2,770 Works

P2GS.12 - Pd-SnO2 Micro-reactor Sensing Film with a Catalytic Co3O4 Overlayer for Ultraselective Detection of Sub-ppmlevel Benzene

S.-Y. Jeong, J.-W. Yoon, T.-H. Kim, H.-M. Jeong, C.-S. Lee, Y. Chan Kang & J.-H. Lee
Benzene, one of the most toxic and ubiquitous gases, is known to induce serious disease such as leukemia and aplastic anemia. Hence, precise detection of carcinogenic benzene is very important for monitoring of air quality and to protect human being. Unfortunately, n-type oxide semiconductor gas sensors show low responses to chemically stable BTX gases (benzene, toluene, and xylene). Moreover, similar chemical structure of BTX gases hamper their discrimination by chemiresistive variation. In this contribution, we...

P2EC.13 - Gold Screen-printed Electrodes as detectors of reducing sugars in batch and FIA systems

P. Fanjul Bolado, M. Neves, M. Begoña González García & D. Hernández Santos
The development of user-friendly, time-saving and cost-effective analytical strategies for the detection and quality control of carbohydrates in food industry is continuously highly demanded. Therefore, in this work, two strategies for the non-enzymatic detection of reducing sugars (glucose and fructose), employing miniaturized screen-printed gold electrodes, were proposed. On the one hand, a high-throughput flow-injection analysis (FIA) system that employed gold electrodes integrated in a one channel flow-cell was developed. The injection of sample volume (60...

P4.2 - Tunable Diode Laser Spectrometry (TDLS) - Challenges in NH3 Measurements in Hot and Humid Exhaust Gas

A. Seifert, M. Studer & Th. Hessler
In power generation, as well as in automotive emission control, NOx can be reduced by 99% with Selective Catalytic Reduction (SCR), where ammonia (NH3) or urea is injected into the exhaust gas and reacts over a catalyst with NOx o nitrogen and water. This process needs to be controlled well in order to reduce “ammonia slip”, which is the target of increasingly stringent emission control requirements. Due to the residual content of ammonia in the...

BS2.4 - Biosensors for Pesticides detection in Food

C. Moldovan, B. Firtat, S. Dinulescu, C. Brasoveanu, M. Ion, M. Savin, C. Mihailescu & D. Stan
The paper is presenting the work related to development of a fully integrated platform for pesticides detection based on amperometric Achetilcholinesteraze (AChE) enzyme biosensors, to be used in food monitoring giving quantitative information on the organophosphate and carbamate pesticides. The sensor design, fabrication, and characterisation and the platform components and functioning will be presented.

P7 - Background-Corrected Determination of Optical Properties in the Far Infrared Range up to 1 mm

M. Kehrt & C. Monte
The optical properties transmittance and reflectance of materials are defined as the flux of radiation reflected from or transmitted through a sample with respect to the incident flux. Usual measurement approaches for these quantities follow these definitions and determine the quotient of the reflected or transmitted flux with respect to the incident flux. However, in the Mid and Far Infrared Range (MIR and FIR) this approach might easily lead to wrong results because background radiation...

4.2.6 Comparison of LabelFree ACh Image Sensors Based on CCD and LAPS

Shoko Takenaga, Kazuaki Sawada, Carl Frederik Werner & Michael J. Schöning
Semiconductor-based chemical image sensors, like the pH-image sensor based on a charge-coupled device (CCD) or the light-addressable potentiometric sensor (LAPS), are becoming a powerful tool for label-free imaging of biological phenomena. We have proposed a polyion-based enzymatic membrane to develop an acetylcholine (ACh)-image sensor for neural cell activity observations. In this study, a CCD-type ACh image sensor and a LAPStype ACh image sensor were fabricated and the prospect of both sensors was clarified by making...

P1AP.2 - NOx sensor for exhaust applications

J. Lattus, G. Hagen, J. Kita, R. Moos, D. Bleicker & F. Noack
Modern exhaust gas aftertreatment systems need robust and reliable sensors for in-situ control. We present a novel gas sensor that is easy to manufacture and should provide sufficient long-term stability. The impedimetric device is based on gas-depended electrical changes of a NOx storage material, operated at higher temperatures in an equilibrium state. Experimental results demonstrate a stable baseline of the signal, high NOx sensitivity and good NOx selectivity regarding the missing influence of several typical...

10 - EuNetAir Air Quality Joint-Exercise Intercomparison: Assessment of Microsensors Versus Reference Methods

C. Borrego, A. M. Costa, J. Ginja, M. Amorim & K. Karatzas
The 1st EuNetAir Air Quality Joint-Exercise Intercomparison organized in Aveiro (Portugal) from 13-27 October 2014 focused on the evaluation and assessment of environmental gas/PM and meteorology microsensors versus standardised air quality referenced methods through an experimental urban air quality monitoring campaign. The IDAD Air Quality Mobile Laboratory was placed at an urban traffic location in Aveiro city centre to conduct continuous measurements with standardized equipment and referenced analysers of the following variables: CO, NOx, O3,...

P2.11 - Lichtbasierter Sensor zur kontinuierlichen Bestimmung von Chlordioxid

S. Holz & A. Glukhovskoy
Im Rahmen des Projektes "Lichtbasierte Analytik zur Bestimmung der Konzentration von Chlordioxid" (LAClO2) wurde ein neuartiger Sensor zur Überwachung der Aufbereitung von Brauch-, Prozess- und Trinkwasser entwickelt und hergestellt. Im Wesentlichen zeichnet sich der Sensor neben seiner hervorragenden Integrierbarkeit in die vorhandene Anlagentechnik und EDV Struktur, durch die hohe Breitbandtauglichkeit und Kompaktheit des Systems aus. Das patentierte photometrische Messsystem erlaubt eine sehr genaue pH- und temperaturunabhängige und somit besonders resiliente Erfassung der Chlordioxidkonzentration. Die praktische...

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.

IP6 - Infinitely adjustable attenuation cell for infrared radiation to fit the metering capacity to different object temperatures

Hans-Georg Rademacher
In this work a method is described, which allows the extension of measurement prospects of the metering capacity of an infrared camera system. In the following examples a high-speed infrared camera with a MCT-sensor (3-5μm spectral response) and a frame rate of 885 pictures per seconds is used. This type of camera is not equipped with temperature measurement like standard thermography cameras. Its major task is to detect small changes in the radiation intensity. To...

5.3.1 Key design elements of a radio-acoustic-sounding system for industrial applications

D. Exel, B. Zagar, S. Schuster, S. Scheiblhofer, D. Zankl, V. Ganglberger & J. Reisinger
This article discusses compact radio-acoustic-sounding systems (RASSs) for industrial applications. The electromagnetic-acoustic interaction enables to measure temperatures of gases without contact and spatially resolved. For this purpose, the speed of a modulated sound pulse, travelling through the gas with a velocity proportional to the temperature, is determined with a Doppler radar. The optimum sound pulse´s in terms of its frequency is discussed. The so called Bragg condition is essential to obtain sufficient receive power. The...

P9 - Compact, Photoacoustic Gas Measuring System for Methane in Biogas Plants

J. Huber, A. Eberhardt & J. Wöllenstein
We present a miniaturized photoacoustic gas measurement setup for methane in high concentrations. The system consists of an IR-source, a microphone as detection unit and a measuring chamber with gas connections. The system is able to detect methane concentrations of 0-100%, as they exist for example inside the reaction chamber of biogas plants. Simulations with parameter variations are done to evaluate experimental results. Measurements and simulations show similar behaviour. Different measurement ranges have been regarded....

C5.4 - Characterization and Identification of Diesel Fuels, Biodiesel and their Blends by Time-Resolved Laser- Induced Fluorescence Spectroscopy

Z. Fan & J. Krahl
A method based on time-resolved laser-induced fluorescence spectroscopy (TRLFS) for characterization and identification of different fossil diesel fuels, biodiesel and theirs blends is introduced. The method uses a pulsed Nd:YAG laser with an excitation at 266nm and a single nanosecond pulse, measuring the dynamic response with a specific time gate width and gate step (time-resolved), and comparing them in terms of 3D-shapes, frequency behavior and decay behavior. The method also takes into account the maximal...

5.1.3 - Automatisierte Kalibrierung eines Gonioreflektometers zum Messen der BRDF

A. W. Winkler & B. G. Zagar
Ein Gonioreflektometer ist ein Gerät zum Messen der Bidirektionalen Reflektanzverteilungsfunktion (BRDF) und besteht im Allgemeinen aus einer Lichtquelle, einem lichtempfindlichen Detektor und einer Aufnahme für die Probe. Für ein solches, im Labor aufgebautes Gerät werden zwei Kalibrierverfahren vorgestellt: Eines zur Bestimmung der intrinsischen Parameter der als Detektor verwendeten Kamera, der Konstruktionsparameter des als Probenaufnahme verwendeten sphärischen Gelenks und der relativen Lage und Orientierung zwischen Kamera und Gelenk und ein zweites Verfahren zur Bestimmung der Position...

1.1.5 Detection of coke deposits on a fixed-bed catalyst by a contactless microwave method: first measurements

Dieter Rauch, Peter Fremerey, Ralf Moos & Andreas Jess
The aim of this work is to investigate a novel contactless in-operando microwave-based measurement technique for the detection of coke deposits in industrial fixed-bed catalysts. Their steel reactors serve as cavity resonators for microwaves. Due to coke loading, the electrical conductivity of the catalyst pellets increases strongly. This leads to changes in the resonance behavior that are mirrored by the scattering parameters. The regeneration of the coked catalyst by coke burn-off is examined as well.

3.4.4 Adaptiver Laser-Doppler-Distanzsensor mit erweitertem Messbereich durch Einsatz einer Linse mit elektrisch veränderlicher Brennweite

R. Kuschmierz, Ch. Linde, T. Pfister, L. Büttner & J. Czarske
In der Prozessmesstechnik existiert eine große Bandbreite optischer Sensoren für Distanzmessungen an technischen Oberflächen. Da diese nichtinvasiv arbeiten, eignen sie sich insbesondere für die Messung an bewegten Objekten. Die Messbereichslänge sowie der Arbeitsabstand sind dabei durch den Aufbau des Messkopfes gegeben. Sollen mit einem Sensor Messaufgaben ausgeführt werden, deren geforderte Messbereichslängen sich stark unterscheidenden, so ist ein Sensor mit der größten notwendigen Messbereichslänge zu wählen. Da für eine Vielzahl der zu Grunde liegenden Messprinzipien die...

P2.04 - Entwicklung von piezoresistiven Hydrogelsensoren zum Nachweis von Ethanol

J. Erfkamp, M. Günther & G. Gerlach
Der Beitrag beschreibt einen kostengünstigen Sensor zur Detektion von Ethanol, z.B. in Alkoholika, der alkoholsensitive Hydrogele aus Acrylamid und Bisacrylamid mit piezoresistiven Sensoren kombiniert. Dabei wird die reversible Quellung bzw. Entquellung des Hydrogels gezeigt, welche Voraussetzung für einen reproduzierbaren Betrieb des Sensors ist. Weitere Faktoren wie der Einfluss der Acrylamid- und Bisacrylamid-Konzentration auf die Sensitivität und die mechanische Stabilität des Hydrogels sowie die Selektivität des Hydrogels gegenüber weiteren Alkoholen werden dargelegt. Erste Messungen in piezoresistiven...

5.3 - Using LTE-networks for UAS-communication

F. Maiwald & A. Schulte
This article discusses the usage of Long-Term Evolution (LTE) as IP-datalink for one or multiple micro unmanned aircraft systems (UAS). LTE offers robust coding schemes as well as very high sensitivity of receivers. In environments of highly limited transmit power, LTE therefore promises much better coverage in comparison to commercially applied UAS-datalinks like Wi-Fi or Lightbridge (DJI). Within this article, two commercial LTE-networks are evaluated and necessary IT-infrastructure for communication with UAS is specified. We...

6.2 - Fortgeschrittene biomolekülbasierte Architekturen auf Elektroden für die Entwicklung neuartiger Biosensoren

S. Feifel & F. Lisdat
Aus drei unterschiedlichen Proteinkomponenten wurden vier supramolekulare Proteinarchitekturen auf Elektroden für den selektiven Substratnachweis aufgebaut. Der supramolekulare Aufbau im Multischichtformat wird durch das Einbetten eines Redoxproteins (Cytochrom c) sowie zweier unterschiedlicher Enzyme (Cellobiosedehydrogenase und Laccase) mittels carboxymodifizierter Siliziumdioxidnanopartikeln realisiert. Die unterschiedlichen Multiproteinsysteme ermöglichen jeweils die Einzeldetektion als auch in dem Triproteinsystem eine duale Detektion zweier unterschiedlicher Analyte: Laktose und Sauerstoff. Die Kontrolle der Enzymaktivität – das heißt, das selektive Anschalten der Bioelektrokatalyse – wird durch...

P9.6 - Verfahren zur Greifprozessüberwachung fluidischer Sensor-Aktor-Elemente in der Automation

A. Defranceski & B. Kern
Die Messung der Unterdruckkennlinie während der Evakuierung von fluidischen Aktoren ermöglicht eine Prozessüberwachung ohne zusätzliche Sensorik. Dadurch wird der fluidische Aktor zu einem Sensor-Aktor-Element, dessen Evakuierungskennlinie zum einen auf die Ausdehnung des Aktors selbst zurückzuführen ist, zum anderen die vom Aktor ausgehende Kraft repräsentiert. Die Kenntnisse über den Zusammenhang der Vakuumkennlinie mit der Ausdehnung und Kraftausleitung des Aktors eröffnet bei der Verwendung fluidischer Sensor-Aktor-Elemente innerhalb von automatisierten Greifprozessen einfache und effiziente Möglichkeiten zur Greifprozessüberwachung. Fluidische...

P2NG.11 - PdO/Polyaniline nanocomposite for room temperature hydrogen sensing application

K. Arora & N. K. Puri
This work reports the synthesis of palladium oxide (PdO)/polyaniline nanocomposites with their application as highly sensitive, stable and selective hydrogen gas sensing materials. Pristine polyaniline is synthesized using economical and facile chemical synthetic route and it is loaded with different weight percentage (1 wt%, 2 wt%, 5 wt% and 10 wt%) of PdO via simple sol-gel process. The crystallographic properties, shape and size of synthesized polyaniline and its nanocomposites are characterized using X-ray diffraction (XRD)...

P1MM.3 - Solution-Gated Graphene FET DNA sensor for using unique coplanar gate structure integrated in the microfluidic chip

H. E. Kim, J. H. Lee, A. Schuck & Y.-S. Kim
In this work, we have developed a solution-gated graphene field effect transistors (SGGFETs) for sensing single-stranded DNA by unique coplanar gate structure design. Coplanar electrodes and graphene active layer are all exposed outside the plane to integrate with microfluidic chip. Integrating the microfluidic into the FETs, a certain amount and path of the DNA solution can be controlled optionally by microfluidic channel. [1] The probe DNA (10 μM) was injected through the microfluidic channel and...

P1NM.2 - Electrochemical hydrazine sensor based on atomically-thin sub-nanometer WO3 developed by atomic layer deposition

S. Zhuiykov, Z. Wei, Z. Hai & M. Karbalaei Akbari
Wafer-scale two-dimensional (2D) WO3 films with the different thicknesses of 0.78, 1.4, 3.6 and 6.5 nm were fabricated on Au-SiO2/Si substrates by atomic layer deposition (ALD) technique. The surface morphologies and chemical components characterization results showed that WO3 films were aggregated with nanoparticles with the average diameter of 40 nm. The electrochemical behaviors of 2D WO3 films with the different thicknesses towards the hydrazine detection at various conditions and the effect of the thickness on...

DH2.6 - Acetone Bio-sniffer (YSZ-based Electrochemical Gas Phase Biosensor) toward Diagnosis of Diabetes

X. Hao, X. Liang & G. Lu
Acetone bio-sniffer, because of its ability of continuous non-invasive monitoring, is recognized as a potential method for the diagnosis of diabetes. In this study, mixed potential electrochemical sensors based on YSZ and K2NiF4 -type oxides Sm2-xSrxNiO4 (x= 0.4, 0.6 and 0.8) sensing electrode were fabricated as bio-sniffer for diagnosis of diabetics by detecting acetone concentration in exhaled breath. The results showed that when Sm1.4Sr0.6NiO4 was used as sensing material, the fabricated sensor exhibited the best...

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