2,770 Works

P2AR.12 - Surface Tuning on Metal Organic Frameworks for Film Bulk Acoustic Resonator Sensors Array

X. Yan, H. Qu, W. Pang, H. Zhang & X. Duan
In this paper, an in-situ fabrication method of coating metal organic framework (MOF) on film bulk acoustic resonator (FBAR) was described. This method is mild and straightforward, able to produce dense and homogeneous sorptive layers on FBAR. The surface of MOF layer on FBAR was further modified with several types of self-assembled monolayers (SAMs). The introduction of SAMs on MOF can vary the response of FBAR sensors toward volatile organic compounds (VOCs). The prepared 4...

P1NM.20 - Isoprene detection with Ti-doped ZnO nanoparticles

D. Klein Cerrejon, A. T. Güntner, N. J. Pineau, D. Chie, F. Krumeich & S. E. Pratsinis
Exhaled isoprene could enable non-invasive real-time monitoring of cholesterol-lowering therapies. Here, we report an isoprene-selective sensor at high relative humidity (RH). It is made of nanostructured, chemo-resistive Ti-doped ZnO nanoparticles produced by flame spray pyrolysis (FSP) and directly deposited onto sensor substrates forming highly porous films. The constituent particles consist of stable Ti-doped ZnO solid solutions for Ti levels up to 10 mol%. Ti doping strongly enhance the isoprene sensitivity (>15 times higher than pure...

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...

2. Plenarvortrag: Mess- und Sensortechnik in der digitalen Transformation

U. Kaiser & K.-D. Sommer
Die digitale Transformation ist über einige Ihrer Handlungsfelder unmittelbar mit der Mess- und Sensortechnik verbunden. Dafür müssen Sensoren „smart“ sein und können so Teilnehmer eines IoTÖkosystems werden. „Smarte“ Sensoren unterstützen Diagnose und vorausschauende Wartung und können Ihren eigenen Kalibrierungsbedarf optimieren. Die IoT-Ökosysteme sind eine gute Plattform für die Fusion vieler diverser Sensoren zu Soft-Sensoren mit neuen Messgrössen. Hierfür bietet die recht neue Methodik des maschinellen Lernens neue Möglichkeiten. Der Schutz von Informationen ist bei „smarten“...

C2.1 - Ultrasound imaging through multimode waveguides using time reversal virtual array method

M. Kalibatas, R. Nauber, D. Dawidowski, L. Büttner & J. Czarske
In industrial processes, such as crystal growth of photovoltaic silicon or continuous steel casting, the quality of the end-products strongly depends on the melt flow. Therefore, in situ flow imaging of opaque melts under harsh conditions is important. However, ultrasound transducer arrays usually can not be operated at temperatures beyond 100 C. An approach is to a use multimode waveguide, to spatially seperate the sensor from the measurement fluid. To overcome the complex ultrasound propagation...

B4.3 - Investigations of the electrical contacting of new piezoresistive polymer-ceramics

L. Tang, F. Roth, T. Rossner, J. Lotichius, J. Hielscher, N. Nicoloso & R. Werthschützky
Silicon oxycarbide nanocomposite with segregated carbon (C/SiOC) belongs to the group of polymer derived ceramics (PDCs). The C/SiOC shows piezoresistive properties by mechanical load. As an advantage over metal foil strain gauges and doped sensing resistors, the C/SiOC material is expected to have a high gauge-factor (k-factor) even for high temperature applications. In order to characterize the piezoresistive properties of the C/SiOC material, force-impedance characteristic must be acequired. The paper will show different layouts of...

1.1.2 Thermisches Verhalten von piezoresistiven Drucksensoren – Charakterisierung

G. Brokmann, H Übensee & G. Gerlach
An Drucksensoren aus einkristallinem Silizium auf der Basis anisotrop nasschemisch geätzter Biegeplatten und diffundierter piezoresistiver Widerstände wurden Untersuchungen zum thermischen Verhalten nach dem Einschalten durchgeführt. Es wurden mit elektrischen Messungen des Einlaufverhaltens und der Lock-in-Thermographie zwei unabhängige Messverfahren zur Charakterisierung des transienten Verhaltens mit einer FE-Modellierung verwendet, die Messergebnisse verglichen und anschließend die RC-Parameter eines SPICE-Modells angefittet. Dieses Teilmodell kann in ein umfassendes Verhaltensmodell für piezoresistive Siliziumdrucksensoren integriert werden.

D7.3 - Autonomous Tuning Methods for Piezoelectric Energy Harvesting Generators

L. Mateu, J. Knauer, P. Spies & H. Zessin
This paper explores two different methodologies that are able to change the resonance frequency of a piezoelectric cantilever. In real-life energy harvesting applications like logistics, condition or structural health monitoring, the ambient frequency is changing. A drawback of harvesting energy from ambient vibrations is the fact that the frequency of the ambient vibration and the resonance frequency of the piezoelectric generator should match. Therefore, in order to sufficiently and continuously harvest energy from ambient vibrations,...

P2AR.1 - Development of Multichannel Interdigitated Capacitor Based Sourness Sensor

R. Rahaman Khan, H.-M. Jeong, S.-W. Kim, J.-B. Kwon & S.-W. Kang
In our study, we designed and developed a multichannel interdigitated capacitor (IDC) based sourness sensor, that is based on the principle of capacitance variation. Four different types of solvatochromic dyes namely, Nile-red, Reinchardt-dye, (R-dye), auramine-O, and rhodamine-B were individually mixed with polyvinylchloride (PVC) polymer and dimethylacetamide (DMAC) solution to make four different types of sourness sensitive sensing solutions. Thoes solutions were individually inserted into four interdigitated electrodes by a spin coater and dry at the...

7.5.2 PDA-based Multifunctional Microfluidic Sensor System

Radislav A. Potyrailo, Andrew Leach & William G. Morris
We demonstrate a personal data assistant (PDA)-based analytical platform that provides detection, fluid manipulation, computing, and communication capabilities for multi-functional chemical analysis. This multifunctionality is provided by integrating the PDA with a microfluidic system, solid sensing films, and a micro-pump operated by PDA. The applicability of our approach for chemical detection in water and air was illustrated using a built integrated circuit board with eight surface mounted light source-detector opto-pairs with peak emission at 560...

P1.5 Kostengünstige Nass/Nass-Differenzdruckmessung

R. Werner & H. Schöpe
In dieser Veröffentlichung präsentieren wir ein Konzept für einen kostengünstigen, miniaturisierten Sensor zur Messung von Druckdifferenzen unter rauen / nassen Umgebungsbedingungen. Auf die in solchen Fällen oft eingesetzte Trennmembran mit Ölvorlage, die das Messelement vom jeweiligen Medium isoliert, wird hier verzichtet. Stattdessen werden zur Differenzdruckmessung zwei Siliziummesselemente eingesetzt und die Differenzdruckmessung durch zwei Druckmessungen mit relativem Bezug und anschließender Differenzbildung ersetzt. Konstruktionsbedingt kommen die sensiblen Messelemente nur mit ihrer unempfindlichen Rückseite mit dem jeweiligen Messmedium...

P1.5.3 Gas Sensing Characteristics of Low-powered Dual MOSFET Hydrogen Sensors

Bum-Joon Kim, Jin-Ho Yoon & Jung-Sik Kim
A low-powered hydrogen sensitive dual-MOSFET device was designed, fabricated and characterized for self compensation to electric signal degradation. Differential outputs in both sensitive and reference FETs were stable for changes in the outer environments due to the same dependence of the electrical characteristics. The proposed sensor design showed low power consumption (45.5 mW at 150°C) by achieving complete heat isolation. Stable responses to H2 gas were observed over a range of temperatures and the optimal...

O3.4 - Optical Incremental Rotary Encoder in Low Cost Design

D. Hopp, C. Pruss, W. Osten, J. Seybold, V. Mayer & H. Kueck
Rotary encoders are used for angular measurements in numerous applications like rotating machin parts, electrical motors or for example to detect the steering angle in cars. There are differed encoding principles available such as potentiometric, capacitive, inductive or optical, with the optic systems reaching the highest angular accuracy. As a disadvantage the resolution enhancement of optic encoder systems is associated with increasing cost. Considering the need for competitive sensors, we have developed a new concept...

P1GS.17 - WO3 Nanowires Decorated with Nickel Oxide Nanoparticles for H2S Detection

E. Llobet, E. Navarrete, C. Bittencourt & P. Umek
Single-step or two-step aerosol assisted chemical vapor deposition methods have been used to grow single crystalline tungsten oxide nanowires loaded with different concentrations of nickel oxide nanoparticles. Working temperatures and nickel loadings were studied and optimized to achieve the optimal working conditions for detecting hydrogen sulfide. Morphology, crystalline structure, composition, sensing properties and mechanisms will be presented and discussed in detail. The twostep method allows for controlling Ni loading in a wide range while keeping...

C7.1 - Energy Efficient Wireless Networking of Sensor Nodes

I. Demirkol, J. Paradells, J. Oller, J. Casademont, A. Calveras & M. Catalan
Wireless sensor networks have paved the way to a new era in user applications, where information can be sensed, processed, and distributed from remote environments with minimal or no human interaction. As the sensor nodes in these networks are often battery-operated and communicate wirelessly, they are constrained by limited resources such as bandwidth, processing speed and especially by energy. Therefore, depending on the user application, different challenges are encountered for the realization of wireless sensor...

4.4.1 Overview of the COST Action TD1105 EuNetAir

Michele Penza
This is a short overview of the COST Action TD1105 EuNetAir -European Network on New Sensing Technologies for Air-Pollution Control and Environmental Sustainability -funded in the framework European Cooperation in the field of Scientific and Technical Research (COST) during the period 2012-2016. The main objective e of the Concerted Action is to develop new sensing technologies for Air Quality Control at integrated and multidisciplinary scale by coordinated research on nanomaterials, sensor-systems, air-quality modelling and standardised...

6.2.2 Flexible sensors for an indoor air quality sensor system

Hanns-Erik Endres, Robert Faul, Waltraud Hell, Karlheiz Bock, Klaus Rose & Katja Scherbaul
Indoor air quality monitoring and control at home and in cars are essential for energy saving, especially for highly sealed passive buildings and electrical driven cars. The demand driven ventilation assures the optimum compromise between a good air-quality and energy saving. This paper describes a sensor system measuring temperature, relative humidity and CO2 concentration based on resistive and impedimetric sensors. A first system on polymer foil with Au-thin film resistors and interdigital capacitors (rh, CO2)...

P2.9.2 Small and Simple Devices for Increase Mixing on Detector Surfaces

Leonardo F. Hernandez, Alexandre A. Jesus, Roberto R. Lima, Maria Lúcia P. Silva & Estevão R. Fachini
Due to transport phenomena, analyte adsorption on the detector surface can be hindered, which increases the detection limit. Therefore, this work aims the simulation, production and tests of a simple miniaturized structure that favors mixing on detector surfaces. The conception of the manufactured device is based on passive mixers. Mixing is improved by changing the surfaces properties of plasma deposited thin films. Hexamethyldisilazane (HMDS) and nonafluoro(iso)butyl ether (HFE) and co-deposited HMDS/HFE plasma films were modified...

P5.4 - Development of a Spectral Camera for Cartilage Monitoring

A. Kuehn, A. Graf, U. Wenzel, S. Princz, R. Miller, H. Mantz & M. Hessling
In a joint research project with the Ulm University Medical Center, the Ulm University of Applied Sciences is developing a bioreactor for tissue engineering of facial cartilage. The cartilage growth will be monitored by a spectral camera to obtain cartilage composition and thereby to ensure cartilage quality. By excitation the cartilage with UV light, it is possible to record low intensity fluorescence spectra in the spectral range from 380 to 500 nm over the surface...

I3.1 - Design, Operation and Performance of a Fabry-Perot-Based MWIR Microspectrometer

Martin Ebermann, Norbert Neumann, Karla Hiller & Steffen Kurth
In this paper we present basic designs, operation concepts and some application examples of a novel microspectrometer for the spectral range of 3-5μm, which is based on a pyroelectric detector with an integrated micromachined Fabry-Perot filter (FPF). We discuss the influence of different optical setups on the spectral resolution and the signal-to-noise ratio of the microspectrometer. Two basic operation modes, step-scan mode and continuous-sweep mode are demonstrated. Such a device has a large potential in...

D2.3 - Unambiguous Wide-Range Optical Voltage Sensor with Dual Operating Wavelengths

X. Gu, S. V. Marchese & K. Bohnert
We extend the unambiguous measurement range of an electro-optic voltage sensor from 75 kV to 100s of kilovolts (spanning multiple 2π phase shift ranges), by combining phase shift principal value measurements at two different wavelengths. Compared with previous two-wavelength techniques, this new approach completely eliminates all remaining measurement ambiguities.

4.2.4 Schwingungsverhalten von Langasit-Resonatoren bei unterschiedlicher Elektrodenleitfähigkeit

S. Schmidtchen, D. Richter & H. Fritze
Piezoelektrische Resonatoren, die mit einer Metalloxidschicht versehen sind, können als Gassensoren genutzt werden, indem der Einfluss der elektrischen und mechanischen Eigenschaften dieser Schicht auf das Schwingungsverhalten betrachtet wird. Dabei können sowohl die Verschiebung der Resonanzfrequenz durch eine Änderung der Schichtmasse als auch die Veränderung von Amplitude bzw. Profil der Schwingung zur Messung herangezogen werden. Genutzt werden zwei verschiedene Elektrodengeometrien, die zum Mikrowaagemodus bzw. zum Leitfähigkeitsmodus führen. Mit Resonatoren, die im Leitfähigkeitsmodus betrieben werden, können Aussagen...

D7.4 - MEMS-based Measurement of Rheological Fluid Properties

I. Dufour, E. Lemaire & B. Caillard
Silicon microcantilevers can be used to measure the rheological properties of complex fluids. In the method presented in this paper, the measurement of the microcantilever’s dynamic spectrum is used to extract the hydrodynamic force exerted by the surrounding fluid on the microcantilever and consequently the rheological fluid properties. The originality of the proposed method relies in the fact that not only may the viscosity of the fluid be measured but also the fluid’s viscoelasticity, i.e.,...

B6.4 - Optical Measurement of the Thickness of an Individual Layer in a Plastic Multilayer Compound

W. Weber, D. Plohmann, M. Huber & H. Steigerwald
In plastic multilayer compounds the functionality of the system is often provided by a single functional layer. The materials used for these functional layers often are comparatively expensive, which makes it desirable to have these layers as thin as possible. The pipe extrusion method is the standard manufacturing technique for production of multilayer plastic pipes. To be safe, the functional layer is deposited with significantly higher thickness than actually required. This procedure causes a significantly...

4.2 - High-dynamic Infrared Cameras for Non-contact Temperature Measurement from 300 °C to 3000 °C

U. Hoffmann, C. Schiewe, D. Wassilew, R. Teichmann & G. Hofmann
State of the art IR cameras in the near infrared spectral range for monitoring high temperatures in industrial applications are characterized by a number of small measurement ranges. Scenes with a high temperature contrast require several measures switching between these ranges and result in pictures with under- respectively overexposed parts. New developed high temperature IR cameras with high-dynamic Silicon detectors are using a spectral range in the near infrared and a very special signal processing....

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