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

共 293 条记录，以下是51-60 订阅

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optical design of SHASM: Segmented hexagon array solar mirror

Optical design of SHASM: Segmented hexagon array solar mirro...

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conference on current developments in Lens design and optical Systems engineering

作者： Huegele, VB NASA George C Marshall Space Flight Ctr SOMTC Huntsville AL 35812 USA

ISBN: (纸本)0819437387

A segmented array of mirrors was designed for a solar concentrator test stand at MSFC for firing solar thermal propulsion engines. the 144 mirrors each have a spherical surface to approximate a parabolic concentrator when combined into the entire 17-foot diameter array. the mirror segments are aluminum hexagons that had the surface diamond turned and quartz coated. the array focuses sunlight reflected from a heliostat to a 4 inch diameter spot containing 8 kilowatts of power at the 15 foot focal point. the derivation of the surface figure for the respective mirror elements is shown. the alignment process of the array is discussed and test results of the system's performance are given.

关键词： segmented mirror array spherical approximation solar thermal propulsion solar power

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design of lens hoods for the "Lira-B" space telescope 19

Design of lens hoods for the "Lira-B" space telescope

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19th conference on current developments in Lens design and optical engineering

作者： Muratov, Artem Olyunin, Vyacheslav Bacholdin, Alexey Voznesenskaya, Anna ITMO Univ 49 Kronverksky Av St Petersburg 197101 Russia

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

the space investigation project "Lira-B" is purposed to perform a high-precision multicolor photometric all-sky survey of objects from 3 to 16 m. this investigation concludes in multiple photometric measurements in ten spectral bands from 200 to 1000 nm. Such telescope systems should provide maximum light gathering and meet stray light requirements. the main goal of the given work is optical design of the telescope system with lens hoods protecting against the parasitic illumination. Analysis of impact of the lens hoods' surface structure and coatings on the image quality is performed and ways to reduce the stray light in the system. the modeling is carried out using Zemax OpticStudio software in the non-sequential mode.

关键词： Lira-B Zemax lens hood telescopic system

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High magnification zoom lenses for 3-5 μm applications

High magnification zoom lenses for 3-5 μm applications

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conference on current developments in optical design and engineering VII

作者： Sinclair, RL Wescam Inc Flamborough ON L9H Canada

ISBN: (纸本)0819428841

Over the past twenty years numerous papers and patents have reported on the design of infrared zoom lenses for a variety of civilian and military applications. the vast majority of these lenses have been afocal 8-12 mu m zoom lenses with magnification ratios of five to twenty. With the advancement of 3-5 mu m staring focal plane array technology a growing demand has emerged for a compact imaging 3-5 mu m zoom lens. To meet this demand a variety of such zoom lenses have been designed which support image formats of over 10 mm diagonal. In this paper the preliminary design of a high magnification 3-5 mu m zoom lens is described. Infrared system modeling, detailed lens performance and manufacturing issues are reviewed.

关键词： infrared lens zoom lenses diffractive optical elements lens design

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current and next-generation passive optical networks monitoring solution

Current and next-generation passive optical networks monitor...

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

作者： Esmail, Maged Abdullah Fathallah, Habib King Saud University Riyadh Saudi Arabia Electrical and Computer Engineering Department Laval University QC Canada

ISBN: (纸本)9781457711695

In order to enable new services that require high data rates over longer distances, the optical fiber substitutes the copper cable step by step in the access network area. Time division multiplexed Passive optical network (TDM-PON) is a fast emerging architecture that uses passive components only between the customer and the central office. PON operators need a monitoring system for the physical layer to guarantee high service quality. this monitoring system is necessary during the fiber installation, final testing, regular operation of the network, and for fault localization. In this paper, we present our monitoring system based on optical coding for PON maintenance. this system has almost all the monitoring features required by a network operator. We explained the design and the principle operation of the technique. Moreover, we presents a management and protection solution for long-reach PON networks. Our system design achieves high reliability performance with almost half the cost if full network protection is used. © 2011 IEEE.

关键词： Monitoring

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Review of the design and manufacturing procedures for large format holographic optical element

Review of the design and manufacturing procedures for large ...

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conference on current developments in optical design and engineering VII

作者： Stojanoff, CG Schütte, H Schulat, J Fröning, P Aachen Tech Univ Rhein Westfal TH Aachen Lehr & Forsch Gebiet Hochtemp Thermodynam D-52056 Aachen Germany

ISBN: (纸本)0819428841

the objective of this research program was the development of the technology for the industrial manufacturing of HOEs for technical applications such as: holographic solar concentrators for utilization in photovoltaic energy conversion and solar photochemistry, and integrated holographic stacks for daylighting, glazing and shading in buildings. Some of the fabricated HOEs exhibit apertures in the order of 8 square meters. the accomplished technology facilitates the continuous fabrication of the holographic films on glass or plastic substrata. the standard holographic material we use for the fabrication of HOEs is dichromated gelatin (DCG) on glass or plastic film (PET) substrata the dichromated gelatin layer could be prepared with different compositions to accommodate the desired exposures and chemical processing procedures. At present we manufacture holographic plates on glass substrata in sizes of up to 1 meter square. the holographic film on plastic substratum is 20 cm wide and could be made in lengths of hundredths of meters. the inexpensive fabrication of such large formats is attained by automation of the entire process: film manufacturing, hologram copying, development and test. We present in this paper the design considerations and the developed manufacturing procedures. these comprise the fabrication of large format reflective holograms for concentrating mirrors and the copying of transmissive holograms, such as gratings and lenses, using in-plane contact copying in checkerboard arrangement or rotating drum continuous copying onto an endless plastic film.

关键词： holography HOE large aperture optics fabrication procedures optical materials solar concentrators

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design and fabrication of low-cost thermal imaging optics using precision chalcogenide glass molding

Design and fabrication of low-cost thermal imaging optics us...

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conference on current developments in Lens design and optical engineering IX

作者： Curatu, George LightPath Technol Orlando FL 32826 USA

ISBN: (纸本)9780819472809

Aspheric and diffractive surfaces in infrared materials are traditionally fabricated by single point diamond turning, which is a high-cost, low-throughput process, not suitable for low-cost, high-volume applications. Precision molding of chalcogenide glasses is a novel process we developed to allow the efficient fabrication of quality infrared optics in large volumes. In this paper we present the advantages and particularities of designing thermal imaging lenses for high-volume applications using precision molded chalcogenide glasses. As an example, we present a compact 19 mm F/1.1 infrared lens design for a 320 x 240 uncooled detector array operating from 8 to 14 microns. the excellent image quality and transmission of tested prototypes prove that precision molding of chalcogenide glasses is an ideal optical fabrication technology for the high-volume production of infrared optics.

关键词： infrared lens design thermal imaging precision glass molding chalcogenide glasses athermal design diffractive optics

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Operation Research Tools and Methodology for the design and Provisioning of Survivable optical Networks

Operation Research Tools and Methodology for the Design and ...

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17th International conference on optical Networking design and Modeling (ONDM)

作者： Jaumard, Brigitte Concordia Univ Comp Sci & Software Engn Dept Montreal PQ H3G 1M8 Canada

ISBN: (纸本)9781479904914

While the design and the provisioning of survivable optical networks have already been studied for a long time, networks across the world are still experiencing a phenomenal growth in data traffic, leading to more complex design and provisioning problems. Network architectures are changing rapidly to meet the new end-user requirements, with many new technovirtual developments and new economical/environmental concerns such as, e. g., network virtualization, anycast routing, elastic networking, energy minimization. While operational research methods have made significant progress over the last 20 years, not much has been done in order to use the full potential of these developments in managing more efficiently communication networks, while, in other areas of applications, they have been used to solve efficiently very large/huge scale optimization problems, e. g., in the transport industry or in financial engineering or in industrial location. this paper gives an overview of some of the developments in solving some optimization problems arising in the design of optical networks or grids. In terms of optimization techniques, we will focus on decomposition techniques, and will discuss their recent success for the protection of optical networks, and of virtual networks built upon optical networks/grids.

关键词： Fiber optic networks provisioning Research Tools Traffic data

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design of an adaptive Fresnel lens using design thinking methodology and cost analysis 19

Design of an adaptive Fresnel lens using design thinking met...

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19th conference on current developments in Lens design and optical engineering

作者： Santiago Alvarado, Agustin Cruz Felix, Angel S. Santiago Gomez, Stephanie L. Ruiz Zavala, Soledad Osorio Garcia, Adelita Iturbide Jimenez, Fernando Univ Tecnol Mixteca Carretera Acatlima Km 2-5 Huajuapan De Leon 69000 Oaxaca Mexico

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

the main characteristic of adaptive lenses is to change their shape, and consequently their focal length, by modifying their physical parameters. On the other hand, Fresnel lenses have such features as large aperture, short focal length, they are slim and reduced in size. these kind of lenses have become very popular due to their applications, such as in compound eyes, optical communication systems, photolithography, imaging systems, etc. Nowadays, several kinds of tunable lenses exist such as those made with dielectric materials, lenses that change their focal length by varying the refractive index of the material, liquid lenses composed by elastic membranes and solid elastic lenses. In this work, we present the design, simulation of the mechanical behavior using Finite Element Method (FEM) and cost analysis of an Adaptive Fresnel Lens made of an elastic material, together with a mechanical mounting system. Our study considered the use of design thinking methodology to obtain the best optical design at minimal cost. Analysis, results and future applications are presented.

关键词： Adaptive Fresnel lens design thinking optical design

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design of ergonomic handpieces for a CO₂ laser system for surgical and cosmetological applications 19

Design of ergonomic handpieces for a CO<sub>2</sub> laser sy...

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19th conference on current developments in Lens design and optical engineering

作者： Zavatskaia, Kseniia Voznesenskaya, Anna ITMO Univ Dept Appl & Comp Opt St Petersburg Russia

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

the CO2 laser systems are widely used for different specialised surgery types and cosmetological procedures. the market is filled with various offers regarding the systems, however, every manufacturer supplies a very limited range of handpieces with the equipment. thus, the work of surgeon or a medical worker is complicated by the discrepancy of a handpiece with the ergonomic/ technical requirements for a specific procedure. It may result in negative consequences of the procedure itself or a choice not in favor of laser technologies. the work presents the design of optical system and construction of specialised handpieces for CO2 laser system based on the discussion with medical workers of several hospitals that directly interact with the equipment and the technical requirements of medical procedures.

关键词： CO2 laser handpiece laser surgery optical design

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Study on Magnetic Field Interference Characteristics of Difference Magneto-optical current Transformer 8

Study on Magnetic Field Interference Characteristics of Diff...

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8th International conference on Power and Renewable Energy, ICPRE 2023

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

ISBN: (纸本)9798350328813

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. © 2023 IEEE.

关键词： difference magneto-optical current transformer fault tolerance perspective magnetic field interference degree square structure zero-interference angle

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