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

共 467 条记录，以下是141-150 订阅

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design of an in-vivo microscope to characterize cataracts in human eyes 6

Design of an in-vivo microscope to characterize cataracts in...

引用

current developments in optical design and engineering VI conference

作者： Feng, C Ahmad, A Univ. of Alabama in Huntsville (United States)

ISBN: (纸本)0819422517

The design of a compact contact microscope, which can be used in-vivo to study the cataracts in human eyes is presented. This microscope has the capability to evaluate the changes in the optical density within the eye lens itself, and thus enabling an examiner to ascertain the progression of a cataractous change or at least the optical changes associated with cataractous development. The microscope has a variable focal length so it can be focused at any depth through the entire thickness of the eye lens. A separate small objective lens is spring loaded against the cornea (like a tonometer tip) so that the natural eye movements can occur safely during the examination. The distance between the objective lens and rest of the optics is variable to accommodate the movements of the eye due to pulse or breathing without affecting the image quality of the instrument. The layer by layer images can be captured on a CCD camera and stored in the computer. The reconstruction software can quantitatively display the characteristics of the cataracts, such as the location, size, and density. The optical design and performance results for the microscope are presented. The optomechanical design features of the microscope are also discussed.

关键词： in-vivo microscope contact microscope eye diseases cataracts CCD imaging

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Finite-difference method in non-orthogonal curvilinear coordinate system used for electron gun design

Finite-difference method in non-orthogonal curvilinear coord...

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conference on current developments in optical design and engineering vii

作者： Wang, C Yin, HC Xue, KX Tong, LS Southeast Univ Elect Res Inst Nanjing 210018 Jiangsu Peoples R China

ISBN: (纸本)0819428841

A Finite-Difference Method in Non-Orthogonal Curvilinear Coordinate System (FDM-NOCCS) is the combination of the domain transformation technique and the Finite-Difference Method (FDM). It has the visualization and simplification of the traditional FDM. On the other hand. it overcomes the weakness of EDM in dealing with complicated boundary shapes, averts the interpolation between the grid points in the vicinities of boundaries, and also avoids the abnormalism in the transformation from the physical domain to the computational domain. The FDM-NOCCS is used in the computer aided design of electron gun for color cathode ray tube. Compared with the formal FDM, the FDM-NOCCS can save quite a lot of CPU time and computer memory. FDM-NOCCS works well with the complicated e-gun systems design.

关键词： electron gun computer aided design finite difference method curvilinear coordinate system

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optical design of a reflectance/Raman confocal microspectrometer

Optical design of a reflectance/Raman confocal microspectrom...

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conference on current developments in lens design and optical engineering III

作者： Mouroulis, P CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)0819445347

A miniaturized instrument for systematic planetary mineralogy is presented, and the optical design of the component parts is discussed. The instrument combines the following capabilities: wide field color imaging, confocal imaging at two different resolution/range levels, reflectance spectroscopy in the 400-2500 nm region with a resolution of 10 nm, and Raman spectroscopy over 4000 cm(-1) with an average resolution of 3.3 cm(-1). The instrument can also serve as an expandable platform for adding fluorescence spectroscopy, or for examining samples from a distance of several meters while using the same spectrometer.

关键词： optical design confocal microscopy planetary mineralogy reflectance spectroscopy Raman spectroscopy

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Dynamic modeling of optical systems in order to study vibration effect on performance

Dynamic modeling of optical systems in order to study vibrat...

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

作者： Avsar, Ahmet Levent Ozguven, H. Nevzat ASELSAN Inc MGEO Headship PK 30 TR-06011 Ankara Turkey Middle E Tech Univ Dept Engn Mech TR-06531 Ankara Turkey

ISBN: (纸本)9780819482822

In order to determine the vibration effects on performance in optical system, a simple vibratory model is proposed. The model suggested is compared with FE model. Both models are validated by modal tests for an existing simple optical system. The material properties of adhesive, which play an imported role in the vibratory model of an optical system, are found experimentally by using a simple test setup. The model suggested is used to investigate the dynamic behavior of the optical system under random vibration load conditions. It is concluded in this study that the analytical model suggested can successfully be used in preliminary design stage of simple optical systems when optical housing and lens behave rigidly in the frequency range of interest.

关键词： Dynamic Analysis optical Performance optical System

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Precise algebraic method to solve the noncemented two-lens objective free from the aperture aberrations

Precise algebraic method to solve the noncemented two-lens o...

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8th conference on current developments in optical design and optical engineering

作者： Kryszczynski, T Inst Appl Opt Det Geometr Opt PL-03805 Warsaw Poland

ISBN: (纸本)0819432652

An original method to enable the exact solution for the noncemented two-lens objective by means of any number of simultaneous non-linear equations is described. The method is limited to spherical surfaces without decentrations. Separations and refractive indices of glasses are fixed. Ail curvatures of surfaces are indirectly determined in the final stage. The typical meridional aperture aberrations deal with aplanatic and achromatic conditions. Essence of the method relies on formulation functions which contain trigonometric expressions and are nested up to certain depth. The method uses the advanced professional mathematical software which is indispensable for serving the non-linear system of equations. Numerical examples confirm the helpfulness of the method.

关键词： algebraic methods of the optical design use of computer algebra to the optical design

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optical design of triple-mode seeker 11

Optical design of triple-mode seeker

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conference on current developments in lens design and optical engineering XXI

作者： Sakarya, Dogan Ugur Kucukcelebi, Doruk Tact Missile Syst Grp TR-06780 Roketsan Elmadag Ankara Turkey

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

In missile applications, new counter measure methods are getting more complex. To discriminate and detect counter measure and to understand target signature from scene is getting harder. Because of all that concerns, using triple-mode seeker for a system solution is a good solution for system total performance. By this way, tri-different wavelength could be used for same system and same scene. In this study, triple mode system's optical designs have been made for mid-wave infra-red imaging, long-wave infra-red imaging and short-wave infrared imaging. optical designs performances have been illustrated in simulation results. Finally, conceptual design of triple mode seeker will be summarized.

关键词： Triple mode seeker mid wave infrared long wave infrared short wave infrared optical design

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design and fabrication of low-cost thermal imaging optics using precision chalcogenide glass molding

Design and fabrication of low-cost thermal imaging optics us...

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conference on current developments in lens design and optical engineering IX

作者： Curatu, George LightPath Technol Orlando FL 32826 USA

ISBN: (纸本)9780819472809

Aspheric and diffractive surfaces in infrared materials are traditionally fabricated by single point diamond turning, which is a high-cost, low-throughput process, not suitable for low-cost, high-volume applications. Precision molding of chalcogenide glasses is a novel process we developed to allow the efficient fabrication of quality infrared optics in large volumes. In this paper we present the advantages and particularities of designing thermal imaging lenses for high-volume applications using precision molded chalcogenide glasses. As an example, we present a compact 19 mm F/1.1 infrared lens design for a 320 x 240 uncooled detector array operating from 8 to 14 microns. The excellent image quality and transmission of tested prototypes prove that precision molding of chalcogenide glasses is an ideal optical fabrication technology for the high-volume production of infrared optics.

关键词： infrared lens design thermal imaging precision glass molding chalcogenide glasses athermal design diffractive optics

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current status and future direction of sensors in earth observing satellites

Current status and future direction of sensors in earth obse...

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conference on current developments in lens design and optical engineering IV

作者： Zhou, GQ Wang, C Old Dominion Univ Norfolk VA 23529 USA

ISBN: (纸本)0819450464

With the increasing sensor development, smart sensor, advanced sensor, and intelligent sensor, especially, distributed sensors, sensor network and sensor integration are being taken into account for application of our environmental monitoring and Earth source investigation. This paper investigates the development of sensors in Earth observing (EO) satellites, analyzes the current high-resolution EO satellites and presents the direction of new imaging systems in future Earth observing satellite. The purpose of this paper is to contribute to those who are interested in knowing and keeping track of the details of the imaging system of earth observing satellites.

关键词： sensor network earth observing satellite future direction advanced sensor smart sensor

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ACHROMATIC ABERRATION CORRECTIONS WITH ONLY ONE GLASS 4

ACHROMATIC ABERRATION CORRECTIONS WITH ONLY ONE GLASS

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conference on current developments in optical design and optical engineering IV

作者： MALACARA, D MALACARA, Z CTR INVEST OPT AC 37000 LEONMEXICO

ISBN: (纸本)0819415871

It is well known and described in any geometrical optics textbook that the axial as well as the magnification chromatic aberration may be corrected in a system formed by a pair of thin lenses separated by a certain distance, using only one type of glass. However, it is not so well known that these aberrations may be also corrected in a single thick lens.

关键词： Chromatic aberrations lenses Glasses Geometrical optics Aberration correction optical design Refractive index

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design of Large Aperture Four Group Elements Mid-wave Infrared Zoom lens

Design of Large Aperture Four Group Elements Mid-wave Infrar...

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conference on current developments in lens design and optical engineering XIII

作者： Ji Yiqun Shi Rongbao He Hucheng Shen Weimin Soochow Univ Inst Modern Opt Technol Key Lab Adv Opt Mfg Technol Jiangsu Prov Suzhou 215006 Jiangsu Peoples R China

ISBN: (纸本)9780819492036

Zoom lens with variable focal length is well fit for researching objectives far and near. design of zoom lens working at mid-wave infrared wavelength (7.7-10.3 m) and its view field 10 degrees is presented. Determination of the initial configuration of the variable and the compensate groups are discussed according to the mechanism compensate curves. The compensate group is determined with positive power. Its focal length changes during a large scope, which is from 300mm to 100mm. And the corresponding F number variables from 3.75 to 1.25. So the residual aberration needs to be carefully corrected. The optimized zoom lens is composed of four group elements, and its performance reaches diffraction limited at each focal position.

关键词： optical design mid-wave infrared zoom lens four group elements mechanical compensate curve large aperture

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