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2006 IEEE International Conference on Multisensor Fusion and Integration for Intelligent systems, MFI

作者： Krämer, Sebastian G. M. León, Fernando Puente Appert, Benoît Institute for Measurement Systems and Sensor Technology Distributed Measurement Systems Area Technical University of Munich 80290 Munich Germany

ISBN: (纸本)1424405661

As wind turbines are increasing both in number and in height, they are exposed to a major threat in form of lightning strikes. The protection of these structures from the effects of lightning is an important issue in today's wind turbine development. However, as lightning is random in nature, a complete protection against its damages is not achievable. The presented method for lightning impact localization and classification using a fiber optic current sensor network helps to detect damages caused by lightning and to monitor the blades. The system is connected to the wind turbine control and monitoring system. © 2006 IEEE.

关键词： Wind turbines

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Fiber-optic current sensors for lightning detection in wind turbines

Fiber-optic current sensors for lightning detection in wind ...

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Optical Fiber sensors, OFS 2006

作者： Krämer, Sebastian G.M. León, Fernando Puente Institute for Measurement Systems and Sensor Technology Technical University Munich 80290 Munich Germany

ISBN: (纸本)1557528179

Fiber optic sensors are immune against electromagnetic interference (EMI). Hence a fiber optic current sensor network can be used for lightning detection and classification in insulating materials. The first application includes the monitoring of big structures made of composite materials like wind turbine blades. © 2006 OSA/OFS 2006.

关键词： Wind turbine blades

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Reflection-based surface segmentation using active illumination

Reflection-based surface segmentation using active illuminat...

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IMTC'06 - IEEE Instrumentation and measurement technology Conference

作者： Lindner, C. Puente León, F. Department of Measurement Systems and Sensor Technology Technische Universität München Theresienstr. 90/N5 80333 München Germany

ISBN: (纸本)0780393600

Segmentation plays an important role in image processing. Its goal is to divide an image into disjoint parts by defined rules. We present a method to accomplish an illumination-based segmentation of structured surfaces based on surface properties. To this end, an illumination series-i.e. a series of images taken with directional light from different directions-is recorded. For each location of the surface, a signal is extracted which describes the intensity of the corresponding point depending on the illumination angle. From this signal, features are extracted that enable a pointwise segmentation of the surface. Aided by suitable parametric models, the surface reflectance is described, and the corresponding parameters are estimated from the intensity signal. Moreover, the effect of sampling the illumination space is discussed. On the one hand, it is desirable to keep the number of illumination angles as small as possible. On the other hand, a minimum number of images is needed to achieve a reliable segmentation. The performance of the proposed approach is demonstrated with real images. They prove that the higher data acquisition expense is compensated by a significant increase of both the spatial resolution and the robustness. ©2006 IEEE.

关键词： Image segmentation

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Fiber Optic sensor Network for Lightning Impact Localization and Classification in Wind Turbines

Fiber Optic Sensor Network for Lightning Impact Localization...

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International Conference on Multisensor Fusion and Integration for Intelligent systems (MFI)

作者： Sebastian G. M. Kramer Fernando Puente Leon Benoit Appert Institute for Measurement Systems and Sensor Technology Distributed Measurement Systems Area Technical University Munich Munich Germany

关键词： Optical fiber sensors Lightning Wind turbines Blades Protection Electromagnetic interference sensor systems Intelligent sensors Monitoring Control systems

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Reflection-based Surface Segmentation using Active Illumination

Reflection-based Surface Segmentation using Active Illuminat...

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IEEE Instrumentation and measurement technology Conference

作者： C. Lindner F. Puente Leon Department of Measurement Systems and Sensor Technology Technische Universität München Munchen Germany

Segmentation plays an important role in image processing. Its goal is to divide an image into disjoint parts by defined rules. We present a method to accomplish an illumination-based segmentation of structured surfaces based on surface properties. To this end, an illumination series - i.e. a series of images taken with directional light from different directions - is recorded. For each location of the surface, a signal is extracted which describes the intensity of the corresponding point depending on the illumination angle. From this signal, features are extracted that enable a pointwise segmentation of the surface. Aided by suitable parametric models, the surface reflectance is described, and the corresponding parameters are estimated from the intensity signal. Moreover, the effect of sampling the illumination space is discussed. On the one hand, it is desirable to keep the number of illumination angles as small as possible. On the other hand, a minimum number of images is needed to achieve a reliable segmentation. The performance of the proposed approach is demonstrated with real images. They prove that the higher data acquisition expense is compensated by a significant increase of both the spatial resolution and the robustness

关键词： Lighting Image segmentation Image processing Feature extraction Parametric statistics Reflectivity Parameter estimation Image sampling Data acquisition Spatial resolution

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Magnetic nanostructure hysteresis loop calculation for modified thin film multi-layer by ion irradiation

Magnetic nanostructure hysteresis loop calculation for modif...

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28th International Spring Seminar on Electronics technology: Meeting the Challenges of Electronics technology Progress, 2005

作者： Bajalan, D. Hauser, H. Fulmek, P.L. Institute of Sensor and Actuator Systems Vienna University of Technology Gusshausstrasse 25-29/366 A-1040 Vienna Austria Christian Doppler Laboratory for Automotive Measurement Research Gusshausstrasse 25-29/366 A-1040 Vienna Austria

ISBN: (纸本)0780393244

The fluence of ion irradiation on paramagnetic, polycrystalline thin films affects both, anisotropy and spontaneous magnetization Ms. The dependence of coercivity and initial susceptibility on Ms is predicted by a hysteresis model considering the balance of energy with good qualitative agreement. The calculated bit stability, determined by the anisotropy constant, may be promising for future data storage applications. © 2005 IEEE.

关键词： Nanostructured materials

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Friction modelling of a linear high-precision actuator

Friction modelling of a linear high-precision actuator

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作者： Zimmermann, J. Sawodny, O. Hausotte, T. Jäger, G. Institute for Automation and Systems Engineering Technische Universität Ilmenau P.O. Box 100 565 D-98684 Ilmenau Germany Institute of Process Measurement and Sensor Technology Technische Universität Ilmenau P.O. Box 100 565 D-98684 Ilmenau Germany

ISBN: (纸本)008045108X

For control applications aiming accurate positioning and path tracking friction modelling and compensation can be very important, especially when working with small displacements as usual in nano technologies. The paper at hand describes friction identification and friction model application for a linear high-precision ball bearing guide driven by a voice coil actuator and using high-resolution position measurement equipment. After noting some friction models the characteristics of friction on nanometer scale are investigated with several experiments. At last some remarks on control design are given. Copyright © 2005 IFAC.

关键词： Ball bearings

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FRICTION MODELLING OF A LINEAR HIGH-PRECISION ACTUATOR

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IFAC Proceedings Volumes 2005年第1期38卷 133-138页

作者： J. Zimmermann O. Sawodny T. Hausotte G. Jäger Technische Universität Ilmenau Institute for Automation and Systems Engineering P.O. Box 100 565 D-98684 Ilmenau Germany Technische Universität Ilmenau Institute of Process Measurement and Sensor Technology P.O. Box 100 565 D-98684 Ilmenau Germany

关键词： friction models friction identification high resolution measuring

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Pixel shader based real-time image processing for surface metrology

Pixel shader based real-time image processing for surface me...

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IEEE Instrumentation and measurement technology Conference

作者： A. Purde A. Meixner H. Schweizer T. Zeh A. Koch Institute for Measurement Systems and Sensor Technology Technische Universität München Germany

Optical systems for surface contour and deformation measurement in quality assurance require short measurement times. Standard CCD or CMOS cameras with high resolution can provide up to 20 frames per second or more. In the area of surface metrology, the major time consuming bottleneck is the step of signal processing. This bottleneck can be significantly reduced by executing the image processing algorithms in a standard PC graphic hardware - up to now mainly used for computer games. This paper shows how, and up to which degree, image processing algorithms are transferable to graphic hardware and the considerable benefits of this new technique. The described methods and results are also transferable to other measurement technologies requiring high speed image processing.

关键词： Pixel Image processing Metrology Signal processing algorithms Optical signal processing Computer graphics Hardware High speed optical techniques Quality assurance Charge coupled devices

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A tuning transformer for the automatic adjustment of resonant loop antennas in RFID systems

A tuning transformer for the automatic adjustment of resonan...

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IEEE International Conference on Industrial technology (ICIT)

作者： G. Steiner H. Zangl P. Fulmek G. Brasseur Christian Doppler Laboratory for Automotive Measurement Research Graz University of Technology Austria Institute of Sensor and Actuator Systems Vienna University of Technology Austria

Radio frequency identification (RFID) systems allow contactless communication between a small portable tag and a reader device. In this paper, we address the problem of performance degradations due to the detuning of resonant reader antennas in the widely used 13.56 MHz frequency band. A novel design of a tuning transformer for the adjustment of the center frequency of resonant loop antennas is proposed. The ferrite core of the transformer is premagnetized using an additional DC winding. The HF and DC windings are decoupled by an iron core. Besides the tuning, the transformer may also be used for impedance matching and for balancing an unbalanced signal. The function of the device was proven by network measurements. Key Words: Loop antenna, resonance tuning, RFID, tunable inductance.

关键词： Resonance Radiofrequency identification Tuning Transformer cores Degradation Frequency locked loops Resonant frequency Ferrites Iron Impedance matching

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