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conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings vI

作者： Poulin-Girard, Anne-Sophie Parent, Jocelyn Thibault, Simon Desaulniers, Pierre Univ Laval Dept Phys Genie Phys & Opt Quebec City PQ G1V 0A6 Canada

ISBN: (纸本)9780819482822

Panoramic imaging is of growing importance in many applications around the world spurred by the development of digital imaging. Panoramic lens characteristics are unique and their careful characterization can be a challenge. For example, the price to pay for a large field of view in this type of lens is high distortion in the image. For vision applications like security or inspection, a precise knowledge of the distortion introduced by panoramic lenses is essential to produce natural unwrapped views to the operator. Of special concern is the image quality which must be uniformed over the entire field of view because all directions are equally important. In addition, two hemispheric images can also be stitched together to create a complete spherical image. For these reasons, we have developed a dedicated setup to study the distortion and the image quality produced by panoramic lenses. The test setup is made of a 75-cm radius cylindrical structure with targets placed on it. Using referenced equally-spaced targets, we obtained the radial image mapping curves for various azymuthal angles, allowing us to calculate the full-field resolution map. Also, transition targets were used to find field-dependent spatial frequency where the MTF is 50%. We tested four different panoramic lenses, two panomorph lenses and two fisheyes. For each lens, we discussed the experimental resolution and MTF curves and compared some of those results to theoretical design data.

关键词： Panoramic lenses distortion resolution MTF

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Barium Fluoride and glass combinations for short-wave infrared designs

Barium Fluoride and glass combinations for short-wave infrar...

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conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings vI

作者： Warren, D. W. Aerosp Corp Visible & Infrared Sensor Syst Dept Los Angeles CA 90009 USA

ISBN: (纸本)9780819482822

Achromatic doublet theory is recast for the 1-2.5 mu m short-wavelength infrared band, suggesting the desirability of combining barium fluoride with specific high index optical glasses having large differences in primary SWIR dispersion and small differences in partial SWIR dispersion. Candidate combinations of materials are screened empirically using the performance of optimized f/3 airspaced achromatic doublets employing barium fluoride as the positive element. Polychromatic RMS geometric image spot sizes appear to increase quadratically with difference in partial SWIR dispersion between barium fluoride and the complementary glasses. Examples of complex (fast, wide field) systems demonstrate the utility of the most promising combinations.

关键词： lens design infrared barium fluoride achromatic astronomy

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design and Fabrication of Super mirrors on the Zerodur substrate

Design and Fabrication of Super mirrors on the Zerodur subst...

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conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings vI

作者： Cho, Hyun-Ju Jeon, Young-Zip Daeduk Univ Dept Firearms & Opt 48 Jang Dong Taejon 305715 South Korea Daeduk Univ Dept Special Weapon Taejon 305715 South Korea

ISBN: (纸本)9780819482822

Super mirror is a high reflectance mirror with very low absorption and scattering losses. We carefully measured the surface roughness of Zerodur substrate using phase shift interferometer and atomic force microscope, and compared it with the scattering of the mirror. The absorption of the mirror was measured by cavity ring-down method, and its results were correlated to the thin film structure. To avoid the Uv degradation which comes from the He-Ne plasma, we carefully select the mirror fabrication material, and design the high reflectance mirror. Finally, mirror was fabricated by ion beam sputtering method and its optical properties were measured.

关键词： super mirror ion beam sputtering super-polishing Zerodur loss roughness scattering Uv degradation

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A novel approach for structural synthesis of zoom systems

A novel approach for structural synthesis of zoom systems

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conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings vI

作者： Hazra, L. N. Pal, S. Univ Calcutta Dept Appl Opt & Photon Kolkata India

ISBN: (纸本)9780819482822

A new approach for 'ab initio' synthesis of thin lens structure of zoom lenses is reported. This is accomplished by an implementation of evolutionary programming, based on Genetic Algorithm, which explores the available configuration space formed by powers of individual components and inter-component separations. Normalization of the variables is carried out to get an insight on the optimum structures. The method has been successfully used to get thin lens structures of mechanically compensated, optically compensated, and linearly compensated zoom lens systems by suitable formulation of merit function of optimization. Investigations have been carried out on three component and four component zoom lens structures. Illustrative numerical results are presented.

关键词： optically compensated zoom lenses mechanically compensated zoom lenses evolutionary programming genetic algorithm thin lens design

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Accelerating diffractive optics design with GPU-based parallel technique

Accelerating diffractive optics design with GPU-based parall...

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conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings vI

作者： Liu, Kan Li, Hui Zhang, Xinyu Li, Dehua Wei, Mingyue Li, Bin Xie, ChangSheng Zhang, Tianxu Huazhong Univ Sci & Technol Inst Pattern Recognit & Artificial Intelligence State Key Lab Multispectral Informat Proc Technol Wuhan 430074 Hubei Peoples R China Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China

ISBN: (纸本)9780819482822

In this paper GPU based data parallel technique is used to reduce calculating time in diffractive optics elements (DOE) design. By using compute unified device architecture (CUDA) framework, comparison of acceleration radio of some major methods using in DOE design, including Gerchberg Saxton algorithm for global optimization in conjunction with Rayleigh-Sommerfeld diffractive integrating transformation, genetic algorithm with a finite-difference time-domain method and simulated annealing algorithm, is made with demonstrational DOE-lens design, whose focal spot size is 0.5 mu m, incident light wavelength is 650 nm, focal length is 3mm, DOE aperture size is 2mm.

关键词： DOE design GPU acceleration CUDA Algorithm comparison

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The design and fabrication of telecentric lens with large field of view

The design and fabrication of telecentric lens with large fi...

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conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings vI

作者： Chang, Chun-Li Huang, Kuo-Cheng Wu, Wen-Hong Lin, Yi-Hung Natl Appl Res Labs Instrument Technol Res Ctr Hsinchu Taiwan Natl Pingtung Univ Sci & Technol Dept Engn Mech Pingtung Taiwan

In ultra-precision (distortion 100 mm). Based on the concept of equivalent design in optical tolerances, the lens module can be designed readily into a telecentric system, which consists of five spherical lenses and a... 详细信息

ISBN: (纸本)9780819482822

In ultra-precision (distortion <0.5%) vision inspection system, the accuracy of measurement depends on sharpness and distortion of image. The telecentric lens provides distortion-free and constant magnification (within depth of field) image, so it has become an indispensable key module in the amount of visual measuring system. The article presents a design and development of telecentric lens module for the wide range of vision inspection system (field-of-view >100 mm). Based on the concept of equivalent design in optical tolerances, the lens module can be designed readily into a telecentric system, which consists of five spherical lenses and a glass molded aspheric lens. In order to correct image distortion, an aspheric lens would be added to the telecentric system. The experiment shows that the distortion can be reduced from 1.5% to 0.34% and the depth of field (DOF) is also improved up to 28.3 mm.

关键词： telecentric lens machine-vision aspheric lens equivalent tolerance

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3D optical AND DEvICE SIMULATION OF SURFACE PLASMONIC EFFECTS ON ORGANIC SOLAR CELLS USING SILvER NANO PRISMS

3D OPTICAL AND DEVICE SIMULATION OF SURFACE PLASMONIC EFFECT...

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IEEE Photovoltaic Specialists conference

作者： Wenjun Jiang Scott. T. Dunham Physics Department University of Washington Department of Electrical Engineering University of Washington

ISBN: (纸本)9781424499663

We explore the enhancement of light absorption due to triangle-shaped silver nanoprisms in P3HT:PCBM active layer and its impact on organic solar cell performance by coupling optical and electronic device simulation. We use optical simulation via FDTD solution of Maxwell's equations in order to calculate the surface plasmonic resonance at the interface of P3HT:PCBM and silver nanoprisms. The presence of silver nanoprisms results in dramatic local enhancement of optical absorption. We explore different design of silver nanoprisms by changing sizes, densities, and relative orientations to see their impact on optical carrier generation. From the device modeling point of view, a thinner active layer enabled by enhanced absorption reduces the mismatch of light absorption depth with exciton dissociation length. We use the Sentaurus Device simulator (Synopsys), adapted with material-specific models for electronic polymers, to explore the impact of surface plasmon resonance on device behavior. The coupling of optical and electrical simulation gives a short-circuit current increase of 3 times for 35nm ultra-thin active layer with silver nanoprisms, consistent with experiment.

关键词： Silver optical surface waves Plasmons Photovoltaic cells optical reflection Absorption Surface morphology

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design of small confocal endo-microscopic probe working under Multi-wavelength environment

Design of small confocal endo-microscopic probe working unde...

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conference on Endoscopic Microscopy v

作者： Kim, Young-Duk Ahn, MyoungKi Gweon, Dae-Gab Korea Adv Inst Sci & Technol Dept Mech Engn Nanoopto Mech Lab Taejon 305701 South Korea

ISBN: (纸本)9780819479549

Recently, optical imaging system is widely used in medical purpose. By using optical imaging system specific diseases can be easily diagnosed at early stage because optical imaging system has high resolution performance and various imaging method. These methods are used to get high resolution image of human body and can be used to verify whether the cell is infected by virus. Confocal microscope is one of the famous imaging systems which is used for in-vivo imaging. Because most of diseases are accompanied with cellular level changes, doctors can diagnosis at early stage by observing the cellular image of human organ. current research is focused in the development of endo-microscope that has great advantage in accessibility to human body. In this research, I designed small probe that is connected to confocal microscope through optical fiber bundle and work as endo-microscope. And this small probe is mainly designed to correct chromatic aberration to use various laser sources for both fluorescence type and reflection type confocal images. By using two kinds of laser sources at the same time we demonstrated multi-modality confocal endo-microscope.

关键词： Confocal microscope Endo-microscope Probe Fluorescence Reflection Fiber bundle

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design optimisation of the ITER divertor magnetic probes using FEM analyses

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FUSION engineering AND design 2010年第1期85卷 18-23页

作者： Encheva, Anna vayakis, George Karpushov, Alexander Assoc Euratom Lausanne Ctr Rech Phys Plasmas Ecole Polytech Fed Lausanne Lausanne Switzerland Ctr Cadarache ITER Diagnost Grp F-13108 St Paul Les Durance France

This paper is focused on the design, simulation and optimisation of the ITER divertor magnetic tangential coils. The most critical issue for the divertor coils is to minimise RITES [G. vayakis, et al., Radiation-induced thermoelectric sensitivity (RITES) in ITER prototype magnetic sensors, Rev. Sci. Instrum. 75 (10) (2004) 4324-4327] and TIEMF [R. vila, E.R. Hodson, Thermally induced EMF in unirradiated MI cables, J. Nucl. Mater. 367-370 (Part 2) (2007) 1044-1047] by combining a proper choice of conductor with low temperature variation in the coil. Instead of mineral insulated cable (MIC), which was foreseen as the preferred winding, a winding made of ceramic-coated steel wire was recently proposed [G. Chitarin, L. Grando, S. Peruzzo, C. Tacconet, design developments for the ITER in-vessel equilibrium Halo current sensors, 24th SOFT conference, Warsaw, Poland, September 2006, Fusion Eng. design, in press]. It is thought that, for this wire, maintaining a temperature variation in the wiring below 10 K will be sufficient to allow long-pulse operation. variations of the divertor coil design have been simulated with the help of ANSYS. The aim was to keep the temperature variation in the winding pack within this limit. The optimisation of the coil based only on a cooling by conduction was not sufficient to meet the 10 K target. Therefore, an actively water-cooled coil was designed which finally met these requirements. (C) 2009 Published by Elsevier B.v.

关键词： ITER Divertor Magnetic Coils ANSYS CFX

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A comparative study on ASIC design of high frequency low power photoreceiver using 0.15μm CMOS technology

A comparative study on ASIC design of high frequency low pow...

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6th International conference on Electrical and Computer engineering, ICECE 2010

作者： Maitra, Mausumi Chakraborty, Kaushik Chowdhury, Shubhajit Roy Department of Information Technology Government College of Engineering and Ceramic Technology West Bengal University of Technology Kolkata-700010 India IC Design and Fabrication Centre Department of Electronics and Telecommunication Engineering Jadavpur University Kolkata-700032 India

ISBN: (纸本)9781424462797

The current work focuses on the design of a fully integrated single beam photoreceiver that can accept optical pulses of 850nm wavelength at a bandwidth as high as 1Gbps. This is highly suitable for implementation in fiber optic LANs and short haul optical interconnects. The recent advances of fiber optic communication technology with vLSI circuit design methodologies has motivated the development of low power complementary metal oxide semiconductor (CMOS) photoreceiver capable of detecting optical pulses at 1Gbps. The receiver integrates a photo-detector and a preamplifier circuit. The idea of using the CMOS technology is to achieve a high frequency low power implementation of the system. The average power dissipation of the receiver has been found earlier to be less than 0.105mW at a supply voltage of 1v for 0.3 μm CMOS technology. The current work has been done using the 0.15μm CMOS technology with power dissipation as low as . Also, a comparative study of frequency response of the receiver circuit has been made for different values of junction resistance and capacitance of the p-i-n photodiode. The whole work has been done using TSPICE simulation tool. ©2010 IEEE.

关键词： Frequency response

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