275 Works

B2.3 - From Basic Flow Property to MEMS Multiparameter Sensors

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Thermal sensors rely on a simple transduction principle. They exhibit the advantage of having a simple and easy-to-manufacture structure requiring no moving parts, which makes them robust, costeffective, and versatile. Consequently, they are widely used in many applications. This paper demonstrates how basic calorimetric flow and thermal parameter sensors, both based on silicon thinfilm technology, can be extended to more sophisticated devices by modifying the sensor layout or by altering the measurement method. In the...

P7.2 - NIR spectroscopy based method for charactisation of biological tissue

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We present a Near Infrared Spectroscopy (NIRS) based method for characterisation of biological tissue under mechanical load. In this study we measured NIR spectra of equine cartilage bone samples with simultaneous application of mechanical load. Our goal is to gain more information about the functional behaviour of cartilage tissue to support cartilage therapy.

B3.4 - Practical Tunneling Magnetoresistive Z-Axis Sensors

A practical tunneling magnetoresistive magnetic field sensor for detecting the magnetic field component perpendicular to the plane of the sensor substrate (Z-axis) is described. The sensor consists of MgO-based MTJs (magnetic tunnel junctions) interconnected as a full-bridge and combined with an array of on-chip flux concentrators. The flux concentrator array is designed to steer the flux from the vertical direction into the in-plane direction parallel to the surface of the substrate enabling the MTJ full-bridge...

B5.4 - First Investigation of LTCC package for high temperature SAW sensors

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SAW temperature sensor devices have been developed for operating temperatures up to and above 1000°C. A challenging task to make these devices available on the market is to develop an appropriate housing concept. A concept based on low temperature cofired ceramics (LTCC) has been investigated and tested under elevated temperatures up to 600°C. The devices showed promising results up to 500°C.

P7.10 - Ermittlung spezifischer Materialkennwerte von Schichten mittels Interdigital-Elektroden

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Eine einfache aber genaue Ermittlung von spezifischen Materialkennwerten ist nicht nur für die Materialforschung, sondern auch in der späteren Anwendung von großem Interesse. Gerade Interdigital-Elektroden ermöglichen ein besonders einfaches Aufbringen der Beschichtung, da keine Deckelelektrode benötigt wird, erschweren aber im Gegenzug die Bestimmung von elektrischen Materialkennwerten durch einen komplexen, zunächst unbekannten Verlauf der Feldlinien. In dieser Arbeit wird deshalb ein einfach anzuwendender und nur von der Dicke der Schicht abhängiger Korrekturfaktor Fgeo vorgestellt, welcher durch...

P7.3 - A readout platform for spectral sensors

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We present a card-size, photocurrent-based readout platform for spectral sensors based on a wavelength sensitive photodiode. The resolving capacity for wavelength shift and ratiometric measurements is examined using different LEDs. With the introduced setup a wavelength shift resolution of 0.1 nm and a limit of detection of 0.001 for the ratiometric measurement was achieved. On the basis of the obtained results, we discuss several advantages and drawbacks of this interrogation approach for spectral sensors.

01 - COST Action TD1105: European Network on New Sensing Technologies for Air-Pollution Control and Environmental Sustainability - EuNetAir

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 international networking has involved more than 120 teams from academia, research, agencies and industry from 31 COST Countries and 7 Non-COST Countries (June 2015).

E7.2 - Temperature Modulated Thermoelectric Gas Sensors

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The output of a thermoelectric gas sensor is a voltage signal that is proportional to the exothermicity, generated during oxidation of reducing gases on a catalyst. A temperature difference between the catalytically active (due to a catalyst film) and an inert part of the device is measured by screen-printed thermopiles. When the absolute sensor temperature is modulated, the resulting signals depend on the catalyst’s conversion behavior and are a characteristic for certain gas species. It...

E7.4 - Real-time Composition Determination of Gas Mixtures

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We have designed and implemented an analytical calculation model with which we can real-time determine the composition of gas mixtures. The model is based upon a multi-parameter flow measurement system, consisting of a Coriolis and thermal flow sensor, a density meter and a pressure sensor. The system enables direct measurement of flow rate and physical properties of gas mixtures, including density, viscosity and heat capacity. We demonstrated real-time composition determination of binary and ternary gas...

D1.2 - Hybrid Optical Sensor for Extreme Temperature Measurement in Next Generation Higher Efficiency Greener Power Plants

Highlighted is a novel hybrid optical design physical sensor technology for extreme environments temperature measurement that combines freespace (wireless) and fiber-optics (wired), single crystal and sintered Silicon Carbide (SiC) materials, and Black-Body radiation thermometry (pyrometry) with laser interferometry to provide robust extreme temperature measurement within a gas turbine. A first generation temperature sensor has been tested in an industrial rig. The temperature probe has survived extreme temperature reaching 1600 ºC and one month of rig...

P4.3 - 6D magnetic field distribution measurements of permanent magnets with magnetic field camera scanner

We present state-of-the-art high resolution 3D magnetic field mapping on permanent magnets of the (Bx, By, Bz) magnetic field vector components in 3D space, resulting in measurement data with 6 degrees of freedom. These measurements are performed using a high speed 3D magnetic field camera, featuring an integrated 2D Hall sensor array, mounted on a 3-axis mechanical scan stage with a scan range of 300 x 300 x 300mm³ with which measurement speeds of 120mm²/s...

P2 - Investigation of InAsSbP Quantum Dot Mid-Infrared Sensors

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This work presents the results of investigation of low bias mid-IR photoconductive cell (PCC) with quantum dots. Self-assembled InAsSbP nanostructures were grown on InAs(100) substrate by modified liquid phase epitaxy. Hysteresis with remnant capacitance of 0.483 pF and contra-directional oscillations on the PCC’s capacitance–voltage characteristic at 78 K were observed. Additionally, peaks at 3.48 μm, 3.68 μm and 3.89 μm on room temperature photoresponse spectrum of quantum dot photoconductive cell were detected. Room temperature photo-sensing...

A4.2 - Measurement of Frequency Dependent Radiation Patterns of Ultrasonic (Wedge) Transducers

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It is well known from theory that a transducer's radiation pattern depends on the aperture and driving frequency. Futhermore, it is widely assumed that the main lobe's orientation does not change with frequency. This work presents a novel measurement method for quickly obtaining the frequency resolved radiation pattern of ultrasonic (wedge) transducers (UT). The setup comprises a water basin, where an UT is mounted on an angle controlled tilting unit. A pulsed excitation is applied...

C2.3 - Surveillance of Drying Processes of Forage Layers in Silos

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rganic particle depositions at the inner side of tower silo walls present health risks for animals and humans, creating a habitat for mycotoxin producing molds. Mold proliferation and mycotoxin production in forage substrates are influenced by abiotic factors such as the water content. Until now, a non-invasive detection method of forage depositions in silos has not been available, making it difficult to remove them accurately timed to prevent of fungal infestation. In the current study...

C3.1 - Acoustic and Electrical Properties of Piezoelectric Materials for High-Temperature Sensing Applications

Sensing applications at temperatures above 500 °C have motivated research on a number of innovative single-crystalline piezoelectric materials that are compositionally and structurally stable at these temperatures. These materials include ordered and disordered crystals in the langasite family, gallium orthophosphate, rare-earth calcium oxyborates, and crystals with the structure of melilite. In this review, measurements and analysis of the properties of these materials relevant to the operation of piezoelectric acoustic sensors at elevated temperatures are summarized,...

E7.1 - Fast ion-selective ppb-level gas sensor based on pulsed atmospheric pressure chemical ionization and ion-ionrecombination

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Investigating the ion-ion-recombination rate of different analytes at atmospheric pressure reveals that ion species can be separated by their ion specific recombination rates. This effect is utilized for the development of a novel gas sensor: A gas mixture is ionized by atmospheric pressure chemical ionization (APCI) for a defined ionization time. At the end of the ionization the generated ion species recombine leading to a decreasing ion density with an increasing recombination time. The measured...

D8.1 - Detecting and Compensating Sensor Faults in a Hydraulic Condition Monitoring System

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In this work, we present a statistical condition monitoring system allowing the qualitative and quantitative determination of typical faults related to the hydraulic system as well as sensor faults of the installed sensor network. Single sensor faults such as constant offset, drift, noise, and signal peaks can be identified before leading to false alarms. Furthermore, the system is able to compensate the failure of up to 5 sensors with sufficient classification performance exploiting inherent correlations...

D8.3 - Evaluation of laser sensors for precise line following applications

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For the development of a line coating robot, that is able to autonomously apply line markings on the ground, the robot needs to follow a line with high precision. To minimize the costs of the system a low cost laser sensor was developed for navigating the system along a laser line. The sensor was then compared to a commercial laser receiver for rotating lasers. The system was tested in an application oriented scenario and tracked...

D3.4 - Multimode Laser Doppler Velocimeter for Flow Measurements in the Manifold of a Fuel Cell Stack

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Fuel cell stack performance strongly depends on the uniformity of the flow distribution over the fuel cells. Typically, numerical flow simulations are used to design the small flow geometries of a stack but experimental validation of the simulated flow is mostly lacking. To measure the flow distribution within these small geometries a specific Laser Doppler Velocimeter has been developed that uses light with low spatial coherence (multimode light) and fluorescent tracer particles. A spatial resolution...

D4.1 - Inkjet and Aerosol Jet® Printed Sensors on 2D and 3D Substrates

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Digital non-contact-printing technologies e.g. inkjet or Aerosol Jet® are becoming more and more interesting for the manufacturing of electronic components due to their benefits such as easy variation of printing layouts, short process chains without masks, large variety of usable substrates and inks - frequently based on nanomaterials - and a certain 3D capability. In this paper printed sensors for e.g. temperature, strain, intrusion, humidity, or magnetic fields fabricated by inkjet or Aerosol Jet® technology...

D5.3 - Laser induced fluorescence spectroscopic sensor for realtime identification of fossil diesel fuel, biodiesel and their blends

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A low cost laser induced fluorescence spectroscopic sensor (LFS-sensor) was designed to identify different fossil diesel fuels, biodiesel and biodiesel/diesel fuel blends. This sensor was built from commercial electronic and optical components. It provides the emission spectrum excited at 405 nm. Currently 52 spectra of different diesel fuels, biodiesels, biodiesel blends and gasoline were measured and stored in a reference data bank. Based on this, unknown fuel samples can be identified easily. Furthermore, the LFS-sensor...

P2.4 - Investigation on strain gauges made from carbon black based ink

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The behavior of printed piezo-resistive strain gauges based on amorphous carbon black are studied when applied to a steel deformation body. Strain gauges made from piezo-resistive materials offer far higher gauge factors compared to metal film strain gauges and thus in theory a higher signal-to-noise-ratio. Amorphous carbon is a promising material offering gauge factors of up to 70 and can be process using inkjet material deposition thanks to the process developed by. Khajeh et. al....

P3.2 - Ultrasonic time reversal for haptic interaction

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The reversibility of an acoustic wave can be used to refocus a signal on a point by time reversal (TR) techniques. Numerous application fields are connected to this technology, such as medical intervention, non-destructive testing or impact localization on touchscreen systems. Latter technology recently gains increasing attention. Normally touchscreens require the users to visually control their interaction. However, if this is not possible, e.g. in cases of individual physical constraints or environmental conditions, the usability...

A6.4 - Characterization of the Polarization State of Embedded Piezoelectric Transducers by Thermal Waves and Thermal Pulses

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In this work, we demonstrate that thermal methods are a promising approach for non-destructive characterization of the polarization state of embedded piezoelectric transducers in integrated sensoractuator modules. The modules are subjected to periodic heating by a square-wave modulated laser beam or to single-pulse heating by a laser pulse. The frequency or time dependence of the resulting pyroelectric current carries information about the pyroelectric coefficient depth profile which correlates directly with the polarization distribution. In frequency...

A2.1 - Ceramic based pressure sensor with highly sensitive thin film

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Nickel containing carbon layers (Ni:a-C:H), deposited under specific conditions in a combined PVD/CVD plasma process show strain sensitivities that are enhanced by a factor of 5 - 15 compared with today's standard sensor thin films. The strain sensitivity (gauge-factors) are about 20, in unpublished developments even about 30. An innovative technological approach for pressure sensors is presented using these Ni:a-C:H layers. Membrane and sensor body are based on the ceramic material ZrO2 stabilized with Y2O3...

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  • 2015
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