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design of the Electrical Performance Test System for AC and DC Relays 8

Design of the Electrical Performance Test System for AC and ...

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8th International conference on Energy Materials and Electrical engineering, ICEMEE 2022

作者： Wang, Biao Peng, Jia Yan, Yu Wen, Chao Li, Xiaowu Xiong, Yifan State Grid Hunan UHV Substation Company China State Grid Hunan Electric Power Co. Ltd. 410004 China

ISBN: (纸本)9781510663220

In alternating current (AC) and direct current (DC) control systems, relays witnessed wide applications in automatic control, communication, remote control, telemetry, power electronic equipment, and mechatronics. the duration of its operation has a great impact on the reliability of the entire equipment. this paper summarizes the current common influencing factors of the electrical performance of relays and the energy consumption and current limiting methods of AC and DC arc breaking. On this basis, a detailed analysis is made in terms of the hardware and software design of the electrical performance test system for AC/DC relays, in the hope of searching for some rules of relay design, so as to provide help for the development of relays in the future. © 2023 SPIE.

关键词： Remote control

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Development of on-machine surface profile measuring instrument based on white light interference principle 8

Development of on-machine surface profile measuring instrume...

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8th Asia Pacific conference on Optics Manufacture, APCOM 2023 and 3rd International Forum of Young Scientists on Advanced optical Manufacturing, YSAOM 2023

作者： Huang, Yuejia Li, Duo Wang, Bo Centre for Precision Engineering Harbin Institute of Technology China

ISBN: (纸本)9781510672673

For most of the current white light interferometer mechanical structure are vertical structure and the size of the inspected parts have limitations, this paper mainly uses white light vertical scanning measurement technology to develop the measurement system for in-situ measurement of ultra-precision machined parts surface three-dimensional topography, white light interferometer mechanical structure design and machine tool integration, to carry out the design of the mechanical structure of the white light interferometer and the integration of the machine tool, and the completion of the measurement system to build a physical example of the system to test the verification of the reliability of the system. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Surface roughness

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theory of two-component zoom systems

Theory of two-component zoom systems

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current developments in optical design and optical engineering 1991

作者： Oskotsky, Mark FLIR Systems Inc. PortlandOR97224 United States

Two-component zoom systems are a basic part of all zoom systems. the first zoom systems appeared at the end of the 19th century in Germany. Dunouer1 has shown the possibility of the creating two-component zoom converters with a definite magnification range and the appropriate correlation between the optical powers of the components. After Dunouer several types of the two-component zoom objective lenses have been designed.2-5 Typically, they had small magnification range (less than 2X) and were more complex than was necessary. In the 1970's designers began to pay more attention to the creation of twocomponent zoom projection systems.6,7 Most recently, special telecinema zoom projection systems have been created. An optical telecinema system consists of a zoom projection system and a prism splitter to split the beam into a three colour channels. Its purpose is to project 8,16 and 35mm movies in a Television.8,9 Such a zoom system is supposed to have telecentric chief rays in image space and a long distance from the last surface to the image. the creation of new zoom systems has to be founded on the general theory of first and third order design to find the optimum parameters of the system. © 1991 SPIE. All rights reserved.

关键词： optical correlation

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Window-based energy-aware model for real-time detection and reporting of progressive development of cardiac atrial fibrillation in wearable computing

Window-based energy-aware model for real-time detection and ...

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8th International conference on High-Capacity optical Networks and Emerging Technologies, HONET 2011

作者： Bouhenguel, Redjem Mahgoub, Imad Ilyas, Mohammad Department of Computer Electrical Engineering and Computer Science Florida Atlantic University Boca Raton FL United States

ISBN: (纸本)9781457711695

current portable healthcare monitoring systems are small, battery-operated electrocardiograph devices that are used to record the heart's rhythm and activity. However they are not energy-aware and fall short on delivering real-time early detection and reporting of progressive development of cardiac atrial fibrillation (A-Fib). Previous work by the same authors proposes adopting an incidence-based energy-aware model that incorporates a real-time detection algorithm for the onset of A-Fib using an A-Fib incidence rate in a wearable computing device during a 24 hour period. the results of the adopted incidence-based energy-aware model show an improvement of 38.2% when compared to the energy consumed by current telemetry energy model. this paper extends the previous design to the paroxysmal phase of A-Fib within a personalized A-Fib prevalence window lasting up to 7 days in order to monitor and detect the progressive development of A-Fib in wearable computing devices. the results from the new window-based energy-aware model show that the proposed energy model may potentially consume 89.7% less energy than the telemetry energy model. the design shows promising results in further meeting the energy needs for real-time detection and reporting of progressive development of cardiac A-Fib in wearable computing devices. © 2011 IEEE.

关键词： Heart

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design of Ultrashort throw Lenses with Catadioptric Relays for Curved Screens 22

Design of Ultrashort Throw Lenses with Catadioptric Relays f...

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conference on current developments in Lens design and optical engineering XXII

作者： Nishikawa, Jun Nishiyama, Mariko Sony Grp Corp R&D Ctr Atsugi TEC 4-14-1 Asahi Cho Atsugi Kanagawa 2430014 Japan

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

An ultrashort throw lens with a catadioptric relay (USTCR) for curved screens has a half-field angle greater than 110 degrees. the angle of the principal ray incident on the aspherical mirror increases according to the height of the ray emitted from the object surface. A larger field angle leads to larger sag amount. thus, the degree of difficulty in precision machining increases. In this study, we examined how the tangent of the concave mirror surface can be reduced such that it can be manufactured while maintaining the half-field angle and its optical performance. It was found that the interval between imaging points reaching the screen can be made constant by suppressing the change in the principal ray incident on the concave mirror by +1- 1 degrees or less, particularly in the area of a half-field angle of 90 degrees or more, and making the change in the tangent of the concave mirror surface constant. As an index of distortion, we show that the perimeter ratio (Pr) of the frame length, which was equally divided by 5 x5 in the screen, improved from 0.26 to 0.73. As one possible application, a projection system that can be realized with only 8 projectors is proposed, as opposed to conventional systems consisting of approximately 20 projectors in omni-directional projection systems.

关键词： ultrashort throw lens aspheric mirror sag amount concave mirror catadioptric relay lens lens design curved screen omni-directional projection system

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design of an interferometric system for piston measurements in segmented primary mirrors

Design of an interferometric system for piston measurements ...

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conference on current developments in Lens design and optical Systems engineering

作者： Arasa, J Laguarta, F Pizarro, C Tomàs, N Pintó, A UPC Ctr Dev Sensors Instrumentat & Syst CD6 E-08222 Terrassa Spain

ISBN: (纸本)0819437387

Recently, telescopes with segmented primary mirrors are becoming increasingly popular due to their ability of achieving large apertures without the inconveniences caused by the fabrication and handling of monolithic surfaces with 8m (or over) in diameter. the difference in position of each pair of adjacent segments along the local normal of their interface (called piston hereafter), however, needs to be precisely measured in order to provide a diffraction-limited image. If a system yielding the nanometric accuracy required in piston measurements worked in daylight hours, the resultant saving in observation time would be an important advance on a majority of the state-of-the-art piston measurement systems. An interferometric piston measurement instrument accomplishing such objectives has been designed starting from the usual Michelson configuration at the CD6 (Terrassa, Spain), and its final test has been carried out in the test workbench of the Institute de Astrofisica de Canarias (IAC, Canary Islands, Spain). Its optical layout relies on projecting the reference arm of the interferometer onto one of the segments of the pair considered, along the direction of the local normal to the surface while the measurement arm is projected onto the interface which divides the pair of segments considered. the field of view and its illumination are calculated to be equivalent in both segments. the lateral shift of the fringes in both interferograms determines the piston error present. A combination of monochromatic and white light is used, in order to remove the lambda /2 phase ambiguities present in piston measurements without losing the required resolution in the measurement. In this paper, the optical design of this interferometric piston measurement instrument will be presented. the particular configuration used in the interferometer, the implementation of an imaging system allowing to see both the interface of the segments and the interference fringes, the effect of the ext

关键词： optical design white light interferometer segmented primary mirrors telescopes

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Advanced techniques for computer-controlled polishing

Advanced techniques for computer-controlled polishing

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conference on current developments in Lens design and optical engineering IX

作者： Schinhaerl, Markus Stamp, Richard Pitschke, Elmar Rascher, Rolf Smith, Lyndon Smith, Gordon Geiss, Andreas Sperber, Peter Univ Appl Sci Deggendorf Edlmairstr 6 8 D-94469 Deggendorf Germany Univ West England Bristol Avon England

ISBN: (纸本)9780819472809

Computer-controlled polishing has introduced determinism into the finishing of high-quality surfaces, for example those used as optical interfaces. Computer-controlled polishing may overcome many of the disadvantages of traditional polishing techniques. the polishing procedure is computed in terms of the surface error-profile and the material removal characteristic of the polishing tool, the influence function. Determinism and predictability not only enable more economical manufacture but also facilitate considerably increased processing accuracy. However, there are several disadvantages that serve to limit the capabilities of computer-controlled polishing, many of these are considered to be issues associated with determination of the influence function. Magnetorheological finishing has been investigated and various new techniques and approaches that dramatically enhance the potential as well as the economics of computer-controlled polishing have been developed and verified experimentally. Recent developments and advancements in computer-controlled polishing are discussed. the generic results of this research may be used in a wide variety of alternative applications in which controlled material removal is employed to achieve a desired surface specification, ranging from surface treatment processes in technical disciplines, to manipulation of biological surface textures in medical technologies.

关键词： Computer-controlled polishing CCP Influence function Dwell time method Magnetorheological finishing MRF

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design of traffic light control system based on fuzzy control 8

Design of traffic light control system based on fuzzy contro...

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8th International conference on Traffic engineering and Transportation System, ICTETS 2024

作者： Li, Chao Fu, Liyou School of Business Shanghai Dianji University Shanghai201306 China

ISBN: (数字)9781510686298

ISBN: (纸本)9781510686281

In order to better build a harmonious and low-carbon social environment, the red and green light timing of the intersection is optimized. In this paper, a traffic light control system based on fuzzy control is designed. Specifically, the maximum queue length of the current green light phase of the intersection and the traffic flow of the next green light passing phase are taken as inputs to the fuzzy controller. the fuzzy control rule base is set according to the experience of relevant experts and traffic controllers to output the green light extension schedule for the current green light phase. © 2024 SPIE.

关键词： Fuzzy control

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Research on the application of domestic high-current IGBT power to the inverter in the national pipeline network 8

Research on the application of domestic high-current IGBT po...

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8th International conference on Energy Materials and Electrical engineering, ICEMEE 2022

作者： Zhang, Lidong National Pipeline Group Western Pipeline Co. Ltd. Xinjiang Urumqi830013 China

ISBN: (纸本)9781510663220

Domestic IGBT power units have type test reports, factory test reports and records, product design instructions, and certificates issued by nationally recognized institutions. the main technical indicators of the domestic IGBT power unit and the frequency conversion device meet the requirements of the relevant national standards and test outlines, and have reached the design goal of the 25MVA domestic IGBT power unit. So far, it has been running smoothly for 6500 hours. © 2023 SPIE.

关键词： Insulated gate bipolar transistors (IGBT)

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Research on properties of an infrared imaging diffractive element 15

Research on properties of an infrared imaging diffractive el...

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conference on current developments in Lens design and optical engineering XV

作者： Rachon, M. Wegrzynska, K. Doch, M. Kolodziejczyk, A. Siemion, A. Suszek, J. Kakarenko, K. Sypek, M. Warsaw Univ Technol Fac Phys PL-00662 Warsaw Poland

ISBN: (纸本)9781628412192

Novel thermovision imaging systems having high efficiency require very sophisticated optical components. this paper describes the diffractive optical elements which are designed for the wavelengths between 8 and 14 mu m for the application in the FLIR cameras. In the current paper the authors present phase only diffractive elements manufactured in the etched gallium arsenide. Due to the simplicity of the manufacturing process only binary phase elements were designed and manufactured. Such solution exhibits huge chromatic aberration. Moreover, the performance of such elements is rather poor, which is caused by two factors. the first one is the limited diffraction efficiency (c.a. 40%) of binary phase structures. the second problem lies in the Fresnel losses coming from the reflection from the two surfaces (around 50%). Performance of this structures is limited and the imaging contrast is poor. However, such structures can be used for relatively cheap practical testing of the new ideas. For example this solution is sufficient for point spread function (PSF) measurements. Different diffractive elements were compared. the first one was the equivalent of the lens designed on the basis of the paraxial approximation. For the second designing process, the non-paraxial approach was used. It was due to the fact that f/# was equal to 1. For the non-paraxial designing the focal spot is smaller and better focused. Moreover, binary phase structures suffer from huge chromatic aberrations. Finally, it is presented that non-paraxially designed optical element imaging with extended depth of focus (light-sword) can suppress chromatic aberration and therefore it creates the image not only in the image plane.

关键词： infrared diffractive optics extended depth of focus Light Sword optical Element

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