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Erscheinungsjahr
- 2018 (22) (entfernen)
Dokumenttyp
- Posterpräsentation (10)
- Beitrag zu einem Tagungsband (7)
- Vortrag (3)
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- Forschungsbericht (1)
Schlagworte
- Environmental monitoring (4)
- Mobile Robot Olfaction (4)
- Drop test (3)
- Tomographic reconstruction of gas plumes (3)
- UAV-REGAS (3)
- Gas sensing (2)
- High impact shock application (2)
- Hopkinson bar (2)
- Localization of gas sources (2)
- Magnetostriktive Beschichtung (2)
- Mobile robot olfaction (2)
- Nano aerial robot (2)
- Piezoresistive accelerometer (2)
- Swarm (2)
- Temperature characteristics (2)
- Tunable Diode Laser Absorption Spectroscopy (TDLAS) (2)
- Accelerometer (1)
- Aerial robot (1)
- Ammonia (1)
- Analysis (1)
- Bauteilmonitoring (1)
- Bauwerksüberwachung (1)
- Concrete (1)
- Drop (1)
- Eindringmodul (1)
- Embedded system (1)
- Estimation (1)
- Faser-Bragg Gitter (1)
- Faser-Bragg-Gitter (FBG) (1)
- Fluorescence sensor (1)
- Fluorescent sensor (1)
- Flying platforms (1)
- Frequency response (1)
- Gas sensors (1)
- Gas standard generator (1)
- Hopkinson Bar (1)
- Härtevergleichsplatten (1)
- Instrumentierte Eindringprüfung (1)
- Kraftabhängige Funktion (1)
- Magneto-optischer Sensor (1)
- Maschinennachgiebigkeit (1)
- Measurement (1)
- Multigassensoren (1)
- Multirotor aircraft (1)
- Oil (1)
- Passive sensor interface (1)
- Permeation (1)
- Prototyp (1)
- Prüfung (1)
- RFID (1)
- Remote gas sensing (1)
- Richtlinie (1)
- Selbstkalibrierung (1)
- Sensorvalidierung (1)
- Sphärische Indenter (1)
- Structural Health Monitoring (1)
- Structural Health Monitoring (SHM) (1)
- Temperature behavior (1)
- Test (1)
- Test gas generation (1)
- Tunable diode laser absorption Spectroscopy (TDLAS) (1)
- UAS (1)
- UAV (1)
- Umweltmonitoring (1)
- Vereinfachtes Verfahren (1)
- Water quality (1)
- Wind vector (1)
- Wireless mobile sensor device (1)
Organisationseinheit der BAM
- 8.1 Sensorik, mess- und prüftechnische Verfahren (22) (entfernen)
Eingeladener Vortrag
- nein (3)
BAM is the German Federal Institute for Materials Research and Testing and the competent authority for mechanical and thermal safety assessment of transport packages for spent fuel and high level waste. In context with safety assessment of RAM packages BAM performed numerous drop tests in the last decades. The tests were mostly accompanied by extensive and various measurement techniques especially by instrumented measurements with strain gages and accelerometers.
The procedure of drop testing and the resulting measurement analysis are the main methods to evaluate the safety against mechanical test conditions. Measurement techniques are dedicated to answer questions in regard to the structural integrity of a RAM package, the mechanical behavior of the prototype as well as of its content under impact conditions.
Test results like deceleration-time functions constitute a main basis for the validation of assumptions in the safety analysis and for the evaluation of numerical calculations. In this context the adequate selection of accelerometers and measurement systems for the performance of drop tests is important. Therefore it is not only necessary to find suitable positions for the accelerometers at the test specimens, but also to consider technical boundary conditions as e.g. temperature.
Im Projekt KonSens werden für die Anwendungsbei-
spiele bauteilintegrierte Sensorik für Betonkomponen-
ten und mobile Multigassensorik Sensorsysteme in
Form von Funktionsmustern entwickelt, validiert und
angewendet. Schwerpunkte liegen einerseits in der
Detektion und Bewertung von Korrosionsprozessen in
Beton und andererseits in der Detektion und Quantifi-
zierung sehr geringer Konzentrationen toxischer Gase
in der Luft. Dabei ist die Adaption der sensorischen
Methoden aus dem Labor in reale Messumgebungen
inklusive geeigneter Kommunikationstechnik ein
wichtiger Aspekt.
Structural Health Monitoring (SHM) has become very important in today's rapidly developing time. High buildings, large bridges and complex technical structures need to be monitored continuously and this over long periods.
Visual monitoring cannot evaluate the internal condition of building structures. Thus, material embedded sensors are needed. Cable connection of these sensors pose the disadvantage of weak spots and water intrusion. For concrete embedded sensors the use of batteries is not convenient, because of limited lifetime, difficult charging, and generation of electrical waste.. Hence, monitoring should be implemented preferentially with firmly embedded passive RFID sensor modules. However, since the concrete structure forms an electromagnetically reflective and absorbing barrier, only limited energy can be transmitted to the module. This project requires a highly energy-saving system, which can record different sensor parameters at critical points.
Sensor network deployment
(2018)
Temperature characteristics of a piezoresistive accelerometer for high impact shock application
(2018)
This study presents the characterization of a piezoresistive accelerometer damped with silicon oil for the application in drop tests carried out at BAM. Experiments were performed with the Hopkinson Bar method in close correlation to the real-world application conditions. The results point out certain limitations regarding the temperature influence and the frequency response. Additional experiments were performed with a gas damped type of piezoresistive accelerometer, which has superior specifications, particularly for low temperatures. The results allow for a comparison.
Temperature characteristics of a piezoresistive accelerometer for high impact shock application
(2018)
This study presents the characterization of a piezoresistive accelerometer damped with silicon oil for the application in drop tests carried out at BAM. Experiments were performed with the Hopkinson Bar method in close correlation to the real-world application conditions. The results point out certain limitations regarding the temperature influence and the frequency response. Additional experiments were performed with a gas damped type of piezoresistive accelerometer, which has superior specifications, particularly for low temperatures. The results allow for a comparison.
Leaking methane from infrastructures, such as pipelines and landfills, is critical for the environment but can also pose a safety risk. To enable a fast detection and localization of these kind of leaks, BAM developed a novel robotic platform for aerial remote gas sensing. Spectroscopic measurement methods for remote sensing of selected gases lend themselves for use on mini-copters, which offer a number of advantages for inspection and surveillance over traditional methods. No direct contact with the target gas is needed and thus the influence of the copter downwash on the measured gas plume can be kept to a minimum. This allows to overcome one of the major issues with gas-sensitive mini-copters. On the other hand, remote gas sensors, most prominently Tunable Diode Laser Absorption Spectroscopy (TDLAS) sensors have been too bulky given the payload and energy restrictions of mini-copters. Here, we present the Unmanned Aerial Vehicle for Remote Gas Sensing (UAV-REGAS), which combines a novel lightweight TDLAS sensor with a 3-axis aerial stabilization gimbal for aiming on a versatile multicopter. The proposed system can be deployed in scenarios that cannot be addressed by currently available systems and thus constitutes a significant step forward for the field of Mobile Robot Olfaction (MRO). It enables tomographic reconstruction of gas plumes and a localization of gas sources. We also present first results showing its performance under realistic conditions.
Emissions of ammonia into the environment are mainly caused by agriculture, but also by combustion processes in waste and by road traffic. Even at low concentrations, this substance is not only an odour nuisance, but also a substance with ecological and climatic relevance. Therefore, BAM tested commercial electrochemical, and metal oxide based sensors, which have limited suitability for measuring in the environmental molar fraction range. Alternatively, own developments for the detection of ammonia in the trace range were implemented, wherein the analyte is measured by changing the fluorescence of a BODIPY dye at 550 nm by means of a portable fluorescence sensor directly from the gas phase. For the calibration of ammonia sensors and measuring instruments, a stationary system based on the mixture of certified test gases from pressure cylinders with calibrated mass flow controllers is available. A test gas generator was developed for on-site calibration and testing of sensors and measuring devices. The generation of ammonia-containing gases in the environmental relevant range of levels below 1000 nmol/mol is carried out by the permeation method according to ISO 6145-10. For the traceability of ammonia, standards are provided and further developed by the National Metrological Institutes and designated institutes. Metrological standards are based on SI units and are a basis for traceability of sensors or gas analysers.
Der Beitrag präsentiert die erarbeiteten technischen Richtlinien zur Anwendung und Prüfung von Multigassensoren innerhalb der Richtlinienreihe VDI/VDE 3518 sowie in diesem Zusammenhang die Möglichkeiten der Sensorprüfung im akkreditierten Prüflabor des Fachbereichs 8.1 der BAM. Im Speziellen wird das in Kürze veröffentlichte Blatt 3 der Richtlinienreihe vorgestellt, das Bezug auf Multigassensoren für geruchsbezogene Messungen mit elektronischen Nasen nimmt.
Small unmanned aircraft (UA) are used increasingly as flying sensor platforms. Amongst other things they are used for environmental monitoring, for example gas distribution mapping. Sometimes, these applications require knowledge of the ambient wind field, which can be measured by additional devices like anemometers. In general, it would be interesting to avoid such additional apparatuses. One way to achieve this is to estimate the wind vector, that is both the wind direction and speed, from the state variables of the UA.