 ) aus. Es simuliert die Phase der Flammenausbreitung eines realen Brandverlaufs. Sowohl die Leistungsfähigkeit der untersuchten Materialsysteme als auch die Möglichkeiten und Grenzen der Untersuchungsmethode waren von Interesse. Die wissenschaftliche Aussagekraft von Cone Calorimeter-Ergebnissen wurde in Hinblick auf unterschiedliche Brandszenarien und Probendimensionen eingehend geprüft. Polymer-Schichtsilikat-Nanocomposites sind ein neues Konzept für flammgeschützte Werkstoffe, die aus einer Polymermatrix und der Zugabe eines nanoskaligen Schichtsilikat-Additivs von ca. 5 Gew.-% bestehen. Im Brandfall bilden die Schichtsilikate eine Barriereschicht aus, die den Wärmetransport in das Material bzw. den Stofftransport der Pyrolysegase aus dem Material behindert. Anhand eines Modellsystems wurde gezeigt, dass dieser Barriereeffekt eine deutliche Verbesserung des Brandverhaltens hinsichtlich der Flammenausbreitung bewirkt, jedoch in anderen Brandszenarien bzw. Brandphasen wirkungslos ist. Die Ergebnisse der Cone Calorimeter-Untersuchungen wurden mit Ergebnissen der Entflammbarkeitstests UL 94 und LOI verglichen. Es wurde eine Korrelation in Richtung kleinerer Probendimensionen (downscale) und in Richtung der Phase der Brandentstehung aufgezeigt. Die Anwendung intumeszierender Beschichtungen auf Bauteile verschiedener Art, wie z.B. tragende Stahlkonstruktionen, ist ein etabliertes Brandschutzkonzept. Das intumeszierende Polymermaterial schäumt unter Wärmeeinwirkung auf und bildet eine wärmeisolierende Schutzschicht. Es wurde ein Verfahren basierend auf Temperaturmessung im Cone Calorimeter und Simulationsrechnung entwickelt, mit dem diese Wirkungsweise bewertet werden konnte. Die Untersuchungsergebnisse wurden mit Ergebnissen aus Kleinprüfstanduntersuchungen verglichen. Eine Korrelation in Richtung größerer Probendimensionen (upscale) und in Richtung der Phase des voll entwickelten Brandes konnte bis zu einer Temperaturlimitierung gezeigt werden.
Energy Procedia, 2013
ABSTRACT One of the main unsolved issues of CCS is the comprehensive surveillance of CO2 storage ... more ABSTRACT 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.
Comprehensive monitoring of pipelines over their full length is technically difficult and expensi... more Comprehensive monitoring of pipelines over their full length is technically difficult and expensive. Considering a cost-benefit ratio it is reasonable to implement monitoring solutions in pipeline segments, which bear a high risk potential, like residential areas, construction sites, slopes, street or river crossings. Still such segments can measure up to several hundred meters in length, demanding for monitoring solutions that extend along such distances and enable fast response. Point wise sensing and periodical surveillance have clear drawbacks, particularly regarding early damage detection. Fibre optic sensors enable distributed sensing of temperature and strain, but they offer very limited possibilities for measuring gas concentrations. Linear membrane-based gas sensors enable the monitoring of gas concentrations alongside a pipeline. Such line-sensors are implemented in form of flexible tubes and can be arranged inside or outside the pipeline (also underwater or within the sub...
IEEE SENSORS 2014 Proceedings, 2014
tm - Technisches Messen, 2009
Polymer Degradation and Stability, 2005
The cone calorimeter has become one of the most important and widely used instruments for the res... more The cone calorimeter has become one of the most important and widely used instruments for the research and development of fire retarded polymeric materials. The paper addresses three important ways in which the principal setup influences the results — factors which sometimes do not receive due consideration when drawing conclusions. The paper discusses in detail the impact on cone calorimeter
Energy Procedia, 2013
Carbon capture & storage (CCS) is one of the most promising technologies for greenhouse gas (GHG)... more Carbon capture & storage (CCS) is one of the most promising technologies for greenhouse gas (GHG) management. However, an unsolved issue of CCS is the development of appropriate long-term monitoring systems for leak detection of the stored CO 2 . To complement already existing monitoring infrastructure for CO 2 storage areas, and to increase the granularity of gas concentration measurements, a quickly deployable, mobile measurement device is needed. In this paper, we present an autonomous gas-sensitive micro-drone, which can be used to monitor GHG emissions, more specifically, CO 2 . Two different measurement strategies are proposed to address this task. First, the use of predefined sensing trajectories is evaluated for the task of gas distribution mapping using the micro-drone. Alternatively, we present an adaptive strategy, which suggests sampling points based on an artificial potential field (APF). The results of real-world experiments demonstrate the feasibility of using gas-sensitive micro-drones for GHG monitoring missions. Thus, we suggest a multi-layered surveillance system for CO 2 storage areas.
The Federal Institute for Materials Research and Testing and the company AirRobot GmbH & Co. KG c... more The Federal Institute for Materials Research and Testing and the company AirRobot GmbH & Co. KG cooperate to develop a flying remote-controlled measuring system. The system is capable of operating in a variety of scenarios of gas emission, e.g. exhaust gas from a chimney, flue gas in case of a fire, gas emission in case of an accident of chemical or hazardous goods or in case of a terrorist act involving toxic gases. Another addressed field of application is spatially resolved emission control of geodynamic active regions, waste disposals, stockpiles, CO 2 storage areas (CCS), industrial sites and pollution critical areas. Due to its mobility the system can measure the gas concentration in the immediate vicinity of the object which causes the emission. A further stage of extension is to enhance the system for plume-tracking and identification of gas sources.
tm - Technisches Messen, 2013
ABSTRACT
Outline motivation gas source localization (GSL) with particle filter (PF) o non-uniformity o... more Outline motivation gas source localization (GSL) with particle filter (PF) o non-uniformity of the wind field o PF-based GSL algorithm » measurement model » update step » resampling step » estimation of the gas source location experiments o simulation o real-world conclusion future work
Advanced Robotics
Gas source localization (GSL) with mobile robots is a challenging task due to the unpredictable n... more Gas source localization (GSL) with mobile robots is a challenging task due to the unpredictable nature of gas dispersion, the limitations of the currents sensing technologies, and the mobility constraints of ground-based robots. This work proposes an integral solution for the GSL task, including source declaration. We present a novel pseudo-gradient-based plume tracking algorithm and a particle filter-based source declaration approach, and apply it on a gas-sensitive micro-drone. We compare the performance of the proposed system in simulations and real-world experiments against two commonly used tracking algorithms adapted for aerial exploration missions.
Sensor Letters
In this paper, we show that a micro unmanned aerial vehicle (UAV) equipped with commercially avai... more In this paper, we show that a micro unmanned aerial vehicle (UAV) equipped with commercially available gas sensors can address environmental monitoring and gas source localization (GSL) tasks. To account for the challenges of gas sensing under real-world conditions, we present a probabilistic approach to GSL that is based on a particle filter (PF). Simulation and real-world experiments demonstrate the suitability of this algorithm for micro UAV platforms.
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Papers by Matthias Bartholmai