检索结果-内蒙古大学图书馆

2023 European Workshop on Optical Fibre sensors, EWOFS 2023

作者： Buchfellner, Fabian Bian, Qiang Röhrl, Alexander Zhang, Fan Hu, Wenbin Yang, Minghong Koch, Alexander W. Roths, Johannes Photonics Lab Munich University of Applied Sciences Munich80335 Germany Institute for Measurement Systems and Sensor Technology Technical University Munich Munich80333 Germany National Engineering Research Center for Optical Fiber Sensing Technology Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9781510665002

A temperature-compensated sensor architecture for a fiber optic hydrogen sensor consisting of a partly palladium-coated pi-shifted fiber Bragg grating was modeled and compared with measurements. The transfer matrix formalism was used to calculate the spectral line shape of the pi-shifted FBG with a hydrogen-induced, non-homogeneous strain distribution along the grating axis. The temperature response of the grating itself can be compensated by referencing the notch to the flank wavelength. In addition, the hydrogen solubility in Pd shows a non-linear temperature dependence that was also included in the sensor performance calculations. For the investigated H2 concentration range of 200 ppm to 20000 ppm and between 15 °C and 40 °C, measurement data fit well to the simulation above 3000 ppm but become diffuse below, indicating deviations from the expected dependence according to Sieverts’ square root law. © 2023 SPIE.

关键词： Fiber Bragg gratings

来源：评论

学校读者我要写书评

暂无评论

Millimeter wave metamaterial for high-order orbital angular momentum generation 17

Millimeter wave metamaterial for high-order orbital angular ...

引用

17th International Congress on Artificial Materials for Novel Wave Phenomena, Metamaterials 2023

作者： Schossmann, Alexander Tofferl, Michael Bergmann, Alexander Graz University of Technology Institute of Electrical Measurement and Sensor Systems Inffeldgasse33/I Graz8010 Austria Christian Doppler Laboratory for Structured Matter Based Sensing Inffeldgasse 33/I Graz8010 Austria

ISBN: (纸本)9798350332445

We propose a millimeter wave metamaterial for high-order OAM generation. The concept uses a reflecting metasurface irradiated by a small antenna (e.g., on-chip antenna) that emits linearly polarized millimeter waves at an operating frequency of 61 GHz. We present the numerical proof of principle using finite element simulations. Results show that OAM generation of the order of ten is feasible by varying one geometrical parameter of the metamaterial unit cell. Subsequent work is to further optimize the OAM generation by combining variations of multiple parameters to minimize the amplitude response variation and experimentally analyze the concept. © 2023 IEEE.

关键词： Metamaterials

来源：评论

学校读者我要写书评

暂无评论

An Empirical Model for State of Charge Estimation Based on Electrochemical Impedance Spectroscopy

An Empirical Model for State of Charge Estimation Based on E...

引用

2024 IEEE International Conference on Electrical systems for Aircraft, Railway, Ship Propulsion and Road Vehicles and International Transportation Electrification Conference, ESARS-ITEC 2024

作者： Ibrahim, Khaled Sabathiel, Silvester Farooq, Farhan Hofer, Gunter Bergmann, Alexander Heer, Rudolf Graz University of Technology Electronic Sensors Silicon Austria Labs Graz Austria Silicon Austria Labs Collaborative Perception and Learning Graz Austria Silicon Austria Labs Electronic Sensors Graz Austria Infineon Technologies Graz Austria Institute of Electrical Measurement and Sensor Systems Graz University of Technology Graz Austria

ISBN: (纸本)9798350373905

Electrochemical Impedance Spectroscopy (EIS) is an accurate method used to study the internal properties of lithium-ion (Li-ion) battery cells. It is important to accurately estimate the State of Charge (SoC) of Li-ion battery cells for safety and longevity considerations. There are several methods to estimate the SoC;however, accurate methods require a lot of computational resources and increase the system complexity. This paper proposes an EIS-based experimental method for SoC estimation based on calculating the area under the EIS magnitude vs. frequency curve and correlating the result with SoC. The results demonstrate a relationship between the EIS magnitude and the SoCs within a certain range and under specific conditions. Furthermore, the suggested method reduces the errors and eliminates the need for fitting the EIS impedance spectrum for SoC estimation. © 2024 IEEE.

关键词： System-on-chip

来源：评论

学校读者我要写书评

暂无评论

System-Based Monitoring Approach for Mechanical Seals Using Excited Mechanical Resonances by an Electromagnetic Acoustic Transducer

System-Based Monitoring Approach for Mechanical Seals Using ...

引用

IEEE Instrumentation and measurement technology Conference

作者： A. Siegl S. Leithner B. Schweighofer H. Wegleiter Institute of Electrical Measurement and Sensor Systems Graz University of Technology Graz Austria Institute of Hydraulic Fluid Machinery Graz University of Technology Graz Austria

ISBN: (数字)9798350380903

ISBN: (纸本)9798350380910

Mechanical seals are widely used today for sealing applications in the field of hydraulic fluid machinery. The main components of the seal are the stationary ring and the rotating ring. After the seal is assembled, the sealing gap is formed between the rings. The solid-state contact situation in the gap is crucial for the service life of the seal. To avoid unexpected machine stoppages due to seal failures, monitoring of the seal is required. In this paper, a new approach to seal monitoring is presented. In this approach, the stationary ring is considered as a mechanical system and a specific mechanical resonance of the stationary ring is excited with an electromagnetic acoustic transducer and measured with an accelerometer. The mechanical resonance is influenced by the solid-state contact situation in the sealing gap and the resulting mechanical coupling between the rings. A specially developed test rig is used to press the rings together gradually, thus changing the contact situation in the sealing gap. The changes in the calculated magnitude and phase of the system are evaluated in terms of the ring compression. The results clearly show that the presented approach is suitable to measure the interaction between the two rings, as the magnitude shows a relative change of up to 75 % and the phase increases by 48° when the mechanical coupling is increased by gradually pressing the rings together. These results show that the excited mechanical resonances can be used to indicate mechanical changes in the seal and thus provide the basis for a novel monitoring approach.

关键词： Couplings Acoustic transducers Presses Seals Pressing Mechanical variables measurement Acoustic measurements

来源：评论

学校读者我要写书评

暂无评论

Reducing Injections in Low-Power Electrical Impedance Tomography for Hand Sign Recognition 17

Reducing Injections in Low-Power Electrical Impedance Tomogr...

引用

17th International Workshop on Impedance Spectroscopy, IWIS 2024

作者： Ghoul, Bilel Barioul, Rim Hafsa, Mariem Sahnoun, Salwa Fakhfakh, Ahmed Kanoun, Olfa Chemnitz University of Technology Faculty of Electrical Engineering and Information Technology Measurement and Sensor Technology Chemnitz09126 Germany National School of Electronics and Telecommunications of Sfax Technopole of Sfax Laboratory of Signals Systems Artificial Intelligence and Networks Digital Research Centre of Sfax Ons City 3021 Tunisia Université de Sousse Ecole Nationale d'Ingénieurs de Sousse LATIS- Laboratory of Advanced Technology and Intelligent Systems Sousse4023 Tunisia

ISBN: (纸本)9798331507626

Electrical Impedance Tomography (EIT) is increasingly being used to recognize hand signs due to its internal sensing capabilities. EIT systems operate by injecting a lowamplitude electrical current into the forearm through a set of electrodes and recording the resulting voltages for signal processing. However, this method can result in high power consumption in wearable hand gesture recognition applications due to the current injection-based principle. To overcome this limitation, our investigation focuses on reducing the power consumption of EIT systems by minimizing the number of injected currents. In this study, we propose an injection reduction approach based on ambiguity analysis and the reduction of non-relevant voltage readings. As a result, the proposed method eliminates 3 out of 8 current injections, leading to a 37.5 % reduction in power consumption. This decreases energy usage by 22.5 mW per measurement for a current amplitude of 150 μ A over 10 trials. Further, acquisition time was reduced from 1 second to 0.6 seconds. The classification accuracy using the KNN classifier reached 99 % with full measurements and 96 % with reduced injections. Moreover, a comparative analysis of the reduced injections to forearm anatomy is performed. It demonstrates that bones and high-density muscle areas can affect the current flow and result in inaccurate measurements. These findings demonstrate the potential for reducing current injections in EIT to produce more energy-efficient wearable hand sign recognition systems. © 2024 IEEE.

关键词： Nearest neighbor search

来源：评论

学校读者我要写书评

暂无评论

Evaluation of Adjacent and Opposite Current Injection Patterns for 3D Image Reconstruction of the Human Lung Based on a Realistic Model 17

Evaluation of Adjacent and Opposite Current Injection Patter...

引用

17th International Workshop on Impedance Spectroscopy, IWIS 2024

作者： Bouchhima, Mejda Bader, Oumaima Hafsa, Mariem Sahnoun, Salwa Ben Amara, Najoua Essoukri Kanoun, Olfa National School of Electronics and Telecommunications of Sfax University of Sfax Sfax3038 Tunisia Professorship Measurement and Sensor Technology Chemnitz University of Technology Chemnitz09111 Germany Université de Sousse Ecole Nationale d'Ingénieurs de Sousse LATIS - Laboratory of Advanced Technology and Intelligent Systems Sousse4023 Tunisia Laboratory of Signals Systems Artificial Intelligence and Networks Digital Research Center of Sfax Sfax3038 Tunisia

ISBN: (纸本)9798331507626

Electrical Impedance Tomography (EIT) is a non-invasive, radiation-free imaging technique that can be used for 2D lung imaging. However, 2D EIT has a simplified geometric assumption, which neglects the 3D dynamic lung changes. This study develops a realistic 3D geometrical model including the lungs and thoracic cavity For EIT analysis. Finite Element (FE) models are generated for forward calculation and image reconstruction using an optimized Gauss-Newton (GN) algorithm. Two common current injection patterns - Adjacent and Opposite - are compared. Results show that using the lung-refined model with prior knowledge of the lungs' elements, GN converges with a Pearson correlation (r) of 0.9707 for the opposite pattern, higher than the adjacent pattern which reaches 0.9703. The second metric is the mean squared errors (MSE) between boundary voltages (BV) from reconstructed images and ground truth. It reaches 5.3965 · 10-4,5.3963· 10-4, and 1.0276· 10-12 for the Opposite pattern, respectively, for an empty cavity, lung-refined mesh without, and with prior knowledge of the lungs' elements. The results prove the efficiency of the Opposite injection pattern compared to the Adjacent pattern. These findings highlight the importance of injection patterns and the benefits of using a lung-refined mesh with prior knowledge of the lungs' elements for more accurate reconstructions. © 2024 IEEE.

关键词： Mesh generation

来源：评论

学校读者我要写书评

暂无评论

Flexsensor: Automated measurement Software for Rapid Photonic Circuits Capturing

SSRN

引用

SSRN 2024年

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

This paper introduces the automation measurement software Flexsensor for capturing resonant spectra, an innovative and extensible software program developed explicitly for measuring and evaluating Silicon Photonic (SiPh) circuits. Wafer-level Wafer-level Silicon Photonics allows the integration of numerous optical components and structures on a single wafer. However, researchers and engineers need precise and repeatable measurements to characterize them and face significant challenges when dealing with large numbers of complex systems on a single wafer. A toolchain gap hampers the measuring of such highly integrated photonic structures: While the setup necessitates the integration of an optimized hardware and software toolchain, there is neither software nor a standardized way to implement a reproducible measurement routine for a massive set of measurements. Flexsensor allows integration and control of external hardware (tunable lasers, analog-digital converters) and supports measurement data storage and evaluation. The software enables researchers and engineers to efficiently analyze the spectral response of photonic structures and facilitate rapid measuring. © 2024, The Authors. All rights reserved.

关键词： Silicon photonics

来源：评论

学校读者我要写书评

暂无评论

Design of an Energy Efficient sensor Node for Wearable Applications

Design of an Energy Efficient Sensor Node for Wearable Appli...

引用

IEEE Instrumentation and measurement technology Conference

作者： Abdallah Adawy Achraf Djemal Lidu Wang Ghada Bouattour Ahmed Fakhfakh Olfa Kanoun Measurement and Sensor Technology Faculty of Electrical Engineering and Information Technology Chemnitz University of Technology Chemnitz Germany Laboratory of Signals Systems Artificial Intelligence and Networks Digital Research Centre of Sfax National School of Electronics and Telecommunications of Sfax Technopole of Sfax Tunisia Measurement and Sensor Technology in Production Engineering Leuphana University Lüneburg Germany

ISBN: (数字)9798350380903

ISBN: (纸本)9798350380910

The demand for compact and low-power sensor nodes (SNs) as wearable devices has increased significantly as they contribute significantly to the monitoring of people's health status, providing valuable information for the treatment of various diseases. To address this issue for epilepsy diagnosis, we propose an energy-efficient SN design. The SN incorporates both accelerometer and gyroscope sensors monitoring movements and can be easily attached to an electromyography (EMG) sensor monitoring muscle activities. An internal contact socket allows seamless integration of both devices. The designed system has been tested on a healthy subject and has demonstrated high-quality data measurement. The SN uses low-power Bluetooth 5.0 to communicate with the mobile application, which is designed to modify the built-in sensor parameters and monitor sensor output in real-time. It has an average current consumption of 14.3 mA. In addition, all data from the developed system can be stored on an attached SD card, providing a reliable storage solution.

关键词： Accelerometers Wireless sensor networks Three-dimensional displays Epilepsy Electromyography Real-time systems Energy efficiency

来源：评论

学校读者我要写书评

暂无评论

Assessing the Electrical Properties of DPLF/CNT/PDMS Biocomposite Using Impedance measurements

Assessing the Electrical Properties of DPLF/CNT/PDMS Biocomp...

引用

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

作者： Jawhar Aloulou Ayda Bouhamed Chedly Bradai Olfa Kanoun Laboratory of Electromechanical Systems (LASEM) National Engineering School of Sfax University of Sfax Sfax Tunisia Chair for Measurement and Sensor Technology Chemnitz University of Technology Chemnitz Germany

ISBN: (数字)9798350374131

ISBN: (纸本)9798350374148

In this contribution, a new biocomposite based on natural Palm fibres is explored. Multiwalled carbon nanotubes (MWCNT), Polydimethylsiloxane (PDMS) and Doom palm leaf fibres (DPLF) composite is investigated using simple and cost-effective solution mixing method. This study was done to validate the potential of this novel material for pressure sensing. Thin composite layers containing different concentrations of DPLF and MWCNTs have been realized using stencil printing method. Using MWCNT as a first filler in PDMS polymer, contributes to a piezoresistive properties. In order to investigate the impact of DPLF addition on the electrical properties of the composites, electrical measurements were conducted using impedance spectroscopy and linear sweep voltammetry. The results have shown that the addition of DPLF has a huge impact on the electrical behaviour of the composite, significant base resistance increase, potential change in the percolation threshold and increase in sensitivity.

关键词： Printing Spectroscopy Electric potential Impedance measurement Sensitivity Carbon nanotubes sensors

来源：评论

学校读者我要写书评

暂无评论

System Evaluation of a Pyrometer Combined with an Optical Fiber

System Evaluation of a Pyrometer Combined with an Optical Fi...

引用

IEEE sensors Applications Symposium, SAS

作者： A. Poms B. Schweighofer H. Wegleiter Christian Doppler Laboratory for Measurement Systems for Harsh Operating Conditions Institute of Electrical Measurement and Sensor Systems Graz University of Technology Graz Austria AVL List GmbH Graz Austria

This paper discusses the use of pyrometers in harsh environments where the temperature position to be measured is difficult to access due to space limitations and/or the presence of strong electromagnetic fields. To overcome these challenges, optical fibers are used to guide the infrared radiation to the photodiode that converts it into an electrical signal. It also investigates commercially available optical fibers for their material properties, such as toxicity, and presents a detailed analysis of the components of the measurement chain, including the optical fiber, photodiode, and transimpedance amplifier. Using an optical fiber results in a lower radiation power, mainly due to the limiting acceptance cone of the fiber. A theoretical analysis of the radiation power losses and a practical test rig to verify the results are presented. Overall, the paper provides valuable insights for researchers and engineers in the field of non-contact temperature measurements.

关键词：

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：