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

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optical design, SIMULATION AND TESTING OF AN ADDRESSABLE 64X64 LIQUID-CRYSTAL PHASE PLATE

OPTICAL DESIGN, SIMULATION AND TESTING OF AN ADDRESSABLE 64X...

引用

conference on current developments in optical design and optical engineering III

作者： PURVIS, A BAILEY, NJ LOVE, GD MAJOR, JV UNIV DURHAM SCH ENGN & COMP SCIDURHAM DH1 3LEENGLAND

ISBN: (纸本)081941249X

The correction of phase aberrations in optical systems using an adaptive liquid crystal phase screen having 64 X 64 pixels is considered. These adaptive components have advantages over deformable mirror systems in that liquid crystal technology is relatively inexpensive and large pixelation densities can be achieved. In particular we address the application of these devices to astronomical adaptive optics. A simulator of the phase correction plate at work using time changing distorted wave fronts is described. Preliminary measurements of the optical flatness and response times of the prototype device are discussed.

关键词： Liquid crystals Adaptive optics optical simulations optical design Prototyping Wavefronts Astronomical adaptive optics Atmospheric modeling Device simulation Switches

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WIDE-BAND MONITORING OF optical COATINGS WITH DEPOSITION ERROR-CORRECTION

WIDE-BAND MONITORING OF OPTICAL COATINGS WITH DEPOSITION ERR...

引用

conference on current developments in optical design and optical engineering III

作者： WU, PY GU, PF TANG, JF ZHEJIANG UNIV DEPT OPT ENGNHANGZHOU 310027PEOPLES R CHINA

ISBN: (纸本)081941249X

The manufacture of complex multilayers requires the maker to have a satisfactory monitoring system. The monitoring system can control accuracy not only in optical thicknesses of nonquarterwave layers but can also compensate deposition errors in real-time in order to secure a stable monitoring and eventually to achieve the desired optical performance. In this paper, a computer controlled apparatus for monitoring of wideband optical coatings is described. A method, based on performance measurements during the monitoring of a layer in situ, has been developed to determine the actual refractive index and thickness of the layer in vacuo. The method can be used as a means of detecting deposition errors.

关键词： Multilayers optical coatings Reflectivity Optics manufacturing Control systems Osmium Error analysis Feedback control In situ metrology Refractive index

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design and testing of a refractive reshaping system

Design and testing of a refractive reshaping system

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current developments in optical design and optical engineering III

作者： Jiang, Wu Shealy, David L. Martin, James C. Univ. of Alabama/Birmingham Birmingham AL USA

ISBN: (纸本)081941249X

For many illumination applications, it is desirable for a laser beam to have a uniform irradiance distribution across its diameter. Refractive and reflective systems for reshaping a laser beam profile have been proposed and discussed for many years. One of the refractive systems consisting of two plano-aspherical lenses operates with high efficiency. Recently, a prototype of this two aspherical lens reshaping system has been made from CaF2. The performance of the prototype is presented in this paper. The optical design and analysis of this system also are discussed.

关键词： Laser beams

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SOLID MODELING OF optical-COMPONENTS AND RAY-TRACING

SOLID MODELING OF OPTICAL-COMPONENTS AND RAY-TRACING

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conference on current developments in optical design and optical engineering III

作者： FINKLER, R OPTRAM LTD IL-43106 RAANANAISRAEL

ISBN: (纸本)081941249X

optical systems are traditionally represented by a sequential series of `optical surfaces' that are ordered in the same manner experienced by light traveling from an object to an image point through the system. The actual system is composed of 3-D components which include these `active optical surfaces' as the external surface of the component. Modern simulation technology is based on solid modeling which provides a very close representation to the actual system and enables computer integrated manufacturing by being accurate and comprehensive enough for fabrication. The classical method to analyze an optical system is based on ray tracing, a technique based on geometrical optics where light propagation is assumed to be simulated by rays from the object to the image point. Each ray is represented by a linear vector traveling through the system to the evaluation plane by iterations. Each step calculates the propagation between two successive surfaces in a sequential order. The shift from `sequential surfaces' representation to `solid models,' which changes the classical method of ray tracing, but offers a variety of new analytical opportunities, is discussed.

关键词： Ray tracing Solids Geometrical optics Optics manufacturing Solid modeling optical components 3D modeling Data modeling systems modeling Visualization

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Aberration balancing in the design of visually coupled lens systems

Aberration balancing in the design of visually coupled lens ...

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current developments in optical design and optical engineering III

作者： Mouroulis, Pantazis Z. Lyons, Kevin P. Zhao, Guoheng Rochester Inst. of Technology Rochester NY USA

ISBN: (纸本)081941249X

In the first part of this paper, we examine previously used methods for the assessment of the subjective performance of lenses coupled to the eye, we establish the need for a unified means of assessment in terms of visual tasks and targets, and we propose such a means. In the second part, we address some common aberration balancing questions, with a view to presenting concrete recommendations for optical design. The balancing questions examined are: defocus and accommodation, accommodation and longitudinal color, spherical aberration and defocus, astigmatism and field curvature, field curvature and accommodation, transverse color and astigmatism, and coma and astigmatism.

关键词： lenses

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MICROPROCESSOR-CONTROLLED SENSOR WITH MULTIPLE LIGHT-SOURCES FOR ACQUISITION SPATIAL INFORMATION

MICROPROCESSOR-CONTROLLED SENSOR WITH MULTIPLE LIGHT-SOURCES...

引用

conference on current developments in optical design and optical engineering III

作者： LIU, XL BEIJING INST TECHNOL DEPT OPT ENGNBEIJING 100081PEOPLES R CHINA

ISBN: (纸本)081941249X

A simple microprocessor controlled optical sensor is proposed in this paper. It can measure two kinds of optical information: the distance between sensor and the illuminated area of the object and the inclination angles of that area. Under the control of the microprocessor, the sensor can also profile a full 360 degree(s) 3-D picture of the object by scanning a scene mechanically in vertical dimension and rotating the object to be measured in the horizontal plane. The proposed sensor has been assembled and some preliminary experiments show that it can sense the distance with a range of 10 cm in accuracy of +/- 1 mm for objects having diffuse reflectivity and the inclination angles of the area with a range of +/- 20 degree(s) with accuracy of 1.5 degree(s). A shape of a mannequin head is profiled in a full 360 degree(s) way.

关键词： Sensors Phase shifts Signal detection Distance measurement Light sources Modulation Diodes Control systems Head Data acquisition

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New compact Xenon flash system for zoom lens and close-up photography

New compact Xenon flash system for zoom lens and close-up ph...

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current developments in optical design and optical engineering III

作者： Cheng, Dah Y. Cheng Technology & Services Los Altos CA USA

ISBN: (纸本)081941249X

The new Intense Point Source (IPS) consists of the regular linear Xenon flash tube mounted in a newly patented Orthogonal Parabolic Reflector (OPR) (Patent No. 5,037,191). The system integrates the radiation for the long linear lamp into a very small point on the order of 3 to 6 millimeters in diameter, with a 90° divergent angle. A diffuser and lens systems are employed to provide either a narrow beam of a few degrees for long range photography or a diffused light for close-up photography to provide softened, penetrating lighting. Light intensity distribution data for the new flash system as compared to that of the original Vivitar 285 flash lamp as measured in the Vivitar lab, are presented.

关键词： Flashlights

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Four- foci slanted axis Fresnel lens for planar optical perfect shuffle

Four- foci slanted axis Fresnel lens for planar optical perf...

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optical Computing, OC 1993

作者： Carey, C.D. Selviah, D.R. Midwinter, J.E. Song, S.H. Lee, E.H. Department of Electronic and Electrical Engineering University College London Torrington Place LondonWCIE 7JE United Kingdom Electronics and Telecommunications Research Institute Research Department P.O.Box 8 Daedog Science Town Daejon350-606 Korea Republic of

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NEW design METHOD FOR ATHERMALIZED optical-systems

NEW DESIGN METHOD FOR ATHERMALIZED OPTICAL-SYSTEMS

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CONF ON current developments IN optical design AND optical engineering 2

作者： TAMAGAWA, Y WAKABAYASHI, S TAJIME, T Mitsubishi Electric Corp. (Japan)

ISBN: (纸本)0819409251

This paper describes a new design method for athermalized optical systems. It can be accomplished by combining optical materials and by selecting suitable lens powers. However, there are difficulties in determining material and power of each lens, because achromatism is simultaneously required. To determine the condition of eliminate thermal focus shift and longitudinal chromatic aberration easily by simple drawing, an athermal chart is proposed which is constructed by plotting chromatic dispersive power and thermal dispersive power on a cartesian coordinate system.

关键词： Modulation transfer functions Zinc Colorimetry Germanium Chromatic aberrations Temperature metrology Visualization Gallium arsenide Refractive index Thermography

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lens BLOCKING METHOD FOR OPTICAM

LENS BLOCKING METHOD FOR OPTICAM

引用

CONF ON current developments IN optical design AND optical engineering 2

作者： NOVAK, R MARRO, M TIPPS, JD CZAJKOWSKI, W DEMARCO, J SALAMON, PA MATCHETT, D CAPUTO, F LEBLANC, G Monroe Community College (United States) Eastman Kodak Co. (United States) Loctite Corp. (United States)

ISBN: (纸本)0819409251

A uv-curing 'cold' blocking adhesive has been developed by Loctite Corporation for use with the Opticam SM. The adhesive is a significant advance in the lens blocking process, as it eliminates heat-induced blocking strain; the most significant problem encountered with current hot pitch blocking methods. The new cold blocking adhesive is complemented by a new Kennametal lens blocking adapter tool and chucking system. The tooling offers substantially improved lens adapter to machine alignment and transfer; at considerably lower cost. The lenses are deblocked in a heated water and detergent solution, eliminating the environmental concerns of the current method.

关键词： Adhesives Optics manufacturing Glasses Light sources optical alignment Precision optics Roads UV optics Computing systems optical fabrication

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