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

共 475 条记录，以下是211-220 订阅

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Finding starting points analytically for optical system optimization

Finding starting points analytically for optical system opti...

引用

conference on current developments in lens design and optical engineering Xiii

作者： Bociort, F. van Grol, P. Delft Univ Technol Opt Res Grp NL-2628 CJ Delft Netherlands

ISBN: (纸本)9780819492036

Understanding the structure of the design space in optical system optimization is difficult, because common human intuition fails when it encounters the challenge of high dimensionality, resulting from the many optimization parameters of lens systems. However, a deep mathematical idea, that critical points structure the properties of the space around them, is fruitful in lens design as well. Here we discuss simple systems, triplets with curvatures as variables, for which the design space is still simple enough to be studied in detail, but complex enough to be non-trivial. A one-to-one correspondence between the possible design shapes and the critical points resulting from a simplified model based on third-order spherical aberration within the framework of thin-lens theory could lead in the future to a new way to determine good starting points for subsequent local optimization.

关键词： saddle point critical point global optimization optical system design

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Analytic free-form lens design for imaging applications with high aspect ratio

Analytic free-form lens design for imaging applications with...

引用

conference on current developments in lens design and optical engineering Xiii

作者： Duerr, Fabian Benitez, Pablo Minano, Juan Carlos Meuret, Youri Thienpont, Hugo Vrije Univ Brussel Fac Engn Sci Brussels Photon Team B PHOT TONA FirW B-1050 Brussels Belgium

ISBN: (纸本)9780819492036

A new three-dimensional analytic optics design method is presented that enables the coupling of three ray sets with only two free-form lens surfaces. Closely related to the Simultaneous Multiple Surface method in three dimensions (SMS3D), it is derived directly from Fermat's principle, leading to multiple sets of functional differential equations. The general solution of these equations makes it possible to calculate more than 80 coefficients for each implicit surface function. Ray tracing simulations of these free-form lenses demonstrate superior imaging performance for applications with high aspect ratio, compared to conventional rotational symmetric systems.

关键词： Mathematical methods in physics geometric optical design and lens design free-form optics

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Graphically selecting optical components and housing material for color correction and passive athermalization

Graphically selecting optical components and housing materia...

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conference on current developments in lens design and optical engineering Xiii

作者： Schwertz, Katie Dillon, Dan Sparrold, Scott Edmund Opt Tucson AZ USA

ISBN: (纸本)9780819492036

This paper will demonstrate a graphical method for selecting a pair of optical components to simultaneously achromatize and passively athermalize an imaging lens for use in a housing with a particular coefficient of thermal expansion. The effort will be presented for a generic spectrum, so readers may apply the method to whatever waveband and set of materials that are of interest. The term "component" is used in place of "material" since this paper will explore combinations of refractive and diffractive optics. The method for creating an achromat with two refractive materials will be reviewed. To create an athermal doublet, or lens that does not change focus under temperature changes, the same color equations are used with a slight modification to include housing thermal effects. The paper will culminate by demonstrating how a set of two materials can be used to both color correct and passively athermalize a single lens;these materials can be quickly chosen to match a particular housing material via nomograph. A sample chart for a common waveband will be demonstrated.

关键词： lens design optical design passively athermal thermal defocus achromatic graphic solution

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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...

引用

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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Reflaxicon objectives for imaging

Reflaxicon objectives for imaging

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conference on current developments in lens design and optical engineering Xiii

作者： Nadorff, Georg DeWitt, Frank CVI Melles Griot Rochester NY 14620 USA

ISBN: (纸本)9780819492036

We introduce a novel application of reflective axicon surfaces to high performance image-forming objectives. The reflective surfaces are arranged such that the optical and mechanical axes are collinear, yet have the potential to provide unobscured transmission. Offering the ability to compete with the performance of traditional diffraction-limited unobscured optical systems provides a design and fabrication alternative where demanding optical requirements must be met. There are four possible arrangements for construction, with the two outer reflectors always being concave and the two inner reflectors being either concave or convex. Multitudes of novel design forms are explored. We describe monolithic and two-piece solid, two- and three-piece reflective, and two- piece hollow-solid hybrids. We analyze the performance of such designs and compare to the performance of both refractive and reflective systems.

关键词： reflective axicon lens forms objective Schwarzschild obscuration-free obscured long working distance

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Gain in optical Coatings

Gain in Optical Coatings

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conference on current developments in lens design and optical engineering Xiii

作者： Macleod, Angus Clark, Christopher Thin Film Ctr Inc Tucson AZ 85716 USA

ISBN: (纸本)9780819492036

The introduction of gain into an optical medium is most easily accomplished by reversing the sign of the extinction coefficient. The theoretical expression for reflectance at a simple boundary between a dielectric, lossless incident medium and a medium with a finite extinction coefficient, however, takes no account of the sign of the extinction coefficient In such an arrangement, therefore, can the presence of gain possibly result in an enhanced reflectance? Opinions in the literature differ but tend to find enhancement beyond the critical angle and none below. This study examines both cases and shows that all results are in fact correct but they are not necessarily stable and it is their stability, or lack of it, that leads to the different results.

关键词： Gain in optical coatings optical coating theory admittance loci with gain

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design and fabrication of imaging optical systems with freeform surfaces

Design and fabrication of imaging optical systems with freef...

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conference on current developments in lens design and optical engineering Xiii

作者： Zhang Xin Zheng Ligong He Xin Wang Lingjie Zhang Feng Yu Shuqin Shi Guangwei Zhang Binzhi Liu Qiang Wang Tongtong Changchun Inst Opt Key Lab Opt Syst Adv Mfg Technol Changchun 130033 Peoples R China

ISBN: (纸本)9780819492036

Freeform surfaces provide more degrees of freedom for design of optical systems, and enhance the ability of compensation and correction aberrations. Freeform surfaces are of advantage to balance the unsymmetrical aberrations, especially for the wide-field off-axis optical systems. This paper focus on an off-axis reflective optical system, which focal length is 550mm, F# is 6.5 and field of view (FOV) is 76 degrees. The system adopts some freeform surfaces. We discuss the problems we noticed in processes of design, manufacture, measurement and alignment, and the solutions. At last, the periodical research result and the expected performance are given.

关键词： Freeform surfaces aberrations correction off-axis reflective optical system wide FOV

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Thermal optical Path Difference Analysis of Off-Axis lens Ray Trace Foot-Print at Cassegrain telescope correct lens assembly

Thermal Optical Path Difference Analysis of Off-Axis Lens Ra...

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conference on current developments in lens design and optical engineering Xiii

作者： Hsu, Ming-Ying Lin, Yu-Chuan Chan, Chia-Yen Lin, Wei-Cheng Chang, Shenq-Tsong Huang, Ting-Ming Natl Appl Res Labs Instrument Technol Res Ctr Hsinchu 300 Taiwan

ISBN: (纸本)9780819492036

The Cassegrain telescope system in this study, is discussion correct lens thermal OPD (optical Path Difference) effect optical performance. The correct lens assembly are includes several components such as correct lens, lens mount, spacer, mount barrel and retainer. The heat transfer from surrounding to the correct lens barrel will causes optical system aberration. Meanwhile, the off-axis rays path of the OPD must consider lens incidence point and emergence point. The correct lens temperature distribution is calculate the lens barrel heat transfer analysis, the thermal distortion and stress are solve by FEM (Finite Element Method) software. The temperature calculation results can be weighting to each incidence ray path and calculate thermal OPD. The thermal OPD on Z-direction can be fitted by rigid body motion and Zernike polynomial. The fitting results can be used to evaluate the thermal effect on correct lens assembly in telescope system.

关键词： OPD FEM Ray trace Off-axis Correct lens

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Color mixing collimating lamp based on RGB LEDs

Color mixing collimating lamp based on RGB LEDs

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conference on current developments in lens design and optical engineering Xiii

作者： Lo, Yi-Chien Moreno, Ivan Chiu, Bo-Chun Chien, Wei-Ting Cai, Jhih-You Chang, Yu-Yu Sun, Ching-Cherng Natl Cent Univ Inst Lighting & Display Sci Dept Opt & Photon Chungli 320 Taiwan

ISBN: (纸本)9780819492036

A novel light luminaire is proposed and experimentally analyzed, which efficiently mixes and projects the tunable light from red, green and blue (RGB) light-emitting diodes (LEDs). Simultaneous light collimation and color mixing is a challenging task because most collimators separate colors, and most color mixers spread the light beam. We performed an experimental study to find a balance between optical efficiency and color uniformity by changing light recycling and color mixing.

关键词： LED color mixing color uniformity optical efficiency luminaire

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design and development of bi-directional Viewer

Design and development of bi-directional Viewer

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conference on current developments in lens design and optical engineering Xiii

作者： Yu, Zong-Ru Ho, Cheng-Fang Liu, Annie Lee, Tai-Wen Lin, Wen-Lung Hsu, Wei-Yao Natl Appl Res Labs Instrument Technol Res Ctr Hsinchu 300 Taiwan

ISBN: (纸本)9780819492036

Bi-directional viewer just likes a lens of camera. Unlike conventional camera lens, the bi-directional viewer captures not only front view but also side view around the bi-directional viewer. The barrel of bi-directional viewer was designed to have cuts in the side to allow side light to come through, and we use two aspherical mirrors to receive and change the side light to converge on the main optical path. The front view and side view can be imaged simultaneously on an image sensor. Commercial aspherized achromatic lens and micro video lens were also used to keep the image quality and miniaturize the size of the bi-directional viewer respectively. We report on the development of bi-directional viewer, including optical design, optical simulation, optomechanics design, fabrication techniques, assembly procedure and performance testing. The MTF of the bi-directional viewer is also measured and discussed in this paper. We successfully design and realize a bi-directional viewer, which can perform 100 lp/mm spatial frequency image in detail above 20% contrast in the 7.6 mm front view area. And we keep the dimensions of this device within 35 mm in total length and phi 20 mm in diameter.

关键词： Bi-directional viewer Side view MTF Catadioptric Dual-view

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