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

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A 10-channel 300-Mb/s/ch replica TIA array with equalizer in 0.18-μm CMOS

A 10-channel 300-Mb/s/ch replica TIA array with equalizer in...

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International SoC design conference, ISOCC

作者： He Ying Chaerin Hong Kyungmin Lee Dayoung Kim Seung Hoon Kim Sung Min Park Department of Electronics Engineering Ewha Womans University Seoul Korea

This paper presents a 10-channel optical receiver array for Near-InfraRed Spectroscopy (NIRS) Systems. Each channel consists of a replica transimpedance amplifier (TIA) followed by an adjustable linear equalizer (EQ). The replica TIA achieves a high transimpedance gain of 94.6 dBΩ and a bandwidth of 85 MHz. To obtain wider bandwidth, a two-stage fully differential equalizer with tunable capacitor banks is exploited. Post-layout simulations reveal the total transimpedance gain of 100 dBΩ, the -3-dB bandwidth of 200 MHz, and the input noise current spectral density of 2 pA/√Hz for the DC current consumption of 9.4 mW per channel with a single 1.8-v supply. The proposed front-end of NIRS preamplifier is implemented using 0.18-μm CMOS technology.

关键词： Arrays Bandwidth optical receivers Gain CMOS integrated circuits Capacitors Equalizers

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Investigation of Electrical and optical Characteristics in Electrochemiluminescence Cell Used by AC Driven Different Waveforms

Investigation of Electrical and Optical Characteristics in E...

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2015 International conference on Power Electronics and Energy engineering（PEEE 2015）

作者： P.Chansri Y.M.Sung Electrical Engineering Kyungsung University

The AC driven potential waveforms in electrochemiluminescence cell are important a study behavior of electrical and optical characteristics. So, we seek to suggest fabrication for ECL cell, and are investigated these characteristics used by AC difference waveforms;square wave, sinusoidal wave and triangle wave for control reaction of light emission. From the results, square waveform was showed the luminance of 76.2cd/m2 and current of 25.1m A at 5v, 60 Hz, the threshold voltage at 2.15 v. When, the applied frequency was obtained initial light intensity at 5Hz. From the results should be possible to design and build AC-driven for ECL cell used by square wave.

关键词： Electrochemiluminescence Cell AC driven Ru(bpy)3(PF6)2

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optical design of Low Glare Luminaire Applied for Tunnel Light 15

Optical Design of Low Glare Luminaire Applied for Tunnel Lig...

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conference on current developments in Lens design and optical engineering Xv

作者： Tsai, M. S. Lee, X. H. Lo, Y. C. Sun, C. C. Natl Cent Univ Dept Opt & Photon Chungli 320 Taiwan

ISBN: (纸本)9781628412192

In this study, a low glare and high-efficient tunnel lighting design which consists of a cluster light-emitting diode and a free-form lens is presented. Most of the energy emitted from the proposed luminaire is transmitted onto the surface of the road in front of drivers, and the probability that the energy is emitted directly into drivers' eyes is low. Compared with traditional fluorescent lamps, the proposed luminaire, of which the optical utilization factor, optical efficiency, and uniformity are, respectively, 44%, 92.5%, and 0.72, performs favorably in traffic safety, energy saving, and glare reduction.

关键词： Light-emitting diodes Illumination design Nonimaging optics optical design and fabrication

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Study of Camera Calibration Process with Ray Tracing 15

Study of Camera Calibration Process with Ray Tracing

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conference on current developments in Lens design and optical engineering Xv

作者： Poulin-Girard, A. -S. Dallaire, X. veillette, A. Thibault, S. Laurendeau, D. Univ Laval Dept Phys Genie Phys & Opt Ctr Opt Photon & Laser Quebec City PQ G1V 0A6 Canada Univ Laval Dept gen elect & gen informat Lab vision & syst numer Quebec City G1V 0A6 PQ Canada

ISBN: (纸本)9781628412192

Camera calibration is essential for any optical system used to obtain 3D measurements from images. The precision of the 3D depth estimation relies on an appropriate camera model and the accurate estimation of model parameters. These parameters are sensitive to environmental conditions and it is well established that a vision system should be calibrated in operating conditions. This is not always possible since the calibration process is often tedious and time-consuming. Unfortunately, the use of poorly estimated calibration parameters for 3D reconstruction and measurements may lead to suboptimal performance of the system and inaccurate depth estimation. This paper presents a technique using an existing camera model and optical design software to perform calibration simulations. This virtual calibration technique allows for a study of the impact of environmental conditions on the calibration parameters. Using this procedure, it is also possible to predict the statistical behavior of the calibration parameters considering the chosen fabrication processes and tolerances. It can assist vision scientists in the choice of the optical system that best meets the requested precision of the 3D reconstruction. This technique could eventually be integrated in the lens design process to create more reliable optical systems that could be calibrated and used in a range of environmental conditions with a very small variation of their calibration parameters.

关键词： Camera calibration optical design software tolerancing lens design

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Nonimaging Achromatic Lens design for LED Direct-lit Backlight Applications 15

Nonimaging Achromatic Lens Design for LED Direct-lit Backlig...

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conference on current developments in Lens design and optical engineering Xv

作者： Tsai, Meng-Che Chen, Bo-Song Lee, Tsung-Xian Natl Taiwan Univ Sci & Technol Grad Inst Appl Sci & Technol 43Sec 4Keelung Rd Taipei 106 Taiwan Natl Taiwan Univ Sci & Technol Grad Inst Color & Illuminat Technol Taipei 106 Taiwan

ISBN: (纸本)9781628412192

Nowadays, light emitting diodes (LEDs) have been widely used in backlight module for display technology. Most of researches tend to improve optical performance in specific applications, such as sufficient efficiency, desired intensity distribution and high illuminance uniformity. However, most of phosphor converted white LEDs have the problem of inducing impure white light. The undesired phenomenon of yellow ring or blue ring becomes more serious through incorrect secondary optical design. In this paper, we emphasize on enhancing the spatial color and illuminance uniformity of LED direct-lit backlight using nonimaging achromatic lens design. We propose a new design method to re-distribute and uniform the ratio of blue and yellow light on the target surface. Moreover, we further apply it in direct-lit LED backlight lens design, in which the uniformity of illuminance on the out coupling surface can be as much as 83.7% and the color uniformity (Delta u'v') is improved to 0.0039. Therefore, the result of high color and illumination uniformity can be achieved simultaneously.

关键词： LED direct-lit backlight Achromatic lens design Illuminance uniformity Color uniformity

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Motion compensation in a tomographic ultrasound imaging system: toward volumetric scans of a limb for prosthetic socket design

Motion compensation in a tomographic ultrasound imaging syst...

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Annual International conference of the IEEE engineering in Medicine and Biology Society

作者： Bryan J. Ranger Micha Feigin Nikita Pestrov Xiang Zhang victor Lempitsky Hugh M. Herr Brian W. Anthony the Harvard-MIT Health Sciences and Technology Program Massachusetts Institute of Technology and Harvard Medical School Cambridge MA 02139 USA the Department of Media Arts and Sciences Massachusetts Institute of Technology Cambridge MA 02139 USA the Skolkovo Institute of Science and Techonology Skolkovo 143025 Russian Federation the Department of Mechanical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA the Department of Media Arts and Sciences and Harvard-MIT Health Sciences and Technology Program Massachusetts Institute of Technology and Harvard Medical School Cambridge MA 02139 USA

ISBN: (纸本)9781424492695

current methods of prosthetic socket fabrication remain subjective and ineffective at creating an interface to the human body that is both comfortable and functional. Though there has been recent success using methods like magnetic resonance imaging and biomechanical modeling, a low-cost, streamlined, and repeatable process has not been fully demonstrated. Medical ultrasonography, which has significant potential to expand its clinical applications, is being pursued to acquire data that may quantify and improve the design process and fabrication of prosthetic sockets. This paper presents a new multi-modal imaging approach for acquiring volumetric images of a human limb, specifically focusing on how motion of the limb is compensated for using optical imagery.

关键词： human body that limb is compensated using optical imagery

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Towards Collaborative Plant Control using a Distributed Information and Interaction Space

Towards Collaborative Plant Control using a Distributed Info...

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IEEE conference on Emerging Technologies and Factory Automation

作者： Johannes Pfeffer Markus Graube Patrick Reipschlaeger Stephan Arndt Leon Urbas Raimund Dachselt Ralph Stelzer Chair of Process Control Systems Engineering Technische Universitat Dresden Interactive Media Lab Dresden Technische Universitat Dresden Chair of Engineering Design and CAD Technische Universitat Dresden

ISBN: (纸本)9781467379304

As Smart Manufacturing, Industrial Internet, Industrie 4.0, and Cyber-Physical Production System (CPPS) are becoming reality, the way process and manufacturing plants are operated has to change. Additionally, these developments - constituting the pervasive digitalisation of industry - have a profound effect on the way human workers and machines interact. This paper contrasts the current state of the art in plant control with a vision for the future. The scenario is illustrated by a realistic problem-solving process in a chemical plant. It describes an integrated industrial information and interaction space that leverages emerging technologies to enable plant operators to remain in control of future flexible modularised process plants. Our approach shows the advantages of an integrated information space which feeds interaction and collaboration using virtual Reality (vR), novel display technologies and mobile devices.

关键词： Plant control interaction space information space Manufacturing plants chemical plant Leverage DISPLAYING Mobile devices state of the art current status machine Arts Sight

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Caustic surface of a plane wavefront refracted by a smooth arbitrary surface 15

Caustic surface of a plane wavefront refracted by a smooth a...

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conference on current developments in Lens design and optical engineering Xv

作者： Avendano-Aleja, Maximino Univ Nacl Autonoma Mexico Ctr Ciencias Aplicadas & Desarrollo Tecnol Mexico City 04510 DF Mexico

ISBN: (纸本)9781628412192

We study the formation of caustic produced by smooth arbitrary surfaces considering a plane wavefront propagating parallel to the optical axis and impinging on the refracting surface. We have already seen that the shape of the caustic surface can represent the monochromatic aberrations that we call image errors, furthermore the shape of the caustic can be modified by changing the parameters of the lens in such a way that if the caustic surfaces is vanished the optical system produces a perfect image, on the other hand for a caustic possessing a large area it could be applied to design no-imaging optical systems. The shape of the caustic depends only on the indices of refraction involved in the process of refraction, the refracting surface which is formed by smooth arbitrary plano-convex lens. We provide an analytic equation for the caustic surface after refraction of a plane wave from every rotationally symmetric surface.

关键词： Refraction Aspheric lenses Wavefronts Ray tracing optical design Geometrical optics Monochromatic aberrations Light Radon Wave propagation

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High quality Uv - NIR thin film interference polarizers 15

High quality UV - NIR thin film interference polarizers

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conference on current developments in Lens design and optical engineering Xv

作者： Novopashin, vladimir v. Shestakov, Alexsandr v. Polyus Res & Dev Moscow 117342 Russia

ISBN: (纸本)9781628412192

Interference polarizers can be successfully used in lasers and laser devices as independent optical element substituted crystal polarizers. Today, the use of crystal polarizers in some cases can lead to definite difficulties in accordance with peculiarities of laser cavity construction. The novel laser technologies and design of laser elements defined the new demands to optical coatings. In modern lasers interference polarizer can be considered as one of the main element that operates laser radiation. According to special optical outline and the requirements to optical characteristics of laser polarizers can be bryuster or mirror-type. The stable of spectral characteristic at a definite angle is one of the most important parameter. It was shown how optical thickness of each layer influence on angle stability. On the other hand high stable was achieved by using electron-beam ion assisted deposition. The coatings were deposited on the surface of optical glass BK-7 or quartz. Generally, refractory oxides were used. The achievement of the condensation layers structure was provided by active O-2(+) ions. It was shown, that smooth cleaning by neutral ions as before the evaporation definite separate layer, as after stabilized the optical properties of polarizer. Moreover, the using of ion source allowed increase laser damage threshold. It can be underline that some advantages of ion source revealed during evaporation materials in visible and especially ultra violet region. Also, laser strength was rather more at 1535 nm for ion-assisted deposited films. The average parameters were: minimum transmission efficiency T-P > 97%, extinction ratio T-P/T-S > 500, laser damage more than 10 J/cm(2), 10 nanosecond pulse at 1064 nm in laser spot 200 mu m.

关键词： interference polarizer electron-beam evaporation ion source laser strength ion-beam assisted deposition refractory oxides

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Using saddle points for challenging optical design tasks 15

Using saddle points for challenging optical design tasks

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conference on current developments in Lens design and optical engineering Xv

作者： Livshits, Irina Hou, Zhe van Grol, Pascal Shao, Yifeng van Turnhout, Maarten Urbach, Paul Bociort, Florian Natl Res Univ Informat Technol Mech & Opt 16 Birzhevaya Line St Petersburg 199034 Russia Delft Univ Technol Optic Res Grp NL-2628CJ Delft Netherlands TNO Sci & Ind NL-2628CK Delft Netherlands

ISBN: (纸本)9781628412192

The present research is part of an effort to develop tools that make the lens design process more systematic. In typical optical design tasks, the presence of many local minima in the optical merit function landscape makes design non-trivial. With the method of Saddle Point Construction (SPC) which was developed recently ([F. Bociort and M. van Turnhout, Opt. engineering 48, 063001 (2009)]) new local minima are obtained efficiently from known ones by adding and removing lenses in a systematic way. To illustrate how SPC and special properties of the lens design landscape can be used, we will present the step-by-step design of a wide-angle pinhole lens and the automatic design of a 9-lens system which, after further development with traditional techniques, is capable of good performance. We also give an example that shows how to visualize the saddle point that can be constructed at any surface of any design of an imaging system that is a local minimum.

关键词： saddle points wide-angle lens

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