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Space optical instruments design optimisation thanks to CMOS image sensor technology 6

Space optical instruments design optimisation thanks to CMOS...

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6th International conference on Space Optics, ICSO 2006

作者： Saint-Pe, Olivier Tulet, Michel Davancens, Robert Larnaudie, Franck Bréart De Boisanger, Michel Magnan, Pierre Martin-Gonthier, Philippe Corbière, Franck Estribeau, Magali EADS Astrium 31 Avenue des Cosmonautes Toulouse Cédex 431402 France SUPAERO-CIMI 10 Avenue Edouard Belin Toulouse Cédex31055 France

ISBN: (纸本)9781510616233

Today, both CCD and CMOS sensors can be envisaged for nearly all visible sensors and instruments designed for space needs. Indeed, detectors built with both technologies allow excellent electro-optics (EO) performances to be reached, the selection of the most adequate device being driven by their functional and technological features and limits. the first part of the paper shortly recalls how far CMOS Image Sensors (CIS) EO performances have been improved these last years. the second part reviews the advantages of CMOS technology for space applications, illustrated by examples of CIS developments performed by EADS Astrium and Supaéro/CIMI for current and short term coming space programs. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Space applications

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Simulation Analysis of thunderstorm Activity Law of Wind Farm Station Based on Cumulative Probability Fitting of Lightning current Amplitude 8

Simulation Analysis of Thunderstorm Activity Law of Wind Far...

引用

8th International conference on Energy System, Electricity, and Power, ESEP 2023

作者： Zhang, Mingxu Zhang, Xiaodong Qi, Nan Chen, Ge Mengdong Concord New Energy Co. Ltd. Inner Mongolia Autonomous Region Tongliao City028000 China

ISBN: (数字)9781510679801

ISBN: (纸本)9781510679795

Using Maxwell 3D to simulate the measured values of wind farms is susceptible to distortion, resulting in mismatches between the analyzed thunderstorm field strengths of different main towers and the actual thunderstorm field strengths. therefore, it is necessary to design a new simulation and analysis method for thunderstorm activity patterns in wind farms. that is, to correct the thunderstorm data of the atmospheric electric field instrument, combined with the fitting of lightning current amplitude and lightning probability, to establish a simulation model for the thunderstorm activity law of the wind farm, and complete the simulation analysis of the thunderstorm activity law of the wind farm station. the example analysis results show that the thunderstorm electric field strength of different main towers analyzed is in good agreement with the actual thunderstorm electric field strength, which has good analysis results, reliability, and certain application value. It has made a certain contribution to reducing the thunderstorm risk of wind farm stations. © 2024 SPIE.

关键词： thunderstorms

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Multi-physics modelling for microelectronics and microsystems - current capabilities and future challenges

Multi-physics modelling for microelectronics and microsystem...

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8th International conference on thermal, Mechanical and Multi-Physics Simulation and Experiments in Micro-Electronics and Micro-Systems

作者： Bailey, C. Lu, H. Stoyanov, S. Hughes, M. Yin, C. Gwyer, D. Univ Greenwich Comp & Math Sci London SE10 9LS England

ISBN: (纸本)9781424411054

At present the vast majority of Computer-Aided-engineering (CAE) analysis calculations for microelectronic and microsystems technologies are undertaken using software tools that focus on single aspects of the physics taking place. For example, the design engineer may use one code to predict the airflow and thermal behavior of an electronic package, then another code to predict the stress in solder joints, and then yet another code to predict electromagnetic radiation throughout the system. the reason for this focus of mesh-based codes on separate parts of the governing physics is essentially due to the numerical technologies used to solve the partial differential equations, combined with the subsequent heritage structure in the software codes. Using different software tools, that each requires model build and meshing, leads to a large investment in time, and hence cost, to undertake each of the simulations. During the last ten years there has been significant developments in the modelling community around multi-physics analysis. these developments are being followed by many of the code vendors who are now providing multi-physics capabilities in their software tools. this paper illustrates current capabilities of multi-physics technology and highlights some of the future challenges.

关键词： Microelectronics

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Numerical Investigation on the Effect of Vertically Oriented CPC on Spillage Loses in Evacuated Tube-Based Power Tower Receiver 7th

Numerical Investigation on the Effect of Vertically Oriented...

引用

7th International conference on Production, Energy and Reliability, ICPER 2020

作者： Hussain, Ibrahim A. Gilani, Syed I. Al-Kayiem, Hussain H. Abdullah, Mohamad Z. Department of Mechanical Engineering Universiti Teknologi PETRONAS Seri Iskandar Malaysia Department of Mechanical Engineering Ahmadu Bello University Zaria Nigeria

ISBN: (纸本)9789811919381

the existing design of the evacuated tube-based solar power tower (ET-SPT) receiver suffers greatly from optical losses due to optical spillage;where some reflected radiation escape through the gaps between the receiver tubes, and some miss the absorber due to difference in the diameters of the glass cover and the metallic absorber *** is aimed in the current work to minimize the concentrated solar power spillage losses at the *** of integrating compound parabolic concentrator in the ET-SPT receiver design was investigated.A proposed methodology of a W-shape cavity, compound parabolic concentrator (CPC) coupled with an evacuated tubular absorber, with 40 and 70 mm tube and glass diameters, respectively was designed and numerically analysed for optical performance using ray tracing software *** considered in the investigation of the vertically oriented receiver design (CPC + Vacuum tube) comprise of glass tube and absorber diameters, distance between the tubes, and the angular distance between the farthest heliostats to the east and the west of the *** results have shown that flux on target (receiver) with CPC is about 3 times more than that of ETR without *** improvement in the receiver optical performance is achieved by minimizing the amount of spillage loses from 40 to 11% with an average receiver optical efficiency of 75%. © 2023, Institute of Technology PETRONAS Sdn Bhd.

关键词： Solar energy

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Application of Fuzzy PI Algorithm in Voltage-mode Pulse Width Modulation Rectifier 8

Application of Fuzzy PI Algorithm in Voltage-mode Pulse Widt...

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8th International conference on Electromechanical Control Technology and Transportation, ICECTT 2023

作者： Cui, Yunlong Gan, Dengcheng School of Electronic and Information Engineering Chongqing Three Gorges University Chongqing China School of Electronic and Information Engineering Yangtze Normal University Chongqing China

ISBN: (纸本)9781510668331

It is difficult to realize the three-phase voltage PWM rectifier with the traditional PI control strategy, and with the increasing requirements for the performance of the rectifier, the traditional PI control in performance has been difficult to achieve the desired effect, so this paper proposes a new double closed-loop control strategy. the original voltage outer loop PI control is changed to fuzzy PI control while the inner loop current control still uses feedforward decoupling control strategy. Compared with the traditional PI control method, the proposed method not only realizes the self-tuning of PI parameters, but also makes the system have better response performance, higher stability and robustness. Matlab/Simulink toolbox is used to build a rectifier simulation model based on fuzzy PI control, and then the design method is verified by simulation experiments. © 2023 SPIE.

关键词： Electric rectifiers

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the design and Improvement of High Voltage Side Circuit in Electronic current Transformer

The Design and Improvement of High Voltage Side Circuit in E...

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International conference on Properties and Applications of Properties and Applications of Dielectric Materials

作者： Z. Qian N. Tan J. E. Lu School of Instrument Science & Optoelectronic Engineering Beihang University Beijing China

As well known, electronic transformer has the advantages of wide dynamic range, small size and adaptability for the development of digitization. In this paper, a design method of the high voltage side circuit in an active electronic current transformer is introduced at first. the circuit obtains the output signal of sensor and converts it into optical signal; thus the fiber would be utilized to transfer it to the low voltage side. And then, the test combined high-voltage side circuit with low-voltage side circuit is carried out, circuit design problems could be found and solved during this test. At last, some related technologies are introduced such as embedded system and testability, and the high voltage side circuit is redesigned considering the improvement of reliability, intelligent degree and the reduction of power consumption

关键词： current transformers Circuit testing optical fiber sensors optical sensors Power system reliability Dynamic range design methodology optical fiber testing Low voltage Circuit synthesis

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A novel design of control circuit in neural stimulator for optic nerve prostheses

A novel design of control circuit in neural stimulator for o...

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International conference on Signal Processing Proceedings (ICSP)

作者： Ying Zhao Jia Wang Qiushi Ren Xinyu Chai Biomedical Engineering Department Shanghai Jiaotong University Shanghai China

More recent studies show that electrical micro-stimulation of the retina or cortex produces visual sensations in blinds subjects. However, with current electrode array technologies, it is nearly impossible to cover entire visual field by electrically stimulating the retina or visual cortex. In the visual pathway, by stimulating optic nerve, the entire visual filed is represented in such a relatively small area. According to physiological experiment results, we design a kind of implantable neural stimulator based on stimulating optic nerve to generate visual perception. the control circuit is designed to control 64 electrodes, offer single pulse or multiple pulses sequence which are variable range such as from 1 muA to 2.048 mA current amplitudes, from 21 mu5 to 400 mus duration, from 0 to 350 Hz frequency

关键词： optical design optical control Circuits Stimulated emission Neural prosthesis optical sensors Retina Electrodes optical variables control Electric variables control

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Chemical Imaging System: current status and challenges

Chemical Imaging System: Current status and challenges

引用

conference on Algorithms for Multispectral, Hyperspectral, and Ultraspectral Imagery VII

作者： Ifarraguerri, A Jensen, JO USA SBCCOM Edgewood Chem Biol Ctr AMSSB RRT DP Aberdeen Proving Ground MD 21010 USA

ISBN: (纸本)0819440760

the Chemical Imaging System (CIS) is a small, high-speed long-wave infrared (8 - 12 mum) imaging spectrometer which is currently under development by the United States Army. the fielded system will operate at 360 scans per second with a large format focal-plane-array. the CIS, which is currently at the exploratory development stage, is scheduled for transition to engineering development in 2005. currently, the CIS uses the TurboFT FTS in conjunction with a 16-pixel direct-wired HgCdTe detector array. the TurboFT spectrometer provides high-speed operation in a small, lightweight package. In parallel to the hardware developments an algorithm and software development effort is underway to address some unique features of the CIS. the TurboFT-based system requires a non-uniform sampling Fourier transform algorithm in order to preserve signal fidelity. Also, the availability of multiple pixels can be exploited in order to improve the interference suppression capabilities of the system by allowing the detection and identification algorithm to adapt its parameters to the changing background. Due to the enormous amount of data generated, the signal processing must proceed at very high rate. High-speed computers operating with a parallel architecture are required to process the data in real time. this paper describes the current CIS "bread box" system. It includes some field measurement results followed by a discussion of the issues and challenges associated with meeting the design goals set for the program.

关键词： Chemical Imaging System imaging spectrometer TurboFT vapor detection

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Short term PV power generation prediction based on wavelet transform and LSTM 8

Short term PV power generation prediction based on wavelet t...

引用

8th International conference on Energy System, Electricity, and Power, ESEP 2023

作者： Zhao, Ping Tan, Wei Cao, Shuanghe Liu, Yong Power Construction Corporation of China Guizhou Electric Power Design & Research Institute Company. Ltd. Guiyang550008 China

ISBN: (数字)9781510679801

ISBN: (纸本)9781510679795

Accurate short-term photovoltaic (PV) power generation prediction is helpful for the allocation and management of power grid resources, and is of great significance for the stable operation and economic benefits of the power *** historical data of PV power generation systems has characteristics such as volatility, randomness, time series, and certain periodicity. Traditional prediction methods cannot effectively mine and utilize the deep-seated features of the data, so they can no longer meet the current demand for high-precision *** article proposes a WT-LSTM PV short-term power generation prediction method. Firstly, the historical time series data of the PV electric field is decomposed into high-frequency and low-frequency components through wavelet transform to improve the feature expression ability of the data. then, a Long Short Term Memory (LSTM) network is used to predict each component, addressing the negative impact of data volatility and randomness on the prediction results caused by a single LSTM prediction ***, the final PV power generation prediction result is reconstructed by inverse wavelet transform. © 2024 SPIE.

关键词： Forecasting

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developments for the injection kicker vacuum system of the HESR at FAIR 8

Developments for the injection kicker vacuum system of the H...

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8th International Particle Accelerator conference, IPAC 2017

作者： Zahariev, F. Bai, M. Bongers, N. Chaumet, P. Esser, F.M. Gebel, R. Glückler, H. Hamzic, S. Jagdfeld, H. Lesmeister, W. Laatsch, B. Retzlaff, M. Natour, G. Semke, L. Reiferscheidt, L. Tölle, R. Central Institute of Engineering Electronics and Analytics - Engineering and Technology ZEA-1 Institute for Nuclear Physics IKP-4 Forschungszentrum Jülich GmbH Germany

ISBN: (纸本)9783954501823

IKP-4 of Forschungszentrum Jülich (FZJ) has taken the leadership of a consortium being responsible for the design and manufacturing of the High-Energy Storage Ring (HESR) going to be part of FAIR. the HESR is designed both for antiprotons and for heavy ion experiments. the injection kicker system of the HESR is located 17 m downstream of the injection septum. 4 ferrite magnets (in vacuum, 40 kV, 4 kA) will deflect the incoming beam by 6.4 mrad onto the path of the circulating particles. the vacuum system comprising chambers, suspensions, alignment, bakeout system, and lifting mechanism for the HV heads is in the responsibility of ZEA-1. All current bearing parts (magnets, feedthroughs, pulsers) are in the responsibility of the company SigmaPhi, Vannes, France. As well as the magnets, the adjustment frames will be installed inside the tanks. Due to the large surface of the magnets, the injection kicker system will be very sensitive with regard to the achievable vacuum quality that is expected to be in the order of 10-11 mbar or better. thus a sufficient vacuum pumping system is designed as well as a heating system to heat the whole system up to 250° C. In order to investigate the achievable end pressure and to develop the heating system a test facility was constructed. Both the actual vacuum layout of the injection kicker system for the HESR as well as layout of the test facility is described and the first experimental test results are briefly presented. © 2017 CC-BY-3.0 and by the respective authors

关键词： Heavy ions

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