Forschung / Research
Just published:
Andreas Schütze, Tilman Sauerwald: Indoor air quality monitoring
in: Eduard Llobet (ed.): Advanced Nanomaterials for Inexpensive Gas Microsensors - Synthesis, Integration and Applications
Elsevier Series Micro and Nano Technologies, 2019
doi: 10.1016/B978-0-12-814827-3.00011-6
Abstract
Indoor air quality is a major public health concern with an estimated half million premature deaths caused annually in Europe alone. Conventional methods of indoor air quality measurements using analytical standards have multiple shortcomings. First, they do not allow continuous monitoring due to their high costs. Second, they predominantly measure nonpolar volatile organic compounds and are often neglecting permanent gases, very volatile, low volatile, and polar compounds. Low-cost sensors and sensor systems based on nanomaterials are an obvious supplement to the existing methods, which can measure continuously and cover a broad range of substances. Metal oxide semiconductor gas sensors can meet the requirements in sensitivity, selectivity, and stability, especially when used with dynamic operation, for example, temperature-cycled operation. The required sensitive sensors with short thermal time constants can be obtained by novel deposition methods for thin granular oxide films using pulsed laser deposition or flame spray pyrolysis. The quality of the measurement, especially concerning selectivity between VOC and permanent gases, can be improved further by integrated sensor preconcentrator systems, which have been demonstrated as low-cost system without mechanical actuators. The high relevance of IAQ measurements has been the driving force for the development of a new generation of digital gas sensors from various manufacturers, which have been released within the last few years.
Just published ahead of print:
Andreas Schütze, Tilman Sauerwald: Dynamic operation of semiconductor sensors
in: Raivo Jaaniso and Ooi Kiang Tan (eds.): Semiconductor Gas Sensors
Woodhead Publishing Series in Electronic and Optical Materials, 2nd Edition, 2020
doi: 10.1016/B978-0-08-102559-8.00012-4
Abstract
Semiconductor gas sensors not only offer high sensitivity and robust long-term performance but also suffer from poor selectivity. A powerful approach to improve selectivity is based on dynamic operation. The most relevant and widely studied method is temperature modulation which can be applied to metal oxide semiconductor (MOS) gas sensors, pellistor-type sensors, and gas-sensitive field-effect transistors (GasFETs). Other dynamic operating modes are based on field effect/polarization and on optical excitation. All methods change the equilibrium on the sensor surface and thus provide additional information especially during nonequilibrium states. The generic term dynamic operation implies the active variation of a control parameter by the sensor electronics allowing application-specific optimization of the sensor system performance. This chapter discusses dynamic operating modes for MOS and GasFET sensors to show that not only selectivity can be improved but that stability and even sensitivity benefit from this approach.
Our EMPIR research project Metrology for the Factory of the Future - Met4FoF is highlighted by Euramet, the European Association of National Metrology Institutes, in its neews feed.
Research develops methods for machine learning in metrology for sensor networks
The article especially stresses the three open access data sets provided by the project, two from our research in the field of industrial condition monitoring (projects iCM-Hydraulics and MoSeS-Pro). These data sets, which are seldom provided from such sensor networks for research purposes, will be of interest to machine learning researchers and other data scientists.
The International Conference on Shape Memory and Superelastic Technologies (SMST), the leading worldwide conference and exposition for the shape memory and superelastic technologies, will be held from May 13 - 17, 2019 at The Bodenseeforum in Konstanz, Germany.
The Lab for Measurement Technology in cooperation with the intelligent Materials Systems Lab (iMSL) of Saarland University will present three contributions to the conference:
- Nicolas Michaelis, Felix Welsch, Susanne-Marie Kirsch, Stefan Seelecke, Andreas Schütze: Experimental Determination of elastocaloric Latent Heat
- Susanne-Marie Kirsch, Felix Welsch, Nicolas Michaelis, Paul Motzki, Andreas Schütze, Stefan Seelecke: Continuous operating elastocaloric cooling device: First experimental results
Session: Theory and Experimental Validation II
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Felix Welsch, Susanne-Marie Kirsch, Nicolas Michaelis, Paul Motzki, Andreas Schütze, Stefan Seelecke: Continuous operating elastocaloric cooling device: First modeling results
Vom 2. - 4. Dezember 2019 findet in Dresden das
statt, ausgerichtet durch die Fachgruppe Mess- und Sensortechnik von Dechema und AMA.
Call for Paper (Deadline 04.09.2019)
Aktuelles zu Messtechnik & Sensorik: Smart Sensors, spezielle Einsatzumgebungen, Anwendungen in Umwelt, Medizin, Mobilität, Industrie uvm
Wie sehr Messungen unser tägliches Leben beeinflussen, zeigen die aktuellen Diskussionen zu Luftschadstoffen und daraus resultierenden Fahrverboten. Ähnlich relevant sind Sensorik und Messtechnik in den Bereichen autonomes Fahren, Medizin und Lebensmittel, aber auch im industriellen Umfeld sowie beim Smart Farming. Seien Sie beim 14. Dresdner Sensor-Symposium dabei, vernetzen Sie sich mit exzellenten Wissenschaftlern und Entscheidern aus der Industrie. Sie erhalten aus erster Hand neueste Ergebnisse aus Forschung und Entwicklung in Hochschulen und Industrie!
Mehr als 20 wissenschaftliche Vorträge und über 50 Poster erwarten die Teilnehmer. Acht Übersichtsvorträge renommierter Fachleute, u.a. von Agricon GmbH, Bayer/BASF, IBM, der PTB und den Universitäten Wien und Hannover, prägen das hochkarätige Programm u.a. mit Beiträgen zur medizinischen Relevanz von Luftqualität, zur Digitalisierung in der chemischen Industrie und zur metrologischen Verlässlichkeit von Algorithmen im Bereich Industrie 4.0.