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

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Three dimensional point spread function of a high aperture optical system

Three dimensional point spread function of a high aperture o...

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conference on current developments in lens design and optical engineering XIV

作者： Borovytsky, Volodymyr Chorna, Viktoriia Solovei, Alex Nat Techn Univ Ukraine KPI Dept Opt Engn UA-03056 Kiev Ukraine

ISBN: (纸本)9780819496911

The paper presents the mathematical technique for precise calculation of the three dimensional point spread function (3D PSF) of a high aperture optical system. The proposed technique is based on Huygens-Fresnel principle: a spherical wave at an exit pupil is considered as a numerous set of elementary secondary light sources. They emit spherical coherent electro-magnetic waves. All these waves form a definite distribution of summarized complex amplitudes in a three dimensional space near a focal point. This distribution is used for calculation of the distribution of effective intensity which takes into account the influence of inclined optical beams. The comparison analysis of this approach and the techniques based on multi-dimensional Fourier transforms are discussed.

关键词： point spread function optical system pupil function Fourier transform intensity distribution optical microscopy spatial resolution

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design of compact fisheye lens with slope-constrained Q-type aspheres

Design of compact fisheye lens with slope-constrained Q-type...

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conference on current developments in lens design and optical engineering XIV

作者： Xu, Chen Cheng, Dewen Song, Weitao Wang, Yongtian Wang, Qingfeng Beijing Inst Technol Sch Optoelect Beijing 100081 Peoples R China

ISBN: (纸本)9780819496911

Two types of fisheye lenses for automobile navigation are designed with slope-constrained Q-type aspheres. Special requirements have been considered in the design process, and Q-type surfaces are introduced by converted from other kinds of aspheric description with only coefficients of low-order terms retained. A possible problem of imaging the first surface onto the sensor has also been analyzed. As a result, as for the six-element fisheye lens, MTF is greater than 0.3 at 45lp/mm, f-theta distortion is less than 0.03 when the focal length is calibrated, field of view is 230 degrees and full field relative illumination is greater than 0.4. For the four-element fisheye lens, MTF is greater than 0.4 at 45lp/mm, f-theta distortion is less than 0.16, field of view is 190 degrees and full field relative illumination is greater than 0.6. The design results show that the Q-type surfaces employed in fisheye lenses can make the system more compact, lightweighted and easier to manufacture.

关键词： fisheye lens Q-type asphere distortion evaluation tolerance analysis image quality analysis

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Application of the light field for a simulation to evaluate the MTF of optical lens systems using rendering

Application of the light field for a simulation to evaluate ...

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conference on current developments in lens design and optical engineering XIV

作者： Horiuchi, Shuma Yamamoto, Manabu Tokyo Univ Sci Dept Appl Elect Katsushika Ku Tokyo 1258585 Japan

ISBN: (纸本)9780819496911

The modulation transfer function (MTF) in lens systems can be simulated using rendering. Here, the MTF is obtained by rendering test charts with bar target patterns after they are passed through an optical imaging system. The benefit of this method is that it can be applied to shift-variant systems, to which it is difficult to apply the point spread function (PSF), and that it enables the comparison of theoretical results to experimental results when test charts are imaged through an optical imaging system. However, the number of sampled rays must be increased to suppress the variance in the resulting radiance distribution, and the computation time increases proportionally with the number of analyzed spatial frequencies. This report proposes the recording of the light field of light rays, which is a function describing light rays at the entrance pupil. Focused images are compiled for each test chart based on the recorded light field. The time necessary for compilation is significantly shorter than for ray tracing in a lens;therefore, the radiance distribution can be rapidly obtained when the spatial frequency is changed. The methodology to record the light field and the data format are outlined in this report.

关键词： rendering light field modulation transfer function imaging optics

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Micro-optical elements for optical wireless applications

Micro-optical elements for optical wireless applications

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conference on current developments in lens design and optical engineering XIV

作者： Jin, Xian Guerrero, Daniel Klukas, Richard Holzman, Jonathan F. Univ British Columbia Sch Engn Integrated Opt Lab Kelowna BC V1V 1V7 Canada Univ British Columbia Sch Engn Posit & Navigat Signal Proc Lab Kelowna BC V1V 1V7 Canada

ISBN: (纸本)9780819496911

Customized high-contact-angle microlenses are presented for optical wireless communication (OWC) and optical wireless location (OWL) applications. These microlenses are fabricated by way of an electro-dispensing technique to establish wide field-of-views (FOVs). Each microlens is formed from dispensed UV-curable polymer with pressure-control defining the microlens volume and a voltage on the metal needle tip defining the microlens shape (by way of electrowetting). UV curing is then applied. Microlenses with FOVs up to 90 degrees are fabricated for high-density integration above a CMOS imaging sensor for wide-FOV operation in emerging OWC and OWL applications. Both theoretical ray-tracing analyses and experimental imaging results are presented with good agreement.

关键词： electro-dispensing field-of-view imaging sensor microlens optical wireless numerical aperture

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A three-channel miniaturized optical system for multi-resolution imaging

A three-channel miniaturized optical system for multi-resolu...

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conference on current developments in lens design and optical engineering XIV

作者： Belay, Gebirie Y. Ottevaere, Heidi Meuret, Youri Thienpont, Hugo Vrije Univ Brussel Fac Engn Dept Appl Phys & Photon TONA Brussels Photon TeamB PHOT B-1050 Brussels Belgium

ISBN: (纸本)9780819496911

Inspired by the natural compound eyes of insects, multichannel imaging systems embrace many channels that scramble their entire Field-Of-View (FOV). Our aim in this work was to attain multi-resolution capability into a multi-channel imaging system by manipulating the available channels to possess different imaging properties (focal length, angular resolution). We have designed a three-channel imaging system where the first and third channels have highest and lowest angular resolution of 0.0096 degrees and 0.078 degrees and narrowest and widest FOVs of 7 degrees and 80 degrees, respectively. The design of the channels has been done for a single wavelength of 587.6 nm using CODE V. The three channels each consist of 4 aspherical lens surfaces and an absorbing baffle that avoids crosstalk among the neighbouring channels. The aspherical lens surfaces have been fabricated in PMMA by ultra-precision diamond tooling and the baffles by metal additive manufacturing. The profiles of the fabricated lens surfaces have been measured with an accurate multi-sensor coordinate measuring machine and compared with the corresponding profiles of the designed lens surfaces. The fabricated lens profiles are then incorporated into CODE V to realistically model the three channels and also compare their performances with those of the nominal design. We can conclude that the performances of the two latter models are in a good agreement.

关键词： Multi-resolution imaging systems angular resolution multi-channel three-channel

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A framework of cloud supported collaborative design in glass lens moulds based on aspheric measurement

A framework of cloud supported collaborative design in glass...

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conference on current developments in lens design and optical engineering XIV

作者： Zhu, Yongjian Wang, Yu Na, Jingxin Zhi, Yanan Fan, Yufeng Jilin Univ State Key Lab Automot Simulat & Control Changchun 130025 Peoples R China Zhejiang Univ Sci & Technol Hangzhou 310023 Zhejiang Peoples R China Chinese Acad Sci Shanghai Inst Opt & Fine Mech Shanghai 201800 Peoples R China

ISBN: (纸本)9780819496911

Aspheric mould design includes the top-down design and reversal design. In this paper, a new framework of reversal design is proposed combining with cloud supported collaborative design (CSCD) based on aspheric measurement. The framework is a kind of collaborative platform, which is composed of eight modules, including the computerized aspheric precision measurement module (CAPM), computer-aided optical design of aspheric lens system (CAOD), computer-aided design of lens mould (CADLM), FEM(finite element method) simulation of lens molding module (FEMLM), computer-aided manufacture of lens & moulds (CAMLM), measurement data analysis module (MDAM), optical product lifecycle management module (OPLM) and cloud computing network module (CCNM). In this framework, the remote clients send an improved requirement or fabrication demand about optical lens system through CCNM, which transfers this signal to OPLM. In OPLM, one main server is in charge of the task distribution and collaborative work of other six modules. The first measurement data of aspheric lens are produced by clients or our proposed platform CAPM, then are sent to CAOD for optimization and the electronic drawings of lens moulds are generated in CADLM module. According the design drawings, the FEMLM could give the lens-molding simulation parameters through FEM software. The simulation data are used for the second design of moulds in CADLM module. In this case, the moulds could be fabricated in CAMLM by ultra-precision machine, and the aspheric lens could be also produced by lens-molding machine in CAMLM. At last, the final shape of aspheric lens could be measured in CAPM and the data analysis could be conducted in MDAM module. Through the proposed framework, all the work described above could be performed coordinately. And the optimum design data of lens mould could be realized and saved, then shared by all the work team.

关键词： aspheric measurement lens molding cloud supported collaborative design

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design, fabrication, and metrology of polymer gradient-index lenses for high-performance eyepieces

Design, fabrication, and metrology of polymer gradient-index...

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conference on current developments in lens design and optical engineering XIV

作者： Corsetti, James A. Visconti, Anthony J. Fang, Kejia McCarthy, Peter Schmidt, Greg R. Moore, Duncan T. Univ Rochester Inst Opt Rochester NY 14627 USA

ISBN: (纸本)9780819496911

High-performance eyepiece designs have been carried out using both spherical and radial gradient-index (GRIN) elements. Eyepiece designs of both geometries are shown to offer superior imaging performance with fewer elements when compared to purely homogeneous systems. These GRIN lenses are formed from monomer diffusion between polymethyl methacrylate (PMMA) and polystyrene (PSTY) during the polymerization process, resulting in a copolymer of the two homogeneous materials. A process for fabricating spherical GRIN elements is discussed where copolymer axial GRIN blanks are thermally compressed using spherical surface molds. This process curves the nominally-straight isoindicial surfaces of the axial GRIN rod to be consistent with the shape found during optimization of the design. Once compressed, the spherical blanks are diamond-turned for final surface figure and finish. Measurement of the GRIN profile is carried out using the Schmidt immersion technique in a Mach-Zehnder interferometer. Tolerances specific to GRIN elements are identified and determined to be readily achievable using the aforementioned manufacturing process.

关键词： Gradient-index spherical gradient-index polymer optics optical design eyepiece methyl methacrylate styrene

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The multichannel spectral device with transmitting analyzed optical signals by the optical fiber for the liquid propellant rocket engine diagnostics

The multichannel spectral device with transmitting analyzed ...

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conference on current developments in lens design and optical engineering XIV

作者： Vaganov, Mikhail A. Moskaletz, Oleg D. St Petersburg State Univ Aerosp Instrumentat Dept Elect & Opt Commun St Petersburg 190000 Russia

ISBN: (纸本)9780819496911

Recently spectroscopic methods of diagnostics of the liquid propellant rocket engines for prevention of emergencies become topical. Such diagnostics is based on tracking appearance of spectral lines of engine's constructional materials in spectrum of rocket plume radiation and glow dynamics of these lines. The multichannel optical spectral device considered in this paper makes the contactless spectrum analysis of optical radiations that allows to use this spectral device for diagnostics of the liquid propellant rocket engines. The novelty of this spectral device lies in application of the fiber-optical bundle and N parallel channels of the spectrum analysis [1]. Each channel contains the narrow-band optical filtration which has been set on the certain wave length. The fiber-optical bundle is used for transmitting analyzed optical radiation on a safe distance for the device from the rocket engine. This method of the contactless rocket engine diagnostics allows to except a direct contact of the spectral device with the field of rocket blast radiation and to eliminate negative influence of the engine on the spectral device, for example the acoustic impact.

关键词： Diagnostics of the rocket engines spectroscopic methods liquid propellant rocket engine spectrum of rocket plume radiation multichannel spectral device contactless spectrum analysis fiber-optical bundle narrow-band optical filter

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current developments in lens design and optical engineering XIV

Current Developments in Lens Design and Optical Engineering ...

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conference on current developments in lens design and optical engineering

ISBN: (纸本)9780819496911

The proceedings contain 37 papers. The topics discussed include: radiance limits of ceramic phosphors under high excitation fluxes;application of heterogeneous microlenses for solid state lighting;design of compact fisheye lens with slope-constrained Q-type aspheres;analytic formulas of the aspheric terms for convex-plano and plano-convex aspheric lenses;multi-core and GPU accelerated simulation of a radial star target imaged with equivalent T-number circular and Gaussian pupils;man versus machine: a lens design challenge;a 3D photographic capsule endoscope system with full field of view;double micro-prism array design for reducing dispersion on prism-based stereo camera system;optical architecture of the new generation infrared atmospheric sounder interferometer (IASI-NG);a three-channel miniaturized optical system for multi-resolution imaging;backward reflection analysis of transmitting channel of active laser ranging;and further results in measuring water ice buildup on optical components in cryogenic vacuum chambers.

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Ionic polymer metal composite to achieve optical zoom function in a compact camera

Ionic polymer metal composite to achieve optical zoom functi...

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conference on current developments in lens design and optical engineering XIV

作者： Chen, Wei-Hsiang Su, Guo-Dung Natl Taiwan Univ Grad Inst Photon & Optoelect Taipei 106 Taiwan

ISBN: (纸本)9780819496911

Nowadays, there are many popular electronic devices consist of optical focus zooming systems. It is the trend to minimize optical systems in portable devices. For this purpose, we used deformable mirrors in optical systems that can make them thinner and lighter. The Ionic-Polymer Metal Composite (IPMC) is the critical component in our design of the deformable mirror. It has good bending feature and can be driven at low voltage (less than 5 volts). The IPMC fabrication processes contain three steps: acid clean, initial compositing process and surface electrode plating process. After the IPMC is completed, we coated the PDMS on the surface to improve the surface roughness. Then we deposit silver on one side as a reflective surface to finish our deformable mirror. Some characteristics of the IPMC deformable mirror would be demonstrated in the paper. By coating the PDMS on the IPMC surface, the surface roughness can be reduced to about 20 nm. The reflection of the silver layer is up to 90%. In our design, we make the reflective optical zoom module which consists of three biconic mirrors and two deformable mirrors. When we applied voltages on deformable mirrors, the reflective light is successfully focused after the deformation of elliptic IPMC. The zoom ratio of this module can be expected to 1.8 times. The deformable mirror can be changed from flat to 65 diopters (m(-1)) by about 3 volts.

关键词： ionic polymer metal composite (IPMC) polydimethyl siloxane (PDMS) deformable mirror

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