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Corrigendum to “Flexsensor: Automated measurement software for rapid photonic circuits capturing” [SoftwareX, Volume 27, September 2024, 101879]

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SoftwareX 2024年 28卷

作者： Christoph Schmidt Jakob Wilhelm Hinum-Wagner Reinhard Klambauer Alexander Bergmann Graz University of Technology Institute of Electrical Measurement and Sensor Systems Graz Austria ams-OSRAM AG Tobelbaderstraße 30 Premstaetten Austria

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Securing Data in Multimode Fibers by Exploiting Mode-Dependent Light Propagation Effects

arXiv

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arXiv 2022年

作者： Rothe, Stefan Besser, Karl-Ludwig Krause, David Kuschmierz, Robert Koukourakis, Nektarios Jorswieck, Eduard Czarske, Jürgen W. TU Dresden Faculty of Electrical and Computer Engineering Laboratory of Measurement and Sensor System Technique Dresden01062 Germany TU Braunschweig Faculty of Electrical Engineering Information Technology Physics Institute for Communications Technology Braunschweig38106 Germany TU Dresden Faculty of Physics Dresden01062 Germany

Multimode fibers hold great promise to advance data rates in optical communications but come with the challenge to compensate for modal crosstalk and mode-dependent losses, resulting in strong distortions. The holographic measurement of the transmission matrix enables not only correcting distortions but also harnessing these effects for creating a confidential data connection between legitimate communication parties, Alice and Bob. The feasibility of this physical-layer-security-based approach is demonstrated experimentally for the first time on a multimode fiber link to which the eavesdropper Eve is physically coupled. Once the proper structured light field is launched at Alice's side, the message can be delivered to Bob, and, simultaneously, the decipherment for an illegitimate wiretapper Eve is destroyed. Within a real communication scenario, we implement wiretap codes and demonstrate confidentiality by quantifying the level of secrecy. Compared to an uncoded data transmission, the amount of securely exchanged data is enhanced by a factor of 538. The complex light transportation phenomena that have long been considered limiting and have restricted the widespread use of multimode fiber are exploited for opening new perspectives on information security in spatial multiplexing communication systems. © 2022, CC BY.

关键词： Multimode fibers

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Frequency-dependent Ultrasonic Stimulation of PNIPAM Microgels in Water

arXiv

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arXiv 2022年

作者： Razavi, Atieh Rutsch, Matthias Wismath, Sonja Kupnik, Mario von Klitzing, Regine Rahimzadeh, Amin Soft Matter at Interfaces Institute for Condensed Matter Physics Technische Universität Darmstadt Hochschulstraße 8 Darmstadt64289 Germany Measurement and Sensor Technology Department of Electrical Engineering and Information Technology Technische Universität Darmstadt Merckstraße 25 Darmstadt64283 Germany

As a novel stimulus, we use high-frequency ultrasonic waves to provide the required energy for breaking hydrogen bonds between Poly(N-isopropylacrylamide) (PNIPAM) and water molecules while the solution temperature maintains below the volume phase transition temperature (VPTT=32 °C). Ultrasonic waves propagate through the solution and their energy will be absorbed due to the liquid viscosity. The absorbed energy partially leads to the generation of a streaming flow and the rest will be spent to break the hydrogen bonds. Therefore, the microgels collapse and become insoluble in water and agglomerate, resulting in solution turbidity. We use turbidity to quantify the ultrasound energy absorption and showed that the acousto-response of PNIPAM microgels is a temporal phenomenon that depends on the duration of the actuation. Increasing the solution concentration leads to a faster turbidity evolution. Furthermore, an increase in ultrasound frequency leads to an increase in the breakage of more hydrogen bonds within a certain time and thus faster turbidity evolution. This is due to the increase in ultrasound energy absorption by liquids at higher frequencies. © 2022, CC BY.

关键词： Hydrogen bonds

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Hand-Guided Mobile Terahertz 3D Imaging Platform with Aspherical Telecentric f-θ Optics

Hand-Guided Mobile Terahertz 3D Imaging Platform with Aspher...

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European Radar Conference (EURAD)

作者： Shiva Mohammadzadeh Andreas Keil Sven Leuchs Christian Krebs Dirk Nü ß ler Jö rg Seewig Fabian Friederich Materials Characterization and Testing Fraunhofer Institute for Industrial Mathematics ITWM Kaiserslautern Germany Becker Photonik GmbH Porta Westfalica Germany Fraunhofer Institute for High Frequency Physics and Radar Techniques FHR Wachtberg Germany Institute for Measurement and Sensor Technology TU Kaiserlautern Kaiserslautern Germany TU Kaiserslautern Kaiserslautern Germany

We present a hand-guided mobile terahertz imaging platform for non-destructive testing (NDT). The scanner acquires volumetric 3D image data using an integrated FMCW radar module in combination with a line scanning optics and a position encoder. Consisting of a galvanometer scanner mirror and an aspherical telecentric f-theta lens, the optical system enables B-scans perpendicular to the manual motion over a width of 2 cm. The guiding wheel system of the platform allows precise movement along cracks and welds, for example, enabling the volumetric inspection of the corresponding structures. The platform is optimized for working frequencies of up to 300 GHz. The frequency adaptability of the platform is demonstrated by measurements using a SiGe-chip-based 80 GHz FMCW radar module.

关键词： Terahertz wave imaging Three-dimensional displays Welding Wheels Radar Bandwidth Radar imaging

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Retrospective motion correction for Fast Spin Echo based on conditional GAN with entropy loss 4

Retrospective motion correction for Fast Spin Echo based on ...

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2021 4th International Conference on Advanced Algorithms and Control Engineering, ICAACE 2021

作者： Chen, Yalei Li, Pingan Liu, Kewen Bao, Qingjia Li, Zhao Li, Xiaojun Information and Communication Engineering Wuhan University of Technology Wuhan Hubei430070 China Hubei Key Laboratory of Broadband Wireless Communication and Sensor Networks Wuhan University of Technology Wuhan430070 China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Center for Magnetic Resonance Wuhan Institute of Physics and Mathematics Innovation Academy for Precision Measurement Science and Technology Wuhan430071 China Department of Chemical and Biological Physics Weizmann Institute of Science Rehovot Israel

We proposed a new end-to-end motion correction method based on conditional generative adversarial network (GAN) and minimum entropy of MRI images for Fast Spin Echo (FSE) sequence. The network contains an encoder-decoder generator to generate the motion-corrected images and a PatchGAN discriminator to classify an image as either real (motion-free) or fake(motion-corrected). Moreover, the image's entropy is set as one loss item in the cGAN's loss as the entropy increases monotonically with the motion amplitude, indicating that entropy is a good criterion for motion. The results show that the proposed method can effectively reduce the artifacts and obtain high-quality motion-corrected images from the motion-affected images in both pre-clinical and clinical datasets. © Published under licence by IOP Publishing Ltd.

关键词： Generative adversarial networks

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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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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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E-textile technology: from materials to applications and wireless distance transfer

E-textile technology: from materials to applications and wir...

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IEEE SSD International Multi-Conference on Systems, Signals and Devices

作者： Yosra Ben Fadhel Ghada Bouattour Dhouha Bouchaala Nabil Derbel Olfa Kanoun Biomedical Engineering Higher Institute of Medical Technologies University of Tunis El-Manar Tunis Tunisia Electric Engineering Technische Universität Chemnitz Chemnitz Germany Digital Research Center of Sfax University of Sfax Sfax Tunisia National School of Engineering of Sfax University of Sfax Sfax Tunisia Measurement and Sensor Technology Technische Universität Chemnitz Chemnitz Germany

Wearable technology is suitable for specific electronic applications in a variety of industries, including healthcare, entertainment, sports, and military. Although the market for wearable technology is growing, most of the present devices are battery-powered accessories, and their form factors prevent them from taking advantage of the human body's huge surface area for spatiotemporal sensing or energy harvesting from movements. However, consumer devices have been hard to come by due to the inherent difficulties in replicating traditional manufacturing technologies (that have enabled these wearable accessories) on textiles. E-textiles offers an opportunity to expand on current wearables to enable such applications via the larger surface area offered by garments. Additionally, the requirement for textiles to be flexible, and machine washable has been shown to be incompatible with the powering of e-textile devices using battery energy, like in wearable accessories. The pathway to industry-scale commercialization is still unclear, despite the fact that recent research on e-textiles has revealed improvements in materials, novel processing methods, and unique e-textile prototype devices. In addition, active E-textile devices requires a comfortable source of power to remove the batteries' use drawbacks. The distance transfer is one of the biggest challenge of this technology. This article discusses the advancements made in the technology used to create smart textiles with a big focus on the wireless power transfer techniques. It points out difficulties that prevent the industry from adopting the indicated fabrication technologies and devices for mass-market commercialization.

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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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