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检索条件"任意字段=8th Conference on Current Developments in Optical Design and Optical Engineering"

共 294 条记录，以下是51-60 订阅

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A DEVELOPMENT OF WIDE DYNAMIC-RANGE HALO MONITOR FOR 8 GeV PROTON BEAMS AT FNAL 13

A DEVELOPMENT OF WIDE DYNAMIC-RANGE HALO MONITOR FOR 8 GeV P...

引用

13th International Beam Instrumentation conference, IBIC 2024

作者： Hashimoto, Y. Omori, C. Sato, Y. Toyama, T. Mitsuhasi, T. Tejima, M. Sasaki, T. Uota, M. Ainsworth, R. Sakai, H. KEK/J-PARC Japan FNAL United States Kanto Information Service Co. Ltd. Japan

ISBN: (纸本)9783954502493

the FNAL accelerator complex has been upgrading in increasing beam intensity and beam quality. A new beam halo diagnostic device is required in the beam transport line between booster and Recycler. For this purpose, it was decided to introduce the wide dynamic range monitor technique that was developed in 2012 and has been in operation at the J-PARC beam transport line. the device is a two-dimensional beam profile monitor, and it has a dynamic range of approximately six digits of magnitude by using of optical Transition Radiation and fluorescence screens. Eliminating harmful beam halos is the most important technique for high-intensity proton accelerators. therefore, beam halo diagnosis is indispensable and becomes more and more important. New FNAL device has been manufactured in a collaboration be-tween J-PARC and FNAL as a part of U.S.-Japan Science and Technology Cooperation Program in High Energy Physics. the equipment will be manufactured at J-PARC and will be shipped to FNAL in 2025. We designed the device to satisfy FNAL specifications: the beam energy, intensity, and size. currently, most of the equipment is under construction. the large-aperture optical system has been completed and its optical characteristics are being evaluated at J-PARC. We have been also investigating measurement methods corresponding to FNAL bunch trains. this paper reports on the current status of these developments. © 2024 International Beam Instrumentation conference. All Rights Reserved.

关键词： Fluorescent screens

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Lightning current Monitoring Based on Accurately Tracking State of Polarization by Measuring Stokes Parameters of optical Signal in OPGW Fiber

Lightning Current Monitoring Based on Accurately Tracking St...

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Power and Electrical engineering (ACPEE), 5th Asia conference on

作者： Shukang Han Yize Tang Hongyan Wang Yang Li Hongbing Huang Yuxiang Lv Yehua Zhang Xianfeng Tang State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing China State Grid Zhejiang Electric Power Corporation Information & Telecommunication Branch Zhejiang China Anhui Jiyuan Software Co. Ltd SGITG Hefei China State Grid Information and Telecommunication Branch Beijing China

this paper proposes a scheme of lightning current monitoring based on measuring Stokes parameters in OPGW (optical Power Ground Wire). Compared with traditional lightning current monitoring schemes, this design has many advantages including simple structure and high anti-interference ability. Polarization state of the signal in the OPGW fiber rotates in the direction of propagation due to the magnetic field generated by lightning strong current according to Faraday effect. Accurate tracking of state of polarization can be achieved by analyzing the change of Stokes parameters on Poincare sphere. In the experiment, lightning strikes with a current of 600 kA is successfully monitored by this scheme. Meanwhile, the error of current monitored via the scheme is approximately 1.5% when the interference RSOP is added.

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Study on Magnetic Field Interference Characteristics of Difference Magneto-optical current Transformer

Study on Magnetic Field Interference Characteristics of Diff...

引用

IEEE International conference on Power and Power and Renewable Energy (ICPRE)

作者： Shenwang Li Zhaofei Jin Wenyang Deng Qiuren Su Likun Hu thomas Wu School of Electrical Engineering Guangxi University Nanning China School of Electric Power Engineering South China University of Technology Guangzhou China Department of Information and Electronic Engineering Guangxi Vocational University of Agriculture Nanning China College of Computer and Electronic Information Guangxi University Nanning China

Magneto-optical current transformer has the defect of poor anti-interference ability. In this paper, the interference characteristics of differential magneto-optical current transformer are studied based on the background of interphase magnetic field interference in three-phase power system. By establishing the magnetic field interference model, the anti-magnetic field interference characteristics of the differential magneto-optical current transformer are studied. the research shows that there is a zero magnetic field interference point in the difference magneto-optical current transformer and the zero-interference angle presents a specific distribution law. When the transmission light path of the difference magneto-optical current transformer degenerates to a square arrangement, the value of magnetic field interference has nothing to do with the distance of interference current. Moreover, the square structure makes it have zero-interference angle at a specific angle. the analysis shows that when the interference current deviates from zero-interference angle, the differential magneto-optical current transformer has fault tolerance within a certain range of distance and angle. And it can still meet the requirements of measurement accuracy under the influence of interference current. the simulation results are consistent with the theoretical analysis, which proves the correctness of the theoretical analysis. this research can provide a useful idea for the design of anti-phase magnetic field interference for the application of differential magneto-optical current transformer in power system.

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Growth and fabrication of GaAs-based InAs/AlSb resonant tunneling diode 19

Growth and fabrication of GaAs-based InAs/AlSb resonant tunn...

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19th National conference on Laser Technology and Optoelectronics

作者： Pang, Qiuyao Wu, Donghai Xu, Jianxing Su, Xiangbin Xu, Yingqiang Wang, Guowei Ni, Haiqiao Niu, Zhichuan Key Laboratory of Optoelectronic Materials and Devices Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China College of Electronic Information and Communication Engineering University of Chinese Academy of Sciences Beijing100049 China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing100049 China Microsystem and Terahertz Research Center China Academy of Engineering Physics Sichuan Chengdu610200 China

ISBN: (纸本)9781510683228

With optimized buffer design, we demonstrate a new InAs/AlSb resonant tunneling diode (RTD) on lattice-unmatched semi-insulating (SI) GaAs (100) substrates aiming for terahertz oscillators. To obtain high crystal quality and smooth surface, 5 periods InGaAs/GaAs (2 ML/2 ML) superlattices (SLs) buffer layer was used as dislocation filters (DFs). X-ray diffraction (XRD) measurement showed the full width at half maximum (FWHM) of 331 arcsec and surface roughness of 2.4 nm over 10 μm×10 μm. 8-μm-diam diodes were fabricated by standard mesa process. I-V characteristic of the diodes shows negative conductivity at room temperature and a peak current density of 1.79×105 A • cm-2 was achieved. © 2024 SPIE.

关键词： Resonant tunneling diodes

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Bridge collapse prediction by small displacement data from satellite images under long-term monitoring 8th

Bridge collapse prediction by small displacement data from s...

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8th International conference on Structural engineering, Mechanics and Computation, SEMC 2022

作者： Entezami, A. De Michele, C. Nadir Arslan, A. Department of Civil and Environmental Engineering Politecnico di Milano Milano Italy Helsinki Finland

ISBN: (纸本)9781003348443

Long-term structural health monitoring (SHM) is an effective approach to continuously assess the health and safety of civil structures. In most vibration-based SHM applications based on contact-based sensors, a long-term SHM strategy contains a large volume of measured data with high-dimensional data samples. therefore, the course of dimensionality and Big Data is one of the major challenges in SHM. thanks to developments of satellite sensors and synthetic aperture radar (SAR), it has been possible to exploit their benefits for SHM of civil structures via satellite images as remote sensing. the great advantage of the SAR-based SHM strategy is the possibility of obtaining prior information of civil structures regarding their normal conditions. However, some restrictions cause this process provides a small number of images leading to the problem of small data for the SAR-based SHM strategy. On the other hand, the major challenge in most of the longterm SHM projects is related to variations in their inherent properties resulting from environmental and/or operational variability (EOV). this issue is challenging and will be worse in the SAR-based SHM application when a small number of data is present. therefore, the main objective of this study is to propose effective and efficient multi-stage unsupervised learning methods for addressing the aforementioned challenges. the proposed method contains three main parts including: (i) data augmentation by a Markov Chain Monte Carlo (MCMC) algorithm, (ii) feature normalization for removing the EOV conditions, and (iii) decision-making for pre-collapse prediction via Mahalanobis-squared distance (MSD). the major innovation of this method concentrates on feature normalization, which is based on the concepts of machine learning, unsupervised learning, artificial neural network (ANN). In the proposed method called MCMC-ANN-MSD, an effective iterative hyperparameter selection is proposed to choose the neuron sizes of the hidden layer

关键词： Synthetic aperture radar

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Integrated green-grey-blue system: a bibliometric analysis-based review 5

Integrated green-grey-blue system: a bibliometric analysis-b...

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5th International conference on Green Energy, Environment, and Sustainable Development, GEESD 2024

作者： Jia, Ruilan Fu, Chun Gan, Yuqun School of Infrastructure Engineering Nanchang University Jiangxi Nanchang330038 China Design and Research Institute of Nanchang University Jiangxi Nanchang330038 China School of Public Policy and Management Nanchang University Jiangxi Nanchang330038 China Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Education Nanchang University Jiangxi Nanchang330038 China School of Civil Engineering and Architecture East China Jiaotong University Jiangxi Nanchang330100 China

ISBN: (纸本)9781510683006

the Integrated Green-Grey-Blue System (IGGBS) represents an advanced strategy for sustainable stormwater management, critically enhancing water resource efficiency and urban resilience. this study utilizes the Web of Science Core Database, R language’s Bibliometrix tool, and CiteSpace software to comprehensively review the research developments in IGGBS. the objective is to integrate international experiences and address current challenges and future directions. the findings indicate: (1) International research on IGGBS has shown consistent growth, with notable increases in China from 2020 to 2023, underscoring its significance in the development of sponge cities;(2) the majority of the studies are published in Q1 category journals of the Journal Citation Reports, predominantly authored by scholars from developed nations such as the USA, UK, and Germany, with fewer contributions from Chinese researchers;(3) IGGBS research is intricately linked with ecosystem services, climate change, urbanization, and resilience theory, trending towards more precise indicators and diverse objectives. Furthermore, the study highlights a gap between theoretical research and practical implementation, pointing to a lack of comprehensive exploration of coupling relationships and future uncertainties. It suggests the necessity to enhance evaluation systems, and foster interdisciplinary collaboration and public engagement, closely aligned with policy, to facilitate the broader adoption and management of IGGBS. © 2024 SPIE.

关键词： Climate change

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Metal additive manufacturing in structural engineering: Review, opportunities and outlook 8th

Metal additive manufacturing in structural engineering: Revi...

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8th International conference on Structural engineering, Mechanics and Computation (SEMC)

作者： Gardner, L. Imperial Coll London Dept Civil & Environm Engn London England

ISBN: (纸本)9781003348450;9781032391144

Although still in its infancy, metal Additive Manufacturing (AM) has arrived at construction scale. In this paper, a review of recent developments in metal AM in structural engineering is presented, including the latest research advances, lessons learned from other sectors and applications in practice. Emphasis is placed on Wire-Arc Additive Manufacturing (WAAM) since this is deemed to be the most promising technique for the requirements of the construction sector. Optimization and additive manufacturing go hand in hand, with the latter now enabling the former to be more readily realised in practice. Recent examples of optimized, additively manufactured structural components are presented. Finally, the potential use of WAAM in the strengthening and repair of structures, as well as the economics, sustainability and outlook for WAAM in structural engineering, are presented.

关键词： 3D printers

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Development of a Wearable Sleep Airway optical Monitor 13th

Development of a Wearable Sleep Airway Optical Monitor

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13th International conference on Frontier Computing, FC 2023

作者： Lin, Yen-Tsung Chu, Woei-Chyn Chen, Kuang-Chao Department of Biomedical Engineering National Yang Ming Chiao Tung University Taipei Taiwan School of Medicine China Medical University Taipei Taiwan

ISBN: (纸本)9789819994151

OSA (Obstructive Sleep Apnea) is a condition in which there is repetitive partial or complete collapse of the pharynx during sleep, resulting in blockage of the airway and inadequate respiration. the resultant of syndromes is a leading cause of hypertension, cardiac disease, and sudden cardiac death, affecting up to 200 million people worldwide. current remedies include CPAPs (Continuous Positive Airway Pressure), mouth braces, and surgeries. the most common diagnostic procedure is Drug Induced Sleep Endoscopy (DISE). Taking the above as a subject, the research is designed to not only minimize the risk to the patient, but also to improve diagnostic fidelity to the natural state of sleep. Aim to develop a product with a similar fashion to COVID self-tests, which can be inserted by the patients themselves without either anesthesia or a doctor’s intervention. the design focus on comfort and reliability is driven by rigorous user experience research and anatomical analytics, and is to be worn overnight to monitor and acquire visual verification of obstruction with the most accurate representation of the airway during natural sleep. © 2024, the Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Endoscopy

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Application development of distributed fibre optic sensors for monitoring existing bridges 8th

Application development of distributed fibre optic sensors f...

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8th International conference on Structural engineering, Mechanics and Computation (SEMC)

作者： Novak, B. Stein, F. Dudonu, A. Reinhard, J. Univ Stuttgart Inst Lightweight Struct & Conceptual Design Stuttgart Germany Schoemig Plan Ingn Gesell mbH Kleinostheim Stuttgart Germany

ISBN: (纸本)9781003348450;9781032391144

Concerning the ageing infrastructure and increasing traffic load, the importance of monitoring systems for structural health monitoring of existing bridges and early damage detection is constantly increasing. Due to progress in monitoring methods, recent developments offer new opportunities to monitor bridge structures over the entire geometrical length using distributed fibre optic sensors (DFOS), however, with little experience for practical use on structures outside the laboratory environment. To develop a monitoring system applicable under environmental conditions, different concrete surface applications of DFOS for crack detection and permanent monitoring of existing bridges were evaluated in laboratory tests. In subsequent field tests on a highway bridge, the potential of crack detection and monitoring traffic-induced crack developments using DFOS was successfully demonstrated when exposed to temperature, humidity, and vibrations from traffic.

关键词： Crack detection

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Research on Intelligent Monitoring Terminal of Transmission Line Hidden Target Based on Multi-dimensional optical Information

Research on Intelligent Monitoring Terminal of Transmission ...

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IEEE Information Technology and Mechatronics engineering conference (ITOEC)

作者： Yuanlong Peng Jiaqi Shi Jianing Niu Mingyang Shi Longchuan Yan Zhiyu Chen Yan Li Danhua Cao State Grid Information and Telecommunication Branch Beijing China School of Optical and Electronic Information Huazhong University of Science and Technology Hubei China

ISBN: (数字)9798331529482

ISBN: (纸本)9798331529499

the construction and maintenance of transmission lines are critical to ensuring national energy security. current methods for detecting hidden targets in transmission lines involve uploading massive amounts of images from various monitoring points to a centralized video platform and then carrying out the algorithmic recognition, which demands an extremely high computational load on the platform. therefore, designing edge-intelligent algorithm deployments at the monitoring terminals can effectively distribute the load, reduce the redundancy of uploaded images, and lower the computational burden and power consumption of the central platform. To ensure the safe and stable operation of transmission lines, this paper proposed a novel intelligent monitoring terminal based on multi-dimensional optical information fusion. TensorRT inference optimization engine, CUDA programming model and parameter quantization method are used to achieve edge deployment and optimization of hidden target detection algorithm on the terminal. Results show that the intelligent surveillance terminal effectively balances the contradictory relationship between model accuracy, computational ability and power consumption, and ultimately improves the inference speed while maintaining the accuracy.

关键词： optical polarization Power transmission lines Power demand Quantization (signal) optical design Computational modeling Programming optical imaging Power grids Optimization

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