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

共 530 条记录，以下是241-250 订阅

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optical design of the JWST Fine Guider Sensor

Optical Design of the JWST Fine Guider Sensor

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conference on current developments in lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Zheng, Sheng Hai Evans, Clinton COMDEV Int Ltd Ottawa ON K2K 3J1 Canada

ISBN: (纸本)9780819482822

The Fine Guidance Sensor (FGS) is part of the science instrumentation for the James Webb Space Telescope (JWST). The FGS is required to operate at 37 K and provide the data needed to facilitate fine pointing and attitude stabilization necessary to meet the requirements of the mission's science and engineering operations. We describe here the selection of the proper optical design form to meet requirements and its relative merits. The FGS has progressed with the successful completion of several key design reviews. The optical design of the current stage will be discussed here in detail.

关键词： Fine guidance sensor FGS James Webb space telescope JWST

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Analysis of opto-mechanical performance of a tunable liquid lens

Analysis of opto-mechanical performance of a tunable liquid ...

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conference on current developments in lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Santiago-Alvarado, A. Vazquez-Montiel, S. Gonzalez-Garcia, J. Munoz-Lopez, J. Campos Garcia, Manuel Univ Tecnol Mixteca Carre Acatlima Km 2-5 Huajupan De Leon Oaxaca Mexico Astron Inst Opt Elect Labs Puebla Mexico Univ Nacl Estadual Sao Paulo Mexico City DF Mexico

ISBN: (纸本)9780819482822

Recently in the micro-optical engineering area has been a grown in use of tunable liquid lenses because this lenses us allow versatility in the focusing range, also an easy handling and implementation. In the literature, many tunable lens models have been reported, but most of this work has been on describing the optical quality of the images, the opto-mechanical analysis is neglected. In this paper, an analysis of opto-mechanical of a tunable liquid lens is presented, for this;we show a finite element simulation of mechanical behavior and estimate how this influences in the optical performance of the lens. The liquid lens is composed of two elastic transparent membranes and of a cylindrical metallic mount.

关键词： Tunable liquid lens PDMS mechanical properties

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Study of the influence of the tetrahedral reflectors properties on the autocollimating systems characteristics

Study of the influence of the tetrahedral reflectors propert...

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conference on current developments in lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Anisimov, Andrey G. Tsyganok, Elena A. Konyakhin, Igor A. St Petersburg State Univ Informat Technol Mech & Dept Opt Elect Devices & Syst 49 Kronverksky Av St Petersburg 197101 Russia Dept Appl & Comp Opt Petrozavodsk R-197101 Russia

ISBN: (纸本)9780819482822

Improving of the autocollimating systems characteristics is a line of optical engineering development. It is associated with study of initial errors and ways of their reduction. Study is devoted to the influence of tetrahedral reflectors properties (errors of dihedral angles) on the characteristics (accuracy et al) of autocollimating and autoreflection optical-electronic systems for positioning control. The MATLAB mathematical model of tetrahedral reflector was developed for these purposes;results of simulation were compared with Zemax simulation. It is important to notice that the process of image formation is quite complex, it explains by superposition of six reflected and deflected beams. Because of the dihedral angle errors six compound images separate or overlap;that causes the redistribution of energy and image becomes complicated for processing. The aim is to study the influence of reflector properties on position of the image energy center, because it defines the measurement error. The influence of the tetrahedral reflector properties on system's characteristics is shown by example of shift control system based on autoreflection scheme.

关键词： tetrahedral reflector corner-cube prism autocollimating system autoreflection system

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The design and fabrication of telecentric lens with large field of view

The design and fabrication of telecentric lens with large fi...

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conference on current developments in lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Chang, Chun-Li Huang, Kuo-Cheng Wu, Wen-Hong Lin, Yi-Hung Natl Appl Res Labs Instrument Technol Res Ctr Hsinchu Taiwan Natl Pingtung Univ Sci & Technol Dept Engn Mech Pingtung Taiwan

In ultra-precision (distortion 100 mm). Based on the concept of equivalent design in optical tolerances, the lens module can be designed readily into a telecentric system, which consists of five spherical lenses and a... 详细信息

ISBN: (纸本)9780819482822

In ultra-precision (distortion <0.5%) vision inspection system, the accuracy of measurement depends on sharpness and distortion of image. The telecentric lens provides distortion-free and constant magnification (within depth of field) image, so it has become an indispensable key module in the amount of visual measuring system. The article presents a design and development of telecentric lens module for the wide range of vision inspection system (field-of-view >100 mm). Based on the concept of equivalent design in optical tolerances, the lens module can be designed readily into a telecentric system, which consists of five spherical lenses and a glass molded aspheric lens. In order to correct image distortion, an aspheric lens would be added to the telecentric system. The experiment shows that the distortion can be reduced from 1.5% to 0.34% and the depth of field (DOF) is also improved up to 28.3 mm.

关键词： telecentric lens machine-vision aspheric lens equivalent tolerance

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Accelerating diffractive optics design with GPU-based parallel technique

Accelerating diffractive optics design with GPU-based parall...

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conference on current developments in lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Liu, Kan Li, Hui Zhang, Xinyu Li, Dehua Wei, Mingyue Li, Bin Xie, ChangSheng Zhang, Tianxu Huazhong Univ Sci & Technol Inst Pattern Recognit & Artificial Intelligence State Key Lab Multispectral Informat Proc Technol Wuhan 430074 Hubei Peoples R China Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China

ISBN: (纸本)9780819482822

In this paper GPU based data parallel technique is used to reduce calculating time in diffractive optics elements (DOE) design. By using compute unified device architecture (CUDA) framework, comparison of acceleration radio of some major methods using in DOE design, including Gerchberg Saxton algorithm for global optimization in conjunction with Rayleigh-Sommerfeld diffractive integrating transformation, genetic algorithm with a finite-difference time-domain method and simulated annealing algorithm, is made with demonstrational DOE-lens design, whose focal spot size is 0.5 mu m, incident light wavelength is 650 nm, focal length is 3mm, DOE aperture size is 2mm.

关键词： DOE design GPU acceleration CUDA Algorithm comparison

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design and Fabrication of Super mirrors on the Zerodur substrate

Design and Fabrication of Super mirrors on the Zerodur subst...

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conference on current developments in lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Cho, Hyun-Ju Jeon, Young-Zip Daeduk Univ Dept Firearms & Opt 48 Jang Dong Taejon 305715 South Korea Daeduk Univ Dept Special Weapon Taejon 305715 South Korea

ISBN: (纸本)9780819482822

Super mirror is a high reflectance mirror with very low absorption and scattering losses. We carefully measured the surface roughness of Zerodur substrate using phase shift interferometer and atomic force microscope, and compared it with the scattering of the mirror. The absorption of the mirror was measured by cavity ring-down method, and its results were correlated to the thin film structure. To avoid the UV degradation which comes from the He-Ne plasma, we carefully select the mirror fabrication material, and design the high reflectance mirror. Finally, mirror was fabricated by ion beam sputtering method and its optical properties were measured.

关键词： super mirror ion beam sputtering super-polishing Zerodur loss roughness scattering UV degradation

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current developments in lens design and optical engineering XI;and Advances in Thin Film Coatings VI

Current Developments in Lens Design and Optical Engineering ...

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current developments in lens design and optical engineering XI;and Advances in Thin Film Coatings VI

ISBN: (纸本)9780819482822

The proceedings contain 35 papers. The topics discussed include: CCT-dependent calibration for colorimeters;high performance of color mixing and projection lighting based on color LEDs;research on angle-selective filters of phosphor color wheel for LED projectors;high-efficiency LED street light using micro-lens array;optical performance as a function of phosphor particle number in white LED;a novel approach for structural synthesis of zoom systems;accelerating diffractive optics design with GPU-based parallel technique;ultra-compact close-up microoptical imaging system;design and implementation of recording and readout system for micro-holographic optical data storage;perceptual image quality and telescope performance ranking;ion-beam figuring (IBF) for high-precision optics becomes affordable;and flat liquid crystal diffractive lenses with variable focus and magnification.

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Fabrication of eyeball-like spherical micro-lens array for optical fiber coupling

Fabrication of eyeball-like spherical micro-lens array for o...

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2009 ASME International design engineering Technical conferences and Computers and Information in engineering conference, DETC2009

作者： Shen, S.C. Pan, C.T. Shyu, R.F. Chao, C.H. Huang, J.C. Yen, C.Y. Department of Systems and Naval Mechatronic Engineering National Cheng Kung University Tainan 701 Taiwan Department of Mechanical and Electro-Mechanical Engineering Center for Nanoscience and Nanotechnology National Sun Yat-Sen University Kaoshiung 804 Taiwan Department of Mechanical and Computer Aided Engineering National Formosa University Yunlin Taiwan

ISBN: (纸本)9780791849002

Batch-fabrication of eyeball-like spherical micro-lens not only reduces micro assembly cost, but also replaces conventional ball-lenses or costly GRINs (Gradient Reflective Index) without sacrificing performance. Compared to the conventional micro-lenses made in a half-spherical geometry, the eyeball-like micro-lens is a sphere, which allows focusing light in all directions on the substrate surface, thus providing application flexibility for optical applications. The current eyeball-like spherical micro-lens is made using photoresist SU-8. This work develops a batch process at low temperature by spin-coating SU-8 on a surface of silicon wafer. The SU-8 thick film is patterned by UV lithography to form an array of holes for holding eyeball-like spherical micro-lens. The fabrication process employs bulk micromachining to fabricate an array of nozzles on the silicon wafer. Next, this process pours viscous SU-8 into the cavity of silicon wafer and presses it through the nozzle before reflow. The eyeball-like spherical micro-balls form by balancing between surface tension and cohesion. Varying the amount of SU-8 pressed through the nozzle controls the diameter of the balls. This paper designs a pattern with a 3 x 3 lens-array with a numerical aperture of about 0.38. Diameters range from 60 to 500 um. optical measurements indicate a diameter fluctuation within 3% and an optical insertion loss is below 2.5dB with a wavelength of 635nm in a single-mode fiber (SMF). Therefore the eyeballlike spherical micro-lens is capable of increasing coupling efficiency. Copyright © 2009 by ASME.

关键词： optical fiber fabrication

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current developments in lens design and optical engineering X

Current Developments in Lens Design and Optical Engineering ...

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current developments in lens design and optical engineering X

ISBN: (纸本)9780819477187

The proceedings contain 22 papers. The topics discussed include: optical design dependence on technology development;practical design considerations for modern photographic optics;display systems and registration methods for mixed reality applications;efficient design process for the evaluation and control of flare in opto-mechanical systems;finding order in the design landscape of simple optical systems;design and optimization of a collimating optical system for high divergence LED light sources;point symmetric design approach to a wide-field wide-wavelength cat's eye retro-reflector anastigmat;fast catadioptric optics with large field of view;thinking outside the barrel: what really matters in modern photographic lens design;calculation of optical forces on a dielectric bead in a geometrically aberrated trap;and relationships between lens performance and different sensor sizes in professional photographic still SLR cameras.

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Practical design considerations for modern photographic optics

Practical design considerations for modern photographic opti...

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SPIE optical engineering + Applications

作者： Rockwell, Ken *** Post Office Box 8778 San Diego CA 92038-8778 United States

ISBN: (纸本)9780819477187

In the 1950s, cameras and lenses didn't communicate. optical bench tests were sufficient to characterize lens performance completely. Today, optics are only one small factor in the much larger electro-optical systems which are today's cameras. Bench performance alone isn't enough. For a lens to be useful it must work in concert with modern cameras' focus, exposure and data systems. This paper explores these numerous issues and their influences on lens design. Outside-the-barrel ergonomic and systems issues are covered in SPIE paper 7428-19. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： Cameras

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