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Smart systems Integration Conference 2011, SSI 2011

作者： Sowade, Enrico Dinh, Trong Nghia Arreba, Andrea Seifert, Tobias Blaudeck, Thomas Kanoun, Olfa Baumann, Reinhard R. Chemnitz University of Technology Digital Printing and Imaging Technology Chemnitz Germany Chemnitz University of Technology Measurement and Sensor Technology Chemnitz Germany Universitat Politècnica de Catalunya Escola Politècnica Superior de Castelldefels Barcelona Spain Fraunhofer Institute for Electronic Nano Systems Printed Functionalities Chemnitz Germany

The deposition of SDS-stabilized MWCNTs dispersed in water using piezo inkjet printing was demonstrated. It turned out that inkjet printing is a fast and versatile tool for the production of CNT-based thin films applicable e.g. for sensor structures. One of the main challenges is the ink composition. The amount and the physical dimensions of MWCNTs dispersed in the ink are crucial for the printing process. A low amount and small physical dimensions of CNTs encourage the printing but necessitate several layers to obtain a conductive network. An unfavourable ratio of concentration respectively physical dimensions of MWCNTs and nozzle diameter leads to clogging of the printhead. It was shown, that it is possible to control the film morphology by heating the substrate. Elevation of temperature induced a reduction of evaporation time. The non-uniform thin films exhibit poor conductivity. In contrast the films which were printed on heated substrates possessed a nearly 15 times higher conductivity suitable for various sensor structures. © SSI 2011 - Smart systems Integration Conference. All rights reserved.

关键词： Thin films

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Performance of liquid-deposited multiwalled carbon nanotube films under strain

Performance of liquid-deposited multiwalled carbon nanotube ...

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Smart systems Integration Conference 2011, SSI 2011

作者： Dinh, Trong Nghia Sowade, Enrico Arreba, Andrea Belau, René Blaudeck, Thomas Baumann, Reinhard R. Kanoun, Olfa Chemnitz University of Technology Measurement and Sensor Technology Chemnitz Germany Chemnitz University of Technology Digital Printing and Imaging Technology Chemnitz Germany Fraunhofer Research Institute for Electronic Nano Systems Printed Functionalities Chemnitz Germany Universitat Politècnica de Catalunya Escola Politècnica Superior de Castelldefels Barcelona Spain

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Magnetic field inhomogeneity induced on the magneto-optical current sensors

Magnetic field inhomogeneity induced on the magneto-optical ...

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ICO International Conference on Information Photonics

作者： El-Khozondar, Hala J. Muller, Mathias S. El-Khozondar, Rifa J. Koch, Alexander W. Electrical Engineering Department Islamic University of Gaza P.O. Box 108 Gaza Palestinian Territory Israel Institute for Measurement Systems and Sensor Technology Technical University Munich Germany Physics Department Al-Aqsa University Gaza Palestinian Territory Israel

ISBN: (纸本)9781612843155

The growth in the capacity of electric power system creates a necessity demand on protection relaying systems. Optical current transducers (OCT) which are mainly single mode optical fiber subjected to Faraday rotation are used as replacement for EM transducers for their immunity to the EM interference. However, the sensitivity to currents depends on the Verdet constant which is low in optical fiber but the optical path length can be increased to compensate for it by winding the fiber around a current carrying element a large number of turns. In this work, we would like to study the effect of the inhomogeneity of the magnetic field induced by the current in the sensitivity of the optical fiber sensor. © 2011 IEEE.

关键词： Optical fibers

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Impact of sensor design on the contactless inspection of planar electronic devices by capacitive coupling

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Procedia Engineering 2011年 25卷 415-418页

作者： M. Koerdel F. Alatas A. Schick S.J. Rupitsch R. Lerch Corporate Technology CT T DE HW2 Siemens AG Munich Germany Chair of Sensor Technology Friedrich-Alexander-University Erlangen-Nuremberg Germany Institute of Measurement Systems and Sensor Technology Technische Universität München Germany

The impact of sensor design on the inspection of planar electronic devices by capacitive coupling is investigated. To allow for the inspection of electrically isolated conductive parts of devices, such as partly processed flat panel displays or printed electronic circuits, new sensor designs have been developed and are evaluated with the help of finite element simulations. The analysis of the simulation results shows that a clear detection of the conductive parts is achieved if the sensor geometry enforces a non-uniform electrical field distribution in the range of the sensor area. By studying the capacitive coupling to the individual parts of the sensors, design rules for sensor electrode and shielding geometry are deduced.

关键词： capacitive coupling contactless inspection finite element (FE) simulation flat panel display (FPD) planar electronic device sensor design

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Magnetic field inhomogeneity induced on the magneto-optical current sensors

Magnetic field inhomogeneity induced on the magneto-optical ...

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ICO International Conference on Information Photonics (IP)

作者： Hala J. El-Khozondar Mathias S. Müller Rifa J. El-Khozondar Alexander W. Koch Electrical Engineering Department Palestinian Territory Islamic University of Gaza Gaza UAE Institute for Measurement Systems and Sensor Technology Technical University Munich Germany Physics Department Palestinian Territory Al-Aqsa University Gaza UAE

关键词： Optical polarization Optical fiber sensors Solenoids Optical fibers

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Position estimation using artificial generated magnetic fields

Position estimation using artificial generated magnetic fiel...

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International Conference on Indoor Positioning and Indoor Navigation (IPIN)

作者： Jörg Blankenbach Abdelmoumen Norrdine Geodetic Institute Department of Geodetic Measurement Systems and Sensor Technology Technische Universität Darmstadt Darmstadt Germany

A positioning system is introduced which overcomes the limitations of existing indoor positioning systems by the use of artificial quasi static magnetic fields. The proposed DC magnetic signals show no special multipath effects and have excellent characteristics for penetrating various obstacles. In this contribution the theory of coil-based magnetic fields as well as the basic function principle of the positioning system are described. Furthermore, a prototype that is currently under development is presented.

关键词： Magnetic fields Coils Magnetic field measurement Mathematical model Accuracy Equations Magnetic sensors

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Modelling the capacitive coupling of sensors applied to the contactless inspection of planar electronics

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Procedia Engineering 2010年 5卷 400-403页

作者： M. Koerdel F. Alatas A. Schick S.J. Rupitsch R. Lerch Corporate Technology CT T DE HW2 Siemens AG Munich Germany Department of of Sensor Technology Friedrich-Alexander-University Erlangen-Nuremberg Germany Institute of Measurement Systems and Sensor Technology Technische Universität München Germany

A model aimed to describe the capacitance between probe electrodes and the conductive parts of planar electronic devices is presented. The probe electrodes are the constitutive part of a sensor chip used in an inspection system which is exclusively based on capacitive coupling and employed for the inspection of devices such as flat panel displays and printed electronic circuits. Finite element (FE) simulations of the sensor signal are used to determine the model parameters and to verify the obtained results. The capacitive coupling for arbitrary configurations of parallel arranged conductor tracks and various distances between the tracks and the sensor chip is reproduced by the model. Absolute values of the capacitance with deviations below 5% can be obtained.

关键词： Flat panel display (FPD) Planar electronic device Contactless inspection system Capacitive coupling Finite element (FE) simulation Nonmatching grids

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Configuration of a sparse network of LIDAR sensors to identify security-relevant behavior of people

Configuration of a sparse network of LIDAR sensors to identi...

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Unmanned/Unattended sensors and sensor Networks VI Conference

作者： Wenzl, Konrad Ruser, Heinrich Kargel, Christian Bundeswehr University Munich Institute for Measurement and Automation Division of Sensor Technology and Measurement Systems 85577 Neubiberg/Munich Germany

ISBN: (纸本)9780819477866

Surveillance is an important application of sensor networks. In this paper it is demonstrated how a sparse network of stationary infrared (IR) sensors with highly directional, stationary beam patterns based on the LIDAR principle can be used to reliably track persons. Due to the small number of sensors and their narrow beam patterns a significant portion of the area to be surveilled is not directly assessed by the sensors. To nonetheless achieve reliable tracking of moving targets in the entire area to be monitored, we employ the most appropriate sensor network configuration and propose a probabilistic tracking approach. The behavior of a person moving through the area of observation is classified as "normal" or "abnormal" depending upon the trajectory and motion dynamics. The classification is based on a linear Kalman prediction. © 2009 Copyright SPIE - The International Society for Optical Engineering.

关键词： Optical radar

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Detection and tracking of humans with a sparse network of LIDAR sensors

Detection and tracking of humans with a sparse network of LI...

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Intelligent Sensing, Situation Management, Impact Assessment, and Cyber-Sensing

作者： Ruser, Heinrich Wenzl, Konrad Kargel, Christian Bundeswehr University Munich Institute for Measurement and Automation Division of Sensor Technology and Measurement Systems 85577 Neubiberg/Munich Germany

ISBN: (纸本)9780819476180

The applicability of a sparse sensor network with only two sensor nodes and a small number of directional LIDAR sensors to detect and track humans in an area of surveillance is investigated. The detection and tracking performances are evaluated for various positions of the two nodes as a function of the number of sensors per node and the sensor beamwidths. A quality factor incorporating the area coverage ratio and the position error is introduced to find the best network configuration with a minimal number of sensors yielding a position accuracy sufficient for the task at hand. Extensive simulations and measurements with two laserscanners to emulate the LIDAR sensors were carried out for straight trajectories uniformly distributed over the area of surveillance. In order to improve the tracking performance, we used a Kalman filter based approach. As in our application a spatial mean RMS position error of approx. 0.6 m is sufficient, each of the two sensor nodes must be equipped with 4 LIDAR sensors with a -3dB-beamwidth of 12. ©2009 SPIE.

关键词： Optical radar

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Performance analysis of interrogators for Fiber Bragg Grating sensors based on arrayed waveguide gratings

Performance analysis of interrogators for Fiber Bragg Gratin...

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Optical measurement systems for Industrial Inspection VI

作者： Buck, Thorbjorn C. Muller, Mathias S. Plattner, Markus Koch, Alexander W. Technische Universitaet Muenchen Institute for Measurement Systems and Sensor Technology Theresienstr. 90 80333 Munich Germany

ISBN: (纸本)9780819476722

Fiber Bragg grating (FBG) sensors have proven to be adaptable for monitoring various physical quantitites like temperature, strain, or even vibrations and acoustic noise. Several interrogation methods, like spectroscopic evaluation, interferometric interrogation, active scanning or active filtering systems or passive filtering systems are capable of monitoring the wavelengths of the FBG sensors. Among the passive filtering systems, interrogators based on arrayed waveguide gratings (AWG) have shown to be promising candidates for sensing with FBGs, especially for high-frequency measurement tasks. Whereas the resolution- and the accuracy-dependency on light intensity of direct wavelength determining systems like spectrometers or scanning filter systems can be minimized by data processing algorithms, the performance of passive filtering based interrogators is more sensitive regarding uncertainties induced by electrical amplifier noise, FBG peak shape, light source intensity, etc.. The influence of different sources of uncertainties for AWGbased interrogators on the accuracy of the wavelength determination are investigated by an analytical model. The model is evaluated by a numerical simulation. It is shown how strongly the accuracy and the resolution of such an interrogator depend on the mentioned sources of uncertainties. Considering the obtained results, one can say that FBG interrogators based on arrayed waveguide gratings have, including the shown restrictions, the potential for rugged, compact and cost effective high accuracy wavelength interrogators. © 2009 SPIE.

关键词： Fiber Bragg gratings

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