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

共 444 条记录，以下是181-190 订阅

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Plane development of lateral surfaces for inspection systems

Plane development of lateral surfaces for inspection systems

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conference on current developments in lens design and optical engineering VII

作者： Francini, F. Fontani, D. Jafrancesco, D. Mercatelli, L. Sansoni, P. Ist Nazl Ott Appl L Go E Fermi 6 I-50125 Florence Italy

ISBN: (纸本)0819463671

The problem of developing the lateral surfaces of a 3D object can arise in item inspection using automated imaging systems. In an industrial environment, these control systems typically work at high rate and they have to assure a reliable inspection of the single item. For compactness requirements it is not convenient to utilise three or four CCD cameras to control all the lateral surfaces of an object. Moreover it is impossible to mount optical components near the object if it is placed on a conveyor belt. The paper presents a system that integrates on a single CCD picture the images of both the frontal surface and the lateral surface of an object. It consists of a freeform, lens mounted in front of a CCD camera with a commercial lens. The aim is to have a good magnification of the lateral surface, maintaining a low aberration level for exploiting the pictures in an image processing software. The freeform lens, made in plastics, redirects the light coming from the object to the camera lens. The final result is to obtain on the CCD: - the frontal and lateral surface images, with a selected magnification (even with two different values for the two images);- a gap between these two images, so an automatic method to analyse the images can be easily applied. A simple method to design the freeform lens is illustrated. The procedure also allows to obtain the imaging system modifying a current inspection system reducing the cost.

关键词： optical design freeform optics industrial control optical component

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New tools for the design of freeform mirrors 18

New tools for the design of freeform mirrors

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conference on current developments in lens design and optical engineering XVIII

作者： Dilworth, Donald C. Opt Syst Design Inc POB 247 East Boothbay ME 04544 USA

ISBN: (纸本)9781510612082;9781510612075

Advances in manufacturing and measuring technology are making the use of freeform mirrors more practical than in the recent past. New degrees of freedom make it possible for designers to improve image quality while increasing the field of view and avoiding obscurations. But other issues arise when one designs a system with several mirrors, particularly packaging and clearance concerns: one must ensure that none of the mirrors gets in the way of the beam from any of the others, and one must consider the coordinate system in which the shapes are defined and in which they are measured, which are not necessarily the same. Addressing these concerns requires new computational tools.

关键词： Freeform aspheric mirrors beam clearance at mirrors

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Opto-mechanical design of primary mirror assembly for free gyro stabilized seeker

Opto-mechanical design of primary mirror assembly for free g...

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conference on current developments in lens design and optical Systems engineering

作者： Perona, BJ Yarbrough, C Prill, S Raytheon Missile Syst Co Tucson AZ 85710 USA

ISBN: (纸本)0819437387

In Free Gyroscopic Stabilized Seekers, the Primary Minor has the multiple functions of a magnetic rotor, the primary rotating mass and the primary reflector for the optical train. The introduction of rare-earth magnetic alloys to this class of seeker has provided increased flexibility in materials selection, opto-mechanical design and cost of manufacture. Along with superior magnetic properties, the rare-earth alloy Neodymium-Iron-Boron (NdFeB) comes with the undesirable properties of anisotropic CTE, high susceptibility to corrosion and manufacturing challenges. This paper discusses the opto-mechanical design, structural and optical modeling and analysis of a primary mirror assembly utilizing an NdFeB insert with centrifugal, linear acceleration and thermal loading as well as the optical test results, qualification testing of long-term figure stability and validation of the mechanical/magnetic/optical design model.

关键词： opto-mechanical design gyroscope rare-earth magnet

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design of projection-based augmented reality system using holographic screen display 23

Design of projection-based augmented reality system using ho...

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

作者： Nishikawa, Jun Nakamura, Tomoharu Sony Grp Corp R&D Ctr Atsugi TEC 4-14-1 Asahi Cho Atsugi Kanagawa 2430014 Japan

ISBN: (纸本)9781510654198;9781510654181

Holographic display elements (HOEs) with a high diffraction efficiency and size enlargement have been developed since 2019. To achieve high brightness and low haze, unprecedented optical systems have been proposed with a uniform chief ray angle of 0 degrees in the x-section and 70 degrees in the y-section of the HOEs. A 360 degrees cylindrical holographic screen display (CHSD) was obtained by providing a large tilt to the surface shape near the optical axis. This was done using a first-order odd aspherical coefficient for the light flux from a refractive optical system (RO). A flat holographic screen display (FHSD) is a compact, high-performance display that uses three decentered and tilted freeform mirrors to route light flux from the RO in a ball-like form. Prototyping also proposes the possibility of an augmented reality system that takes advantage of the high transparency. The design for further miniaturization while maintaining optical performance was also discussed, in which the size of the first mirror was reduced by reducing the half-field angle of the RO to approximately 6 degrees. Furthermore, by increasing the negative power of the second mirror, the small size could be maintained The size of the last mirror was dependent on the screen size and could not be reduced. By laying down the posture of this mirror, we were able to halve the size reduction in the vertical direction. In this paper, lens designs for CHSDs and FHSDs are reported. The potential of this display is also discussed.

关键词： Holographic optical elements augmented reality display freeform mirror projection lens lens design

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Simulation of the optical performance of refractive elements to mimic the human eye focusing 16

Simulation of the optical performance of refractive elements...

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conference on current developments in lens design and optical engineering XVI

作者： Diaz-Gonzalez, G. Santiago-Alvarado, Agustin Cruz-Felix, Angel S. Univ Tecnol Mixteca Huajuapan De Leon 69000 Oax Mexico

ISBN: (纸本)9781628417449

Refractive optics has evolved and incorporated new elements in optical systems every day, such as conventional lenses, tunable lenses, GRIN lenses, diffractive lenses, intraocular lenses, etc. Some of these elements are reported in the literature together with different proposed models of the human eye. In this work, optical properties of some of these lenses will be studied, and simulations of their behavior will be done in order to analyze which one is better for imaging process. Such lenses will be incorporated in an optical system that mimics the human eye behavior. Analysis and obtained results are reported, as well as the proposed optical system. Finally, we present the conclusions of the work.

关键词： visual optics geometric optics matrix optics tunable lenses

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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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The design and fabrication of telecentric lens with large field of view

The design and fabrication of telecentric lens with large fi...

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conference on current developments in lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Chang, Chun-Li Huang, Kuo-Cheng Wu, Wen-Hong Lin, Yi-Hung Natl Appl Res Labs Instrument Technol Res Ctr Hsinchu Taiwan Natl Pingtung Univ Sci & Technol Dept Engn Mech Pingtung Taiwan

In ultra-precision (distortion 100 mm). Based on the concept of equivalent design in optical tolerances, the lens module can be designed readily into a telecentric system, which consists of five spherical lenses and a... 详细信息

ISBN: (纸本)9780819482822

In ultra-precision (distortion <0.5%) vision inspection system, the accuracy of measurement depends on sharpness and distortion of image. The telecentric lens provides distortion-free and constant magnification (within depth of field) image, so it has become an indispensable key module in the amount of visual measuring system. The article presents a design and development of telecentric lens module for the wide range of vision inspection system (field-of-view >100 mm). Based on the concept of equivalent design in optical tolerances, the lens module can be designed readily into a telecentric system, which consists of five spherical lenses and a glass molded aspheric lens. In order to correct image distortion, an aspheric lens would be added to the telecentric system. The experiment shows that the distortion can be reduced from 1.5% to 0.34% and the depth of field (DOF) is also improved up to 28.3 mm.

关键词： telecentric lens machine-vision aspheric lens equivalent tolerance

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Self-weight distortion of lens elements

Self-weight distortion of lens elements

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conference on current developments in lens design and optical engineering VII

作者： DeWitt, Frank Nadorff, Georg Naradikian, Markar Melles Griot Opt Grp 55 Sci Pkwy Rochester NY 14620 USA

ISBN: (纸本)0819463671

Changes in the shape of large lens elements due to the influences of gravity are important to consider in the fabrication, testing and assembly of optical systems. Tried and proven methods used for mounting large mirrors to minimize the effects of gravity are typically not applicable to large transmissive lens elements, due to the simple requirement that the clear aperture of a lens must remain free of mechanical obstructions. Precautions must be taken to ensure that an element's surfaces are correctly fabricated and then maintained when assembled into the final system. The amount of distortion caused by the weight of a particular lens element is dependent on a number of factors including: size, aspect ratio, shape, material, and the support on which it rests. Examples of the effects of these factors are modeled using Finite Element Analysis and demonstrated through interferometric testing. Attention is given to the mounting of lens elements within a system and simulating "real-world" conditions. These "real-world" conditions can produce results that are different from what was expected if only ideal cases have been considered. The work presented will aid the designer, fabricator, and metrologist to identify what optical elements and mounting conditions may be problematic and to minimize their effects.

关键词： optomechanical finite element analysis self-weight distortion gravity sag optical mounting tolmncing surface irregularity

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Retina projection using curved lens arrays 17

Retina projection using curved lens arrays

引用

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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