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

共 444 条记录，以下是141-150 订阅

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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...

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

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

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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 ...

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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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Proceedings of SPIE: current developments in lens design and optical engineering III

Proceedings of SPIE: Current Developments in Lens Design and...

引用

current developments in lens design and optical engineering III

This Volume 4767 of the conference proceedings contains 19 papers. Topics discussed include optical system, optical sensors, optical materials, optical design and optical devices.

关键词： optical engineering

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Progress in the SMS design method for imaging optics

Progress in the SMS design method for imaging optics

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conference on current developments in lens design and optical engineering XII/Advances in Thin Film Coatings VII

作者： Lin, Wang Benitez, Pablo Minano, J. C. Infante, Jose Biot, Guillermo Univ Politecn Madrid CEDINT E-28040 Madrid Spain

ISBN: (纸本)9780819487384

In this work, two SMS algorithms are presented for an objective design with different selected ray-bundles: three meridian ray-bundles (3M) and one meridian and two skew ray-bundles (1M-2S), the latter from pin hole point of view, provides a better sampling of the phase space. Results obtained with different algorithms will be compared.

关键词： SMS method telephoto lens Meridian ray-bundle Skew ray-bundle imaging system

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Wide angle lens with improved relative illumination characteristics 11

Wide angle lens with improved relative illumination characte...

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conference on current developments in lens design and optical engineering XXI

作者： Zhuang, Zhenfeng Dallaire, Xavier Parent, Jocelyn Roulet, Patrice Thibault, Simon Immervision 2020 UnivSuite 2320 Montreal PQ H3A 2A5 Canada Univ Laval Ctr Opt Photon & Laser Dept Phys Genie Phys & Opt 2375 Rue Terrasse Quebec City PQ G1V 0A6 Canada

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

Consumers nowadays have a higher expectation on cameras beyond the function of taking photos or videos. In the early years, the applications of cameras with lenses were, however, very restricted. A new generation of super wide-angle lenses capture the user's surroundings in full 360 degrees, allowing the user's friends or families to step inside our universe and experience it, live. However, for such wide angle lens coverage, the relative illumination of the lens must take the vector nature of the light into account. Consequently, the polarization of light becomes a critical parameter. Custom coatings are commonly spread on the lens surface to avoid light transmission polarization falloff. But for consumer applications, complex coating is not a practical solution because it raises cost. In this paper, we present how to take care of the polarization during the design and analysis of the lens design. Additionally, design tips are proposed to suppress the polarization impact.

关键词： 080.3620) lens system design (120.4820) optical systems (260.5430) Polarization (080.2740) Geometric optical design (220.1250) Aspherics

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lens centering by using binary phase grating

Lens centering by using binary phase grating

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conference on current developments in lens design and optical Systems engineering

作者： Lu, ZW Weng, ZC Changchun Inst Opt & Fine Mech State Key Lab Appl Opt Changchun 130022 Peoples R China

ISBN: (纸本)0819437387

By using a binary phase grating, a lens centering system is constructed. In our system, the lens under alignment is mounted on a suitable mechanical axis that can be a spindle of precision lathe. A binary phase grating is used as a beam splitter. Laser beam after passing through the grating only +/- 1 orders are kept unstop, reflected back by lens surface, recombined by the same grating, and very good contrast interference fringes can be attained. When the lens together with the spindle is rotated, the interference fringes remain motionless only when the lens rotates around its axis of symmetry. If the lens rotates around an axis of asymmetry, the fringes will move. A CCD camera is used to monitor the fringes and transversal error less than a micrometer can be achieved. The interference fringes are very insensitive to vibration and environment. In the paper the theory are presented and the experimental results are given.

关键词： centering interference binary phase grating

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