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

共 443 条记录，以下是71-80 订阅

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Advanced optical design for DNA sequencing systems

Advanced optical design for DNA sequencing systems

引用

conference on current developments in lens design and optical engineering XII/Advances in Thin Film Coatings VII

作者： Sobolev, Kirill Joobeur, Adel Uhrich, Craig Aziz, David ASML (United States) Complete Genomics Inc. (United States) Midbar West Inc. (United States)

ISBN: (纸本)9780819487384

Recent advances in DNA sequencing techniques require the development of high NA immersion microscope systems with large field-of-view, increased resolution and very tight distortion correction. This paper discusses the optical design and tolerance analysis of a NA 1.0 immersion microscope system with a field of view over 1 mm, which is to be used for four-color fluorescence spectroscopy. The microscope system includes an immersion objective lens and four tube lenses, and is corrected for a wide wavelength range from 490 nm to 712 nm. We will discuss critical aspects of designing this kind of optical system, including special glass selection required for chromatic correction.

关键词： DNA sequencing high-end microscope system lens design optical engineering

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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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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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Near-infrared imaging system for detecting small organic foreign substances in foods

Near-infrared imaging system for detecting small organic for...

引用

conference on current developments in lens design and optical engineering xiv

作者： Tashima, Hiroto Genta, Tsuneaki Ishii, Yuya Ishiyama, Takeshi Arai, Shinichi Fukuda, Mitsuo Toyohashi Univ Technol Dept Elect & Elect Engn Toyohashi Aichi 4418580 Japan

ISBN: (纸本)9780819496911

Contamination of foodstuffs with foreign substances is a serious problem because it often has negative effects on consumer health. However, detection of small organic substances in foods can be difficult because they are undetectable with traditional inspection apparatus. In this work, we developed new equipment that can detect small organic contaminant substances in food at high speed using a near-infrared (NIR) imaging technique. The absorption spectra of various foods were measured, and the spectra showed low absorbance at wavelengths from 600 nm to 1150 nm. Based on the observable wavelength range of a CMOS camera, which has a high dynamic range, superluminescent diodes (SLDs) with a wavelength of 830 nm were selected as light sources. We arranged 40 SLDs on a flat panel and placed a diffusion panel over them. As a result, uniformly distributed light with an intensity of 0.26 mW/cm(2) illuminated an area of 6.0 cm x 6.0 cm. Insects (3 mm wide) and hairs (0.1 mm in diameter) were embedded in stacked ham slices and in chocolate, with a total thickness of 5 mm in each case, and the transmission images were observed. Both insects and hairs were clearly observed as dark shadows with high contrast. We also compensated the images by using software developed in this study to eliminate low spatial frequency components in the images and improve the sharpness and contrast. As a result, the foreign substances were more clearly distinguished in the 5-mm-thick ham.

关键词： NIR imaging optical equipment food detection foreign substance safety spatial frequency filter

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Recent progress on raytracing through metasurfaces 25

Recent progress on raytracing through metasurfaces

引用

conference on current developments in lens design and optical engineering XXV

作者： Borne, Jeck Bouillon, Christopher Cleroux-Cuillerier, Alexandre Thibault, Simon Univ Laval COPL 2375 Rue Terrasse Quebec City PQ Canada UQAR Inst Sci Mer 310 Allee Ursulines Rimouski PQ Canada

ISBN: (纸本)9781510679221;9781510679238

Our study presents recent progress in modelling and performing lens optical design with metasurfaces. We developed semi-analytical models that recover the output phase, polarization, dispersion and group delay of various nanostructures. This enables the mixing of different nanostructures to obtain a target dispersion profile an interesting application of the model. These models can readily be implemented within optical design software such as Zemax and use the built-in optimization of optical design processes while avoiding time-consuming electrodynamics computation. We also introduce the metasurfaces to the analytical lens design framework. This enables us to analytically compute the phase profile of freeform metasurface doublet concerning particular ray conditions such as the Abbe Sine condition as we presented here.

关键词： Metasurface Metasurface modelling optical design Analytical design

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Further results in measuring water ice buildup on optical components in cryogenic vacuum chambers

Further results in measuring water ice buildup on optical co...

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conference on current developments in lens design and optical engineering xiv

作者： Moeller, Trevor M. Smith, L. Montgomery Collins, Frank G. Labello, Jesse M. Rogers, James P. Lowry, Heard S. Crider, Dustin H. Univ Tennessee Inst Space 411 BH Goethert Pkwy Tullahoma TN 37388 USA Arnold Engn Dev Complex Arnold AFB TN 37389 USA

ISBN: (纸本)9780819496911

Experiments presented in a previous paper(1) established proof-of-principle that water, the most prevalent contaminant in high-vacuum cryogenic systems, initially collects on the surfaces of optical components as a thin film of ice, and thus can be detected and its thickness measured via multiple-beam thin-film interference phenomena. In those earlier experiments, a molecular sieve zeolite in a canister external to a vacuum chamber served as a water source, while the buildup of ice was measured using a HeNe laser beam reflected off the surface of a mirror with a quartz crystal microbalance (QCM) used for verification of the mass accumulation. Additional experiments have improved upon the techniques used earlier and provided further insight into the ice accumulation process. Use of a shorter wavelength (450 nm) laser in conjunction with a first-surface gold mirror produced greater depth of modulation and thus increased signal-to-noise ratio in the light interference. Data reduction using cross-correlation analysis over single-period interference records provided more accuracy and precision in the ice thickness measurements. Ice buildup under varying pressure and temperature ranges established baseline conditions for transparent thin-film deposition, and the transition to ice fracture and specular reflection. These recent experiments have demonstrated that the optical monitoring of ice accumulation via multiple-beam interference is applicable over a wider range of mass and thicknesses than the conventionally-used QCM method.

关键词： Cryogenic contamination thin film interference

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Realizing low-distortion in miniature wide-angle lens with freeform optics technique 23

Realizing low-distortion in miniature wide-angle lens with f...

引用

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

作者： Zhuang, Zhenfeng Parent, Jocelyn Roulet, Patrice Thibault, Simon Immervision Inc 2020 Robert Bourassa BlvdSuite 2320 Montreal PQ H2A 2A5 Canada Univ Laval Dept Phys Genie Phys & Opt 2375 Rue Terrasse Laval PQ G1V 0A6 Canada

ISBN: (纸本)9781510654198;9781510654181

Distortion is one major shortcoming of conventional wide-angle lens. The correction of distortion can maximize field of view in a wide-angle lens and benefit natural scenes. In this paper, we propose a compact wide-angle lens utilizing freeform surfaces to address the shortcoming. The design approaches, including the starting point selection, freeform surface conversion scheme, and system optimization, are discussed in detail. Moreover, freeform diagnostic tools are developed aiming to facilitate system optimization and visualize the critical aspects of optical performance. The simulation results are demonstrated and discussed. Analysis results demonstrate that the design strategies proposed in this paper have been shown to be effective in reducing distortion as well as improving optical performance. We envision that the proposed design schemes will have a positive effect on research and application values for wide angle lens system.

关键词： lens system design optical systems geometric optical design aspherics

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design study of a 2.2x zoom lens using plastic materials

Design study of a 2.2x zoom lens using plastic materials

引用

conference on current developments in lens design and optical Systems engineering

作者： Shi, WM Newell, MP Fischer, RE OPT 1 Inc Westlake Village CA 91362 USA

No abstract available.

ISBN: (纸本)0819437387

No abstract available.

关键词： Zoom lenses Distortion Glasses Aspheric lenses lens design Vignetting Chemical elements Cameras Plastic lenses Chromatic aberrations

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A compact and cost effective design for cell phone zoom lens

A compact and cost effective design for cell phone zoom lens

引用

conference on current developments in lens design and optical engineering VIII

作者： Chang, Chir-Weei Wu, Ching-Chin Ind Technol Res Inst Elect & Optoelect Res Labs 195Sec 4Chung Hsing Rd Hsinchu 310 Taiwan EFUN Technol Co Ltd Tainan 70955 Taiwan

ISBN: (纸本)9780819468154

A compact zoom lens design for cell phone is presented. A three groups lens system with five lens element is designed for cell phone camera with 3M pixels and 2.5 similar to 3X optical zoom. The first lens is a negative lens with a concave surface facing the object so that, when used for a long focal length, the rear principle plane is moved forwards to shorten the total length of the lens. A positive lens group composed of three lens elements is arranged at the second lens group. By control the optical power of the second lens group, the distortion can be reduced and also shortens the moving distance of the second lens group while zooming. The fifth lens in the third lens group is a positive lens to control the incident angle entering the photosensitive element. It is used for focusing when the object distance has changed.

关键词： zoom lens cell phone total track length

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design of lens hoods for the "Lira-B" space telescope 19

Design of lens hoods for the "Lira-B" space telescope

引用

19th conference on current developments in lens design and optical engineering

作者： Muratov, Artem Olyunin, Vyacheslav Bacholdin, Alexey Voznesenskaya, Anna ITMO Univ 49 Kronverksky Av St Petersburg 197101 Russia

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

The space investigation project "Lira-B" is purposed to perform a high-precision multicolor photometric all-sky survey of objects from 3 to 16 m. This investigation concludes in multiple photometric measurements in ten spectral bands from 200 to 1000 nm. Such telescope systems should provide maximum light gathering and meet stray light requirements. The main goal of the given work is optical design of the telescope system with lens hoods protecting against the parasitic illumination. Analysis of impact of the lens hoods' surface structure and coatings on the image quality is performed and ways to reduce the stray light in the system. The modeling is carried out using Zemax OpticStudio software in the non-sequential mode.

关键词： Lira-B Zemax lens hood telescopic system

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