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

共 704 条记录，以下是141-150 订阅

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Double-folded catadioptric lens for smartphone portraiture photography 7

Double-folded catadioptric lens for smartphone portraiture p...

引用

Conference on optical design and engineering vII

作者： Sheil, Conor J. Goncharov, Alexander v. Natl Univ Ireland Sch Phys Appl Opt Grp Galway Ireland

ISBN: (数字)9781510619180

ISBN: (纸本)9781510619180

Smartphones are increasingly utilising a dual-camera setup, introducing the possible use of one or more specialised camera modules. The current work presents a smartphone camera designed for portraiture. In portraiture, it is desirable to have a natural Bokeh effect, resulting from shallow depth of field (DoF). Because DoF is inversely related to the square of diameter, the proposed lens has a large entrance pupil diameter and low F-number. To fit such a camera within typical smartphone housing, the design is doubly folded, resulting in a compact z-profile (phone thickness) of less than 5 mm, with a total ray path of 13 mm. Due to physical limitations, the field-of-view (Fov) is reduced;this is acceptable, considering the specialised application of the camera and attractively large entrance pupil diameter. With a focal length of 7.6 mm, the system is retrofocus, but could be considered telephoto in terms of its z-height, when compared to typical smartphone lenses. This proof-of-concept design is demonstrated here using glasses. Axial colour is controlled using two doublets. For compactness, the aperture stop is positioned between the first doublet and first fold mirror, also allowing balancing of lateral colour and distortion. For very compact applications, a fixed-focus version of this system was designed. However, considering the large focal length and diameter, the hyperfocal distance is unattractively large;hence, a slightly longer refocussing system was also designed. Refocus is achieved by moving the the second doublet, the power of which must be increased relative to the fixed-focus design-the power increase disturbs the aberration balance about the stop, and hence lateral colour and distortion increase slightly. Distortion remains below 5% and lateral colour should be possible to correct digitally.

关键词： Portraiture catadioptric smartphone optics folded optics depth of field aspherics

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optical schemes for compact space objectives 18

Optical schemes for compact space objectives

引用

Conference on current developments in lens design and optical engineering XvIII

作者： Butylkina, K. D. Romanova, G. E. Bakholdin, A., v ITMO Univ 49 Kronverksky Pr St Petersburg 197101 Russia

ISBN: (纸本)9781510612082;9781510612075

The most widely used objectives for the space optics are mirror and catadioptric systems. We have considered several scheme types including the three-mirror schemes both of the Korsch-type and the systems without an intermediate image and compare them from the point of view of packaging conditions, image quality and achievable characteristics. The two-mirror systems with lens correctors are also analyzed. The optical layout and parameters of several variants are presented and the image quality is shown.

关键词： three-mirror systems Korsch scheme lens correctors optical systems design

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Using a two-lens afocal compensator for thermal defocus correction of catadioptric system 18

Using a two-lens afocal compensator for thermal defocus corr...

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Conference on current developments in lens design and optical engineering XvIII

作者： Ivanov, S. E. Romanova, G. E. Bakholdin, A. v. St Petersburg Natl Res Univ Informat Technol Mech 49 Kronverksky Prospekt St Petersburg 197101 Russia

ISBN: (纸本)9781510612082;9781510612075

The work associates with the catadioptric systems with two-component afocal achromatic compensator. The most catadioptric systems with afocal compensator have the power mirror part and the correctional lens part. The correctional lens part can be in parallel, in convergent beam or in both. One of the problems of such systems design is the thermal defocus by reason of the thermal aberration and the housing thermal expansion. We introduce the technique of thermal defocus compensation by choosing the optical material of the afocal compensator components. The components should be made from the optical materials with thermo-optical characteristics so after temperature changing the compensator should become non-afocal with the optical power enough to compensate the image plane thermal shift. Abbe numbers of the components should also have certain values for correction chromatic aberrations that reduces essentially the applicable optical materials quantity. The catalogues of the most vendors of optical materials in visible spectral range are studied for the purpose of finding the suitable couples for the technique. As a result, the advantages and possibilities of the plastic materials application in combination with optical glasses are shown. The examples of the optical design are given.

关键词： Afocal compensator athermalization catadioptric system optical material

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Development of surgical binoculars on the basis of polymeric lenses 18

Development of surgical binoculars on the basis of polymeric...

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Conference on current developments in lens design and optical engineering XvIII

作者： voznesenskaya, Anna Andreev, Lev Ekimenkova, Alisa ITMO Univ 49 Kronverksky Av St Petersburg 197101 Russia

The basis of this work is a modification of the modern design of surgical binoculars based on substitution of mineral glasses with polymer lenses. Aberration analyses of the proposed systems is shown.

ISBN: (纸本)9781510612082;9781510612075

关键词： polymeric lenses medical optics surgical binoculars optical system design ergonomics

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Zoom system without moving element by using two liquid crystal lenses with spherical electrode 18

Zoom system without moving element by using two liquid cryst...

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Conference on current developments in lens design and optical engineering XvIII

作者： Yang, Ren-Kai Lin, Chia-Ping Su, Guo-Dung J. Natl Taiwan Univ Grad Inst Photon & Optoelect 1Roosevelt RdSect 4 Taipei Taiwan

ISBN: (纸本)9781510612082;9781510612075

A traditional zoom system is composed of several elements moving relatively toward other components to achieve zooming. Unlike tradition system, an electrically control zoom system with liquid crystal (LC) lenses is demonstrated in this paper. To achieve zooming, we apply two LC lenses whose optical power is controlled by voltage to replace two moving lenses in traditional zoom system. The mechanism of zoom system is to use two LC lenses to form a simple zoom system. We found that with such spherical electrodes, we could operate LC lens at voltage range from 31v to 53 v for 3X tunability in optical power. For each LC lens, we use concave spherical electrode which provide lower operating voltage and great tunability in optical power, respectively. For such operating voltage and compact size, this zoom system with zoom ratio approximate 3: 1 could be applied to mobile phone, camera and other applications.

关键词： replication process liquid crystal lens zoom system

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Tunable refraction power by mutual rotation of helical lens parts 18

Tunable refraction power by mutual rotation of helical lens ...

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Conference on current developments in lens design and optical engineering XvIII

作者： Sieber, Ingo Martin, Thomas Stiller, Peter Karlsruhe Inst Technol Inst Appl Comp Sci Hermann von Helmholtz Pl 1 D-76344 Eggenstein Leopoldshafen Germany

ISBN: (纸本)9781510612082;9781510612075

This paper presents a refractive optical system consisting of two lens bodies with helical surface structures, which allows for tuning the optical refraction power by means of a mutual rotation of the lens bodies around the optical axis. Thus, the refraction power can be tuned continuously in a certain range. The helical surfaces are shaped by changing the radius of curvature as a function of to the polar angle. Combination of such two surfaces results in an optics with refraction power being tunable by a mutual rotation. This optical system is multifocal with at least two sectors with different individually tunable refraction powers. To obtain a monofocal rotation optics, obscuration of one of the lens sectors is necessary. Conventional lens systems providing tunable refraction power do so by mutual axial or lateral shift of the lenses or the lens parts. Hence, additional space for lens movement is needed in the mechanical design. Since the rotational optics allows for adjustment of the refraction power by a mutual rotation of the lens parts, no displacement of lenses is needed and a more compact design is obtained.

关键词： Freeform optics varifocal optics rotation optics

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The improved optical setup for Abbe-Porter experiment 18

The improved optical setup for Abbe-Porter experiment

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Conference on current developments in lens design and optical engineering XvIII

作者： Borovytsky, v. Hudz, O. Antonenko, v. Natl Tech Univ Ukraine Igor Sikorsky KPI Opt Engn Dept Pr Peremogy 37 UA-03056 Kiev Ukraine

ISBN: (纸本)9781510612082;9781510612075

The interesting experiments for investigation of image formation in optical microscopes have been done by E. Abbe, A. Porter and L. Mandelshtam. These experiments have become the classical ones and they are widely used for explanation of Fourier optics. The principal disadvantage of them is difference in optical schemes for observation of object images and their spatial spectrums. The proposed optical setup makes possible demonstration of two stages of image formation - obtaining a spatial spectrum and composing a magnified object image - together in one plane. This setup contains two imaging channels separated by a beam splitter after a microscope objective. The first one forms a magnified object image, the second one - an image of a spatial spectrum. These images may be observed on a screen, via eyepieces or using image sensors. Any occluding of spectrum zones becomes visible and it leads to the corresponded changes in an object image. This optical setup would be useful for optical education and research.

关键词： Abbe-Porter experiment Abbe theory Fourier optics image formation microscopy resolution optical education Fourier transform

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A lazy way to design infrared lens 18

A lazy way to design infrared lens

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Conference on current developments in lens design and optical engineering XvIII

作者： Qiu, RongSheng Wu, JianDong Chen, LongJiang Yu, Kun Pang, HaoJun Hu, BaiZhen Shanghai Aerosp Control Technol Inst 1555 ZhongChun Rd Shanghai 201109 Peoples R China

ISBN: (纸本)9781510612082;9781510612075

We designed a compact middle-wave infrared (MWIR) lens with a large focal length ratio ( about 1.5:1), used in the 3.7 to 4.8 mu m range. The lens is consisted of a compact front group and a re-imaging group. Thanks to the compact front group configuration, it is possible to install a filter wheel mechanism in such a tight space. The total track length of the lens is about 50mm, which includes a 2mm thick protective window and a cold shield of 12mm. The full field of view of the lens is about 3.6 degrees, and F number is less than 1.6, the image circle is about 4.6mm in diameter. The design performance of the lens reaches diffraction limitation, and doesn't change a lot during a temperature range of -40 degrees C+60 degrees C This essay proposed a stepwise design method of infrared optical system guided by the qualitative approach. The method fully utilize the powerful global optimization ability, with a little effort to write code snippet in optical design software, frees optical engineer from tedious calculation of the original structure.

关键词： infrared optical system lens design athermalization filter wheel multispectral sensing

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Achieving linearity with an optical quadrant detector tracking system 18

Achieving linearity with an optical quadrant detector tracki...

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Conference on current developments in lens design and optical engineering XvIII

作者： Doherty, victor J. Aouani, Dina Eidolon Opt LLC 3 Erie Dr Natick MA 01760 USA

ISBN: (纸本)9781510612082;9781510612075

Conventional round spot quadrant detector trackers are inherently non-linear. This non-linearity requires multiple iterations to converge onto perfect alignment with the object tracked. We created a system that generates a square spot. The convolution of a square spot with a circle, generated by the quadrant detector, allows this spot to achieve perfect alignment in one iteration. This invention is thus essential to any system that requires speed and accuracy. In this paper, we introduce the theory behind the square spot as well as the design of our linear optical quadrant detector tracking technology.

关键词： Quadrant Detector optical Tracking Sun Tracking Solar Surgery Square Spot

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Smart lighting using a liquid crystal modulator 18

Smart lighting using a liquid crystal modulator

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Conference on current developments in lens design and optical engineering XvIII

作者： Baril, Alexandre Thibault, Simon Galstian, Tigran Univ Laval Dept Phys Genie Phys & Opt Ctr Opt Photon & Laser 2375 Rue Terrasse Quebec City PQ G1V 0A6 Canada

ISBN: (纸本)9781510612082;9781510612075

Now that LEDs have massively invaded the illumination market, a clear trend has emerged for more efficient and targeted lighting. The project described here is at the leading edge of the trend and aims at developing an evaluation board to test smart lighting applications. This is made possible thanks to a new liquid crystal light modulator recently developed for broadening LED light beams. The modulator is controlled by electrical signals and is characterized by a linear working zone. This feature allows the implementation of a closed loop control with a sensor feedback. This project shows that the use of computer vision is a promising opportunity for cheap closed loop control. The developed evaluation board integrates the liquid crystal modulator, a webcam, a LED light source and all the required electronics to implement a closed loop control with a computer vision algorithm.

关键词： optical systems Illumination closed loop vision system spatial light modulator

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