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An optical switch of natural light guiding system based on cubic structure with Fresnel surface

An optical switch of natural light guiding system based on c...

引用

SPIE optical engineering + Applications

作者： Chou, Kao-Hsu Chen, Yi-Yung Whang, Allen Jong-Woei Photonics System Simulation and Design Laboratory Department of Electronic Engineering National Taiwan University of Science and Technology Taipei 106 Taiwan Photonics System Simulation and Design Laboratory Department of Electro-Optical Engineering National Taiwan University of Science and Technology #43 Sec. 4 Keelung Rd. Taipei 106 Taiwan

ISBN: (纸本)9780819477187

Recently, many researches focus on illumination with sunlight for saving energy and healthy lighting. A Natural Light Guiding System has collecting, transmitting, and lighting parts. In most systems, the paths on transmitting part are fixed so the collected sunlight of the Natural Light Guiding System can not be free managed and is sometime wasted. In this paper, we design an optical switch to change the path of the collected sunlight on the transmitting sunlight. The switch is cubic structure that includes a 45 degree mirror for reflecting sunlight. According to the structure of the optical switch, we can rotate the switch to manage the path of the collected sunlight. When the path is parallel with the mirror, the sunlight will pass through the switch;and when the included angle between the path and mirror is 45 degree, we can change the path of light. For coupling the exit beam into lightpipe, we design the surfaces of cubic structure to be aspheric surface with Fresnel surface. Finally, we simulate the efficiency of the optical switch when the path is changed by the mirror. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： Lighting

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optical design of a highly segmented wide field spectrograph

Optical design of a highly segmented wide field spectrograph

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SPIE optical engineering + Applications

作者： Magrin, Demetrio Ragazzoni, Roberto Gentile, Giorgia Dima, Marco Farinato, Jacopo INAF - Osservatorio Astronomico di Padova vicolo dell'Osservatorio 35122 Padova Italy

ISBN: (纸本)9780819477187

A lot of scientific interest around both seeing limited wide field imaging and wide field spectroscopy has been shown in the recent past. Technological difficulties have indeed been identified when proposing classical prime focus corrector for 8 meters class telescopes with Field of View bigger than one degree, because of the huge opto-mechanics and of the very large arrays of detectors required. A new concept, the Smart Fast Camera, has been recently proposed: the idea behind relays on splitting the huge Field of View in smaller portions, each of them re-imaging onto a reasonable size detector a part of the scientific Field of View. In this way, one could think to build a modular instrument, with most of the components identical for each module, with the exception of the field corrector, which is of course radial dependent. In this paper, a further development of this concept, allowing for spectroscopy, is presented, applied to an existing 8 meter class telescope, the Large Binocular Telescope. A preliminary study is traced out, with the aim to find a feasible optical design for such an instrument. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： optical design

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Exact analytical astigmatic function of aspherical surfaces

Exact analytical astigmatic function of aspherical surfaces

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SPIE optical engineering + Applications

作者： Hristov, B.A. Central Laboratory of Optical Storage and Processing of Information Bulgarian Academy of Sciences P.O.Box 95 Sofia 1113 Bulgaria

ISBN: (纸本)9780819477187

We derive an exact analytical image astigmatic function for aspherical and hyper-aspherical surfaces of arbitrary shape that describes correctly (without any approximations) image astigmatism for the whole object space and investigate this function for two general cases: in the presence and in the absence of object astigmatism. So we discover the boundary astigmatism correction ability of aspherical surfaces. We prove that in general there are two anastigmatic points on each chief ray in every aspherical surface. We find as well analytical expressions for anastigmatic and extreme points of the function and its vertical and horizontal asymptotes. As a result we prove that in the object and image space of every refracting aspherical surface at each stop position there are two pairs of anastigmatic surfaces one of them coincides with the refracting surface itself. In the object and image space of every reflecting aspherical surface at each stop position there is in general one anastigmatic surface which coincides with the reflecting surface itself. There are special cases when the whole space of the reflecting aspherical surface is anastigmatic. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： optical design

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optical system module having zooming function and image quality of mega pixel for a cellular phone camera

Optical system module having zooming function and image qual...

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SPIE optical engineering + Applications

作者： Park, Seong Jong Lee, Jong Jin Chung, Chang Sub Vision Optics Lab. Suncheon Cheongam College Suncheon 540-743 Korea Republic of Optoelectronics Technological Institute KOLEN Co. Seongnam 462-807 Korea Republic of Department of Physics Chonnam National University Kwangju 500-757 Korea Republic of

ISBN: (纸本)9780819477187

We designed and developed a cellular phone camera like HD digital still camera having zooming function. To design an optical system module having the auto-zooming and the image quality of 2M mega pixel using Code V, we considered 6 lenses which were four aspheric plastic lenses and two glass lenses. The specifications of designed optical system module for a cellular phone camera were the focal length of 4.29mm at wide position to 10.55mm at tele position, fnumber of 3.2 at wide position to 5.3 at tele position, and field of view of 27.4 degree at tele position to 65.8 degree at wide position. Its zoom ratio was 2.5. The values of modulation transfer function (MTF) at 200lp/mm of the designed optical system module were over 21% at zoom position. We applied the design results of optical system module to the fabrication of a cellular phone camera having the zoom ratio of 2.5 and the image quality of 2M mega pixel, and adopted the aspheric glass lens having higher abbe number to compensate chromatic aberration and the VCM (Voice Coil Motor) as sub-miniature motor. We fabricated the optical module system having zoom ratio of 2.5 and image quality of 2M mega pixel in order to apply to a HD cellular phone camera. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： optical systems

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current developments in lens design and optical engineering IX

Current Developments in Lens Design and Optical Engineering ...

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current developments in lens design and optical engineering IX

ISBN: (纸本)9780819472809

The proceedings contain 26 papers. The topics discussed include: low-scatter bare aluminum optics via chemical mechanical polishing;forces acting between polishing tool and workpiece surface in magnetorheological finishing;material removal study at silicon nitride molds for the precision glass molding using MRF process;design and fabrication of low-cost thermal imaging optics using precision chalcogenide glass molding;day and night security camera;high-resolution UV relay lens for particle size distribution measurements using holography;new tools for the lens designer;optical design of reflective wide-field cameras;five-lens corrector for Cassegrain-form telescopes;material selection for color correction in the short-wave infrared;correctly making panoramic imagery and the meaning of optical center;and 3D imaging from theory to practice: the Mona Lisa story.

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New tools for the lens designer

New tools for the lens designer

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Conference on current developments in lens design and optical engineering IX

作者： Dilworth, Donald C. Optical Systems Design Inc. (United States)

ISBN: (纸本)9780819472809

Several common impediments to successful lens design can be removed by application of new techniques. These involve using information that has long been calculated during the design process, but then discarded. Problems so addressed include the nuisance of discovering ray failures in the starting configuration, and that of tolerance desensitization, among others.

关键词： lens optimization ray failures tolerance desensitization starting point stop position avoiding strain

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optical design of reflective wide-field cameras

Optical design of reflective wide-field cameras

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Conference on current developments in lens design and optical engineering IX

作者： Sasian, Jose Univ Arizona Coll Opt Sci Tucson AZ 85721 USA

ISBN: (纸本)9780819472809

This paper discusses some methodologies that apply to the optical design of reflective wide-field cameras. Among the methods considered are off-axis and eccentric pupil systems, concatenation of systems, tilted component systems, aberration theory, and confocal systems. The goal of the paper is to review design methods. In particular some systems are shown to illustrate two methodologies.

关键词： optical design mirror design wide-field reflective optics unobscured

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An optically passive athermal infrared optical system

An optically passive athermal infrared optical system

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Conference on current developments in lens design and optical engineering IX

作者： Li, Hua Shen, Mangzuo Chinese Acad Sci Inst Opt & Elect Chengdu 610041 Sichuan Prov Peoples R China

ISBN: (纸本)9780819472809

An optically passive athermal infrared optical system working in the 8 - 12 micron long wavelength infrared band was designed by using a special infrared optical material AMTIR (amorphous material transmitting infrared radiation). The design principle, design results are described in this paper. In addition, the optical system was incorporated with an infrared focal plane array forming an infrared camera. The thermal test of imaging quality of this camera is also presented

关键词： infrared optical system optical design athermal optical system

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design Efficiency of 3188 optical designs

Design Efficiency of 3188 Optical Designs

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Conference on current developments in lens design and optical engineering IX

作者： Cakmakci, Ozan Rolland, Jannick P. Thompson, Kevin P. Rogers, John Univ Cent Florida CREOL Coll Opt & Photon Orlando FL 32816 USA Opt Res Associates Pasadena CA USA

ISBN: (纸本)9780819472809

In this study, we take a data-driven approach to study the design efficiency of a variety of optical designs. Efficiency is defined to be the number of resolvable spots across the image per lens element. 3188 designs were selected from a commercially available lens database. Each design was imported into a raytrace code, briefly optimized, and the number of resolvable spots was computed. Examples of efficient designs within this dataset are shown. Four design efficiency groupings are created and discussed separately: 1) all-spherical, monochromatic designs, 2) monochromatic designs with some aspheres, 3) all-spherical, polychromatic designs, and 4) polychromatic designs with some aspheres. Zoom lens systems were excluded from the dataset. The results of the analysis are intended to answer the question of "how many elements does it take, as a minimum, to deliver a certain number of resolved spots?"

关键词： optical system design efficiency database analysis

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Automated design and fabrication of ocular optics

Automated design and fabrication of ocular optics

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Conference on current developments in lens design and optical engineering IX

作者： Gutin, Mikhail Gutin, Olga Appl Sci Innovat Inc Troy NY 12180 USA

ISBN: (纸本)9780819472809

Automated computer-aided procedure for component selection, optical design, and optimization was developed and used to produce prototype ocular optics of a head-mounted display for biomedical imaging, with the field of view and resolution approaching those of normal human vision. The new display has the potential to dramatically increase the amount and fidelity of real-time visual information presented to the user. The selected approach was based on a tiled configuration and "optically stitched" virtual image, resulting in seamless imagery generated by multiple micro-displays. Several optical configurations were studied in the design stage, to arrive at the optimal optical layout. The automated procedure provided for extensive search of the best candidate stock components out of thousands of candidate lenses offered by different vendors. At each iteration, the candidate lens was "digitally inserted" in the optical layout, its position was optimized, and the achieved merit function characterizing the quality of the stitched image was stored, along with the design prescription. A few best designs were then closely evaluated in a traditional "manual" procedure. The design effort was followed by experimental demonstration and tests of a limited prototype optical system.

关键词： optical design lens design head mounted display HMD

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