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

共 444 条记录，以下是141-150 订阅

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Analysis and design of an adaptive lens

Analysis and design of an adaptive lens

引用

conference on current developments in lens design and optical engineering VII

作者： Santiago-Alvarado, A. Vazquez-Montiel, S. Gonzalez-Garcia, J. Garcia-Luna, V. M. Fernandez-Morena, A. Vera-Diaz, E. UTM Inst Fis & Matemat Huajuapan Leon Oaxaca 6900 Mexico INAOE Inst Opt Puebla Mexico

ISBN: (纸本)0819463671

This study presents the design and analysis of a lens with a variable focal length, which we will call an adaptive lens. This lens is formed of two transparent elastic surfaces with a transparent liquid medium between them. The mechanical design of the lens considers the variation of liquid pressure between the surfaces. This causes changes in curvature radii and in the axial thickness, generating variations in the focal length of the lens. An analysis is given of changes in lens power with respect to changes in pressure. Finally, a model of the human eye is presented using this adaptive lens as crystalline.

关键词： adaptive elastic surfaces liquid lens model human eyes

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Simultaneous color-mixing and collimation within LED package

Simultaneous color-mixing and collimation within LED package

引用

conference on current developments in lens design and optical engineering XIV

作者： Moreno, Ivan Rodriguez, Nayeli Carlos Basilio, Jose Univ Autonoma Zacatecas Unidad Acad Fis Zacatecas 98060 Mexico

ISBN: (纸本)9780819496911

A compact encapsulating lens is proposed and analyzed, which simultaneously collimates and mixes the tunable light from red, green and blue (RGB) light-emitting diode (LED) chips. Colored LED chips are embedded within a spherical lens, and a section of the sphere that surrounds chips is mirrored with a diffuse reflector. Color light is mixed by multiple total internal reflections (TIRs), the scattering mirror breaks TIR, and light escapes only in a narrow beam in the forward direction. The color distribution, the beam pattern, and efficiency are analyzed by Monte Carlo ray tracing calculations.

关键词： Encapsulating lens Light Projection Mix of Color Illumination Spotlights

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Achieving linearity with an optical quadrant detector tracking system 18

Achieving linearity with an optical quadrant detector tracki...

引用

conference on current developments in lens design and optical engineering xviII

作者： Doherty, Victor J. Aouani, Dina Eidolon Opt LLC 3 Erie Dr Natick MA 01760 USA

ISBN: (纸本)9781510612082;9781510612075

Conventional round spot quadrant detector trackers are inherently non-linear. This non-linearity requires multiple iterations to converge onto perfect alignment with the object tracked. We created a system that generates a square spot. The convolution of a square spot with a circle, generated by the quadrant detector, allows this spot to achieve perfect alignment in one iteration. This invention is thus essential to any system that requires speed and accuracy. In this paper, we introduce the theory behind the square spot as well as the design of our linear optical quadrant detector tracking technology.

关键词： Quadrant Detector optical Tracking Sun Tracking Solar Surgery Square Spot

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Ultra-fast focal reducer design for ∼2m-class telescopes

Ultra-fast focal reducer design for ∼2m-class telescopes

引用

conference on current developments in lens design and optical engineering V

作者： Beach, D Appl Phys Ltd Christchurch 8153 New Zealand

ISBN: (纸本)0819454613

An ultra-fast focal reducer design originally intended for use with spherical primary mirrors (published in optical engineering, February, 2003), has been adapted for use as a retro-fit for existing telescopes of similar to2m pupil diameter that have aspheric mirrors. The focal reducer has only one aspheric surface, located at the aperture stop, and can provide speeds up to f/0.75 while maintaining a wide field with pixel-limited resolution and a broad spectral passband. Examples have been computed for Ritchie-Chretien, Dall-Kirkham and Cassegrain systems, and for use at the prime focus of mirrors with non-zero conic constants.

关键词： focal reducer high speed high resolution wide angle broad spectral passband retrofit telescopes

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Modeling of polychromatic MTF losses due to secondary effects in diffractive lenses

Modeling of polychromatic MTF losses due to secondary effect...

引用

conference on current developments in lens design and optical engineering VIII

作者： Thorpe, Michael D. Jonas, Reginald P. Szapiel, Stanislaw ELCAN Opt Technol 450 Leitz Rd Midland ON L4R 5B8 Canada

ISBN: (纸本)9780819468154

Although hybrid (i.e. refractive-diffractive) surfaces are in common use in optical design there are several phenomena which affect design MTF that are not routinely modeled in current commercial versions of optical desig,n software. Typically the details of the diffractive structure are not taken into account and rays are traced through the hybrid surface employing a vector grating equation which uses the phase gradient associated with the diffractive definition to calculate a local grating spacing and orientation and from this grating information a 'diffracted ray' angle. This geometrical-optics based procedure has limitations;(I)it considers only the design diffraction order, (2)it does not take into account the sub-aperturing effect whereby color correction is reduced along, with zone count, and (3) the model used does not generate an exact blaze profile. In this paper we discuss progress in application of diffraction-based beam propagation tools in combination with a physical definition of the diffractive structure to more accurately model these secondary effects on design MTF. Results are given for some simple lenses and also the effects to be expected for a more complex zoom lens.

关键词： lens design lenses

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design and Prototyping of a Freeform Light-Guide for Automotive Lighting 19

Design and Prototyping of a Freeform Light-Guide for Automot...

引用

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

作者： Brand, Audrey C. Alisafaee, Hossein Rose Hulman Inst Technol Dept Phys & Opt Engn 5500 Wabash Ave Terre Haute IN 47803 USA

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

We have designed a light-guide for lighting applications, including automotive headlamps. The light-guide is designed based on a free-form slab. Our intention has been to optimize the design for creating legal patterns. One of our objectives has been to investigate how the changes in the shape of the freeform light-guide affects the light pattern, and how the light source geometry affects the design. For prototyping purpose, we use a particular polymer that exhibits optical performance close to acrylic (PMMA).

关键词： Automotive Lighting Lighting Light-guide optical design Illumination

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Theoretical considerations in radiometer design

Theoretical considerations in radiometer design

引用

conference on current developments in lens design and optical engineering XIV

作者： Suarez-Romero, Jose G. Salas-Zuniga, Roberto Inst Tecnol Queretaro Av Tecnol SN Esc Escobedo Queretaro 76000 Qro Mexico Ctr Ingn & Tecnol SC Queretaro 76090 Qro Mexico

ISBN: (纸本)9780819496911

This work considers typical radiometers that measure the radiance of sources or of some surface (due to reflection). The most important thing in a radiometer is its optical cavity, which defines the solid angle of measurement. In case of instruments that use lenses, lens diameter and focal length define the solid angle. Radiometer design takes care that the solid angle subtended by the optical cavity be minor that the solid angle subtended by the source to be measured, however no considerations are taken on the length of the cavity. In this work it is discussed theoretical limitation in the design of radiometers, particularly the influence of radiometer length (the cavity length). Theory of partial coherence is used to obtain the instrument function and to show how the length of the instrument affects measurements.

关键词： Radiometers photometers partial coherence diffraction effects radiometry photometry

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Iterative and inverse design of a segmented reflector for uniform illumination on the road 22

Iterative and inverse design of a segmented reflector for un...

引用

conference on current developments in lens design and optical engineering XXII

作者： Wu, Rubing Alisafaee, Hossein Rose Hulman Inst Technol Dept Phys & Opt Engn 5500 Wabash Ave Terre Haute IN 47803 USA

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

We demonstrate an iterative and inverse design of a segmented reflector used to illuminate the road with a uniform light distribution and reduced glare to the oncoming traffic. design is set to meet the StVZO standard. The maximum brightness obtained is 1460 candela, which is five times brighter than a conventional headlamp of urban shared electric scooters and bicycles, resulting in improved visibility in dark environments. A prototype was built and tested at various environments. The tolerance analysis showed no negative influence on the desired standard light distribution. In addition to this iterative approach, a ray tracing code has been developed for inverse design and to map a desired uniform road illumination pattern back to the candela sensor for corresponding reflector design.

关键词： optical design Illumination Reflector design design for manufacturing Lucid-Shape

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Minimizing gravity sag of a large mirror with an inverted Hindle-mount

Minimizing gravity sag of a large mirror with an inverted Hi...

引用

conference on current developments in lens design and optical Systems engineering

作者： Robinson, DW NASA Goddard Space Flight Ctr Greenbelt MD 20771 USA

ISBN: (纸本)0819437387

A method of minimizing the optical distortion from gravity sag on a suspended large autocollimating flat mirror has been devised. This method consists of an inverted nine-point Hindle-Mount. A conventional Hindle-Mount is located underneath a sky-viewing mirror and is primarily under compression loads from the weight of the mirror. It is not suitable for the situation where the mirror is viewing the ground, since a mirror would tend to fall out of the mount when in an inverted position. The inverted Hindle-Mount design consists of bonded joints on the backside of the mirror that allow the mirror to be held or suspended above an object to be viewed. This ability is useful in optical setups such as a calibration test where a flat mirror is located above a telescope so that the telescope may view a known optic.

关键词： Hindle mount optical mounting techniques bonding epoxy cell

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Analysis of opto-mechanical performance of a tunable liquid lens

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

引用

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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