检索结果-内蒙古大学图书馆

sensors and Communication Technologies in the 1 GHz to 10 THz Band 2024

作者： Töfferl, Michael Schossmann, A. Schmidt, C. Banzer, P. Bergmann, A. Graz University of Technology Department of Electrical Measurement and Sensor Systems Inffeldgasse 33/I GrazA-8010 Austria University of Graz Department of Physics Universitätsplatz 5 GrazA-8010 Austria

ISBN: (纸本)9781510681149

Due to its ability to meet requirements such as e.g. telemetry, millimeter-wave transceiver technology has gained research interest for various sensor applications, including the automotive and consumer sector. This work presents a resonant metamaterial for millimeter-waves that enables telemetric position sensing. The concept is based on a resonant unit cell that can be tuned to enable position encoding. A 2D metamaterial design was developed to parametrize the resonance frequency via a geometric parameter of the structure. The tuneable range of the metamaterial was estimated using a finite element method (FEM) simulation. This allowed for a unique mapping of resonance frequency and the geometric parameter, where a linear range for the sensor effect was selected. The resonance frequency shift encodes the absolute position via the geometry parameter of the metamaterial. A linear position encoded bar was fabricated using well-known PCB manufacturing techniques for position determination. The position encoded metamaterial was successfully tested with a vector network analyser under lab conditions. This telemetric position sensor concept offers a compact and contactless readout without mechanical interference with the moving object. The metamaterial is completely passive, resulting in low maintenance and failure issues. The overall sensor concept includes a state-of-the-art radar chip as millimeter-wave transceiver which is currently under development. © 2024 SPIE.

关键词： metamaterial millimeter-wave position sensing

来源：评论

学校读者我要写书评

暂无评论

Analytical Description of Transversally Symmetric Hinges with Semicircular Contours 16th

Analytical Description of Transversally Symmetric Hinges wi...

引用

16th International Federation of Theory of Machines and Mechanisms World Congress, IFToMM WC 2023

作者： Jahn, Hannes Fröhlich, Thomas Zentner, Lena TU Ilmenau Department of Mechanical Engineering Mechanics of Compliant Systems Group Ilmenau98693 Germany TU Ilmenau Department of Mechanical Engineering Institute of Process Measurement and Sensor Technology Ilmenau98693 Germany

ISBN: (纸本)9783031457081

Compliant mechanisms are becoming increasingly important, especially in force measurement and weighing technology, due to their zero backlash, wear resistance, and zero friction. Their deformation under external forces can be analyzed well with analytical calculations and FEM simulations. Analytically, only mechanisms with symmetrical and longitudinally symmetrical hinges are described. This paper presents a method that allows transversally symmetric hinges to be described analytically. The model must be computed numerically due to the built neutral fiber and the nonlinearities in the used calculation method. The developed method is then compared with FEM calculations in a parameter study and considered to be validated. Finally, outlooks are formulated on how the created method can for instance be used to develop load cells for later calculations. Moreover, it is shown to what extent it is possible to implement this method for general calculations of compliant mechanisms. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Hinges

来源：评论

学校读者我要写书评

暂无评论

Features Selection for Force Myography Based Hand Gesture Recognition

Features Selection for Force Myography Based Hand Gesture Re...

引用

2023 IEEE Jordan International Joint Conference on Electrical Engineering and Information technology, JEEIT 2023

作者： Fora, Malak Jaradat, Manar Atitallah, Bilel Ben Wu, Congyu Kanoun, Olfa State University of New York Department of Systems Science and Industrial Engineering Binghamton United States Technische Universität Chemnitz Professorship of Measurement and Sensor Technology Chemnitz Germany

ISBN: (纸本)9798350324051

Hand gesture recognition has a wide range of applications in robotics, game control, and in communication with the deaf and people with trouble hearing. Recognition of American sign language (ASL) hand gestures has been extensively studied in the literature. Multiple data sources and different features extracted from these data were used to classify ASL gestures. In this study, we examined the features used in previous research to determine the minimum number of features that can give an accurate classification of ASL hand gestures. Force myography (FMG) signals captured for ASL gestures of digits 0-9 were used in this analysis of the selected features. Extracted features from the raw FMG signals were applied to K-nearest neighbors (KNN) and Extreme Learning Machine (ELM) to evaluate their efficiency in identifying the corresponding hand gesture. Results show that using only the mean value as input to classification algorithms yields the highest classification accuracy. The classification accuracy was 90% and 96.9% for KNN and ELM, respectively. © 2023 IEEE.

关键词： Audition

来源：评论

学校读者我要写书评

暂无评论

Compact Inverse-Designed Metalens for Millimeter-Wave Field Enhancement

Compact Inverse-Designed Metalens for Millimeter-Wave Field ...

引用

2024 IEEE Photonics Conference, IPC 2024

作者： Schmidt, Christoph Töfferl, Michael Schossmann, Alexander Banzer, Peter Bergmann, Alexander Graz University of Technology Institute for Measurement and Sensor Systems Inffeldgasse 33/I Graz8010 Austria Christian Doppler Laboratory for Structured Matter Based Sensing Inffeldgasse 33 and Universitätsplatz 5 Graz8010 Austria University of Graz Department of Physics Universitätsplatz 5 Graz8010 Austria

ISBN: (纸本)9798350361957

Enhancing fields is an important task in millimeter-wave applications, such as nondestructive microwave inspection, metamaterial sensing applications, or millimeter-wave imaging. This demand for compact yet high-performance devices for field enhancement operating in the millimeter-wave regime has led to innovative approaches regarding lens design. State-of-the-art lens designs in this wavelength regime tend to be bulky and operate in the far field, making them unsuitable for small form factor applications. In this context, formulating the required functionality and algorithmically looking for the desired material topology is an inversion of the standard approach. This paper presents an inverse-designed field-amplifying metalens operating in the near field of a 60GHz patch antenna. With a size of about three times the wave length, the given structure promises good performance while maintaining a smaller form factor than conventional solutions. It yields an enhancement of the power amplitude by over 7dB. © 2024 IEEE.

关键词： Inverse problems

来源：评论

学校读者我要写书评

暂无评论

Improved Particle Swarm Optimization Algorithm for EIT Image Reconstruction 20

Improved Particle Swarm Optimization Algorithm for EIT Image...

引用

20th International Multi-Conference on systems, Signals and Devices, SSD 2023

作者： Kahouli, Oumayma Hafsa, Mariem Hellara, Hiba Bennour, Imed Eddine Essoukri Ben Amarax, Najoua Kanoun, Olfa University of Sousse National Engineering School of Sousse Department of Computer Science Sousse4023 Tunisia National Engineering School of Sousse Laboratory of Advanced Technology and Intelligent Systems Tunisia Technische Universität Chemnitz Laboratory of Measurement and Sensor Technology Chemnitz Germany University of Sfax Laboratory of Signals Systems Artificial Intelligence and Networks Digital Research Center of Sfax Tunisia

ISBN: (纸本)9798350332568

Electrical Impedance Tomography (EIT) is a clinical imaging technique that gained a lot of attention because it is a non-invasive and radiation-free method. To obtain an inner image of the domain under study, a specific number of electrodes is attached to the surface of the object, then through a pair of electrodes, a low alternative current is injected. Potentials produced by this injection are measured with the remaining electrodes. Based on these boundary voltages measurements, the inner conductivity can be inferred, thus the image is reconstructed. The focus of this paper is to overcome the major weakness of the EIT image reconstruction technique, which is the low spatial resolution of the reconstructed images caused by the non-linearity of EIT inverse problem. This paper considers this problem, an optimization problem that is solved using the Particle Swarm Optimization (PSO) meta-heuristic. A variant of the standard PSO is proposed and validated, first on a circular mesh composed of 686 triangles then on a lung mesh composed of 2707 triangles. © 2023 IEEE.

关键词： Electrodes

来源：评论

学校读者我要写书评

暂无评论

Compact Inverse-Designed Metalens for Millimeter-Wave Field Enhancement

Compact Inverse-Designed Metalens for Millimeter-Wave Field ...

引用

IEEE Photonics Conference (IPC)

作者： Christoph Schmidt Michael Töfferl Alexander Schossmann Peter Banzer Alexander Bergmann Institute for Measurement and Sensor Systems Graz University of Technology Graz Austria Christian Doppler Laboratory for Structured Matter Based Sensing Graz Austria Department of Physics University of Graz Graz Austria

ISBN: (数字)9798350361957

ISBN: (纸本)9798350361964

关键词： Millimeter wave technology Rapid prototyping Reproducibility of results Topology sensors Printers Polymers Microwave filters Standards Lenses

来源：评论

学校读者我要写书评

暂无评论

Electrical Impedance Tomography Image Reconstruction with apriori Knowledge for Gesture Recognition 19

Electrical Impedance Tomography Image Reconstruction with ap...

引用

19th IEEE International Multi-Conference on systems, Signals and Devices, SSD 2022

作者： Alasasfeh, Hayat Hafsa, Mariem Bader, Oumaima Ibbini, Mohammed Hasan, Sameer Kanoun, Olfa Jordan University of Science and Technology Biomedical Engineering Department Irbid Jordan Université de Sousse Ecole Nationale d'Ingénieurs de Sousse LATIS- Laboratory of Advanced Technology and Intelligent Systems Sousse4023 Tunisia Measurement and Sensor Technology Technische Universität Chemnitz Chemnitz Germany

ISBN: (数字)9781665471084

ISBN: (纸本)9781665471084

Electrical impedance tomography (EIT) reconstructs the conductivity images of an object based on the voltages and the currents at the surface of the object. Among the clinical applications of EIT thorax imaging, brain function monitoring and breast cancer screening. However, EIT suffers from a poor signal-to-noise ratio and spatial resolution. To improve the quality of reconstructed images and provide clear information about the structure, the paper proposes to include prior knowledge about the structure from MRI. The proposed techniques could be very promising with more work. To illustrate this technique in this paper, eight electrodes with the adjacent current pattern were employed in this research. For each gesture, forty data points are recorded. The Gauss-Newton and Back-Projection algorithms are used for image reconstruction with prior knowledge of the human forearm from MRI images. The resultant contours of the Forearm, Ulna, and Radius have been used to build the mesh. In the Gauss-Newton algorithm, the results reveal that structural information improves image quality and conductivity distribution, particularly in the region of two bones. In addition, the reconstructed images using the Gauss-Newton algorithm performed better than images reconstructed using the back-projection algorithm. © 2022 IEEE.

关键词： Image reconstruction

来源：评论

学校读者我要写书评

暂无评论

Low cost 3D printable metamaterial for focused orbital angular momentum generation using mm-wave radar chip technology

Low cost 3D printable metamaterial for focused orbital angul...

引用

International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)

作者： M. Töfferl A. Schossmann A. Bergmann P. Banzer Department of Electrical Measurement and Sensor Systems Inffeldgasse 33/I Graz University of Technology Graz Austria Christian Doppler Laboratory Structured Matter Based Sensing Department of Physics University of Graz Universitätsplatz 5 Graz Austria

ISBN: (数字)9798350373493

ISBN: (纸本)9798350373509

We present a metamaterial for orbital angular momentum generation in the millimeter wave regime that can be fabricated with low-cost fused deposition modeling (FDM) 3D printers. The metamaterial induces a spatially distributed phase shift on millimeter waves, passing through the sample, via a spatial variation of the effective permittivity. We use an analytical model to calculate the effective permittivity of the metamaterial unit cell, which consists of a square block made of a dielectric with a cylindrical air hole at its center. The analytical model is used to design a metasurface that generates a beam carrying orbital angular momentum of order $l=1$. We prove this concept in a laboratory setup using a commercially available millimeter wave chip as the source.

关键词： Orbital calculations Analytical models Solid modeling Three-dimensional displays Millimeter wave radar Metamaterials Printers Frequency division multiplexing Permittivity Standards

来源：评论

学校读者我要写书评

暂无评论

Features Selection for Force Myography Based Hand Gesture Recognition

Features Selection for Force Myography Based Hand Gesture Re...

引用

IEEE Jordan International Joint Conference on Electrical Engineering and Information technology (JEEIT)

作者： Malak Fora Manar Jaradat Bilel Ben Atitallah Congyu Wu Olfa Kanoun Department of Systems Science and Industrial Engineering State University of New York Binghamton United States of America Professorship of Measurement and Sensor Technology Technische Universität Chemnitz Chemnitz Germany

Hand gesture recognition has a wide range of applications in robotics, game control, and in communication with the deaf and people with trouble hearing. Recognition of American sign language (ASL) hand gestures has been extensively studied in the literature. Multiple data sources and different features extracted from these data were used to classify ASL gestures. In this study, we examined the features used in previous research to determine the minimum number of features that can give an accurate classification of ASL hand gestures. Force myography (FMG) signals captured for ASL gestures of digits 0–9 were used in this analysis of the selected features. Extracted features from the raw FMG signals were applied to K-nearest neighbors (KNN) and Extreme Learning Machine (ELM) to evaluate their efficiency in identifying the corresponding hand gesture. Results show that using only the mean value as input to classification algorithms yields the highest classification accuracy. The classification accuracy was 90% and 96.9% for KNN and ELM, respectively.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Multicore fiber with thermally expanded cores for increased collection efficiency in endoscopic imaging

引用

Light(Advanced Manufacturing) 2024年第4期5卷 102-109页

作者： Kinga Zolnacz Ronja Stephan Jakob Dremel Katharina Hausmann Matthias Lieβmann Michael Steinke Juergen Czarske Robert Kuschmierz Chair of Measurement and Sensor System Technique TU Dresden01069 DresdenGermany Department of Optics and Photonics Wroclaw University of Science and Technology50370 WroclawPoland Institute of Quantum Optics Leibniz University Hannover30167 HannoverGermany Competence Center for Biomedical Computational Laser Systems(BIOLAS) TU Dresden01069 DresdenGermany Else Kroner Fresenius Center for Digital Health(EKFZ) TU Dresden01307 DresdenGermany Cluster of Excellence PhoenixD Leibniz University Hannover30167 HannoverGermany

Fiber-based endoscopes are promising for minimally invasive in vivo biomedical *** fibers offer high resolution ***,to avoid image deterioration induced by inter-core coupling,significant spacing between cores is required,which limits the active image guiding area of the ***,they suffer from low light collection efficiency and decreased signal-to-noise *** this paper,we present a method to increase the collection efficiency by thermally expanding the cores at the facet of a multicore *** expansion is based on the diffusion of doping material of the cores,thus the fiber’s original outer diameter is *** enlarging the core diameter by a factor of 2.8,we increase the intensity of the transmitted light by a factor of up to *** results in a signal-to-noise ratio increase by a factor of up to 4.6 and significant improvement in the image *** improvement increases with increasing working distance but is already prominent for as small working distance as 0.5 *** feasibility of the method is proved experimentally by lensless single-shot imaging of a test chart and incoherent light reflected from clusters of *** demonstrated approach is an important tool especially in imaging of biological specimens,for which phototoxicity must be avoided,and therefore,high collection efficiency is required.

关键词： Thermally expanded cores fiber Multicore fiber Lensless imaging

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：