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

共 446 条记录，以下是181-190 订阅

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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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Retina projection using curved lens arrays 17

Retina projection using curved lens arrays

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conference on current developments in lens design and optical engineering xvII

作者： Yen, Hao-Ren Su, Guo-Dung J. Natl Taiwan Univ Grad Inst Photon & Optoelect 1 Roosevelt RdSect 4 Taipei Taiwan

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

In this paper, we propose a multi-channel imaging system which combines the principles of an insect's compound eye and optical cluster eye. The system consists of two curved structure lens arrays with different pitches. Both of them have the same curvature and the radiuses of the lenses in the arrays are optimized to focus rays on the retina. The optical axes of different channels are tilted to each other in order to reduce the optical system volume and transmit a wide field of view. Each channel of an array of multiple optical system transfers only a part of the field of view. Each partial image passes through each channel and stitches together on the retina to reconstruct a complete image. In order to simulate the image stitching, we also build an eye model. The thickness from the panel to the last surface of lens group is less than 25mm. The panel size is designed to be 4 inch which is the scale of eyeglass. The system can provide a large field of view about 150 degrees which is much wider than the commercial products. By using the 3D printer, we can make a model of lens array to achieve our design.

关键词： head-mounted display lens arrays

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NEW-TYPE PSEUDORANDOM POSITION optical ENCODER WITH SUBMICROMETER RESOLUTION - design AND CHARACTERIZATION 4

NEW-TYPE PSEUDORANDOM POSITION OPTICAL ENCODER WITH SUBMICRO...

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conference on current developments in optical design and optical engineering IV

作者： DURANA, M MILES, R ROBERT, P SWISS FED INST TECHNOL INST METROLDEPT ELECT ENGNCH-1015 LAUSANNESWITZERLAND

ISBN: (纸本)0819415871

The characteristics of a new twin-track absolute position optical encoder are presented. One track containing a pseudorandom code and the second a periodic pattern are synchronously engraved on a glass slab. The optical reading head design composed of a LED, a gradient index lens and a linear CCD array, with simple intensity-based signal processing to read the code pattern is described in detail. This design is combined with a standard Moire method to enhance resolution. Performance enhancement of the optical reading head is studied in terms of track illumination versus code density, detector geometry versus the lens point-spread function (Airy disk);and reduction of extrinsic spatial noise by the application of thick films. Each parameter was considered in terms of the optimal field of view and depth of field of the system. © 1994 SPIE. All rights reserved.

关键词： ABSOLUTE POSITION ENCODERS PSEUDORANDOM CODES optical MEASUREMENTS INSTRUMENTATION

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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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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...

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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...

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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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Widely tunable large area thin liquid crystals lens 23

Widely tunable large area thin liquid crystals lens

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conference on current developments in lens design and optical engineering XXIII Part of SPIE Optics and Photonics conference

作者： Garcia, Javier Pereiro Cano-Garcia, Manuel Arregui, Xabier Quintana Oton, Jose Manuel Vela, Carlos Carrasco de la Rosa del Val, Pablo Geday, Morten Andreas Univ Politecn Madrid CEMDATIC ETSI Telecomunicac Ave Complutense 30 ES-28040 Madrid Spain

ISBN: (纸本)9781510654198;9781510654181

Reconfigurable diffractive lenses manufactured in liquid crystal are presented. The lenses show an unprecedented performance in terms of active diameter and focal distance range when compared to any other transparent adaptive lens. The lenses are characterized by an active area free of electronic components, with a fill factor of 98% which combined with a low operating voltage (<10V(rms)), open for applications ranging from eye contact lenses to space applications. The addressing of the liquid crystal is done exclusively from the periphery of the device. The lenses are based on tunable spiral diffractive lenses (SDL) for which the focal length may be changed by changing the topological charge, i.e. twist of the spiral in the lens. The twist in the resulting wavefront is eliminated by cascading two spiral plates with opposite twists emulating a conventional diffractive lens. The presented lenses have a tuning range from -2 to +2 diopters and an active diameter of 25mm.

关键词： Liquid Crystal flat lens adaptive optics diffractive optics optical vortex optical angular momentum

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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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Third-order aberration solution using aberration polynomials for a general zoom lens design

Third-order aberration solution using aberration polynomials...

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conference on current developments in lens design and optical engineering VIII

作者： An, Hyun Kyoung Rayces, Juan L. Reardon, Patrick J. Univ Alabama Ctr Appl Opt Huntsville AL 35899 USA JL Rayces Consulting Tucson AZ 85718 USA

ISBN: (纸本)9780819468154

A mathematical approach for the third order solution for a general zoom lens design is proposed. The design starts with a first-order layout. lens elements with the proper refracting power are placed at the proper distances to meet the physical constraints of the intended lens system. For the third-order design stage, a matrix notation called "Aberration Polynomial," which clarifies the linearity of the transformation from a normal thin group configuration to a general thin,group configuration by pupil shift and conjugate shift theory is implemented. The purpose of the method is correcting low-order aberrations during the preliminary design of zoom lenses. The goal is to mathematically reduce to zero the four aberration coefficients of the third-order (spherical aberration, coma, astigmatism, and distortion) rather than searching for a minimum by commercial design software. Once this theory is proven and accepted, it becomes possible to determine how many groups are needed for a particular optical system. The method of aberration polynomials establishes the number of groups needed to correct a given number of aberrations at a Given number of zoom positions. Furthermore, it provides the shape or bending of the elements, from where it will be possible to continue to optimize with standard methods.

关键词： Zoom lenses Monochromatic aberrations lens design Chemical elements Distortion Astatine Patents Geometrical optics Spherical lenses optical engineering

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