2,602 Works

D5.4 - Mirco-Sensors for Automotive Liquid Properties Monitoring

H. Dobrinski, T. Eggers, J. Stürmann & M. Lindemann
Because of upcoming new emission regulations like Euro 6 or EPA10 the fuel efficiency, emissions and lifetime of modern combustion engines need to be increased by a sophisticated motor management. Additionally, an increased fuel admixtures of bioethanol or bio-diesel together with new technologies as for instance particle filters in the exhaust gas after treatment components of diesel engines become more and more important. To cover all of these new requirements a lot of parameters have...

P1BS.10 - A Novel Design of Cell-based Biosensors for Detecting Cell Acidification

P. Wang, T. Liang, Q. Wu, J. Tu, Y. Gan, Z. Qin & H. Wan
Cell metabolism is a common biological mechanism in living cells. Acidification plays an important role in cell metabolism, thus the extracellular pH change is used to indicate the vitality of cells. For extracellular detection of cell metabolic substances, light addressable potentiometric sensor (LAPS) has many advantages, such as high sensitivity, easy encapsulation, and perfect to make microchambers for cell experiments. LAPS is a spatially resolved biochemical sensor based on fieldeffect. Characteristic test experiments and cell...

WS.3 - Non-enzymatic glucose biosensors for smart wearables

S. Ortaboy, H. Long, S. DelaCruz, C. Carraro, R. Maboudian & G. Atun
With the increasing technology on wearable and smart devices, many researchers have focused on developing new materials for various applications utilizing scalable techniques. Among these applications, the electrochemical sensor platforms play an important role in areas such as the public healthcare, food industry, agriculture systems and clinical - medical industry. Utilization of carbon fiber (CC) based textiles as the sensing material has several advantages in electrochemical sensing applications due to their flexibility, high conductivity, porous...

P1GS.19 - Cobalt spinel via solution combustion synthesis as an ammonia sensing material

D. Ziegler, A. Marchisio, G. Ercolino, S. Specchia & J. M. Tulliani
Nano-crystalline cobalt oxide (Co3O4) was prepared by solution combustion synthesis (SCS) and used as ammonia sensing material. The obtained powder was characterized by laser granulometry, thermal analysis, X-ray diffraction, X-ray Photoelectron Spectroscopy, nitrogen adsorption (B.E.T -Brunnauer, Emmet, Teller- technique), Raman spectroscopy, field emission scanning electron microscopy and transmission electron microscopy. Sensors were screen-printed onto α-alumina substrates with platinum interdigitated electrodes and fired at 700°C for 1 h in air, after drying overnight. The sensor’s response...

ÜV4 - Wireless Sensor Networks: Status and Trends

Gerhard Fischerauer & Ralf Stöber
Wireless Sensor Networks (WSN) are distributed systems comprising a (possibly large) number of intelligent, energetically self-sufficient sensors communicating by radio waves. With them, the vision of an “intelligent environment” created by man could come true. The present contribution gives an overview of the fundamental challenges to be overcome when wireless sensor networks are to be realized, of the state of the art, and of current trends.

P2.4.22 Forest and Disordered Carbon Nanotubes: Sensitivity Improvement of Electrochemical Detection in Miniaturized Devices

I. Álvarez-Martos, R. Alonso-Bartolomé, A. Costa-García, M. T. Fernández-Abedul, A. Fernández-Gavela, J. Rodríguez-García, N. Campos-Alfaraz, A. B. García-Delgado & D. Gómez-Plaza
Miniaturization is a well-established trend in the development of analytical devices, due to the important advantages it offers. Detection for this type of devices has to be in accordance and therefore easy integration and the employment of simple instrumentation are common requirements. These are fulfilled very well by the electrochemical detection (ED) and therefore, it is gaining relevance in many of the applications where miniaturized approaches are required. However, the use of very small sample...

B2.2 - Electrode Design for Capacitive Sensors

H. Zangl
This paper presents a fast method for the design of electrode topologies of capacitive sensors with the aim to provide a good signal to noise ratio. Frequently, the initial electrode design for capacitive sensors is chosen according to the knowledge of an expert and optimization is done in time consuming experiments. An alternative approach is given by model based optimization using field computation software and standard optimization techniques. However, this is still a complex task...

8.2.2 A High Spatial Resolution MEA for Voltammetric Analysis of Trace Metals in Water Pollution Based on Partial Least Squares Regression

Hui Xin Zhao, Wei Cai, Hao Wan, Da Ha & Ping Wang
Estimation of heavy metals in water has been paid significant attention because of the toxicity of such metals on the whole ecological system. A microelectrode array (MEA) of individually addressable microelectrodes was fabricated for cadmium, lead and copper analysis in water pollution. The ratio of interelectrode distance to the electrode diameter of the MEA was sufficient enough to get a collective current response while maintaining the excellent features of single microelectrodes. Cyclic voltammograms made in...

BS6.2 - Biocompatible Gold Nanoclusters as Turn-off Biosensors

D. Ungor, I. Dekany & E. Csapo
Noble metal nanoparticles vs. nanoclusters The well-known biomolecules (eg. peptide, amino acid, nucleotide, etc.) are suitable for both direct preparation and stabilization of plasmonic Au NPs but the weight or molar ratios of the reactants have dominant role on the size and the optical feature. ...

P1BS.6 - Cell Culture Growth Monitoring using Disposable Electrochemical Enzymatic Sensors

P. Fanjul Bolado, M. M. P. S. Neves, M. B. González García & D. Hernández Santos
Determination of cell growth and viability is crucial for bioprocesses monitoring. Traditionally, the control of the cell culture growth is performed by cell counting, which can be a time-consuming procedure that requires an expert user. Thus, in order to take the cell culture control to the next level, electrochemical enzymatic sensors for the in-situ measurement of substrates and metabolites of interest in cell cultures were developed. Two of the most commonly monitored parameters are glucose,...

8.1.1 InGaN/GaN nanowire based opto-chemical sensor for detecting hydrogen and hydrocarbons at low temperature

Sumit Paul, Andreas Helwig, Gerhard Müller, Jörg Teubert & Martin Eickhoff
We report on InGaN/GaN nanowires (NWs) as opto-chemical transducers for the detection of H2 and hydrocarbons. The NWs exhibit a strong photoluminescence (PL) which persists up to temperatures of 150°C and above. The GaN/InGaN NWs were grown by plasma-assisted molecular beam epitaxy on low-resistivity n-type Si (111) substrates and covered with a semitransparent catalytic Pt-coating after deposition. With the thin Pt coating on top, the PL intensity is dependent on the concentration of hydrogen or...

A8.3 - Embedded surface-pressure measurement with flexible piezoelectric thin-film sensors

M. Dimitrov, D. Stapp, D. Ertogrul, P. Kieper & U. Konigorski
Flexible thin-film piezoelectric polymer sensor arrays have been proposed in several scientific applications since the early 2000s. Across domains, research has proven that these sensor systems include considerable innovation potential by overriding existing application barriers and cost reduction. Nevertheless, this sensor technology has not yet been industrialized to a large scale industrial appliance or even mass production. Rather, there appears to be a large gap in experience and systematic knowledge compared to conventional piezoelectric sensors....

1.1.1 Sensors for Fossil Energy Applications in Harsh Environments

Susan M. Maley & Robert R. Romanosky
Advancements in energy generation technology are poised to offer environmentally sustainable alternatives when compared to mid century combustion/steam systems. Using emerging clean energy technologies, coal and other fossil fuel based processes can operate at high efficiencies, be integrated with carbon management platforms, and offer power that is reliable and reasonably priced. To achieve the goals and demands of clean energy, the conditions under which fossil fuels are currently converted into heat and power are extremely...

B3.2 - Sensors Based on Tunnel Magnetoresistance - New Technology, New Opportunities

J. Paul, C. Schnieders, J. Traute, R. Lehndorff, A. Conca, B. Leven, B. Hillebrands, F. Casper, G. Jakob & M. Kläui
Magnetoresistive sensors based on the tunnel magnetoresistance effect penetrate more and more the sensor market. They provide high signal amplitude which enables the use of microcontrollers or ASICs without expensive preamplifiers. In addition high-impedance sensors can be designed with little chip area consumption. The combination of these two properties makes TMR sensors ideally suited for battery powered applications. Reliability issues, mainly the long term stability of the ultrathin barrier layer are solved. Angle and position...

3.3.2 Gas Sensing Properties of Pulsed Laser Deposited Vanadium Oxide Thin Films

Joni Huotari, Anita Lloyd Spetz & Jyrki Lappalaien
Vanadium oxide thin films were fabricated by pulsed laser deposition (PLD). The crystal structure and symmetry of the deposited films was studied with X-ray diffraction (XRD) and Raman spectroscopy, respectively. The surface morphology was studied with atomic force microscope (AFM). The thin films consisted mostly of V2O5 phase of vanadium oxides, but also of another phase, which is generally found in form of nanotubes. The measured optical transmission spectra of the films also supported the...

4.1 - Non-intrusive In-flight Propeller Blade Deformation Measurements by Means of a Rotating Camera

F. Boden & B. Stasicki
The Image Pattern Correlation Technique (IPCT) is a powerful optical tool to measure the surface shape and deformation of aircraft structures, e.g. wings, propeller or rotor blades, non-intrusively in flight. The latest development of this technique is its application to 360° propeller deformation measurements. Therefore a special stereo camera system rotating with the propeller at its full rotational speed was designed, whereby the system was exposed to extreme vibration and centrifugal forces. By beginning of...

Partikelmessung an hochkonzentrierten Dispersionen nach dem Ultraschall-Reflexionsprinzip

R. Weser, B. Wessely, S. Wöckel & U. Hempel
Für eine Vielzahl von Anwendungen in der Verfahrenstechnik, Biotechnologie oder Lebensmittelindustrie ist die Charakterisierung der Feststoffphase in hochkonzentrierten Dispersionen anhand der Partikelgrößenverteilung und -konzentration von wesentlicher Bedeutung. Die online bzw. inline gewonnenen Daten können dazu beitragen, die verschiedenen verfahrenstechnischen Prozesse optimal zu steuern, Produktqualitäten gezielt zu steigern oder Anlagenverfügbarkeiten zu erhöhen. Exemplarische Vorgänge wie die Emulgierung und (Nass-)Zerkleinerung finden sich in einer Vielzahl industriell relevanter Prozesse, wie beispielsweise der Herstellung von Lacken und Farben oder...

P1.3 Messgenauigkeit von kalorimetrischen Massenstromsensoren

P. Otto, S. Hillbrich & H.-J. Postberg
Der physikalische Grundeffekt der modernen kalorimetrischen Massenstromsensoren beruht auf einem beheizten Sensorelement (Film, Keramik, Glas etc.), dessen elektrischer Widerstand von der Temperatur abhängt. Durch die Umströmung des Sensorelements im Medium findet ein lokaler Wärmetransport statt, welcher mit dem Massenstrom (kg/s) bzw. der Strömungsgeschwindigkeit korreliert (m/s). Bei der Messung kompressibler Medien, wie beispielsweise Luft, wird zur Umrechnung auf Nm/s die Mediumstemperatur zur Kompensation parallel gemessen. Eine Messung des Absolutdrucks zur Druckkompensation entfällt, da bei Druck >...

P9 - Applying CEAS Method to Investigation of NO and N2O Absorption Lines in Infrared Spectra

R. Mędrzycki, J. Mikołajczyk, J. Wojtas, Z. Bielecki & D. Szabra
The paper presents a project of the system designed to NO and N2O absorption coefficients measurements. In the system was applied one of the most sensitive optoelectronic gas detection technique - Cavity Enhanced Absorption Spectroscopy (CEAS). The absorption coefficient is determined by measurements of decay time of a laser pulse reflected inside an optical cavity. The measurement procedure consists of two steps. First, in case of lack of tested gas, decay time is determined. It...

F13 - Miniaturisierter energieautarker binärer Sensor auf Basis von feuchtigkeitsempfindlichen Hydrogelen

T. Frank, A. Cyriax, A. Steinke, C. Bellmann, G. Gerlach, R. Sarwar & H. F. Schlaak
Dieser Artikel präsentiert ein Konzept zum energieeffizienten Betreiben autonom vernetzter Sensornetzwerke. Diese benötigen für einen 24/7 Betrieb ein angepasstes Energiemanagement. Durch die entwickelten leistungslosen binären Mikroschalter wird ein eventabhängiges Einschalten des jeweiligen Sensorknotens erreicht. Die Plattform ist für unterschiedliche Messgrößen geeignet. Die direkt aus der Messgröße gewonnene mechanische Energie schaltet im einfachsten Fall mechanisch zwei elektrische Kontakte. Die Funktion wir hier am Beispiel eines realisierten Schwellwertschalters für die relative Luftfeuchtigkeit der Umgebungsluft dokumentiert. Als sensitives...

C7.3 - From Optochemical Sensors for Industrial Processes to Large-Area Printing of Sensor Systems Integrated with Organic Electronics

St. Köstler, E. Kraker, M. Sagmeister, B. Lamprecht, A. Bizzari, B. Stadlober, B. Ribitsch, T. Abel & T. Mayr
The importance of sensors to determine chemical and biochemical parameters increases steadily in different fields of applications. Fast and reliable sensors are demanded e.g. for process control in industry, biotechnology, patient monitoring and diagnostics, or environmental monitoring Many optical chemosensors rely on luminescence detection where the change in luminescence of an indicator dye doped film in the presence of an analyte (e.g. O2, CO2, pH, …) is detected by an optical system. We report on...

P1.6 - One-dimensional Orientation Using a Low-cost Inertial Sensor

M. Haid, T. Chobtrong, M. Kamil & E. Günes
This paper presents one-dimensional attitude estimation using a low-cost gyroscope with help of shaping filter for industry applications. This algorithm is a part of controller module, which will be implemented in an intelligent wrench for automotive manufacturing. The orientation is primary estimated by the signals of a low-cost pinpoint gyroscope. With help of an error model based on Shaping filter method, the optimal 1-D orientation of an object is determined by compensating the estimated orientation...

P2EC.8 - Iron (III)-Selective Sensor Based on Modified Glassy Carbon Electrode

N. Mecheri
The aim of this work is intended to make a comparison between the effects of the presence of potassium ferricyanide (K3[Fe(CN)6]) / potassium ferrocyanide K4[Fe(CN)6]) and the absence of any redox couple for iron (III) determination in aqueous solution using modified Glassy Carbon Electrode. Benzo-18-crown-6 is employed as ionophores for preparing PVC-based membrane sensors selective to iron (III), plasticized with Di-n-octyl phthalate, Tetrabutylammonium tetraphenylborate was used as additive. The measurements performed and characterized by square...

P7.7 - Cyclovoltammetrische Bestimmung redoxaktiver Gase mittels eines Festelektrolytsensors

M. Schelter, J. Zosel, W. Oelßner, U. Guth & M. Mertig
Systematische Untersuchungen zur Cyclovoltammetrie wurden an einem kommerziell verfügbaren Festelektrolytsensor im Durchflussmodus durchgeführt. Dabei wurden die Einflussgrößen Zelltemperatur, Elektrodengröße und Potentialvorschubgeschwindigkeit variiert und Bedingungen gefunden, bei denen es für H2-, CO- bzw. O2-haltige Messgase zur Peakausbildung im Messsignal kommt. Im unteren Konzentrationsbereich gibt es für jedes dieser Gase einen linearen Zusammenhang zwischen der Konzentration und den auswertbaren Peakeigenschaften Höhe und Fläche. Für H2 ist das der Bereich bis 100 Vol.-ppm und für CO der bis...

P1.5.2 Combined Amperometric/Field-Effect Sensor for the Detection of Dissolved Hydrogen in Biogas Reactors

C. Huck, A. Poghossian, M. J. Schöning & P. Wagner
A one-chip integrated combined amperometric/field-effect sensor for monitoring the dissolved hydrogen (H2) concentration has been developed for biogas applications. The combination of two different transducer principles might allow a more accurate and reliable measurement of dissolved H2 as an early warning indicator of digester failures. The proposed approach has been demonstrated by simultaneous amperometric/field-effect measurements of dissolved H2 concentration in electrolyte solutions. Both, the amperometric and the field-effect transducer show a linear response in the...

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