TY - CONF A1 - Gawlitza, Kornelia A1 - Tiebe, Carlo A1 - Banach, Ulrich A1 - Noske, Reinhard A1 - Bartholmai, Matthias A1 - Rurack, Knut T1 - Novel sensor for long-term monitoring of ammonia in gas phase N2 - Because ammonia and its reaction products can cause considerable damage to human health and ecosystems, there is a need for reliably operating and reversibly interacting sensor materials to monitor traces of gaseous ammonia in ambient air, which at best can be used on-site for in-the-field measurements. Herein, the development of a sensor material for gaseous ammonia in the lower ppm to ppb range using optical fluorescence as transduction mechanism is presented. A fluorescent dye, which shows reversible fluorescence enhancement in the presence of ammonia is incorporated into a polymer matrix, the latter to ensure the accumulation of ammonia. The sensor material is integrated into a prototype of a miniaturized sensor device, facilitating long-term operation. To calibrate the optical sensor system a gas standard generator, producing standard gas mixtures, is used, leading to a sensitivity down to lower ppm concentrations of ammonia. T2 - 13. Dresdner Sensor-Symposium 2017 CY - Dresden, Germany DA - 04.12.2017 KW - Ammonia gas sensor KW - Fluorescence KW - Air quality monitoring KW - Standard gas generator KW - Miniaturized sensor device PY - 2017 DO - https://doi.org/10.5162/13dss2017/P4.02 SP - P4.02, 272 EP - 276 AN - OPUS4-43352 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bartholmai, Matthias A1 - Neumann, Patrick P. A1 - Tiebe, Carlo A1 - Johann, Sergej T1 - Adaptable multi-sensor device for gas detection N2 - Innovation is the catalyst for the technology of the future. It is important to develop new and better technologies that can continuously monitor the environmental impact, e.g., for air Quality control or emission detection. In the recently at BAM developed Universal Pump Sensor Control (UPSC3) module, different components and sensors are fused. The combination of the individual components makes the UPSC3 module an excellent monitoring and reference system for the development and characterization of gas specific sensors. Measurements over long periods are possible, for mixed gas loads or for certain gas measurements. The System is part of a mobile sensor network of several sensor units, which can also be used as standalone systems. T2 - Networked Environmental Monitoring – from sensor principles to novel services CY - BAM, Berlin, Germany DA - 06.02.2018 KW - Environmental monitoring PY - 2018 AN - OPUS4-44077 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Detjens, Marc A1 - Tiebe, Carlo A1 - Banach, Ulrich A1 - Ritter, U. T1 - Ionic Liquid Based Coulometric Trace Humidity Sensors N2 - This work presents a first attempt to use ionic liquids as a new coating for planar coulometric sensors. These sensors are used for the measurement of trace humidity in various gases. Usually, the coating of the sensors is tetraphosphorus decaoxide and its hydrolysis products. Instead, a hygroscopic ionic liquid was used as sensor coating in this work. Generated frost point temperatures tf in the gas ranged from -80 °C to -30 °C, which is equivalent to vapour mole fractions xv from 0.5 μmol·mol-1 to 376 μmol·mol-1. In addition to the coulometric sensors, the generated humidity is determined by a precision dew point hygrometer as reference. First results show that it is possible to measure humidity with ionic liquid based coulometric sensors. T2 - ALLSENSOR 2018 CY - Rom, Italy DA - 25.03.2018 KW - Ionic liquids. KW - Coulometric sensors KW - Sensor coating KW - Trace humidity measurement PY - 2018 SN - 978-1-61208-621-7 SP - 13 EP - 14 PB - IARIA AN - OPUS4-44609 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Nattuveettil, Keerthana A1 - Liebner, Christian A1 - Tiebe, Carlo T1 - Hydrogen safety- Dealing with Closed Spaces N2 - Hydrogen is under discussion as a potentially clean energy source, but its safe usage and handling in enclosed environments remains a critical challenge due to the properties of hydrogen. This work focuses on detecting and monitoring hydrogen concentration in closed spaces to improve safety by developing a sensor network-based leak detection system to prevent of the accumulation of hazardous mixtures. Furthermore, the study details the implementation of a hydrogen sensor network within a container, analysing sensor placement, data collection, and safety improvements. The findings contribute to better risk assessment and enhanced safety protocols in hydrogen storage and usage facilities. T2 - SMSI 2025 CY - Nuremberg, Germany DA - 06.05.2025 KW - Sensor Network KW - Hydrogen safety KW - QI-Digital PY - 2025 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-640630 SN - 978-3-910600-06-5 DO - https://doi.org/10.5162/SMSI2025/C6.2 SP - 167 EP - 168 PB - AMA Verband für Sensorik und Messtechnik e.V. CY - Berlin AN - OPUS4-64063 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Tiebe, Carlo A1 - Detjens, Marc A1 - Banach, Ulrich T1 - Messunsicherheiten von Feuchtesensoren N2 - Inhalt dieses Seminarbeitrags sind Hygrometer und Kenngrößen der Hygrometrie, Anforderungen an ein Prüflabor sowie die Bestimmung der Messunsicherheit bei der Prüfung von Feuchtesensoren wie auch Prüfung auf signifikante Abweichungen. T2 - 308. PTB-Seminar Berechnung der Messunsicherheit – Empfehlungen für die Praxis CY - Berlin, Germany DA - 15.03.2018 KW - Messunsicherheit KW - Feuchtesensor KW - Prüflabor PY - 2018 UR - https://www.ptb.de/cms/fileadmin/internet/fachabteilungen/abteilung_8/8.4_mathematische_modellierung/308._PTB_Seminar/Vortraege/4PraxisII/Messunsicherheiten_von_Feuchtesensoren.pdf AN - OPUS4-44546 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Moufid, M. A1 - Tiebe, Carlo A1 - El Bari, N. A1 - Hamada, D. A. A1 - Bartholmai, Matthias A1 - Bouchikhi, B. T1 - Pollution parameters evaluation of wastewater collected at different treatment stages from wastewater treatment plant based on E-nose and E-tongue systems combined with chemometric techniques N2 - Wastewater contains harmful chemicals and heavy metals that are known to cause various environmental and health problems. Therefore, the water quality control using sensitive, simple, fast, accurate, and portable tools is of great importance. This study aimed to evaluate the pollution parameters of wastewaters collected at different treatment stages from a wastewater treatment plant (WWTP) that treats domestic and industrial wastewaters by using an electronic nose (E-nose) and a voltammetric electronic tongue (E-tongue) combined with chemometric techniques. Water and wastewater pollution parameters determination were performed using inductively coupled plasma optical emission spectrometry for the determination of cations, and anions by using ion chromatography. Chemometric techniques, such as Principal Component Analysis (PCA), Discriminant Function Analysis (DFA), Support Vector Machines (SVMs), and Hierarchical Cluster Analysis (HCA), were used to process the E-nose and E-tongue datasets to describe the similarities between the samples. In addition, Partial Least Squares Regression (PLSR) model was constructed using electronic sensing data to simultaneously predict the concentration values of physicochemical parameters. The obtained correlation coefficient, for training and testing sets, is higher than 0.91 for the prediction of the concentration of all physicochemical parameters, except for iron (Fe) which remains 0.84. These results suggest that simple, portable, and inexpensive tools such as electronic nose and tongue are suitable for wastewater analysis. KW - Wastewater KW - Electronic nose KW - Voltammetric electronic tongue KW - Water quality control KW - Chemometric techniques KW - Gas sensing PY - 2022 DO - https://doi.org/10.1016/j.chemolab.2022.104593 VL - 227 SP - 1 EP - 12 PB - Elsevier B.V. AN - OPUS4-55652 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Tiebe, Carlo T1 - Novel mobile multi-gas sensor for ammonia detection in the environment N2 - Pollution through emission of toxic gases becomes an increasing problem for the environment in agricultural, industrial and urban areas. In future, environmental emissions as well as ambient air must be monitored at even lower concentrations as nowadays. Consequently, demands arouse for measuring concentrations as low as the lower ppm or even ppb range. Current state-of-the-art technologies, as for instance electrochemical sensors, have reached their limits in this regard. The developed ammonia gas standard generator produces standard gas mixtures which comply with the metrological traceability for ammonia gas standards in the desired environmentally relevant measurement range of e. g. 0.5 to 500 nmol/mol. This gas standard preparation method is based on the permeation of ammonia through a membrane at a constant temperature as well as the mixing of this permeated gas with a carrier gas to adjust a gas standard of known concentration. The ammonia gas standard is suitable for the calibration of standard optical methods, e. g cavity ring-down spectroscopy (CRDS) and multi-gas sensors. The detection of gaseous ammonia in the lower ppm or even ppb range is obtained by incorporation of a fluorescent dye, which shows fluorescence enhancement in the presence of the analyte, into a polymer support being responsible for the accumulation of the analyte. The use of optical fluorescence as transduction mechanism enables high sensitivity as well as high temporal resolution. Here, we present first results on such a sensor system including the use of the developed gas standard generator for calibration issues. Additional benefits, particularly of fluorescence-based sensors, are their capability for miniaturization and potential multiplex mode. Beside the development of a highly sensitive and selective sensor, the integration of such systems into mobile sensor devices is addressed. These sensors and sensor systems are developed and will be validated and operated in form of functional models for the application areas, structure-integrated sensors and mobile multi-gas sensors. T2 - 2nd MetNH3 workshop on ammonia measurement methodology CY - Bern, Switzerland DA - 09.05.2017 KW - Ammonia KW - Permeation KW - Gas standard preparation KW - Fluorescence-based sensors PY - 2017 AN - OPUS4-40206 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Tahri, K. A1 - Tiebe, Carlo A1 - El Bari, N. A1 - Hübert, Thomas A1 - Bouchikhi, B. T1 - Geographical classification and adulteration detection of cumin by using electronic sensing coupled to multivariate analysis N2 - The objective of this work is to report the improvement obtained in the discrimination of complex aroma and taste with subtle differences in odor and flavor, by the use of fast suitable procedures for the cases of measurements in the field demanding decision-making in real time. The proposed electronic sensing systems, formed by an E-nose and VE-tongue, were used to discriminate cumin cultivars from different geographical origins, as well as to quantify the cumin adulteration percentages by using unsupervised and supervised chemometric tools. Thus, the results obtained are sufficiently encouraging as a starting point for the development of new electronic sensing systems with more improvement such the reliability of the sensors’ performance as well as the chemometric tools in order to deal with a complex dataset. KW - VE-tongue KW - E-nose KW - Chemometric tools KW - Cumin discrimination KW - Geographical origins KW - Adulteration detection PY - 2017 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-409735 DO - https://doi.org/10.1016/j.protcy.2017.04.102 SN - 2212-0173 VL - 27 SP - 240 EP - 241 PB - Elsevier B.V. AN - OPUS4-40973 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schütze, A. A1 - Tiebe, Carlo T1 - Gas sensor characterization and calibration N2 - This seminar contribution contains the topics: 3S - sensitivity, selectivity and stability; sensor drift, aging and poisoning; influence of ambient conditions; gas mixing systems for sensor characterization and on-site field (re)calibration. T2 - Networked Environmental Monitoring – from sensor principles to novel services CY - BAM, Berlin, Germany DA - 06.02.2018 KW - Gas sensor KW - Gas mixing systems KW - Sensor characterization PY - 2018 AN - OPUS4-44088 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Banach, Ulrich A1 - Tiebe, Carlo A1 - Hübert, Thomas ED - Matteo Pardo, ED - Giorgio Sberveglieri, T1 - Application of electronic nose and ion mobility spectrometer to quality control of spice mixtures T2 - 13th International symposium on olfaction and electronic nose CY - Brescia, Italy DA - 2009-04-15 KW - Electronic nose KW - Ion mobility spectrometer KW - Spice mixtures KW - Product adulteration KW - Multivariate data analysis PY - 2009 SN - 978-0-7354-0674-2 N1 - Serientitel: AIP conference proceedings – Series title: AIP conference proceedings VL - 1137 SP - 301 EP - 302 AN - OPUS4-19572 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Tahri, K. A1 - Tiebe, Carlo A1 - Bougrini, M. A1 - Saidi, T. A1 - El Alami-El Hassani, N. A1 - El Bari, N. A1 - Hübert, Thomas A1 - Bouchikhi, B. T1 - Determination of safranal concentration in saffron samples by means of VE-tongue, SPME-GC-MS, UV-vis spectrophotometry and multivariate analysis N2 - An experimental investigation has been carried out to characterize and discriminate seven saffron samples and to verify their declared geographical origin using a voltammetric electronic tongue (VE-tongue). The ability of multivariable analysis methods such as Principal Component Analysis (PCA), Hierarchical Cluster Analysis (HCA) to classify the saffron samples according to their geographical origin have been investigated. A good discrimination has reached using PCA and HCA in the VE-tongue characterization case. Furthermore, cross validation and Partial Least Square (PLS) techniques were applied in order to build suitable management and prediction models for the determination of safranal concentration in saffron samples based on SPME-GC-MS and UV-Vis Spectrophotometry. The obtained results reveals that some relationships were established between the VE-tongue signal, SPMEGC-MS and UV-Vis spectrophotometry methods to predict safranal concentration levels in saffron samples by using the PLS model. In the light of these results, we can say that the proposed electronic system offer a fast, simple and efficient tool to recognize the declared geographical origin of the saffron samples. T2 - IEEE Sensor 2015 CY - Busan, South Korea DA - 01.11.2015 KW - Chemometrics KW - Voltammetric electronic tongue KW - SPME-GC-MS KW - UV-vis Spectrometry KW - Saffron KW - Geographic differentiation PY - 2015 SN - 978-1-4799-8202-8 VL - CFP15SEN-USB SP - 68 EP - 71 PB - IEEE CY - Piscataway AN - OPUS4-36545 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Hübert, Thomas A1 - Majewski, J. A1 - Banach, Ulrich A1 - Detjens, Marc A1 - Tiebe, Carlo T1 - Response Time Measurement of Hydrogen Sensors N2 - The efficiency of gas sensor application for facilitating the safe use of hydrogen depends considerably on the sensor response to a change in hydrogen concentration. Therefore, the response time has been measured for five different-type commercially available hydrogen sensors. Experiments showed that all these sensors surpass the ISO 26142 standard; for the response times t90 values of 2 s to 16 s were estimated. Results can be fitted with an exponential or sigmoidal function. It can be demonstrated that the results on transient behaviour depend on both the operating parameters of sensors and Investigation methods, as well as on the experimental conditions: gas change rate and concentration jump. T2 - 7th International Conference on Hydrogen Safety (ICHS 2017) CY - Hamburg, Germany DA - 11.09.2017 KW - Response time KW - Hydrogen sensor KW - Test facility KW - t90 value PY - 2017 SN - 978-88-902391 SP - 1251 EP - 1261 AN - OPUS4-47592 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Tiebe, Carlo A1 - Hübert, Thomas A1 - Koch, B. A1 - Ritter, U. A1 - Stephan, Ina T1 - Investigation of gaseous metabolites from moulds by ion mobility spectrometry (IMS) and gas chromatography-mass spectrometry (GC-MS) N2 - The metabolism of moulds results in the formation of various microbial volatile organic compounds (MVOCs). These substances can be used as an indicator for the presence of moulds in the indoor environment. Three different mould strains were cultivated on culture media and IMS spectra of gaseous mould metabolites were recorded using a portable mini system with a tritium source and a 5 cm drift cell. The headspace spectra are characteristic for mould species and their age. Typical gaseous components of the metabolites were identified and compared with results obtained from gas chromatography using a mass spectrometer detector. It was observed that the MVOCs formation depends on mould species and their growing stage with a maximum of MVOCs emission occurring during the first 10 days. These preliminary results show that IMS can be applied to detect MVOCs in indoor environment and indicate hidden mould growth. KW - Mould detection KW - MVOC KW - Biochemical sensor system KW - Ion mobility spectrometry KW - IMS KW - Gas chromatography KW - Mass spectrometry KW - Principal component analysis PY - 2010 DO - https://doi.org/10.1007/s12127-009-0035-8 SN - 1435-6163 VL - 13 IS - 1 SP - 17 EP - 24 PB - Springer CY - Berlin; Heidelberg AN - OPUS4-21234 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Tiebe, Carlo T1 - Ionenmobilitätsspektrometrie: Dem Schimmel auf der Spur T2 - Workshop Lebensmittelmonitoring mit Multigassensoren CY - Berlin, Germany DA - 2010-12-07 PY - 2010 AN - OPUS4-22961 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -