2,049 Works

P5.17 - In situ Measurements of O2 and CO in Cement Kilns

O. Driesner, F. Gumprecht & U. Guth
The in situ measurements of O2 and CO simultaneously in cement kilns is a great challenge due to the high temperature of the process and the dust load. A probe is developed for this purpose consisting of a water cooled tube in which are located the solid electrolyte oxygen sensor and a CO mixed potential sensor. In order to prevent the deposition and sintering of raw material the probe rotates 90 ° in certain intervals....

B4.4 - High-resolution speckle sensor for contactless torque measurement in wind energy systems

J. F. Westerkamp, M. Sorg & A. Fischer
In order to extend the operating life of drivetrain components of a wind energy system improved data sets of load cycles could greatly enhance the design process. For this purpose, the effects of transient torque reversals which are dependent on the operating conditions as well as the wind characteristics have to be considered. The sensors currently used in condition monitoring systems, however, are mostly inadequate and often limited in access. The proposed optical speckle sensor...

A6.4 - Novel mixed potential sensor device to compare two gas compartments and to determine directly the conversion of an automotive catalyst

T. Ritter, G. Hagen & R. Moos
In this work, a novel sensor device is developed. It enables to compare two gas compartments electrochemically by applying the mixed potential sensing principle. Thereby, disadvantages that come along with the usually-used half-cell setups like indirect heating, complicated manufacturing and only destructive dismantling of sample and sealing are overcome. The device bases on an yttria-stabilized zirconia disc that is equipped with an integrated heater to provide a hot area in the center for sensing while...

P5.15 - Simulation, Manufacturing and Evaluation of Injection Molded Microbioreactors

F. Schütze, N. Matuschek, S. Zinn, A. Böhme, A. H. Foitzik & L. Santo
Miniaturized flow through devices offer the possibility to mimic the in vivo microenvironment for cultivated cells. In order to guaranty sterility and to eliminate the risk of cross contamination, bioreactors are commonly designed as disposable systems. In order to produce them in large numbers and at low cost, an injection molding process is necessary. Prior to the actual micro injection a simulation software is used to determine the optimal parameter for the injection molding process...

P5.14 - ESPI-Analysis of induced stress on cellular systems

J. Gottschalk, A. Seeliger, C. Stollfuß, K.-H. Lietzau, A. H. Foitzik & M. Richetta
During the last years, various approaches on an individualized drug therapy for benign cells have been researched. However, due to the complex topic a universal approach has not been found until this point. Commonly, the effect of cytotoxic drugs on benign cells is mostly the same as to normal cells and the actual effect of cytotoxic agents on patient cells still can't be predicted. In order to reduce unwanted side effects or unspecific drug reactions...

P5.11 - Cyclic optical activation of semiconducting gas sensors: influence of cycling frequency

T. Wagner, D. Klawinski, D. Meixner & C.-D. Kohl
Resistive semiconducting gas sensors are typically cost-efficient and highly sensitive devices. However, due to the detection mechanism based on oxidizing or reducing surface reactions they lack in inherent selectivity. To compensate this, different methods can be applied, as e.g. utilizing catalytic supplements or temperature cycled operation, each with its specific pros and cons. Here we present a new method based on the utilization of surface reaction kinetics by cyclic optical activation in the UV/Vis range....

P5.9 - Thermopower and conductivity of aerosol deposited gas sensitive BaFe1-xTax03-films

M. Bektas, T. Stöcker, G. Hagen & R. Moos
In this study, the thermopower and the electrical conductivity of BaFe1-xTaxO3- sensor films were measured for x in the range of 0.1 to 0.45 (BFTx). Seebeck coefficient and conductivity were measured simultaneously between 400 and 850 °C under varying oxygen partial pressures from 10-2 to 1 bar. BFTx fine powders were prepared by a conventional mixed-oxide route. Crystal structure and phase purity were investigated by X-ray diffraction. BFTx thick-films were successfully deposited by the novel...

P5.8 - AGaMon - A Mobile Sensor System for Breath Control

R. Seifert, H. B. Keller, T. Conrad & J. Peter
A prototype of a mobile sensor system for breath control of respiratory air is introduced which can be connected via an adapter to a smartphone for on-line monitoring. This system runs an embedded metal oxide gas sensor in a thermo-cyclic mode and determines the alcohol content on the basis of the measurement results via an innovative calibration- and evaluation procedure ProSens3.0 in real time. The analysis results will then be displayed on the smartphone. Especially...

P5.7 - Simulation of a thermoelectric gas sensor to determine hydrocarbons in exhaust gases and to characterize catalyst materials

T. Ritter, S. Wiegärtner, G. Hagen & R. Moos
To determine the hydrocarbon (HC) concentration by an exhaust gas sensor, the thermoelectric sensing principle can be applied. A planar thermopile structure on a ceramic substrate enables measuring a temperature difference between a catalyst-coated and an inert area on the sensor. Exothermic reactions cause a temperature increase in the catalyst-coated area that can be measured as a voltage output of the thermopile. Temperature modulation of the overall sensor temperature allows for catalyst material characterization or...

P5.6 - SnO2 and ZnO Detectors of Hydrogen Peroxide Vapors

V. M. Arakelyan, V. M. Aroutiounian, M. S. Aleksanyan, A. G. Sayunts, G. E. Shahnazaryan, P. Kacer, P. Picha, J. A. Kovarik, J. Pekarek & B. Joost
Thin-film hydrogen peroxide vapors sensors made from SnO2 and ZnO were manufactured by the high-frequency magnetron sputtering method. Thicknesses of deposited doped metal oxide films were measured and its morphology was investigated. Response of the prepared sensors was measured at different concentrations of hydrogen peroxide vapors and temperatures of the sensor work body. It was found that both Co-doped SnO2 and La-doped ZnO sensors exhibit a sufficient sensitivity to 10 ppm of hydrogen peroxide vapors...

P5.5 - MWCNTs/SnO2 Harmful Gas Sensors

V. Aroutiounian, Z. Adamyan, A. Sayunts, E. Khachaturyan, A. Adamyan, P. Fitl & J. Vlcek
We present results of our research works related to the study of thick-film multiwall carbon nanotube/tin oxide nanocomposite sensors of propylene glycol (PG) and dimethylformamide (DMF) vapors derived using hydrothermal synthesis and sol-gel methods. Investigations of response/recovery characteristics in the 50-300oC operating temperature range reveal that the optimal operating temperature for PG and DMF vapor sensors, taking into account both high response and acceptable response and recovery times, are about 200 and 220oC, respectively. A...

P5.4 - Low-cost chemical gas sensors for selective formaldehyde quantification at ppb-level in the field

M. Bastuck, A. Schütze, D. Puglisi, P. Möller, A. Lloyd Spetz, M. Andersson & W. Reimringer
Data from a silicon carbide based field-effect transistor were recorded over a period of nine days in a ventilated school room. For enhanced sensitivity and selectivity especially to formaldehyde, porous iridium on pulsed laser deposited tungsten trioxide was used as sensitive layer, in combination with temperature cycled operation and subsequent multivariate data processing techniques. The sensor signal was compared to reference measurements for formaldehyde concentration, CO2 concentration, temperature, and relative humidity. The results show a...

P5.3 - Detection of Simulants of Chemical Warfare Agents on Textile Chemiresistors

M. Vrnata, A. Sýkorová, E. Maresová, D. Tomecek, S. Havlová, P. Hozák, J. Vlcek, L. Fiser, P. Fitl, M. Aleksanyan, A. Sayunts & V. Aroutiounian
This contribution presents results of development of textile chemiresistors for detection of chemical warfare agents [1-2]. Such sensors are intended as parts of smart textiles. The bearing part of sensor is constituted from a woven non-conductive textile - and equipped with screen-printed graphite electrodes. The gas sensitive layer is composed of the polymeric ionic liquid based on Poly(Tributylhexyl phosphonium 3-sulfopropyl acrylate). Subsequently, responses of textile chemiresistors to 10 ppm of four toxic gases or simulants...

P5.2 - Multilyzer - microfluidic online measuring system for the analysis of environmentally relevant substances

B. Blahnikova, D. Müller, M. Waas & A. Lechner
Excessive use of nitrogen based fertilizers in agriculture represents an environmental hazard. Thus, analysis of soil water and groundwater has become an essential part of substainability and ecological preservation. On this account, the Multilyzer provides a suitable solution. The Multilyzer is a microfluicid online measuring system for the determination of lowest concentrations of nitrate, nitrite and ammonium, all of which are essential components of the nitrogen cycle. The transportable system allows an online measurement and...

P5.1 - Miniaturized Sensor for the Detection of Environmental Pollutants

A. Graf, R. Stübner, C. Kunath, S. Meyer & H. Schenk
A miniaturized ion mobility spectrometer (IMS) for the sensitive and selective detection of low concentrated substances in the ppb-range under atmospheric conditions is presented. The chip with a novel design consists of an integrated ion filter and detector and is manufactured with MEMS technologies. The implemented concept of the IMS-Chip allows an easy and flexible adaption to a broad range of target applications. Environmental analysis represents a possible field of application for the IMS- hip....

P4.8 - Optimization of High-Quality-Factor Photonic Crystal Ring Resonator with Applications for fluid Sensing with 3D FDTD Simulation

R. Jannesari, B. Jakoby & T. Grille
This work introduces a design and analysis for a new photonic crystal ring resonator (PCRR) for gas sensing in the mid infrared (MIR) region. By combining a photonic crystal slow light waveguide and a photonic crystal resonator, we demonstrate a new method for optical absorption sensing. For this purpose, we propose a PCRR with higher interaction between guided mode and analyte. This can be done in a PCRR consisting of dielectric silicon rods surrounded by...

P4.10 - Component-level Measurement of Molded Freeform Optics - an Example for "Industrie 4.0" Concept

D. Hilbig, G. Gutierrez, T. Henning & F. Fleischmann
The concept of component-level performance characterization of optical elements is introduced as an example of optimizing product quality using "Industrie 4.0" approach. In this context, "product" denominates an assembly of components, usually provided by different suppliers. Quality of such a product will be predicted by modelling according to measured properties of real components. This is demonstrated on manufacturing of marine signal lights, composed of LED source, secondary optical element (SOE), housing and electronics. Molded freeform...

P4.7 - Crack luminescene as innovative method for detection of fatigue damage

R. Makris, J. Bronsert, F. Hille, D. Kirschberger & D. Sowietzki
Conventional methods of crack detection only provide a snapshot of the fatigue evolution at a specific location. The crack luminescence method realizes a clear visibility of the occurring cracks in loaded components during ongoing operation. Several different experiments show that due to the sensitive coating even the early stage of the crack formation can be detected what makes the crack luminescence helpful to determine the incipient crack opening behavior depending on load alternation. The crack...

P4.6 - Temperature Sensing in Underground Facilities by Raman-OFDR Using Fiber-Optic Communication Cables

M. Brüne, A. Pflitsch, W. Furian & W. Hill
Gaining information on climatic conditions in subway tunnels is the key to predicting the propagation of smoke or toxic gases in these infrastructures in the case of a fire or a terrorist attack. As anemometer measurements are not suitable, the employment f alternative monitoring methods is necessary. High-resolution temperature sensing with Raman-OFDR using optical communication fiber cables shows great potential as it allows the surveillance of several kilometers of underground transport facilities without the need...

P4.4 - Analysis and combination of different approaches for selective and directional thermal emission

G. Pühringer & B. Jakoby
There are many concepts providing narrowband and highly directional mid-infrared (mid-IR) thermal emission for integrated senor applications. In this contribution, we simulate the combination of two different concepts, each featuring individual signatures with respect to emission properties. The first concept is composed of an aperiodic multilayer stack of alternating dielectric layers (Si and SiO2) deposited on a planar metallic surface acting as heater ([1,2]). The dielectric double-layers either have quarter-wavelength (QW) thickness forming a Bragg...

P4.3 - UV-LED-Based Fluorescence and Reflectance Sensor System for Dermatological Diagnostics

E. Wyrwich, B. Seme, R. Skoczowsky, F. Stüpmann, M. Moschall, G. Khazaka & J. Schleusener
A fiber optical, UV-LED-based, spectroscopic fluorescence sensor system for diagnostic applications in dermatology has been developed and tested at excised human skin lesions. The system uses sbeen LEDs in the wavelength range 300...430 nm to excite autofluorescene of different fluorophores in human skin. Additionally, the skin's diffuse reflectance is measured by means of a tungsten halogen lamp to correct reabsorptions of the fluorescence emission in the skin itself. Moreover, the system includes a dermatoscope to...

P3.9 - IoT meets logistics Development of a mobile condition monitoring system

M. Heider, A. Rother & P. Hanesch
It is common to determine the position of goods via GPS in the delivery process, however the conditions of specific commodities are insufficiently tracked. Advances in communication technologies combined with development of low energy sensors offer several new possibilities in continuous online monitoring. To overcome the aforementioned problems, we investigated the delivery process in the field of roadworks. In this field there are numerous opportunities into which IoT can be implemented. For that reason we...

P3.7 - Integrated measurement units and sensor systems for harsh industrial applications

S. Grunwald & B. Bäker
This paper presents a low-cost methodology of how to integrate measurement units into fiberreinforced material. Part of this work depicts the manufacturing of encapsulated sensor nodes suitable for harsh industrial applications and enabling condition monitoring plus the collection of measurement values out of the material after the final fabrication of the product itself. Hermetically encapsulated sensor nodes equipped with wireless power supply enable the direct capture of measurement values without the need for additional wires...

P3.6 - Efficient Boost Converter for Thermoelectric Energy Harvesting

J.-M. Gruber & S. Mathis
This paper presents a new boost converter for thermoelectric energy harvesting. The output voltage is regulated at 3.6 V for use with embedded systems. The booster reaches high efficiency at low input voltages of few 10 mV. A first prototype operates at about 15 mV input voltage with an efficiency of 45%. At 120 mV input voltage the efficiency increases to 74%. Using a 30x30mm sized low cost thermoelectric generator (TEG) in combination with the...

P3.5 - Contact-free electro-magnetic reactance based mechanical tension sensors

A. Schwersenz, P. Cörlin, C. Leiser, T. Kitzler, T. Senkbeil, S. Schwiertz & L. May
Motion determines our life. Therefore it is crucial to know the forces we need to get in movement. It is possible to measure the mechanical tension in mechanical components like shafts and pull rods by electro-magnetic stimulation of the bulk material. Using inductive sensors in a specific geometric constellation to the transmitter the sensor signals can be used to measure torsional moments or tensile and compressive stress. The combination of planar coil systems, magnetic flux...

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  • 2017
    159
  • 2016
    184
  • 2015
    275
  • 2014
    55
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    290
  • 2012
    588
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    303
  • 2009
    195