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 OPUS4-28518 Beitrag zu einem Tagungsband Bartholmai, Matthias; Neumann, Patrick P.; Kohlhoff, Harald; Daum, Werner Multi-sensor systems for safety-related monitoring AMA Service GmbH 2013 Sensor 2013 - 16th International conference on sensors and measurement technology (Proceedings) 978-3-9813484-3-9 Sensor 2013 - 16th International conference on sensors and measurement technology Nürnberg, Germany 2013-05-14 2013-05-16 268 272 10.5162/sensor2013/B5.2 2016-02-20 OPUS4-26004 Beitrag zu einem Tagungsband Neumann, Patrick P.; Bennetts, V.H.; Bartholmai, Matthias Adaptive gas source localization strategies and gas distribution mapping using a gas-sensitive micro-drone Wunstorf AMA Service GmbH 2012 16. ITG/GMA-Fachtagung - Sensoren und Messsysteme 2012 978-3-9813484-0-8 16. GMA/ITG-Fachtagung 'Sensoren und Messsysteme' Nürnberg, Germany 2012-05-22 2012-05-23 800 809 10.5162/sensoren2012/P5.4 2016-02-19 OPUS4-26008 Beitrag zu einem Tagungsband Prager, Jens; Köppe, Enrico; Bartholmai, Matthias Früherkennung von Strukturschäden mittels geführter Lamb-Wellen Eine Reihe von Prüfproblemen in der chemischen Industrie, in Kraftwerksanlagen und in Transportsystemen ist aufgrund schwieriger Zugangsmöglichkeiten nur begrenzt technisch bzw. wirtschaftlich effizient durchführbar. Das hier vorgestellte Projekt beinhaltet die Entwicklung eines Verfahrens der zerstörungsfreien Prüfung über weite Entfernungen (bis zu 100 m), das zum Einsatz in automatisierten Messsystemen bzw. zur Integration in Langzeitüberwachungssysteme geeignet ist. Grundlage des Verfahrens ist die gezielte Anregung und Auswertung von Lamb-Wellenmoden, wodurch eine effektive Unterscheidung von Fehler- und Formanzeigen sowie eine Klassifizierung unterschiedlicher Fehlertypen möglich werden. Der Vorteil der Nutzung geführter Wellen für die zerstörungsfreie Prüfung liegt in ihrer vergleichsweise guten Ausbreitungsfähigkeit über weite Entfernungen. Die sich daraus ergebenden Möglichkeiten der Untersuchung großer bzw. schwer zugänglicher Bereiche einer Struktur bieten innovative Ansätze für die Entwicklung robuster Structural-Health-Monitoring-Systeme (SHM). Erst durch die Verfügbarkeit leistungsfähiger Rechentechnik wird ein breiter Einsatz derartiger Verfahren möglich. Die Technik kann zur Materialcharakterisierung an ebenen bzw. zylindrischen, dünnwandigen Flächen aus Metall oder auch CFK genutzt werden. Adressierte Anwendungsfelder sind z.B. die Untersuchung von Flugzeugtragflächen oder Pipelines. Des Weiteren wird der Einsatz solcher Verfahren zur Überwachung sicherheitsrelevanter Bauteile z.B. aus Laminaten angestrebt, wie sie verstärkt in der Luft- und Raumfahrt Anwendung finden. Im Rahmen des Projekts wurde auf Grundlage vorhandener Technik (Wellenanregung mittels Ultraschall-Gruppenstrahlprüfköpfen) ein umfassendes Verständnis für die Technologie und anwendungsrelevante Parameter (Probenmaterial und -dimensionen, Welleneigenschaften, Anregungs-, Transmissions-, Reflektionscharakteristika) gewonnen und Algorithmen zur Erkennung von Schädigungsbildern (z.B. Riss, Loch, Verdünnung) entwickelt. Neben der Algorithmusentwicklung zur Detektion und Analyse von Schadstellen, lag ein Projektschwerpunkt in der Entwicklung einer geeigneten Gerätetechnik. Als sensorisches Elemente wurde Ultraschall-Gruppenstrahlertechnik eingesetzt. Besondere Anforderungen werden an die Technik zur Anregung der Wellenmoden unter Verwendung geeigneter Piezoaktoren gestellt. In diesem Bereich existiert bislang keine kommerziell erhältliche Gerätelösung, weshalb eine Neuentwicklug der Anregetechnik realisiert wurde. Speziell für die hohe Anzahl an Aktorkanälen, die benötigt wird, um unterschiedliche Moden und Wellenformen anzuregen, wurde eine äußerst leistungsfähige Anregeeinheit entwickelt. Wunstorf AMA Service GmbH 2012 16. ITG/GMA-Fachtagung - Sensoren und Messsysteme 2012 978-3-9813484-0-8 16. GMA/ITG-Fachtagung 'Sensoren und Messsysteme' Nürnberg, Germany 22.05.2012 23.05.2012 531 540 10.5162/sensoren2012/5.2.1 2016-02-19 OPUS4-26009 Beitrag zu einem Tagungsband Köppe, Tabea; Werner, Klaus-Dieter; Kammermeier, Michael; Bartholmai, Matthias Temperaturabhängige hochdynamische Untersuchungen des Systems Dehnungsmessstreifen/Klebstoff Dehnungsmessstreifen (DMS) gehören zu den Standardsensoren beim Messen mechanischer Größen. Sie finden Ihre Anwendung auf unterschiedlichen Gebieten, als sensorische Komponente in Messaufnehmern (z.B. Wägezelle, Kraftaufnehmer) oder für Dehnungsmessungen im Bereich der Strukturüberwachung unter anderem an Brücken oder Bauwerken. Sie werden in verschiedenen Größen geliefert und mit entsprechenden Klebstoffen auf der Objektoberfläche des Messobjekts an der jeweiligen Messstelle angebracht und an das Messsystem angeschlossen. Dieser Aufbau wird bei den verschiedenen Anwendungen unterschiedlichen Temperaturen und Umwelteinflüssen ausgesetzt. Dabei wird das System DMS/Klebstoff in seinen Eigenschaften verändert und das Ergebnis der Dehnungsmessung beeinflusst. Beispielsweise kann es zu einer Verfälschung der Messergebnisse kommen, wenn der Klebstoff die Dehnung des Messobjekts nicht vollständig auf den DMS überträgt, oder es kann eine Nullpunktverschiebung der Dehnungsmessung auftreten. An der Bundesanstalt für Materialforschung und -prüfung werden Fallversuche von Lager- und Transportbehältern durchgeführt. Für diese werden Dehnungsmessstreifen auf den Behälter angebracht um die Dehnung bzw. Verformung zu messen. Bei den Versuchen werden verschiedene Parameter berücksichtigt: Neben unterschiedlichen Fallhöhen (u.a. 9 m und 1 m) wird auch der Temperatureinfluss auf den Fallversuch z.B. bei -40 °C oder +100 °C untersucht. Zur Applizierung von DMS auf Objektoberflächen gibt es für verschiedene Anwendungsbedingungen (DMS-Typ, Objektoberflächenbeschaffenheit, Einsatztemperatur) von den DMS-Herstellern jeweils empfohlene Klebstoffe. Insbesondere für Anwendungsfälle mit hochdynamischer Belastung (Fallversuche, Crash-Tests) und großem Temperaturbereich ist es erforderlich, dass die Dehnungsmessstreifen zuverlässige Werte ausgeben. Dies ist nur gegeben, wenn der Klebstoff eine gute Verbindung zwischen Messobjekt und Dehnungsmessstreifen herstellt. Wunstorf AMA Service GmbH 2012 16. ITG/GMA-Fachtagung - Sensoren und Messsysteme 2012 978-3-9813484-0-8 16. GMA/ITG-Fachtagung 'Sensoren und Messsysteme' Nürnberg, Germany 2012-05-22 2012-05-23 435 442 10.5162/sensoren2012/4.1.4 2016-02-19 OPUS4-26027 Beitrag zu einem Tagungsband Köppe, Tabea; Werner, Klaus-Dieter; Kammermeier, Michael; Bartholmai, Matthias Jirousek, O.; Kytýr, D. Temperature-dependent dynamic analysis of the system strain gauge/adhesive CTU Czech Technical University in Prague 2012 XIIIth Bilateral Czech/German Symposium - Experimental Methods and Numerical Simulation in Engineering Sciences (Proceedings) 978-80-01-05062-0 XIIIth Bilateral Czech/German symposium - Experimental methods and numerical simulation in engineering sciences Telc, Czech Republic 2012-06-05 2012-06-08 1 99 102 2016-02-19 OPUS4-26028 Beitrag zu einem Tagungsband Köppe, Enrico; Bartholmai, Matthias; Liers, A.; Schiller, J. Radio-based multi-sensor system for person tracking and indoor positioning Sensor based person tracking is a challenging topic. The main objective is positioning in areas without GPS connection, i.e. indoors. A research project is carried out at BAM, Federal Institute for Materials Research and Testing, to develop and to validate a multi-sensor system for 3D localization. It combines body motion sensing and a guard system for the tracking and recording of the status of persons. The so named BodyGuard system was designed for sensor-based monitoring and radio-based transmission of the movement of a person. Algorithms were developed to transform the sensor data into a spatial coordinate. This paper describes how the BodyGuard system operates, which main components were used in the system, how the individual sensor data are converted into 3D motion data, with which algorithms the individual sensors are processed, how individual errors are compensated and how the sensor data are merged into a 3D Model. Final objective of the BodyGuard system is to determine the exact location of a person in a building, e.g. during fire-fighting operations. Dresden Hochschule für Technik und Wirtschaft Dresden 2012 WPNC 2012 - 9th Workshop on positioning, navigation and communication WPNC '12 - 9th Workshop on positioning, navigation and communication 2012 Dresden, Germany 2012-03-15 2012-03-16 PS 11 1 7 2016-02-19 OPUS4-28652 Beitrag zu einem Tagungsband Neumann, Patrick P.; Wosniok, Aleksander; Lazik, D.; Bartholmai, Matthias Test field for the validation of a multifunctional sensor for distributed subsurface monitoring of gas storage areas BAM Federal Institute for Materials Research and Testing, in cooperation with the company MeGaSen UG carries out a research project to enhance and validate an innovative approach for distributed subsurface monitoring of gas storage areas. The concept combines different measurement technologies to one multifunctional sensor: membrane-based gas measurement technology for in-situ monitoring of gases in soil and fiber optical sensing of temperature and strain (as a measure for structural change). Key aspect of the research project is the first-time validation of the system in an application relevant dimension. For this purpose a 20 x 20 m2 test field is build. A comprehensive validation of the system is carried out by systematic variation of different parameters like position-dependent gasinjection, temperature and mechanical impact. AMA Service GmbH 2013 Sensor 2013 - 16th International conference on sensors and measurement technology (Proceedings) 978-3-9813484-3-9 Sensor 2013 - 16th International conference on sensors and measurement technology Nürnberg, Germany 14.05.2013 16.05.2013 713 716 10.5162/sensor2013/P2.2 2016-02-20 OPUS4-24537 Beitrag zu einem Tagungsband Neumann, Patrick P.; Asadi, S.; Schiller, J.H.; Lilienthal, A.J.; Bartholmai, Matthias An artificial potential field based sampling strategy for a gas-sensitive micro-drone This paper presents a sampling strategy for mobile gas sensors. Sampling points are selected using a modified artificial potential field (APF) approach, which balances multiple criteria to direct sensor measurements towards locations of high mean concentration, high concentration variance and areas for which the uncertainty about the gas distribution model is still large. By selecting in each step the most often suggested close-by measurement location, the proposed approach introduces a locality constraint that allows planning suitable paths for mobile gas sensors. Initial results in simulation and in real-world experiments with a gas-sensitive micro-drone demonstrate the suitability of the proposed sampling strategy for gas distribution mapping and its use for gas source localization. IEEE 2011 IEEE/RSJ International conference on intelligent robots and systems (IROS '11) / Workshop on robotics for environmental monitoring (WREM2011) IEEE/RSJ International conference on intelligent robots and systems (IROS '11) / Workshop on robotics for environmental monitoring (WREM2011) San Francisco, CA, USA 25.09.2011 30.09.2011 34 38 2016-02-19 OPUS4-24401 Beitrag zu einem Tagungsband Köppe, Enrico; Bartholmai, Matthias Tsamis, C.; Kaltsas, G. Wireless sensor network with temperature compensated measuring technology for long-term structural health monitoring of buildings and infrastructures Damage to buildings occurs if a construction component fails. The result is a partial or total collapse which can be dangerous for people for example if it's a bridge or a large hall. The collapse of the terminal building at the Airport Charles de Gaulle in Paris and the damage at the historic City Archives of Cologne are typical examples of such accidents. Another problem is the contradiction of the increasing volume of traffic (particularly heavy traffic) and the great age of bridges. The probability increases that the load-bearing capacity of a bridge decreases. For example the collapses of the Mississippi Bridge and of the Inntal Motorway Bridge can be seen as results. Therefore it is necessary to control endangered structures during their life span. In order to prevent these kinds of accidents, the Federal Institute for Materials Research and Testing developed a radio-based, self-configuring measuring system in cooperation with the ScatterWeb Company, Berlin (Germany). This measuring system consists of identically designed sensor modules which are self-sustaining, wireless, act as transmitters and receivers and are equipped with a special sensor technology for long-term monitoring of buildings or engineering facilities. The sensor unit uses strain gauges for stress analysis and contains interfaces for additional sensors. The system in particular applies to buildings and structures for transport and traffic and large-scale industrial facilities, where a subsequent wiring installation is difficult or impossible. Elsevier Demokritos - National Center for Scientific Research 2011 Eurosensors XXV (Proceedings) Eurosensors XXV Athens, Greece 04.09.2011 07.09.2011 Paper 1197 1 5 2016-02-19 OPUS4-24402 Beitrag zu einem Tagungsband Köppe, Enrico; Bartholmai, Matthias; Liers, A.; Schiller, J. Tracking persons using a radio-based multi-sensor system A multi-sensor system for 3D localization was developed and named BodyGuard. It combines body movement sensing and a guard system for the tracking and recording of the status of persons. BodyGuard was designed to monitor and transmit the movement of a person radio-based and to transform that data into a spatial coordinate. This paper describes how the BodyGuard system works, what components the system consists of, how the individual sensor data is converted into 3D motion data, with which algorithms the individual sensors are processed, how individual errors are compensated and how the sensor data are fused into a 3D Model. 2011 IPIN 2011 - International conference on indoor positioning and indoor navigation IPIN 2011 - International conference on indoor positioning and indoor navigation Guimaraes, Portugal 21.09.2011 23.09.2011 1 4 2016-02-19 OPUS4-27552 Beitrag zu einem Tagungsband Köppe, Enrico; Bartholmai, Matthias; Prager, Jens Device concept for the generation of guided waves for early damage detection In this study a method for early damage detection is investigated based on the directed excitation and measuring of Lamb waves (guided waves). The objective is to make a statement about the practicability of a Lamb wave generator (LWG) and about the application relevant parameters (specimen materials and dimensions, wave characteristics, excitation, transmission und reflection). Guided waves enable an effective differentiation of structural and defective indications as well as a classification of different defect types. For the investigations, a LWG was developed which combines the advantages of the single excitation of a piezoelectric actuator and the possibility of a group excitation. Algorithms were developed to identify and analyze damage patterns (cracks, wholes, weakening). Elsevier 2012 Eurosensors XXVI (Proceedings) / Procedia Engineering 47 Eurosensors XXVI Kraków, Poland 2012-09-09 2012-09-12 1185 1188 10.1016/j.proeng.2012.09.363 2016-02-20 OPUS4-26240 Beitrag zu einem Tagungsband Bartholmai, Matthias; Köppe, Enrico; Prager, Jens Boller, C. Early damage detection of structural defects using guided waves Limited access to the object of relevance is often an essential problem in testing routines, e.g. for non-destructive testing of industry facilities or components of means of transportation. The presented project is about the development of a non-destructive testing method for application over great distances (up to 100 m). The method is based on directed excitation and measuring of Lamb waves (guided waves). It enables an effective differentiation of structural and defective indications as well as a classification of different defect types. The advantage of guided waves is the ability of propagation over great distances. This offers innovative possibilities for the investigation of large or difficult to access constructions. The testing method can be helpful in a broad variety of applications. It is useable for the characterization of plane or cylindrical, thin-walled surfaces of metal or fiber laminated materials. Particularly the investigation of aircraft wings and other aerospace components as well as the investigation of pipelines are addressed fields of application. Berlin Deutsche Gesellschaft für Zerstörungsfreie Prüfung e.V. 2012 EWSHM'12 - 6th European workshop on structural health monitoring 2012 (Proceedings) 2 978-3-940283-41-2 EWSHM'12 - 6th European workshop on structural health monitoring 2012 Dresden, Germany 03.07.2012 06.07.2012 1471 1478 2016-02-19 OPUS4-4068 Beitrag zu einem Tagungsband Schartel, Bernhard; Bartholmai, Matthias; Braun, Ulrike Residue, Charring and Intumescence The exploration of condensed phase mechanisms such as charring and intumescence has been pushed forward in the last decades, since it is believed that focusing on these concepts will bring materials closer to an efficient and ecologically friendly fire retardancy. They promise to concentrate efficient fire retardancy at the key position between pyrolysis zone and gas phase. Examples of residue/char forming and intumescent materials are used to illustrate the influence of mass and heat barrier effects on the fire behavior of materials and general results are presented. A comprehensive understanding of the mechanisms and structure-property relationships in fire retardancy is presented. Norwalk, Conn. BCC Research 2006 Proceedings of the Conference on Recent Advances in Flame Retardancy of Polymeric Materials : volume XVII XV 1-59623-221-8 15 21 2016-02-19 OPUS4-29069 Beitrag zu einem Tagungsband Bartholmai, Matthias; Köppe, Enrico; Neumann, Patrick P. Monitoring of hazardous scenarios using multi-sensor devices IARIA - International academy, research, and industry association 2013 Sensordevices 2013 - The 4th International conference on sensor device technologies and applications 978-1-61208-297-4 Sensordevices 2013 - The 4th International conference on sensor device technologies and applications Barcelona, Spain 2013-08-25 2013-08-31 9 13 2016-02-20 OPUS4-29093 Beitrag zu einem Tagungsband Neumann, Patrick P.; Bartholmai, Matthias Mikrodrohne zur Gefährdungsbeurteilung im Einsatz in Gasfreisetzungsszenarien Systementwicklung und Validierung o Motivation o Stand der Technik o Realisierung o Systemkomponenten o Integration o Gastransport o Windvektorbestimmung Anwendungsbeispiele o Mikrodrohne im Einsatz o Lokalisierung von Emissionsquellen o Erstellung von Gasverteilungskarten Landesamt für Arbeitsschutz, Gesundheitsschutz und technische Sicherheit Berlin (LAGetSi) 2013 KAT 14 - 14. Berliner Katastrophenschutzforum KAT 14 - 14. Berliner Katastrophenschutzforum Berlin, Germany 12.09.2013 12.09.2013 1 22 2016-02-20 OPUS4-19748 Beitrag zu einem Tagungsband Bartholmai, Matthias; Köppe, Enrico Urs Meier, ; Bernadette Havranek, ; Masoud Motavalli, Wireless sensor network for long-term structural health monitoring of buildings and infrastructures Damage commonly occurs in buildings when a component fails suddenly with a partial or total collapse as a consequence. This type of event leads to serious damage to property and if it is a bridge or a large hall, then people in particular are at risk. The often great age of bridges and the increasing volume of traffic (particularly heavy traffic) which they are expected to carry are in clear contradiction to each other. Thus the probability increases that the loadbearing capacity of a bridge decreases rapidly and often unnoticed with sometimes dire consequences. In order to prevent such accidents, the Federal Institute for Materials Research and Testing is currently developing a special radio-based, self-configuring measuring system in cooperation with the Berlin-based ScatterWeb Company. This measuring system consists of a number of identically designed sensor nodes which are self-sustaining, need no wiring, can act as both transmitters and receivers and are equipped with a special sensor technology making long-term monitoring of buildings or engineering facilities possible. The sensor unit uses strain gauges for stress analysis and contains interfaces for additional sensors. The system in particular applies to buildings and structures for transport and traffic and large-scale industrial facilities, where a subsequent wiring installation is difficult or impossible. International society for structural health monitoring of intelligent infrastructure 2009 4th International conference on structural health monitoring of intelligent infrastructure 4th International conference on structural health monitoring of intelligent infrastructure Zurich, Switzerland 2009-07-22 2009-07-24 Paper 365 1 5 2016-02-19 OPUS4-22313 Beitrag zu einem Tagungsband Goedecke, Thomas; Pettelkau, Alexander; Hohendorf, Stefan; Damm, David; Bartholmai, Matthias; Farahbakhsh, Mahin Goedecke, T. Securing of dangerous goods transports by RFID-tags with sensor-functionality and integrated database "GEFAHRGUT" information (SIGRID) The project SIGRID investigates and assesses possibilities to enhance the safety and security of dangerous goods transports through the use of the latest RFID-technology. This technology can be used to greatly enhance the transparency of the supply chain and aid logistics companies in complying with regulations. In the context of SIGRID, customized RFID-Sensor-Tags have been developed that monitor dangerous goods during transport and help to prevent hazards by allowing timely countermeasures. In the case of a dangerous goods accident, the available information about the type, amount and condition of the dangerous goods can be used to accurately inform the relief forces. Unavailable or inaccurate information represents a significant problem for the relief forces. This often leads to a delay in the rescue operation, because relief forces must be aware of the substances involved to protect themselves effectively against them. SIGRID aims to close this information gap. To verify the practicability of the underlying concepts, a demonstrator will be build and tests of realistic scenarios will be conducted. Scientific research publishing International association of packaging research institutes (IAPRI) 2010 17th IAPRI World conference on packaging (Proceedings) 978-1-935068-36-5 17th IAPRI World conference on packaging Tianjin, China 2010-10-12 2010-10-15 639 642 2016-02-19 OPUS4-26638 Beitrag zu einem Tagungsband Köppe, Tabea; Bartholmai, Matthias; Daum, Werner Ognjanovic, M.; Stankovic, M.; Ristic, M. Introduction in the system of the split Hopkinson pressure bar and validation of the method The Split Hopkinson Pressure Bar (SHPB) or Kolsky Bar is known as a method for analysing mechanical properties of a material under dynamic load. Referring to the name it is a splitted Hopkinson Pressure Bar. The Hopkinson Bar is related to its inventor Bertram Hopkinson (1914). He used it to analyze stone samples under dynamic load. Later his construction was improved by Davies (1948) [1] and Kolsky (1949) [2], who had the idea to split the bar and put a sample in between. The technique is used to measure a lot of different mechanical properties of a material e.g. the dynamic Young’s modulus, deformation behaviour or to chart the dynamic stress-strain diagram. Further applications are the measurement of the elastic wave and the analysis of the propagation of the wave [2]. In the last years there was still an interest in measuring dynamic properties with a SHPB. Nevertheless no comprehensive validation of the system exists. Another problem is that the stress and the strain in the sample are only calculated with simplified estimations. The aim of this paper is to give a first impression of important points validating the system. On account of different setups of the SHPB a validation of the used system is necessary. Hence it is important to look at the theory. Further in this paper the measurement results will be shown in a strain over time diagram. Belgrade, Serbia University of Belgrade 2012 DAS-29 - 29th Danubia-Adria-symposium on advances in experimental mechanics (Proceedings) 978-86-7083-762-1 DAS-29 - 29th Danubia-Adria-symposium on advances in experimental mechanics Belgrade, Serbia 2012-09-26 2012-09-29 52 53 2016-02-19 OPUS4-28878 Beitrag zu einem Tagungsband Neumann, Patrick P.; Schnürmacher, M.; Bennetts, V.H.; Lilienthal, A.J.; Bartholmai, Matthias; Schiller, J.H. A probabilistic gas patch path prediction approach for airborne gas ource localization in non-uniform wind fields 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 for GSL that is based on a particle filter (PF). Simulation and real-world experiments demonstrate the suitability of this algorithm for micro UAV platforms. International society for olfaction and chemical sensing (ISOCS) 2013 ISOEN 2013 - 15th International symposium on olfaction and electronic nose (Proceedings) ISOEN 2013 - 15th International symposium on olfaction and electronic nose Deagu, South Korea 02.07.2013 05.07.2013 Symposia / Applications of remote and local gas sensing ... 15 16 2016-02-20 OPUS4-56462 Beitrag zu einem Tagungsband Johann, Sergej; Winkler, Nicolas P.; Bartholmai, Matthias Kourkoulis, S. K. Multi-sensor system for long-term monitoring with WiFi and LoRaWAN technology In many cases, science falls back on self-developed prototype systems, which are used and developed for the measurement and execution of the tasks. About 80 % of the development is based on the same hardware design, which is used in only one application scenario and then discarded. For the most part, there are also uncalibrated sensors, since it is costly to calibrate a complicated sensor measurement system or the entire measurement chain since access to the sensor systems is not always available. This paper describes a conceptual design to implement a versatile sensor system with the motivation to fuse the data recording and data reception, which can cover large areas with the help of LoRaWAN (Long Range Wide Area Network) technology. To overcome disadvantages of LoRaWAN, namely the slow data rates, the proposed sensor system can also cover smaller areas with the widespread WiFi technology. An enormous advantage over individual complete systems in the form of a prototype, is the rapid expansion, uncomplicated calibration of the individual sensors and the ecological relief. A modular design is used, where individual stacks with sensors and peripherals can be added separately. The stacks are standalone low-power systems and can be calibrated, maintained, and replaced separately and do not require the entire measurement chain. The measured and sent values are stored locally on the main stack and sent to the data collector (gateway) and evaluated by means of the automated selection between WiFi and LoRaWAN. Greek Society of Experimental Mechanics of Materials 2022 38th Danubia-Adria Symposium on Advances in Experimental Mechanics - Extended abstracts 38th Danubia-Adria Symposium on Advances in Experimental Mechanics Athens, Greece 20.09.2022 23.09.2022 1 2 2022-12-05 OPUS4-56574 Beitrag zu einem Tagungsband Moufid, M.; Tiebe, Carlo; El Bari, N.; Bartholmai, Matthias; Bouchikhi, B. Advance in electronic nose technology developed for the detection and discrimination of ethanol, ammonia, and hydrogen sulfide gases This work focuses on the design and fabrication of low-cost and fast-response of an electronic nose (E-nose) based on semiconductor gas sensors, for discriminating some synthetic gases such as ammonia (NH3), ethanol (C2H5OH), and hydrogen sulfide (H2S). Additionally, the capability of separating different concentration levels of each considered gases was checked. Dataset treatment of E-nose by using Principal Component Analysis (PCA) showed a good discrimination of the different synthetic gases. Furthermore, perfect classification was reached of different concentration levels of the analysed gases by using Discriminant Function Analysis (DFA). In the light of these results, it could be stated that the developed E-nose system constitutes an inexpensive, rapid, simple to use, and efficient tool for synthetic gases detection. 2022 IEEE International symposium on olfaction and electronic nose (ISOEN 2022) 978-1-6654-5860-3 IEEE International Symposium on Olfaction and Electronic Nose (ISOEN) Aveiro, Portugal 29.05.2022 01.06.2022 1 3 10.1109/ISOEN54820.2022.9789636 2022-12-19 OPUS4-54400 Beitrag zu einem Tagungsband Moufid, M.; Tiebe, Carlo; El Bari, N.; Bartholmai, Matthias; Bouchikhi, B. Characterization of Unpleasant Odors in Poultry Houses Using Metal Oxide Semiconductor-Based Gas Sensor Arrays and Pattern Recognition Methods In this study, the ability of an electronic nose developed to analyze and monitor odor emissions from three poultry farms located in Meknes (Morocco) and Berlin (Germany) was evaluated. Indeed, the potentiality of the electronic nose (e-nose) to differentiate the concentration fractions of hydrogen sulfide, ammonia, and ethanol was investigated. Furthermore, the impact change of relative humidity values (from 15% to 67%) on the responses of the gas sensors was reported and revealed that the effect remained less than 0.6%. Furthermore, the relevant results confirmed that the developed e-nose system was able to perfectly classify and monitor the odorous air of poultry farms. MDPI 2021 The 1st International Electronic Conference on Chemical Sensors and Analytical Chemistry) 5 1st International Electronic Conference on Chemical Sensors and Analytical Chemistry Online meeting 01.07.2021 15.07.2021 52 1 7 urn:nbn:de:kobv:b43-544005 10.3390/CSAC2021-10481 https://creativecommons.org/licenses/by/4.0/deed.de 2022-02-28 OPUS4-54401 Beitrag zu einem Tagungsband Moufid, M.; Tiebe, Carlo; El Bari, N.; Bartholmai, Matthias; Bouchikhi, B. Combining of TD-GC-MS and home developed electronic nose for road traffic air monitoring In this work, we demonstrate the ability of an electronic nose system based on an array of six-semiconductor gas sensors for outdoor air quality monitoring over a day at a traffic road in downtown of Meknes city (Morocco). The response of the sensor array reaches its maximum in the evening of the investigated day which may due to high vehicular traffic or/and human habits resulting in elevated concentrations of pollutants. Dataset treatment by Principal Component Analysis and Discriminant Function Analysis shows a good discrimination between samples collected at different times of the day. Moreover, Support Vector Machines were used and reached a classification success rate of 97.5 %. Thermal Desorption-Gas Chromatography-Mass Spectrometry (TD-GC-MS) technique was used to validate the developed e-nose system by identifying the composition of the analyzed air samples. The discrimination obtained by e-nose system was in good agreement with the TD-GC-MS results. This study demonstrates the usefulness of TD-GC-MS and e-nose, providing high accuracy in discriminating outdoor air samples collected at different times. This demonstrates the potential of using the e-nose as a rapid, easy to use and inexpensive environmental monitoring system. 2021 2021 IEEE International Conference on Design & Test of Integrated Micro & Nano-Systems (DTS) 2021 IEEE International Conference on Design & Test of Integrated Micro & Nano-Systems (DTS) Sfax, Tunisia 07.06.2021 10.06.2021 1 6 10.1109/DTS52014.2021.9498110 2022-02-28 OPUS4-53933 Beitrag zu einem Tagungsband Neumann, Patrick P.; Hirschberger, Paul; Bartholmai, Matthias Flying Ant Robot - Aerial Chemical Trail Detection and Localization This paper presents first advances in the area of aerial chemical trail following. For that purpose, we equipped a palm-size aerial robot, based on the Crazyflie 2.0 quadrocopter, with a small lightweight metal oxide gas sensor for measuring evaporated ethanol from chemical trails. To detect and localize the chemical trail, a novel detection criterion was developed that uses only relative changes in the transient phase of the sensor response, making it more robust in its application. We tested our setup in first crossing-trail experiments showing that our flying ant robot is able to correlate an odor hit with the chemical trail within 0.14 m. Principally, this could enable aerial chemical trail following in the future. IEEE 2021 Proceedings of the IEEE Sensors 2021 IEEE Sensors 2021 Online meeting 31.10.2021 04.11.2021 1 4 10.1109/sensors47087.2021.9639857 2021-12-08 OPUS4-53409 Beitrag zu einem Tagungsband Neumann, Patrick P.; Hirschberger, Paul; Bartholmai, Matthias Holl, H. Aerial Chemical-Trail Detection and Localization This paper presents first advances in the area of aerial chemical trail following. For that purpose, we equipped a palm-size aerial robot, based on the Crazyflie 2.0 quadrocopter, with a small lightweight metal oxide gas sensor for measuring evaporated ethanol from chemical trails. To detect and localize the chemical trail, a novel detection criterion was developed that uses only relative changes in the transient phase of the sensor response, making it more robust in its application. We tested our setup in first crossing-trail experiments showing that our flying ant robot is able to correlate an odor hit with the chemical trail within 0.14 m. Principally, this could enable aerial chemical trail following in the future. Johannes Kepler University, Linz, Austria 2021 37th Danubia - Adria Symposium on Advances in Experimental Mechanics: Extendet abstracts 2021 978-3-9504997-0-4 37th Danubia - Adria Symposium on Advances in Experimental Mechanics Linz, Austria 21.09.2021 24.09.2021 39 40 2021-09-29 OPUS4-52576 Beitrag zu einem Tagungsband Gawlitza, Kornelia; Johann, Sergej; Mansurova, Maria; Kohlhoff, Harald; Tiebe, Carlo; Bell, Jérémy; Bartholmai, Matthias; Rurack, Knut Semi-automatic Measurement Device for Long-Term Monitoring of Ammonia in Gas Phase In the present paper the development of a semi-automated device for long-term monitoring of gaseous ammonia is described. A sensor material was produced that changes its optical properties in the pres-ence of low concentrations of ammonia in air. The implementation into an electronic device enables precise, simple, economic and fast monitoring of low concentrations of harmful gases, like ammonia, and hence can help to improve the climate monitoring in livestock housing, barns or stables. 2021 SMSI 2021 Proceedings SMSI 2021 Online meeting 03.05.2021 06.05.2021 133 134 2021-05-06 OPUS4-52649 Beitrag zu einem Tagungsband Johann, Sergej; Tiebe, Carlo; Kohlhoff, Harald; Bartholmai, Matthias Feasibility Study for Safe Workplaces through automation and digitalization technology with redesigned Smart Sensors and LoRaWAN Monitoring System This project addresses the application of safe and healthy workplaces in offices, chemical laboratories and other workplaces where indoor air quality plays an important role. The LoRaWAN (Long Range Wide Area Network) is used as a communication interface to make sensor data globally accessible. The objectives of the project are to create a sensor node and an online and offline system that collects the data from the sensor nodes and stores it on a local server, in a cloud, and also locally on the node to prevent communication failures. An important point in this project is the development of the sensor nodes and the placement of these in the premises, thus no development work is involved in Building the infrastructure. 2021 SMSI 2021 Proceedings SMSI 2021 Online meeting 03.05.2021 06.05.2021 230 231 2021-05-17 OPUS4-37129 Beitrag zu einem Tagungsband Bartholmai, Matthias; Johann, Sergej; Kammermeier, Michael; Müller, Maximilian; Strangfeld, Christoph RFID sensor systems embedded in concrete - systematical investigation of the transmission characteristics Long-term completely embedded sensor systems offer innovative possibilities for structural health monitoring of concrete structures. Measuring of relevant parameters, e.g., temperature, humidity, or indication of corrosion can be performed with low energy sensors. This allows to implement passive RFID sensor systems without cable connection and battery, which are power supplied exclusively by the electromagnetic field from the external reader device. To evaluate characteristics and conditions of this concept, a systematical investigation of the transmission characteristics with variation of relevant parameters, as communication frequency, installation depth, type of concrete, moisture content, etc. is currently carried out in an interdisciplinary research project at BAM. First results are presented in this paper. 2016 8th European Workshop On Structural Health Monitoring 8th European Workshop On Structural Health Monitoring Bilbao, Spain 05.07.2016 08.07.2016 1 5 2016-08-15 OPUS4-36817 Beitrag zu einem Tagungsband Strangfeld, Christoph; Johann, Sergej; Müller, Maximilian; Bartholmai, Matthias Moisture Measurements with RFID based Sensors in Screed and Concrete To quantify the moisture in concrete, RFID based humidity sensors are embedded. Passive high frequency, ultra-high frequency RFID tags as well as active Bluetooth sensors are tested. After concreting, all sensors measure the corresponding relative humidity to monitor the concrete moisture. Two case studies are performed, embedding in an existing construction, i.e. the duraBASt test bridge, and embedding in cement based mortar in the laboratory. As basis for robust and long-life sensors in alkaline concrete, different casing materials are tested. Furthermore, signal strength measurements and their sensitivity to different moisture levels are performed. 2016 8th European Workshop On Structural Health Monitoring 8th European Workshop On Structural Health Monitoring Bilbao, Spain 05.07.2016 08.07.2016 1 10 2016-07-12 OPUS4-37535 Beitrag zu einem Tagungsband Johann, Sergej; Strangfeld, Christoph; Müller, Maximilian; Bartholmai, Matthias Aulova, Alexandra; Rogelj Ritonja, Alenka; Emri, Igor RFID sensor systems embedded in concrete - requirements for long-term operation One of the more difficult tasks for structural health monitoring is the continuous evaluation of the stability and load capacity of the building materials. This knowledge can be won, e.g., by taking material samples at the examining place with the drawback of partly destroying the structure. To avoid this, modern sensor and communication technologies offer promising methods for non-destructive testing. To address the tasks for monitoring of concrete structures, in the presented study, different sensors were combined with RFID transponders and embedded in concrete components. Ljubljana Narodna in univerzitetna knjižnica, Ljubljana 2016 33rd Danubia - Adria Symposium on Advances in Experimental Mechanics - Book of abstracts 978-961-94081-0-0 33rd Danubia - Adria Symposium on Advances in Experimental Mechanics Portorož, Slovenia 20.09.2016 23.09.2016 68 69 2016-09-28 OPUS4-30727 Beitrag zu einem Tagungsband Lazik, D.; Ebert, Sebastian; Neumann, Patrick P.; Bartholmai, Matthias Pipeline monitoring with linear gas sensors 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 subsurface), corresponding to the technical requirements. The measuring method combines the gas specific diffusion rates through a membrane with Dalton's law of partial pressures and enables the calculation of gas concentrations or the detection of a change of the gas composition. The objective is to detect gas leakages fast and with high reliability. Furthermore, the calibrated system enables to estimate the spatial extent of a leakage. So far the gas concentration measurement is tested for oxygen, carbon dioxide, methane; further gases should follow, e.g. hydrogen, carbon monoxide or mixtures like natural gas. The paper introduces in the different operating modes of line-sensors. A near real-time approach will be demonstrated to quantify the impact of a gas leak on the near environment. This approach is based on a critical length describing the expansion of the leaking gas. 2014 9th Pipeline technology conference 2014 (Proceedings) 9th Pipeline technology conference 2014 Berlin, Germany 12.05.2014 14.05.2014 1 9 2016-02-20 OPUS4-32083 Beitrag zu einem Tagungsband Bartholmai, Matthias; Neumann, Patrick P.; Werner, Klaus-Dieter; Ebert, Sebastian; Lazik, D. Linear sensor for areal subsurface gas monitoring - calibration routine and validation experiments Membrane based linear gas sensors and fiber optical sensors feature similar geometries and complement each other in quantities to be measured. To the author's best knowledge, it is the first time that these sensors are combined to a multifunctional sensor for distributed measuring of gas concentrations, temperature, and strain. Objective is a comprehensive monitoring of underground gas storage areas. In the presented project a 400 m² test site and a corresponding laboratory system were just built up to characterize, validate, and optimize the combined sensor. Application of the sensor lines in a grid structure should enable spatial resolution of the measurement data and early detection of relevant events, as gas leakage, temperature change, or mechanical impact. A Calibration routine was developed which can be applied subsequent to underground installation. First measurement results indicate the potential of the method, with regard to highly topical energy transport and storage issues. Institute of Electrical and Electronics Engineers (IEEE) 2014 IEEE Sensors 2014 conference (Proceedings) 978-1-4799-0161-6 IEEE Sensors 2014 conference Valencia, Spain 02.11.2014 05.11.2014 942 945 10.1109/ICSENS.2014.6985157 2016-02-20 OPUS4-30990 Beitrag zu einem Tagungsband Bartholmai, Matthias; Stoppel, Markus; Petrov, Sergej; Hohendorf, Stefan; Goedecke, Thomas Two application examples of RFID sensor systems - Identification and diagnosis of concrete components and monitoring of dangerous goods transports The combination of radio-frequency identification (RFID) tags with different types of sensors offers excellent potential for applications with regard to identification, diagnosis, and monitoring. This should be demonstrated by means of two examples of actual developments carried out by the Federal Institute for Materials Research and Testing (BAM). The Identification and diagnosis of concrete components is a major task in the maintenance of critical infrastructure, for instance concrete bridges with heavy traffic volume. A feasibility study investigates the application of RFID sensor systems for this task. The second example reviews the transportation of dangerous goods. Using modern technologies enables promising possibilities to reduce accidents and to avoid non-conformity with transportation regulations. Project results demonstrate an innovative technical solution for monitoring of dangerous goods transports with RFID sensor systems. IMEKO - International measurement confederation 2014 13th IMEKO TC10 Workshop on technical diagnostics (Proceedings) 978-92-990073-3-4 13th IMEKO TC10 Workshop on technical diagnostics Warsaw, Poland 26.04.2014 27.06.2014 ID 0019, 111 115 2016-02-20 OPUS4-30859 Beitrag zu einem Tagungsband Bartholmai, Matthias; Werner, Klaus-Dieter; Kammermeier, Michael; Köppe, Tabea Multichannel measuring of strain and acceleration during high impact drop tests with a single cable system 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 obtained in laboratory investigations and full-scale drop tests. VDE Verlag GmbH Informationstechnische Gesellschaft im VDE (ITG); VDI/VDE-Gesellschaft Mess- und Automatisierungstechnik (GMA) 2014 Sensoren und Messsysteme 2014 - 17. ITG/GMA-Fachtagung 250 978-3-8007-3622-5 Sensoren und Messsysteme 2014 - 17. ITG/GMA-Fachtagung Nürnberg, Germany 03.06.2014 04.06.2014 Article 66, 1 5 2016-02-20 OPUS4-31526 Beitrag zu einem Tagungsband Neumann, Patrick P.; Bennetts, V.H.; Lilienthal, A.J.; Bartholmai, Matthias From insects to micro air vehicles - a comparison of reactive plume tracking strategies Insect behavior is a common source of inspiration for roboticists and computer scientists when designing gas-sensitive mobile robots. More specifically, tracking airborne odor plumes, and localization of distant gas sources are abilities that suit practical applications such as leak localization and emission monitoring. Gas sensing with mobile robots has been mostly addressed with ground-based platforms and under simplified conditions and thus, there exist a significant gap between the outstanding insect abilities and state-of-the-art robotics systems. As a step toward practical applications, we evaluated the performance of three biologically inspired plume tracking algorithms. The evaluation is carried out not only with computer simulations, but also with real-world experiments in which, a quadrocopter-based micro Unmanned Aerial Vehicle autonomously follows a methane trail toward the emitting source. Compared to ground robots, micro UAVs bring several advantages such as their superior steering capabilities and fewer mobility restrictions in complex terrains. The experimental evaluation shows that, under certain environmental conditions, insect like behavior in gas-sensitive UAVs is feasible in real-world environments. Berlin, Germany Springer Verlag University of Padova 2016 Intelligent autonomous systems 13 - Proceedings of the 13th international conference IAS-13 978-3-319-08338-4; 978-3-319-08337-7 IAS13 - 13th International conference on intelligent autonomous systems Padova, Italy 2014-07-15 2014-07-19 1533 1548 10.1007/978-3-319-08338-4_110 2016-02-20 OPUS4-31527 Beitrag zu einem Tagungsband Neumann, Patrick P.; Kohlhoff, Harald; Werner, Klaus-Dieter; Erdmann, Jessica; Eggeringhaus, Bärbel; Kammermeier, Michael; Schukar, Marcus; Basedau, Frank; Bartholmai, Matthias; Lazik, D.; Ebert, Sebastian Setup of a large scale soil test field with CO2 injection for testing a novel distributed subsurface monitoring system for gas storage areas One of the main unsolved issues of under-ground storages for, e.g., CO2, H2, and natural gas is the comprehensive surveillance of these areas with reasonable effort and costs. Conventional sensors (e.g., soil air probes or borehole probes), however, can only be used for punctual or locally limited measurements; further their application can cause structural influences (invasive application). In this paper, we describe in detail the setup of a CO2 injection soil test field. This test field will be used to enhance and validate an innovative ap-proach for distributed subsurface monitoring of gas storage areas. To the author's knowledge, this is the first time that, for this purpose, a test field is built in an application relevant scale. Verein Deutscher Ingenieure (VDI) 2014 31st Danubia-Adria Symposium on advances in experimental mechanics (Proceedings) 978-3-00-046740-0 31st Danubia-Adria Symposium on advances in experimental mechanics Kempten, Germany 24.09.2014 27.09.2014 238 239 2016-02-20 OPUS4-31731 Beitrag zu einem Tagungsband Bartholmai, Matthias; Werner, Klaus-Dieter; Kammermeier, Michael Hopkinson bar method for temperature dependent testing and calibration of accelerometers The measurement characteristics of every conventional accelerometer are temperature dependent - often to an extent which is highly relevant for the addressed application. For instance, at BAM Container drop tests are performed to investigate and evaluate the structural integrity of Containers for transport and storage of dangerous goods. Often, the test program includes drop tests at specific temperatures, also as part of approval procedures. The applied sensors are exposed to these test conditions and get influenced by them. Acceleration sensors show a considerable temperature influence on their fünction and characteristics. Particularly the damping mechanism of the seismic mass is a critical part. In regard to such applications, capable equipment and methods are required to consider and investigate this aspect in an adequate way. A fortiori as Manufacturer's infonnation often is deficient. This study presents the setup and results of a method for testing and calibration of acceleration sensors under high dynamic irnpact. It combines a Hopkinson Bar with a temperature chamber. Verein Deutscher Ingenieure (VDI) 2014 31st Danubia-Adria Symposium on advances in experimental mechanics (Proceedings) 978-3-00-046740-0 31st Danubia-Adria Symposium on advances in experimental mechanics Kempten, Germany 24.09.2014 27.09.2014 244 245 2016-02-20 OPUS4-22051 Beitrag zu einem Tagungsband Neumann, Patrick P.; Wiggerich, B.; Bartholmai, Matthias Micro-drone for the characterization and self-optimizing search of hazardous gaseous substance sources German Institute of Navigation (DGON) 2010 IMAV 2010 - International micro air vehicle conference and flight competition (Proceedings) IMAV 2010 - International micro air vehicle conference and flight competition Braunschweig, Germany 2010-07-06 2010-07-09 1 5 2016-02-19 OPUS4-38244 Beitrag zu einem Tagungsband Neumann, Patrick P.; Lazik, D.; Bartholmai, Matthias Leak detection with linear soil gas sensors under field conditions - First experiences running a new measurement technique A 400 m² soil test field with gas injection system was built up, which enables an experimental validation of linear gas sensors for specific applications and gases in an application-relevant scale. Several injection and soil watering experiments with carbon dioxide (CO2) at different days with varying boundary conditions were performed indicating the potential of the method for, e.g., rapid leakage detection with respect to Carbon Capture and Storage (CCS) issues. IEEE 2016 Proceedings of the IEEE Sensors 2016 978-1-4799-8287-5 IEEE Sensors 2016 Orlando, FL, USA 30.10.2016 03.11.2016 B-3-65, 757 759 2016-11-15 OPUS4-37670 Beitrag zu einem Tagungsband Schukar, Vivien; Köppe, Enrico; Hofmann, Detlef; Westphal, Anja; Sahre, Mario; Gong, Xin; Bartholmai, Matthias; Beck, Uwe Magnetic field detection with an advanced FBG-based sensor device A high-performance fiber Bragg grating-based (FBG) sensor device has been developed for the detection of small magnetic fields. Based on a smart multilayer jacket around the fibre over the physical length of the FBG, magnetic fields generated by rotating machine parts, power generators or power cable can be easily detected, analysed and evaluated. Consequently, this innovative, on-line and non-contact inspection method results in an increase in quality and reliability of high-performing machine parts, devices and cables. The basic physical principle is based on a magnetostrictive multilayer system that strains the high-resolution FBG element in presence of magnetic fields. Subsequently, a fixed relationship between induced magnetic field and wavelength change of the FBG element describes the characteristic sensitivity curve. Intensive tests regarding characterisation of this magnetic field FBG sensor have been carried out and its performance has been evaluated. Elsevier Ltd. 2016 30th Eurosensors Conference - EUROSENSORS 2016 168 30th Eurosensors Conference, EUROSENSORS 2016 Budapest, Hungary 04.09.2016 07.09.2016 1270 1274 urn:nbn:de:kobv:b43-376703 10.1016/j.proeng.2016.11.445 http://creativecommons.org/licenses/by-nc-nd/3.0/de/deed.de 2017-01-05 OPUS4-37644 Beitrag zu einem Tagungsband Neumann, Patrick P.; Lazik, D.; Bartholmai, Matthias Aulova, Alexandra; Rogelj Ritonja, A.; Emri, I. Validation of membrane-based linear soil gas sensors - results from repetitive CO2 injection experiments performed in the field This work presents first results from repetitive CO2 injection experiments performed on a recently built-up 400 m² soil test field with gas injection system. The test field contains 48 membrane-based linear gas sensors that were installed in several depths of the test field. Sensors for measuring meteorological parameters (e.g., wind / rain) and the parameters soil temperature, soil moisture, and groundwater level were installed additionally. Ljubljana Narodna in univerzitetna knjižnica, Ljubljana 2016 33rd Danubia- Adria Symposium on Advances in Experimental Mechanics - BOOK OF ABSTRACTS 978-961-94081-0-0 33rd Danubia- Adria Symposium on Advances in Experimental Mechanics Portorož, Slovenia 20.09.2016 23.09.2016 174 175 2016-10-05 OPUS4-37645 Beitrag zu einem Tagungsband Schukar, Vivien; Köppe, Enrico; Hofmann, Detlef; Westphal, Anja; Sahre, Mario; Beck, Uwe; Gong, Xing; Bartholmai, Matthias Aulova, Alexandra; Rogelj Ritonja, A.; Emri, I. A contribution to intelligent automatic validation of structure-integrated fibre optic strain sensors Sensors integrated into devices and structures provide essential data to control, optimize or manage machines and structural components. In the last years, processes, applications and machine parts became more and more intelligent. Consequently, the need for sensor validation increased significantly in order to rely on sensor data and measurement results. Structure-integrated fibre optic strain sensors, such as fiber Bragg gratings (FBG), are of special interest in the composite manufacturing industry. This type of sensor makes it possible to gain information and to collect measurement data about entire production processes and whole life-time cycles of composite-made machine parts and structures. However, validation concepts and approaches for this type of sensors are barely reported in literature. Furthermore, all the reported activities have the drawback that the sensor diagnosis strategy is implemented as limited mathematical models and/or complex time-consuming spectral analysis tools which are applied in data post-processing loops. However, to automate sensor validation and to apply real-time and in-field sensor fault detection, it is necessary to acquire measurement data and information about the measurement reliability at the same time. Ljubljana Narodna in univerzitetna knjižnica, Ljubljana 2016 33rd Danubia- Adria Symposium on Advances in Experimental Mechanics - BOOK OF ABSTRACTS 978-961-94081-0-0 33rd Danubia- Adria Symposium on Advances in Experimental Mechanics Portorož, Slovenia 20.09.2016 23.09.2016 180 181 2016-10-05 OPUS4-37646 Beitrag zu einem Tagungsband Bartholmai, Matthias; Werner, Klaus-Dieter; Kohlhoff, Harald; Helmerich, Rosemarie; Daum, Werner Aulova, Alexandra; Rogelj Ritonja, A.; Emri, I. Long-Term measurement of vertical displacements at the outer concrete bridges of the Berlin Main Station Berlin Main Station is the largest multi-level station in Europe. Its daily passenger number amounts to over 300.000. Structures built for such a large number of people require a high-level safety standard. The station was built on the inner city site of the historic Lehrter Bahnhof. The conditions for building and start of operation were challenging by several reasons. The typical sandy ground with a high level of groundwater makes the permanent static stability of such a complex structure difficult. Several completed, ongoing, and planned construction activities in the immediate vicinity of the station influence the ground settlement of the whole area. On basis of the structural design an impact prediction was calculated, which expected certain vertical displacements particularly between the single columns of the outer concrete bridges of the building. These columns support the glass roof construction, which only allows a defined limit of displacement. In order to avoid damage, a concept for monitoring and adjusting potentially occurring displacements was developed for installation at the outer bridges of the station. Ljubljana Narodna in univerzitetna knjižnica, Ljubljana 2016 33rd Danubia- Adria Symposium on Advances in Experimental Mechanics - BOOK OF ABSTRACTS 978-961-94081-0-0 33rd Danubia- Adria Symposium on Advances in Experimental Mechanics Portorož, Slovenia 20.09.2016 23.09.2016 166 167 2016-10-05 OPUS4-38402 Beitrag zu einem Tagungsband Wander, Lukas; Paul, Andrea; Rurack, Knut; Biyikal, Mustafa; Juritsch, Elevtheria; Bernstein, Thomas; Bartholmai, Matthias; Noske, Reinhard Kompaktsensor zur Online-Überwachung von Nitroaromaten Nitroaromaten und insbesondere Trinitrotoluol (TNT) sind weit verbreitete Spreng- und Umweltschadstoffe. Die größte Herausforderung bei der Detektion von TNT in der Gasphase ist der geringe Dampfdruck. Derzeit werden vielerorts günstige, schnelle, handliche und einfach zu bedienende Alternativen zur klassischen TNT-Analytik entwickelt. Aktuell existieren keine einheitlichen Richtlinien für Sprengstoffsensoren. Hier wird die Entwicklung eines Messplatzes zur Validierung von Sprengstoffsensoren sowie die Erprobung eines kompakten Mustersensors vorgestellt. 2016 Tagungsband – 12. Kolloquium Prozessanalytik 12. Kolloquium Prozessanalytik Berlin, Germany 28.11.2016 30.12.2016 P11, 61 62 2016-11-22 OPUS4-38388 Beitrag zu einem Tagungsband Bartholmai, Matthias; Johann, Sergej; Kammermeier, Michael; Müller, Maximilian; Strangfeld, Christoph Transmission characteristics of RFID sensor systems embedded in concrete Completely embedded sensor systems for long-term operation offer innovative possibilities for structural health monitoring of concrete structures. Measuring of relevant parameters, e.g., temperature, humidity, or indication of corrosion can be performed with low energy sensors. This allows to implement passive RFID sensor systems without cable connection and battery, which are power supplied exclusively by the electromagnetic field from the external reader device. To evaluate characteristics and conditions of this concept, a systematical investigation of the transmission characteristics with variation of relevant parameters, as communication frequency, installation depth, type of concrete, moisture content, etc. is currently carried out in an interdisciplinary research project at BAM. First results are presented in this paper. IEEE 2016 Proceedings of the IEEE Sensors 2016 978-1-4799-8287-5 IEEE Sensors 2016 Orlando, FL, USA 30.10.2016 03.11.2016 1541 1543 2016-11-22 OPUS4-34489 Beitrag zu einem Tagungsband Petrov, Sergej; Neumann, Patrick P.; Werner, Klaus-Dieter; Lazik, D.; Bartholmai, Matthias Concept for investigating mechanical impacts on distributed subsurface gas monitoring A multifunctional sensor in line shape was developed and introduced in previous work for measuring of gas concentrations, temperature change, and strain. A current field study focuses on a spatially distributed monitoring of subsurface CO2 gas storage sites in near real time. Mechanical impacts, e.g., caused by construction work, denudation, and seismic activity, can affect the integrity of underground gas storage sites. Thermal or moisture impacts, e.g., caused by weather conditions, can influence the gas distribution behavior. In this paper, we briefly describe the setup of a CO2 injection soil test field. This setup contains actuating elements for the investigation of mechanical and thermal impacts on distributed subsurface gas monitoring. A concept is given for evaluating these impacts and first experimental results are presented. Zilina Elsevier Science 2015 32nd Danubia-Adria Symposium on advances in experimental mechanics (Proceedings) 3 32nd Danubia-Adria Symposium on advances in experimental mechanics Starý Smokovec, Slovakia 22.09.2015 25.09.2015 4 1124 1128 10.1016/j.matpr.2016.03.060 2016-02-20 OPUS4-34491 Beitrag zu einem Tagungsband Neumann, Patrick P.; Ebert, Sebastian; Lazik, D.; Bartholmai, Matthias Inverse calibration routine for linear soil gas sensors Gas sensors in linear form based on the measuring principle of gas selective permeability through a membrane were developed and introduced for the detection and quantification of gas concentrations. A current field study focuses on measuring CO2 concentrations for a spatially distributed monitoring of subsurface CO2 gas storage sites in near real time. A 400 m(2) test site and a corresponding laboratory system were built up to characterize, validate, and optimize the sensor. A calibration routine was developed, which can be applied subsequently to underground installation. First measurement results indicate the potential of the method. Zilina Faculty of Mechanical Engineering, Univerzity of Zilina, Slovakia 2015 32nd Danubia-Adria Symposium on advances in experimental mechanics (Proceedings) 978-80-554-1094-4 32nd Danubia-Adria Symposium on advances in experimental mechanics Starý Smokovec, Slovakia 22.09.2015 25.09.2015 68 69 10.1016/j.matpr.2016.03.051 2016-02-20 OPUS4-34849 Beitrag zu einem Tagungsband Neumann, Patrick P.; Bartholmai, Matthias; Lazik, D. Near real-time reconstruction of 2D soil gas distribution from a regular network of linear gas sensors A monitoring method is introduced that creates, in near real-time, two-dimensional (2D) maps of the soil gas distribution. The method combines linear gas sensing technology for in-situ monitoring of gases in soil with the mapping capabilities of Computed Tomography (CT) to reconstruct spatial and temporal resolved gas distribution maps. A weighted iterative algebraic reconstruction method based on Maximum Likelihood with Expectation Maximization (MLEM) in combination with a source-by-source reconstruction approach is introduced that works with a sparse setup of orthogonally-aligned linear gas sensors. The reconstruction method successfully reduces artifact production, especially when multiple gas sources are present, allowing the discrimination between true and non-existing so-called ghost source locations. A first experimental test indicates the high potential of the proposed method for, e.g., rapid gas leak localization. IEEE 2015 Proceedings of the IEEE Sensors 2015 978-1-4799-8202-8 IEEE Sensors 2015 Busan, South Korea 01.11.2015 04.11.2015 1550 1553 2016-02-20 OPUS4-33263 Beitrag zu einem Tagungsband Bartholmai, Matthias; Ebert, Sebastian; Neumann, Patrick P.; Noske, Reinhard; Rehak, W.; Lazik, D. Linear gas sensor for methane based on a selectively permeable membrane In preliminary work, gas sensors in linear form based on the measuring principle of gas selective permeability through a membrane were developed and introduced for the detection and quantification of gas concentrations. In this study, first experimental results are presented for adapting the technology for measuring methane (CH4). A material with suitable selective permeability was identified and utilized in a sensor setup containing the gas selective membrane and a reference membrane, both integrated in a measuring cell, to which a gas stream with defined CH4 concentrations was applied. The results prove the sensor's capability for measuring methane and indicate further application potential of the method, e.g., as a robust field monitoring technology, since CH4 is the major component of natural gas, town gas, and fracking gas. AMA Service GmbH 2015 AMA Conferences 2015 with SENSOR and IRS2 (Proceedings) 978-3-9813484-8-4 AMA Conferences 2015 with SENSOR and IRS2 Nuremberg, Germany 19.05.2015 21.05.2015 833 835 10.5162/sensor2015/P8.1 2016-02-20 OPUS4-38634 Beitrag zu einem Tagungsband Schukar, Vivien; Gong, Xin; Hofmann, Detlef; Basedau, Frank; Köppe, Enrico; Bartholmai, Matthias; Westphal, Anja; Sahre, Mario; Beck, Uwe Berghmans, F.; Mignani, A. G. Modelling and simulation of a fibre Bragg grating strain sensor based on a magnetostrictive actuator principle A new concept for the self-diagnosis of embedded fiber Bragg grating (FBG) strain sensors was developed, simulated and experimentally tested. This concept is based on a magnetostrictive metallic layer directly coated on the fibre cladding over the grating segment of the FBG sensor, so that an on-demand external magnetic field in a millitesla scale can produce a controllable artificial strain as an indication signal for the remote optical interrogator. The relationship between the pre-defined magnetic field and its induced Bragg wavelength shift characterizes this validation concept. Any deviation of the local bonding state of the interfaces from the initial or/and any change of shear strain transferring mechanism from composite matrix to the optical fibre core will result in alterations in this sensitive relationship, and thus triggers an immediate alert for a further inspection. The finite element method is used to simulate the strain of this configuration as result of different values of the magnetic field in order to optimize the geometrical sensor parameters. The simulations are verified by experiments results. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only. SPIE Digital Library SPIE - the international society for optics and photonics 2016 Optical Sensing and Detection IV 9899 9781510601444 Optical Sensing and Detection IV Brüssel, Belgium 03.04.2016 07.04.2016 9899-39 10.1117/12.2224728 2016-12-09