219 Works

2.2 - Kalibrierung von Thermometern in situ im Prozess

M. Schalles & P. Vrdoljak
Im Bereich der Life-Sciences-Technology müssen Prozessthermometer aufgrund regulatorischer Anforderungen regelmäßig kalibriert werden. Derzeit müssen diese aus dem Prozess ausgebaut und extern kalibriert werden, was, bedingt durch die Kalibrierung oder auch durch Prozessstillstände, sowohl zu hohen Aufwänden, als auch zu hohen Kosten führt. Um diese Kosten zu minimieren und die Prozesssicherheit zu erhöhen, wurde ein Kalibrierverfahren entwickelt, welches eine kontinuierliche Einpunktkalibrierung eines Thermometers direkt im Prozess ermöglicht. Diese in-situ-Kalibrierung erfolgt dabei mit Hilfe eines in das...

3.3 - Impedimetrische Untersuchungen an Elektroden Elektrochemischer CO2-Sensoren

S. Dietrich, M. Kusnezoff, S. Mosch, C. Baumgärtner & N. Trofimenko
Am Fraunhofer-IKTS wurde ein elektrochemischer CO2-Sensor in kompakter Bauweise entwickelt. Der Sensor zeigt ein sehr gutes Ansprechverhalten auf CO2-Konzentrationsänderungen im Bereich 0,04..10 Vol.-% in synthetischer Luft. Zur Untersuchung des Einflusses der Elektroden auf die signalbildenden Prozesse wurden impedimetrische Untersuchungen an Testzellen mit vereinfachtem Aufbau durchgeführt.

A7.1 - Selective solid electrolyte sensors for trace gas concentrations

J. Zosel, M. Schelter, C. Vonau, U. Guth & M. Mertig
The measurement of a variety of combustibles such as hydrocarbons (HC), carbon monoxide and hydrogen is an important task for the evaluation of combustion and industrial processes. Solid electrolyte gas sensors based on yttria-stabilized zirconia (YSZ) are suited for many of these applications due to their broad measuring range, short response time and outstanding long-term stability. Their selectivity for single analytes in complex matrices however often needs significant improvement. In this contribution, different approaches for...

D6.2 - Characterisation of a 5 MN·m Torque Transducer by Combining Traditional Calibration and Finite Element Method Simulations

P. Weidinger, C. Schlegel, G. Foyer & R. Kumme
Precise torque measurement in nacelle test benches increases the demand for an expansion of the torque measurement range up to several MN·m and a torque transfer standard. To this end, a 5 MN·m torque transducer was acquired. However, a traceable torque calibration is only possible up to 1.1 MN·m so far. This calibration is presented and discussed in this paper. In order to fully characterise the 5 MN·m torque transfer standard, a finite element analysis...

D1.3 - Embedded sensing: making the best of 3D printed sensors

G. J. M. Krijnen, A. Dijkshoorn, P. Werkman, M. Welleweerd, G. Wolterink, J. Delamare & R. Sanders
Current Additive Manufacturing allows for the implementation of electrically interrogated 3D printed sensors. In this contribution various technologies, sensing principles and applications are discussed. We will give both an overview of some of the sensors presented in literature as well as some of our own 3D printed sensors work.

D6.3 - Intensity based optical measurement of cornea vibration

J. Osmers, M. Sorg & A. Fischer
In order to measure the dynamic behavior of eyes for yielding the intraocular pressure an optical, intensity-based sensor approach is developed. The challenge is to emit less than 1 mW of power to avoid harming the eye while coping with the low reflection of the eye of 4% for normal incidence. With solely analog infrared diodes and phototransistors the vibration of the cornea of an enucleated porcine eye is demonstrated to be detectable for the...

P3.05 - Reduktion der Ansprechzeit Hydrogel-basierter Sensoren

S. Binder, A. T. Krause & G. Gerlach
Die Leistungsfähigkeit Hydrogel-basierter Sensoren im Vergleich zu herkömmlichen biochemischen Sensoren ist bislang vor allem durch deren lange Ansprechzeiten eingeschränkt. Ursache der hohen Zeitkonstanten sind die für Polymere bzw. Hydrogele typischen Diffusionsprozesse, welche beim Quellen und Entquellen des Hydrogels als chemomechanischem Wandler zum Tragen kommen. In dieser Arbeit soll die Anwendung der Kraftkompensationsmethode dem entgegenwirken. Dazu wird in Verbindung mit einem MEMS-Drucksensor als mechanoelektrischem Wandler eine neue Methode der Kraftkompensation vorgestellt. Grundlage dieses Ansatzes bildet ein...

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...

P2.1 - Novel simulation algorithms for developing measuring techniques for multichannel ultrasonic microscopy

E. Kühnicke & M. Wolf
New ultrasonic measuring techniques use information from local distribution of reflected waves gained with arrays. As they are taking the wave behavior of sound into account, simple geometric models are not sufficient to understand the dependence between quantities being measured directly and these quantities being of interest, like sound velocity in media or the geometry of a specimen. To get this understanding, sound field simulations are necessary which allow to derive evaluation algorithm and to...

D6.4 - Pressure Sensor for Remote Readout in Aqueous Environment

M. Gerken & T. Karrock
Implantable intraocular pressure sensors are of high interest for early diagnosis of glaucoma. We propose a miniaturized, remote-readout, pressure-sensitive element that can be integrated into an artificial intraocular lens. A reference volume is sealed with a flexible photonic-crystal membrane. The optical spectrum reflected from this nanostructured waveguide depends on the incidence angle. A deformation of the membrane is calculated from an RGB image. Signal drift is a challenge with this type of membrane sensor. Here,...

B5.3 - High-Resolution Laser-Vibrometer Microscopy

C. Rembe & R. Kowarsch
Precise high-frequency electronics, as for example in smart phones, require advanced filters based on micro- or even nanoelectromechanical (MEM or NEM) resonators. MEM or NEM resonators excite high resonance frequencies in the GHz range at complex 3D-modes. The vibration transfer characteristic, the mode shapes, and the energy flow of acoustic waves are important to understand electrical transfer characteristic and damping influences. Heterodyne Interferometer Microscopes are an excellent widely used tool for out-of-plane vibrations. However, frequency...

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...

1.3 - Enhanced Pyroelectric Linear Arrays for Infrared Spectroscopy

R. Köhler, D. Wassilew, G. Hofmann, V. Norkus & M. Schossig
Pyroelectric linear arrays can be used in dispersive sensor systems for analysis of chemical substances. Due to their outstanding properties, such as high signal-to-noise-ratio, low drift effects and a wide spectral range of sensitivity, lithium tantalate sensors PYROSENS, manufactured by DIAS Infrared GmbH, are particularly suitable. In the last several years, design and manufacturing technology of these linear arrays has been improved significantly to meet the demands of spectroscopy even better. At constant element pitch...

A1.2 - Surprising advances in magnetic encoder performance - do not expert only better accuracy

T. Becker, T. Materne & S. Cardoso De Freitas
Magnetic encoders have been viewed as low end solutions for many years. German BOGEN Electronic GmbH, reknown for highly accuracte magnetic scales, and the Portuguese INESC institute have teamed up in the European innovation project tuMaPos to improve magnetic encoder accuracy. The first products from the tuMaPos project have now achieved accuracy levels which surpass low end optical encoder performance, while retaining the cost and technical advantages of magnetic measurement. In parallel other new advantages...

P2.08 - Advanced inertial position tracking of sensor particles in fluid flows of large industrial containers

S. S. Arefin, S. F. Reinecke & U. Hampel
In this paper, a concept for inertial position tracking of flow following sensor particles based on data fusion of inertial sensors is presented. The employed data fusion technique is quaternion based and uses an extended Kalman filter algorithm. A generalized sensor system kinematics has been developed to test the filter algorithm where three data conditions have been considered. Eventually, first simulation results are compared which shows the performance of the filter regarding sensor drift and...

A3.2 - Enzyme free sensor based on affinity viscosimetry for detection of glucose

T. Liebscher, F. Glös, A. Böhme, A. Foitzik, M. Birkholz, M. Di Vona & F. De Matteis
The growing demand of miniaturization of cell cultivation new approaches towards measuring and sensing bio-analytes need to be addressed to overcome the challenge of small volumes (less than 150μl) containing small amounts of analytes. Most of the available glucose sensors monitor the glucose concentration with the help of enzymes, which become very unstable in terms of long time measurement and consume glucose during the measurement becoming not available anymore for the cells. Therefore, the focus...

P2.02 - Entwicklung von optisch aktiven Hydrogelsensorelementen zum Nachweis von pH-Wertänderung

C. Kroh, M. Günther, G. Gerlach & T. Härtling
In vielen Industriezweigen wächst gegenwärtig der Bedarf für die Inline-Überwachung von Parametern in flüssigen Medien. Ein Ansatz dafür ist das Auslesen entsprechender Parameteränderungen, wie z.B. des pH-Wertes, über ein optisches Messsystem. In diesem Beitrag wird dafür ein kostengünstiges, nanostrukturiertes Sensorsubstrat vorgestellt, welches mit Nanoimprint-Lithografie hergestellt wird und das mit einem pH-sensitiven Hydrogel beschichtet ist. Das Hydrogel quillt in einem bestimmten pH-Bereich proportional zum pH-Wert und bietet somit die Möglichkeit auftretende Brechzahlveränderungen über die plasmonische Sensorfläche,...

P1.1 - Manufacture of electrodes entirely made of modified PDMS

R. Ruff, A. Brensing & K.-P. Hoffmann
Materials with different mechanical characteristics are used for common flexible electrodes. These differences limit their long term usability as interface to biological tissue. In this paper a manufacturing process for structural compatible PDMS electrodes is described. Issues like the adhesion between the components, the Young's moduli of the materials as well as the contacting process were addressed. Direct cell contact tests provided the evidence of cell compatibility. By recording electromyograms (EMG) and the evaluation of...

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...

P4.07 - Funktionserhaltende Immobilisierung RFP-exprimierender Sensorhefen in transparente Spot-Arrays aus Silikat-Biopolymer Kompositgelen

U. Soltmann, G. Rode, H. Haufe, L. Schuster, H. Börnick & E. Worch
Vorgestellt werden Ergebnisse zur Nutzung von SiO2-Alginat-Gelen zur funktionserhaltenden Immobilisierung von Sensorhefen in Array- oder Schichtstrukturen, über die eine einfache Integration von Sensorzellen in die technische Sensorumgebung gewährleistet werden soll. Zielstellung war die Realisierung einer gezielten, ortsfesten Ablage von Sensorzellen bei Gewährleistung einer hohen Transparenz der Gelmatrix, Erhalt einer hohen Vitalität und Erhalt des Ansprechverhaltens der Zellen auf die spezifischen Zielschadstoffe oder Hefepheromone. Zusammengefasst konnten mit dem vorgestellten Immobilisierungssystem sehr hohe Überlebensraten der Sensorzellen bei...

A.4.4 - Langasite-based Microbalance for Determination of the Non-stoichiometry in Praseodymium-Cerium Oxide Thin Films at Elevated Temperatures

S. Schröder & H. Fritze
The oxygen partial pressure dependent non-stoichiometry of praseodymium-cerium oxide thin films (Pr0.1Ce0.9O2-δ, PCO) is investigated at temperatures between 700 and 900 °C. The non-stoichiometry of PCO is determined gravimetrically using a high-temperature microbalance consisting of piezoelec-tric langasite (La3Ga5SiO14) resonators. Shifts of the resonance frequency are correlated with mass changes caused by oxygen incorporation/release using the Sauerbrey equation and converted into the oxygen non-stoichiometry of PCO. Chemical and mechanical properties of the PCO films might influence...

A4.2 - Detection of short trace gas pulses

T. Baur, A. Schütze & T. Sauerwald
A novel method for detection of short gas pulses at very low concentrations is presented. The approach is based on a special temperature modulation technique leading to the differential measurement of surface reduction (DSR) of a metal oxide semiconductor (MOS) gas sensor. For this method, the sensor surface is oxidized at high temperature (e.g. 400 °C). An abrupt step in temperature to e.g. 100 °C results in a nonequilibrium state with a strong excess of...

D3.3 - Millimeter Wave Radar Imaging for Non-Destructive Detection of Material Defects

I. Ullmann, J. Adametz, D. Oppelt & M. Vossiek
This contribution presents a novel method for the detection of material defects by means of millimeter wave radar imaging. Unlike common radar signal processing algorithms, which are usually based on the assumption of free space propagation of the electromagnetic wave, our approach also considers the effects occurring at material discontinuities, namely refraction and the change in phase velocity. Therefore, by means of the developed reconstruction algorithm, we are able to correctly depict the inside of...

P3.07 - Impedanzspektroskopie zur Verfolgung der metabolischen Aktivität von Saccharomyces cerevisiae mit interdigitalen Platindickschichtelektroden

J. Posseckardt, C. Schirmer, A. Kick, K. Rebatschek, T. Lamz & M. Mertig
Die Impedanzspektroskopie ermöglicht in situ eine schnelle sowie zerstörungsfreie Charakterisierung lebender Zellen, was beispielsweise für die Referenzierung von Messwerten von Bedeutung ist. Zur Detektion lebender Hefezellen (Saccharomyces cerevisiae) mittels Impedanzspektroskopie wurden hier interdigitale Platindickschichtelektroden verwendet. Dabei wurde die komplexe Impedanz in einem Bereich zwischen 0,01 Hz und 1 MHz sowohl für Elektroden mit lebenden als auch Hitzeinaktivierten Hefezellen, suspendiert in Nährmedium bzw. immobilisiert in Agar über einen Zeitraum von 300 min bestimmt. Für ein besseres...

A1.4 - A New Approach For a Planar Miniaturized PCB Based High Sensitivity Fluxgate Sensor Design

M. Lenzhofer, M. Ortner, G. Schulz & J. Stahr
In many sensor applications, for example proximity switches, current-, torque-, angle- or position sensors, Hall-effect elements are used. Such devices require strong magnetic fields in the order of millitesla to generate a valid output signal. In that context Fluxgate sensors are a better choice as they can detect much weaker fields, but are limited by current technology to large and heavy sensor heads and show high power consumption. State of the art Fluxgate sensors are...

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  • 2017
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