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arXiv 2024年

作者： Wang, Kun Zhu, Changyan Colicchia, Ennio Dong, Xingchen Kurz, Wolfgang Mizuno, Yosuke Jakobi, Martin Koch, Alexander W. Chong, Yidong Technical University of Munich School of Computation Information and Technology Institute for Measurement Systems and Sensor Technology Theresienstrasse 90 Munich80333 Germany Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore637371 Singapore Faculty of Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama240-8501 Japan Institute of Multidisciplinary Sciences Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama240-8501 Japan

Multimode fiber (MMF) imaging aided by machine learning holds promise for numerous applications, including medical endoscopy. A key challenge for this technology is the sensitivity of modal transmission characteristics to environmental perturbations. Here, we show experimentally that an MMF imaging scheme based on a neural network (NN) can achieve results that are significantly robust to thermal perturbations. For example, natural images are successfully reconstructed as the MMF's temperature is varied by up to 50◦C relative to the training scenario, despite substantial variations in the speckle patterns caused by thermal changes. A dense NN with a single hidden layer is found to outperform a convolutional NN suitable for standard computer vision tasks. In addition, we demonstrate that NN parameters can be used to understand the MMF properties by reconstructing the approximate transmission matrices, and we show that the image reconstruction accuracy is directly related to the temperature dependence of the MMF's transmission characteristics. © 2024, CC BY.

关键词： Multimode fibers

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Corrigendum to “Design and operation of a versatile low-cost high-flux solar simulator for automated CPV cell and module testing” [Sol. Energy 228 (2021) 387–404]

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Solar Energy 2022年 247卷 269-269页

作者： A. Buchroithner B. Gerl R. Felsberger H. Wegleiter Institute of Electrical Measurement and Sensor Systems Graz University of Technology Graz Austria

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Bandwidth Based Design Methodology for Wiener Filters for Online Signal Denoising

Bandwidth Based Design Methodology for Wiener Filters for On...

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IEEE Instrumentation and measurement technology Conference

作者： M. Neumayer T. Bretterklieber Institute of Electrical Measurement and Sensor Systems Graz University of Technology Graz Austria

ISBN: (数字)9781728144603

ISBN: (纸本)9781728144610

Online signal denoising refers to a digital filtering techniques in order to estimate a signal s[n] from the noisy signal x[n] = s[n] + v[n], where v[n] is noise. Standard filtering techniques lead to a time delay of the signal estimate ŝ[n], which is caused by the group delay of the filter. Wiener filtering is one possible way to reduce this delay. The design of a Wiener filter requires a statistical model of the signal s[n] and the measurement noise v[n]. The noise model can be determined by means of signal analysis of the measurement noise v[n]. The modeling of the signal s[n] on the other hand requires more dedicated analysis. This makes the application of this filter less practicable. In this paper a design methodology for Wiener filters is presented. The modeling of the signal is done by means of the signal bandwidth, hence the design effort is equal to the design of a standard digital filter. Also the same design tools, e.g. a filter design methods, can be used. The performance of the approach is presented by means of simulation studies and a measurement example.

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Model Based Compensation of Thermal Drifts for Multi Electrode Capacitive Sensing

Model Based Compensation of Thermal Drifts for Multi Electro...

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IEEE Instrumentation and measurement technology Conference

作者： T. Suppan M. Neumayer T. Bretterklieber H. Wegleiter Institute of Electrical Measurement and Sensor Systems Graz University of Technology Graz Austria

ISBN: (数字)9781728144603

ISBN: (纸本)9781728144610

Capacitive sensing has become a favourable measurement technology for industrial applications. A main advantage of capacitive sensors is the contactless working principle, which enables capacitive sensors for the application in industrial processes with harsh environmental conditions. Multi electrode capacitive sensing is used to obtain information about objects in a region of interest. This requires dedicated model based signal processing techniques and accurate physical models of the measurement process. Industrial processes often entail high temperatures, which leads to thermal drifts of the material values and to thermal expansions within the sensor front end. In order to draw reliable conclusions about the quantities of interest, these effects have to be taken into account. In this paper we present a model based temperature compensation approach for capacitive multi electrode structures, which considers temperature related permittivity changes as well as structural displacements due to thermal expansions to reduce the impact of thermal drifts. The proposed approach is validated on the example of an electrical capacitance tomography sensor.

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Feasibility Evaluation of Optoelectronic Strain measurement for Flywheel Rotors

Feasibility Evaluation of Optoelectronic Strain Measurement ...

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IEEE Instrumentation and measurement technology Conference

作者： Matthias Rath Rupert Preßmair Bernhard Schweighofer Georg Brasseur Institute of Electrical Measurement and Sensor Systems Graz University of Technology Graz Austria

ISBN: (数字)9781728144603

ISBN: (纸本)9781728144610

The rotor is a core element of a Flywheel Energy Storage System (FESS) and its condition has to be monitored continuously to assure safe operation. Modern flywheel rotors are usually made of carbon-fiber-reinforced polymer (CFRP) composites because of their high inherent specific energy density. Throughout the service life the stress state inside the rotor changes due to long-term effects of the material. Therefore, the strain profile is an interesting measure for the rotor's health condition. The chosen measurement principle requires a surface finish of the rotor with a periodic pattern of contrasting areas. A preliminary evaluation of the feasibility of different optoelectronic measurement setups with focus on different rotor materials, surface finishes and the high rotational speed of the rotor was conducted. Adhesion properties and influences of different rotor surface finishes as well as the influence of the photodiode's rise time are investigated.

关键词： flywheel optical strain measurement rotor surface finish CFRP Surface finish Rotors carbon fibre reinforced plastics flywheels Photoelectricity High rotating speed Strain measurement flywheel energy storage system measurement principle Mucilages, Adhesive rotor speed Photodiodes

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Magnetic Energy Harvesting on Overhead High Voltage Lines: Weight Optimized Transformer Design for High Power Output

Magnetic Energy Harvesting on Overhead High Voltage Lines: W...

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IEEE Instrumentation and measurement technology Conference

作者： M. Neumayer T. Bretterklieber G. Gruber G. Brasseur Institute of Electrical Measurement and Sensor Systems Graz University of Technology Graz Austria

ISBN: (数字)9781728144603

ISBN: (纸本)9781728144610

Magnetic energy harvesting is a technique to obtain electric energy from the AC-current forms the primary winding. It is a suitable energy harvesting technique for measurement systems on overhead high voltage lines (OHL). For OHL applications with a high power demand also other aspects have to be considered, e.g. the weight of the system. Furthermore, the high dynamic range of the primary current is an important parameter. In this work the behavior of the transformer of a magnetic energy harvesting systems is studied. A model for the transformer is presented, which is suitable for the high current range in OHL applications. Comparative measurement studies are presented to validate the theoretical predictions with respect to the achievable power density.

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Fibre Optical Ice Sensing: sensor Model and Icing Experiments for Different Ice Types

Fibre Optical Ice Sensing: Sensor Model and Icing Experiment...

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IEEE Instrumentation and measurement technology Conference

作者： A. Siegl M. Neumayer T. Bretterklieber Institute of Electrical Measurement and Sensor Systems Graz University of Technology Graz Austria

ISBN: (数字)9781728144603

ISBN: (纸本)9781728144610

Atmospheric ice growth can be a potential hazard for structures like high-voltage lines, wind turbines or antennas in alpine regions. Fibre optical ice sensing is a possible approach to detect and monitor ice accretion. The sensing principle is based on the optical coupling between individual glass fibre bundles due to the accreted ice. Recent publications show the feasibility of ice monitoring with this approach by means of experimental studies. In this paper the properties and capabilities of fibre optical sensing for ice detection and thickness measurement are investigated by means of sensor modelling and sensor simulation, as well as dedicated measurements using a prototype. A new sensor model is developed, which includes all relevant interactions between the sensor and the ice accretion process. Simulations for different ice types are performed where the random nature of the ice accretion process is considered. By means of the measurements, the simulation results are verified and the sensor can be assessed for different types of ice regarding its capabilities to detect early ice formation and to measure the ice thickness.

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Kinematic simulation to investigate the influence of the cutting edge topography when ball end micro milling 18

Kinematic simulation to investigate the influence of the cut...

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18th CIRP Conference on Modeling of Machining Operations, CMMO 2021

作者： Klauer, Katja Altherr, Nicolas Eifler, Matthias Kirsch, Benjamin Böß, Volker Seewig, Jörg Aurich, Jan C. Institute for Manufacturing Technology and Production Systems Technische Universität Kaiserslautern Gottlieb-Daimer Str. Kaiserslautern67663 Germany Institute for Measurement and Sensor-Technology Technische Universität Kaiserslautern Gottlieb-Daimer Str. Kaiserslautern67663 Germany IU University of Applied Sciences Juri-Gagrin-Ring 152 Erfurt99084 Germany Institute of Production Engineering and Machine Tools Leibniz Universität Hannover An der Universität 2 Gabsen30823 Germany

During the ball end micro milling of material measures, the cutting edge topography is imaged on the machined workpiece. The influence of the chipping on the resulting surface quality is much more dominant than other kinematic effects. In this simulative study, a model is built that is able to predict the correlation between the cutting edge topography and the resulting workpiece topography. Thus, the mentioned correlation can be investigated without overlaying effects of material separation or measurement uncertainties, which are unavoidable in an experimental study. The model has been validated based on four artificial chippings. © 2021 Elsevier B.V.. All rights reserved.

关键词： Topography

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Tracking of Magnetic Micromotors in Confined Channels Through Scattering Tissue 15

Tracking of Magnetic Micromotors in Confined Channels Throug...

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15th IEEE International Conference on Nano/Molecular Medicine and Engineering, NANOMED 2021

作者： Aziz, Azaam Karnaushenko, Dmitriy Koukourakis, Nektarios Czarske, Jurgen W. Schmidt, Oliver G. Medina-Sanchez, Mariana Institute For Integrative Nanosciences Leibniz Institute For Solid State And Materials Research Dresden01069 Germany Measurement And Sensor System Technique And Competence Center Biolas Tu Dresden School of Engineering Dresden01069 Germany School of Science Cluster of Excellence Physics of Life Tu Dresden Germany Faculty of Physics Dresden TU Germany Professorship of Material Systems For Nanoelectronics Chemnitz University of Technology Chemnitz09111 Germany

ISBN: (纸本)9781665458566

The field of small-scale microdevices is growing rapidly towards the development of tethered/untethered microsensors and therapeutic agents that can move through narrow vascular networks in living organisms to diagnose and treat for example vascular diseases. However, imaging and localization of such microdevices are challenging under scattering tissue due to the lack of high spatial and temporal resolution that compromises the penetration depth and therefore the application scenario. Here, we report the tracking of magnetically-driven rolling micromotors (20 μm in diameter) through scattering tissue (1.2 mm thickness) using reflective infrared (IR) imaging. This technique provides high spatiotemporal resolution for the tracking of micro-agents in a narrow vascular network. As a potential application, we suggest the use of such micro-agents as micro-viscosimeters, in which by analyzing their dynamics, one can extract some basic information on the surrounding fluid properties which might be related to certain health status. © 2021 IEEE.

关键词： Micromotors

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Influence of different cooling strategies during hard turning of AISI 52100 - Part II: Characterization of the surface and near surface microstructure morphology 5

Influence of different cooling strategies during hard turnin...

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5th CIRP Conference on Surface Integrity, CSI 2020

作者： Ankener, Werner Uebel, Julian Basten, Stephan Smaga, Marek Kirsch, Benjamin Seewig, Jörg Aurich, Jan C. Beck, Tilmann Institute of Materials Science and Engineering TU Kaiserslautern Gottlieb-Daimler-Str. Kaiserslautern67663 Germany Institute for Measurement and Sensor Technology TU Kaiserslautern Gottlieb-Daimler-Str. Kaiserslautern67663 Germany Institute for Manufacturing Technology and Production Systems TU Kaiserslautern Gottlieb-Daimler-Str. Kaiserslautern67663 Germany

This two-part paper addresses the impact of seven different cooling conditions on the finishing process as well as the resulting surface and near-surface microstructure morphology of the rolling bearing steel AISI 52100 in martensitic heat treatment state. The applied cooling strategies are liquid nitrogen (LN2-) cooling, CO2-snow cooling at varied mass flows, sub-zero metalworking fluids (MWF) at varied supply temperatures, and dry machining. Part II of the paper concerns the changes in surface roughness, examined by an angle resolved scatter light sensor, micro hardness measurement, microstructure observations, residual stress and phase composition analyses in the near-surface area, caused by the turning process, that is characterized in Part I. The lowest cooling performance, i.e. dry machining, results in low compressive axial residual stresses and a high proportion of retained austenite at the near-surface area. High cooling performance strategies like CO2 cooling or sub-zero MWF show an opposite distribution of the mentioned parameters, wherein the coolants' lubrication effect is an important aspect. Microstructural differences resulting from the process parameters used in these investigations tend to be less significant. Thus, they do not allow reliable assignment of the microstructure to the cooling strategies used. However, different cooling conditions show an impact on residual stresses, phase distribution and surface topography of the workpieces to varying extents. © 2020 The Author(s).

关键词： Cooling

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