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

共 445 条记录，以下是171-180 订阅

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design and analysis of the mirror system with off-axis field-of-view 19

Design and analysis of the mirror system with off-axis field...

引用

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

作者： Romanova, Galina E. Rodionova (Butylkina), Kseniia D. ITMO Univ 49 Kronverkskiy Pr St Petersburg 197101 Russia

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

Nowadays, the development of the space apparatus with high optical characteristics still stays the important task. The simplest systems which can provide the required characteristics for remote monitoring from the space are the three-mirror systems. It can be shown that in many cases, classical three-mirror systems have critical value of obscuration that leads to decreasing of resolution. Using off-axis field of view in the systems provides the way to avoid the obscuration influence. We present a technique for designing the three-mirror telescope objectives based on the systems with axial symmetry with an off-axis field of view.

关键词： mirror telescopes off-axis field of view optical design

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Enhancements to the optimisation process in lens design (I)

Enhancements to the optimisation process in lens design (I)

引用

conference on current developments in lens design and optical engineering II

作者： Schuhmann, R Adams, G The Optical Software Company United Kingdom LINOS Photonics GmbH Germany

ISBN: (纸本)0819441554

Over the years much time has been dedicated to improving lens optimisation routines. Most of the work has been upon the damped least squares (DLS) method. In this paper a number of theoretical and practical enhancements are presented. Some are new, others have already been published but never transposed into commercial software. These enhancements combine to allow the user to make more informed choices at every stage of an optimisation, and have now been incorporated into the widely used Winlens software package.

关键词： optical instrument lenses

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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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optical state estimation using wavefront data

Optical state estimation using wavefront data

引用

conference on current developments in lens design and optical engineering V

作者： Redding, D Sigrist, N Lou, JZ Zhang, Y Atcheson, P Acton, S Hayden, W CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)0819454613

The use of wavefront measurements to deduce the state of multiple optics in a telescope beam train - their misalignments and figure errors - can be confused by the fact that there are multiple potential sources for the same measured error. This talk applies Kalman filtering techniques as a tool for separating true telescope errors from artifactual testing errors in the alignment and testing of NASA's James Webb Space Telescope, a large segmented-aperture cryogenic telescope to be launched after 2010.

关键词： optical testing segmented mirror space telescope. wavefront control wavefront sensing state estimation

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Evaluation of deep learning-generated lens design starting points 11

Evaluation of deep learning-generated lens design starting p...

引用

conference on current developments in lens design and optical engineering xxI

作者： Cote, Geoffroi Lalonde, Jean-Francois Thibault, Simon Univ Laval Ctr Opt Photon & Laser Quebec City PQ G1V 0A6 Canada Univ Laval Lab Vis & Syst Numer Quebec City PQ G1V 0A6 Canada

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

Data-driven approaches to lens design have only recently begun to emerge. One particular way in which machine learning, and more particularly deep learning, was applied to lens design was by smoothly extrapolating from lens design databases to provide high-quality starting points for lens designers. This mechanism is used by the web application lensNet (which will be publicly available shortly) whose goal is to provide high-quality starting points that are tailored to the desired specifications, namely the effective focal length, f-number and half field of view. Here, we evaluate more thoroughly the designs that are inferred by lensNet and its underlying deep neural network. We provide a global quantitative assessment of the viability of the designs as well as a more targeted comparison among specific design families such as Cooke triplets and Double-Gauss lenses between expert-designed lenses and their automatically inferred counterparts.

关键词： lens design machine learning deep learning lens design optimization

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optical spherometer for measuring large curvature radii of convex surfaces 18

Optical spherometer for measuring large curvature radii of c...

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conference on current developments in lens design and optical engineering XVIII

作者： Alvarado Martinez, Jorge de Jesus Vazquez y Montiel, Sergio Camacho Bello, Cesar Joel Univ Politecn Tulancingo Tulancingo Hgo Mexico Univ Interserrana Estado Puebla Puebla Mexico

ISBN: (纸本)9781510612082;9781510612075

Measuring large curvature radii of convex surfaces with high precision is a challenge because the spherometer's focus must be positioned at the apex of the surface and at the center of curvature of the surface by moving the surface or the spherometer. If the radius of curvature is larger than the back focus of spherometer, then measurement is not possible. In this work, we propose to use the FOCOIVA system1 to move the focus of the spherometer in longitudinal way without modifying the f number by moving two lenses inside it, with this mechanism it is possible to measure radii of curvature of several meters in length. The curves of movement of the lenses and the optical parameters of the lenses that compose the spherometer are presented.

关键词： optical design spherometer radii of curvature convex surfaces

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Thermal optical Path Difference Analysis of Off-Axis lens Ray Trace Foot-Print at Cassegrain telescope correct lens assembly

Thermal Optical Path Difference Analysis of Off-Axis Lens Ra...

引用

conference on current developments in lens design and optical engineering XIII

作者： Hsu, Ming-Ying Lin, Yu-Chuan Chan, Chia-Yen Lin, Wei-Cheng Chang, Shenq-Tsong Huang, Ting-Ming Natl Appl Res Labs Instrument Technol Res Ctr Hsinchu 300 Taiwan

ISBN: (纸本)9780819492036

The Cassegrain telescope system in this study, is discussion correct lens thermal OPD (optical Path Difference) effect optical performance. The correct lens assembly are includes several components such as correct lens, lens mount, spacer, mount barrel and retainer. The heat transfer from surrounding to the correct lens barrel will causes optical system aberration. Meanwhile, the off-axis rays path of the OPD must consider lens incidence point and emergence point. The correct lens temperature distribution is calculate the lens barrel heat transfer analysis, the thermal distortion and stress are solve by FEM (Finite Element Method) software. The temperature calculation results can be weighting to each incidence ray path and calculate thermal OPD. The thermal OPD on Z-direction can be fitted by rigid body motion and Zernike polynomial. The fitting results can be used to evaluate the thermal effect on correct lens assembly in telescope system.

关键词： OPD FEM Ray trace Off-axis Correct lens

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Fundamental and specific steps in Shack-Hartmann wavefront sensor design

Fundamental and specific steps in Shack-Hartmann wavefront s...

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conference on current developments in lens design and optical engineering VII

作者： Curatu, Costin Curatu, George Rolland, Jannick Univ Cent Florida CREOL FPCE Coll Opt & Photon Orlando FL 32816 USA

ISBN: (纸本)0819463671

Shack-Hartmann sensors are widely used to measure wavefront aberrations. We present the fundamental and specific engineering steps in the design of Shack-Hartmann wavefront sensors. Typical performance requirements such as sensor dynamic range, sensitivity and accuracy are defined and discussed. We investigate the trade-offs between these performance metrics and the factors affecting the trade-offs. A first order approach for selecting the optimal parameters of the sensor central piece, the lenslet array, is presented. We also propose a quick tolerance analysis method that can predict the wavefront measurement error due to misalignments, using only the ray-tracing software.

关键词： wavefront sensing Shack-Hartmann sensor tolerance analysis

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Enhancement of light luminance film applied to the transparent display devices 17

Enhancement of light luminance film applied to the transpare...

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conference on current developments in lens design and optical engineering XVII

作者： Chiu, Chuang-Hung Chen, Yueh-Hao Chien, Wei-Cheng Chien, Chao-Heng Chunghwa Picture Tubes LTD Taiwan Taoyuan Taiwan Tatung Univ Taipei Dept Mech Engn Taipei Taiwan

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

Recently, the display device was developed to apply to the transparency display device(TDD), but the TDD was no brightness. The purpose of this paper was introduced a double layer optical film to improve luminance of the TDD. The film was doped micro metal oxide particles to increase the effect of scattering and refraction, and the micro structure was fabricated between the top and bottom film to enhance the light into the TDD. This research provided a transparent double layer optical film. The transparency of the film was achieved to 70 %, and the brightness efficiency up to 60 %.

关键词： Transparent display devices optical film Luminance Micro-particles

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optical encoder based on a non diffractive beam

Optical encoder based on a non diffractive beam

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conference on current developments in lens design and optical engineering VIII

作者： Lutenberg, A. Perez Quintian, F. Rebollo, M. A. Univ Buenos Aires Fac Ingn Lab Aplicac Opt Av Paseo Colon 850 Buenos Aires DF Argentina

ISBN: (纸本)9780819468154

Nowadays most industrial and laboratory motion measuring equipment makes use of optical encoders to measure rotation and linear displacements with sub-micrometrical resolution. In this work we introduce a new design of an optical encoder based on a non diffractive beam, a binary amplitude grating and a monolithic photodetector. Two theoretical models of the system are proposed and implemented to obtain numerical results. The performance of the design is also investigated through experimental measurements. Finally, the experimental results are compared with the models predictions.

关键词： metrology optical encoder sub-micrometric resolution non diffractive beam gratings

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