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

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Vision multiplexing: an optical engineering concept for low-vision aids

Vision multiplexing: an optical engineering concept for low-...

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conference on current developments in lens design and optical engineering VIII

作者： Peli, Eli Harvard Univ Sch Med Dept Ophthalmol Schepens Eye Res Inst Boston MA 02115 USA

ISBN: (纸本)9780819468154

The normal visual system provides a wide field of view apparently at high resolution. The wide field is continuously monitored at low resolution for navigation and detection of objects of interest. These objects are sampled using the high-resolution fovea, applying a temporal multiplexing scheme. Most vision impairments that cause low vision impact upon only one of the components;the peripheral low-resolution wide field or the central high-resolution fovea. The loss of one of these components prevents the interplay of central and peripheral vision needed for normal function and causes disability. Traditional low-vision aids improve the impacted component, but usually at a cost of a significant loss in the surviving component. For example, magnifying devices increase resolution but reduce the field of view, while minifying devices increase the field of view but reduce resolution. A general optical engineering approach - vision multiplexing - is presented. Vision multiplexing seeks to provide both the wide field of view and the high-resolution information in ways that could be accessed and interpreted by the visual system. The use of various optical and electro-optical methods in the development of a number of new visual aids, all of which apply vision multiplexing to restore the interplay of high-resolution and wide-angle vision using eye movements in a natural way, will be described. Vision-multiplexing devices at various stages of development and testing illustrate the successes and difficulties in applying this approach for patients with tunnel vision, hemianopia (half blindness), and visual acuity loss (usually due to central retinal disease).

关键词： bioptic telescope in-the-lens telescope IOL macular degeneration peripheral prisms retinitis pigmentosa

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Method to determine refractive index by measurement of flat plates 20

Method to determine refractive index by measurement of flat ...

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conference on current developments in lens design and optical engineering XX

作者： Johnson, R. Barry Curley, Michael J. Alabama A&M Univ Dept Phys Chem & Math Coll Engn Technol & Phys Sci Huntsville AL 35811 USA Alabama A&M Univ Dept Elect Engn & Comp Sci Coll Engn Technol & Phys Sci Huntsville AL 35811 USA

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

Minimal refractive index data in the near-infrared spectrum are available for optical plastics. Typically, refractive index measurements are made by fabricating a prism of candidate optical material and using appropriate metrology equipment. Few plastics are available in thicknesses adequate to fabricate appropriate size prisms;however, almost all optical plastics can be acquired in a flat plate form. The investigation considered two fundamental approaches to measure the refractive index by (i) rotating a flat plate and measure the beam displacement and ( ii) measuring the optical focal shift. The rotation method was determined not accurate enough. An optical focal shift method optical(n = t(optical)/t(mechanical)) was developed that utilized existing laboratory equipment. The shift of focus when the plastic plate sample was inserted was located by determining the position of maximum contrast of the projection of a Ronchi ruling target when illuminated by flux from a Cary Eclipse covering the spectral range of 550-975 nm. The instrumentation, data processing, and measurement performance are presented.

关键词： refractive index measurement metrology optical materials

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Improving efficiency of beam splitter for DVD pickup

Improving efficiency of beam splitter for DVD pickup

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conference on current developments in lens design and optical engineering V

作者： Chen, WJ Chen, CH Shieh, HPD Natl Taiwan Univ Sci & Technol Dept Elect Engn Taipei 106 Taiwan

ISBN: (纸本)0819454613

The majority of the beam splitters for three beam tracking in commercial DVD pickup employ lamellar phase gratings, which already provides sufficient efficiency. However, for a pickup with all diffractive elements, the power budget becomes more critical, and a higher efficiency of the beam splitter is required. In this paper, we have investigated and will present the influence of the desired energy ratio between the zeroth order central beam to the first order side beam on the total efficiency of the beam splitter. The simulation based on scalar diffraction theory shows that the total efficiency of a lamellar phase grating will drop as the ratio decrease, which can be improved by employing a more sophisticated surface relief. The equal-side triangular profile has been investigated as a solution and the geometrical size of the profile has been optimized for several desired energy ratio. For a low cost fabrication process with photolithography, the total efficiency loss due to quantization with different quantization levels of the triangular surface relief has been estimated with scalar diffraction theory. This paper is concluded with a table of optimal phase level for a given energy ratio and desired minimum total efficiency with the consideration of fabrication cost.

关键词： DVD pickup beam splitter diffractive optical element

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Two-axis, optical adjustment flexure mechanism

Two-axis, optical adjustment flexure mechanism

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conference on current developments in lens design and optical Systems engineering

作者： Bell, AD Cronin, SR ITT Ind Aerosp Commun Div Ft Wayne IN 46801 USA

ISBN: (纸本)0819437387

This technical paper describes an adjustment mechanism capable of producing microradian resolution rotational motion of an optical element. The mechanism rotates an optical element about two orthogonal axes utilizing flexure beam elements. The flexures facilitate frictionless rotation about the center of the optical element, in roll and tilt over a 1.5 degree range. The optical element is retained in an athermal mount to minimize distortion. The mechanism is constructed entirely of titanium. Integral to the mechanism is adjustment actuators to provide position adjustment of the optical element. Locking actuators retain the mechanism's final adjusted positions when exposed to severe vibration and thermal environments. The mechanism configuration may be scaled in size appropriate to the optical component requiring mounting. Although the flexure mechanism is patent pending(1), this paper presents an overview of the engineering principles utilized in precision mechanisms that the reader may be able to utilize in his or her design project.

关键词： opto-mechanical mechanism flexure roll and tilt adjustment optical component vibration stability

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Proceedings of SPIE - The International Society for optical engineering

Proceedings of SPIE - The International Society for Optical ...

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1980 International lens design conference

The proceedings contain 68 papers. The topics discussed include: distributed computing for optical design;current status of the synthesis of optical systems (SYNOPSYS) lens design program;new developments in CODE V optimization;optical design programs at imperial college;optical design using small dedicated computers;dedicated minicomputers in optical design;consideration for minicomputer applications to large optical design programs;microcomputers and optical design;easy to use optical program for commodore PET computer;new approach to the optimization of lens systems;ten years of lens design with Glatzel's adaptive method;aberration balancing criterion for nondiffraction-limited lenses;and application of Zernike polynomial lens sensitivity program ZEST to optimizing a lens design.

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optical Systems for Large-aperture Phased Laser Array Including Diffractive Optics 20

Optical Systems for Large-aperture Phased Laser Array Includ...

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conference on current developments in lens design and optical engineering XX

作者： Erlikhman, Jacob Krogen, Peter Srinivasan, Prashant Hettel, Will Meinhold, Peter Lubin, Philip Univ Calif Santa Barbara Dept Phys Broida Hall Santa Barbara CA 93106 USA

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

Directed energy propulsion for interstellar travel has been proposed as an ideal method for reaching appreciable speeds relative to the speed of light: 0.2c. However, the amount of energy required necessitates a large aperture, on the order of kilometers, while mitigation of atmospheric perturbations requires a discretization of the aperture into many individual laser elements. The use of fiber lasers for these elements obligates mode-matching the fiber to the desired 10 cm aperture for a collimated beam. Various collimation systems were designed and compared. A 3-lens system with one achromat and two aspheric lenses, with two of the lenses used as a Keplerian telescope to achieve a system-shortening effect was analyzed. A similar system made with a plano-convex lens replacing the large-aperture aspheric lens with two additional compensating lenses was compared. A single diffractive optic operating at F/8 was likewise considered. The optical performance of these systems was compared, as was the cost-effectiveness. Scalability to millions of elements was required, so cost-per-system was a crucial consideration factor. Possible manufacturing processes for a diffractive system were investigated, and stamping processes for replication were analyzed to determine the possibility of replication of such an optic reliably, cheaply, and with acceptable results.

关键词： Directed energy optical design diffractive optical elements corrective optical elements laser propulsion

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current developments in lens design and optical engineering XIV

Current Developments in Lens Design and Optical Engineering ...

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conference on current developments in lens design and optical engineering

ISBN: (纸本)9780819496911

The proceedings contain 37 papers. The topics discussed include: radiance limits of ceramic phosphors under high excitation fluxes;application of heterogeneous microlenses for solid state lighting;design of compact fisheye lens with slope-constrained Q-type aspheres;analytic formulas of the aspheric terms for convex-plano and plano-convex aspheric lenses;multi-core and GPU accelerated simulation of a radial star target imaged with equivalent T-number circular and Gaussian pupils;man versus machine: a lens design challenge;a 3D photographic capsule endoscope system with full field of view;double micro-prism array design for reducing dispersion on prism-based stereo camera system;optical architecture of the new generation infrared atmospheric sounder interferometer (IASI-NG);a three-channel miniaturized optical system for multi-resolution imaging;backward reflection analysis of transmitting channel of active laser ranging;and further results in measuring water ice buildup on optical components in cryogenic vacuum chambers.

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Multi-aperture microoptical system for close-up imaging 15

Multi-aperture microoptical system for close-up imaging

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conference on current developments in lens design and optical engineering XV

作者： Berlich, Rene Brueckner, Andreas Leitel, Robert Oberdoerster, Alexander Wippermann, Frank Braeuer, Andreas Fraunhofer Inst Appl Opt & Precis Engn D-07745 Jena Germany

ISBN: (纸本)9781628412192

Modern applications in biomedical imaging, machine vision and security engineering require close-up optical systems with high resolution. Combined with the need for miniaturization and fast image acquisition of extended object fields, the design and fabrication of respective devices is extremely challenging. Standard commercial imaging solutions rely on bulky setups or depend on scanning techniques in order to meet the stringent requirements. Recently, our group has proposed a novel, multi-aperture approach based on parallel image transfer in order to overcome these constraints. It exploits state of the art microoptical manufacturing techniques on wafer level in order to create a compact, cost-effective system with a large field of view. However, initial prototypes have so far been subject to various limitations regarding their manufacturing, reliability and applicability. In this work, we demonstrate the optical design and fabrication of an advanced system, which overcomes these restrictions. In particular, a revised optical design facilitates a more efficient and economical fabrication process and inherently improves system reliability. An additional customized front side illumination module provides homogeneous white light illumination over the entire field of view while maintaining a high degree of compactness. Moreover, the complete imaging assembly is mounted on a positioning system. In combination with an extended working range, this allows for adjustment of the system's focus location. The final optical design is capable of capturing an object field of 36x24 mm(2) with a resolution of 150 cycles/mm. Finally, we present experimental results of the respective prototype that demonstrate its enhanced capabilities.

关键词： Multi-aperture imaging microoptics multi-channel optical design image sensors

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optical design for the Adaptive Secondary Setup and Instrument Stimulator (ASSIST)

Optical design for the Adaptive Secondary Setup and Instrume...

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conference on current developments in lens design and optical engineering VII

作者： Hallibert, Pascal Arsenault, Robin Delabre, Bernard Esposito, Simone Hubin, Norbert Quirrenbach, Andreas Riccardi, Armando Stroebele, Stefan Stuik, Remko Vink, Ramon Leiden Observ POB 9513 NL-2300 RA Leiden Netherlands ESO DE-85748 Garching Germany Osserv Astrofis Arcetri I-50125 Florence Italy

ISBN: (纸本)0819463671

A comprehensive suite of Adaptive Optics systems and AO-assisted instruments is currently under development for the VLT and will be built around a hyperbolic convex adaptive Deformable Secondary Mirror (DSM). In telescopes with such a secondary mirror, test and calibration of both the DSM and the science instruments using it are notoriously expensive and time-consuming. The Adaptive Secondary Setup and Instrument Stimulator (ASSIST) is being developed to allow test and integration of three key elements of the future VILT Adaptive Telescope Facility: the DSM and 2 instrument-specific adaptive optics systems (GALACSI for MUSE and GRAAL for HAWK-I). The core of ASSIST is a standalone interferometric test setup for the DSM allowing its test at its center of curvature (significantly reducing the size of the classical hyperbole focii test configuration). This setup is completed by a star simulator for both natural and laser guide stars, a turbulence generator (for realistic AO performance measurements), a corrector system generating a VLT-like exit pupil and a Nasmyth rotator simulator interfacing with the two AO systems. In this paper we present the optical architecture of ASSIST, detailing the current design of the different parts of the system, and discuss its projected performance and compliance with the test and calibration requirements.

关键词： Adaptive Optics Deformable Secondary Mirror ASSIST Test Bench Pupil Imaging Turbulence Generator VLT Adaptive Optics Facility GALACSI GRAAL MUSE HAWK-I

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Reduce Volume of Head-Up Display by Image Stitching 17

Reduce Volume of Head-Up Display by Image Stitching

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conference on current developments in lens design and optical engineering XVII

作者： Chiu, Yi-Feng Su, Guo-Dung J. Natl Taiwan Univ Grad Inst Photon & Optoelect 1Roosevelt RdSect 4 Taipei Taiwan

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

Head-up Display (HUD) is a safety feature for automobile drivers. Although there have been some HUD systems in commercial product already, their images are too small to show assistance information. Another problem, the volume of HUD is too large. We proposed a HUD including micro-projectors, rear-projection screen, microlens array (MLA) and the light source is 28 mm x 14 mm realized a 200 mm x 100 mm image in 3 meters from drivers. We want to use the MLA to reduce the volume by virtual image stitching. We design the HUD's package dimensions is 12 cm x 12 cm x 9 cm. It is able to show speed, map-navigation and night vision information. We used Liquid Crystal Display (LCD) as our image source due to its brighter image output required and the minimum volume occupancy. The MLA is a multi aperture system. The proposed MLA consists of many optical channels each transmitting a segment of the whole field of view. The design of the system provides the stitching of the partial images, so that we can see the whole virtual image. (C) 2016 optical Society of America

关键词： Heads up displays Microlens array Light sources Distortion Eye models LCDs Microlens Night vision optical design Spherical lenses

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