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

共 530 条记录，以下是141-150 订阅

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Reduce Volume of Head-Up Display by Image Stitching 17

Reduce Volume of Head-Up Display by Image Stitching

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conference on current developments in lens design and optical engineering XVII

作者： Chiu, Yi-Feng Su, Guo-Dung J. Natl Taiwan Univ Grad Inst Photon & Optoelect 1Roosevelt RdSect 4 Taipei Taiwan

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

Head-up Display (HUD) is a safety feature for automobile drivers. Although there have been some HUD systems in commercial product already, their images are too small to show assistance information. Another problem, the volume of HUD is too large. We proposed a HUD including micro-projectors, rear-projection screen, microlens array (MLA) and the light source is 28 mm x 14 mm realized a 200 mm x 100 mm image in 3 meters from drivers. We want to use the MLA to reduce the volume by virtual image stitching. We design the HUD's package dimensions is 12 cm x 12 cm x 9 cm. It is able to show speed, map-navigation and night vision information. We used Liquid Crystal Display (LCD) as our image source due to its brighter image output required and the minimum volume occupancy. The MLA is a multi aperture system. The proposed MLA consists of many optical channels each transmitting a segment of the whole field of view. The design of the system provides the stitching of the partial images, so that we can see the whole virtual image. (C) 2016 optical Society of America

关键词： Heads up displays Microlens array Light sources Distortion Eye models LCDs Microlens Night vision optical design Spherical lenses

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design of a radiance meter with predicted size of source and distance effects 17

Design of a radiance meter with predicted size of source and...

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conference on current developments in lens design and optical engineering XVII

作者： Suarez-Romero, J. G. Solorio-Leyva, J. C. Hurtado-Ramos, J. B. Tecnolo Nacl Mexico lnst Tecnolo Queretaro Tecnolo SN Esq Escobedo Queretaro 76000 Qro Mexico Tecnol Nacl Mexico Inst Tecnol Piedad Tecnol 2000 La Piedad 59370 Michoacan Mexico Inst Politecnico Nacl Centro Invest Ciencia Aplicada Tecnol Cerro Blanco 141 Queretaro 76090 Qro Mexico

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

In a previous work, we described the theoretical fundamentals for the design of radiance meters. There, we observed that the length between the first and the second aperture of the instrument plays an important role in the performance of the meter. Such a length is a parameter related with the instrument response to variations of the size of the source and of the distance between the instrument and the source. Such dependences are not predicted by the theory of geometrical optics, normally used in the instrument design. Even the approximation of wave optics gives a partial understanding of the propagation of optical radiation. A more general treatment, based in the theory of partial coherence, gives a better description of the propagation.

关键词： Radiometry Radiance meter Partial Coherence Diffraction Lambertian Source Distance Effect Size of Source Effect Diffraction Corrections

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Proceedings of SPIE - The International Society for optical engineering

Proceedings of SPIE - The International Society for Optical ...

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current developments in lens design and optical engineering XVII

ISBN: (纸本)9781510602861

The proceedings contain 35 papers. The topics discussed include: some methods for determining the limit of potential image quality of optical systems of various complexities using the database;optical design of an ultrashort throw ratio projector with two freeform mirrors;reduce volume of head-up display by image stitching;optical performance of a PDMS tunable lens with automatically controlled applied stress;fabrication of focus-tunable liquid crystal microlens array with spherical electrode;characterization of a tunable liquid-filled lens with minimum spherical aberration;design of a radiance meter with predicted size of source and distance effects;formation of the color image based on the vidicon TV camera;AND efficient 3M PBS enhancing miniature projection optics.

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Low power and high speed CMOS current comparators

Low power and high speed CMOS current comparators

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2016 International conference on Advances in Electrical, Electronic and systems engineering, ICAEES 2016

作者： Restu, Wan Irma Idayu Nasir, Binti Wan Mohd Reaz, Md. Mamun Bin Ibne Dept. of Electrical Electronics and System Engineering Universiti Kebangsaan Malaysia Bangi Selangor Malaysia

ISBN: (纸本)9781509028894

Over the past few decades, a current comparator in CMOS technology has been used in the wide range of application in analogue, multiple-valued logic (MVL) circuits and other electronic products. current comparator usually used in analog to digital (ADC) conversion and any sensing detector or devices. The design of comparator has been successfully performed by applying several techniques and approach to improve the performance. This paper presents an overview of evolutionary CMOS current comparator, describing the contributions in low power and high speed according a collection of existing proposal. Various schemes and information have been taken to help researcher who will continue work on significant further developments. Lastly, some consideration of recent architectures such as power consumption and speed in current comparator are presented. © 2016 IEEE.

关键词： Comparators (optical)

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Path Loss Analysis in Millimeter Wave Cellular systems for Urban Mobile Communications 6

Path Loss Analysis in Millimeter Wave Cellular Systems for U...

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conference on Remote Sensing System engineering VI as a part of the SPIE Optics+Photonics Symposium on Remote Sensing Track of optical engineering+Applications

作者： Rajagopalan, Ramesh Hoffman, Mitchell Univ St Thomas Sch Engn 2115 Summit Ave St Paul MN 55105 USA

ISBN: (数字)9781510603462

ISBN: (纸本)9781510603455;9781510603462

The proliferation in the number of mobile devices and developments in cellular technology has led to an ever increasing demand for mobile data. The global bandwidth shortage facing wireless carriers today has motivated research for fifth generation (5G) cellular systems. In recent years, millimeter wave (mmW) frequencies between 30 and 300 GHz are being considered as a promising technology for 5G systems. Such systems can offer superior user experience by providing data rates that exceed one Gigabit per second and latencies lower than a millisecond. However, there is little research about cellular mmW propagation in densely populated urban environments. Understanding the radio channel is a primary requirement for optimal design of mmW systems. Radio propagation in mmW systems faces significant challenges due to rapidly varying channel conditions and intermittent connectivity. In this paper, we study the propagation of mmW spectrum in an urban environment. We use a statistical model to simulate an urban environment with diverse building distributions. We perform extensive simulations to analyze the path loss behavior for both line of sight (LOS) and non line of sight (NLOS) conditions for 28 GHZ and 73 GHZ mmW frequencies. We observe that the path loss approximates a logarithmic fit for both LOS and NLOS environments. Our simulations show that the omnidirectional free space path loss is approximately 30 dB higher for mmW systems compared to current 3G PP cellular systems. To address this challenge, we propose using highly directional horn antennas with beam forming for reducing the path loss.

关键词： 5G systems path loss beamforming

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design, developments, and results from the NIST additive manufacturing metrology testbed (AMMT) 27

Design, developments, and results from the NIST additive man...

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27th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2016

作者： Lane, B. Mekhontsev, S. Grantham, S. Vlasea, M.L. Whiting, J. Yeung, H. Fox, J. Zarobila, C. Neira, J. McGlauflin, M. Hanssen, L. Moylan, S. Donmez, A. Rice, J. Engineering Laboratory National Institute of Standards and Technology GaithersburgMD20899 United States Physical Measurement Laboratory National Institute of Standards and Technology GaithersburgMD20899 United States Mechanical and Mechatronics Engineering University of Waterloo WaterlooONN2L 3GI Canada

The National Institute of Standards and Technology (NIST) is developing a facility titled the Additive Manufacturing Metrology Testbed that will enable advanced research into monitoring, controls, process development, and temperature measurement for laser powder bed fusion additive manufacturing and similar processes. This system provides an open control architecture as well as a plethora of sensor systems and calibration sources that are primarily radiance-based and aligned co-axially with the laser beam and focused on the laser interaction zone. This paper briefly reviews the system requirements, and details the current progress of the facility design and construction. Mechanical, optical, and control systems designs are detailed with select highlights that may be relevant to additive manufacturing researchers and system developers. Recent experimental results from the prototype laser control and in-situ monitoring system are also highlighted. © 2016 The Department of Energy’s Kansas City National Security Campus is operated and managed by Honeywell Federal Manufacturing Technologies, LLC under contract number DE-NA0002839.

关键词： 3D printers

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Analysis of three-element zoom systems for laser beam expanders with tunable-focus lenses 16

Analysis of three-element zoom systems for laser beam expand...

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conference on current developments in lens design and optical engineering XVI

作者： Kulmon, Pavel Miks, Antonin Novak, Pavel Novak, Jiri Czech Tech Univ Fac Civil Engn Dept Phys Prague 16629 Czech Republic

ISBN: (纸本)9781628417449

Our work is focused on the problem of a theoretical analysis of imaging properties and an initial optical design of a three-element zoom optical system for laser beam expanders using lenses with a tunable focal length. Equations that enable to calculate basic paraxial properties and parameters of such optical systems are derived Finally, the derived equations are applied on an example of calculation of parameters of the three-element zoom system for the laser beam expander.

关键词： geometric optical design first-order optics zoom lenses laser beam expander Gaussian beam tunable-focus lenses

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Ultra-compact hourglass lens for integrated cameras 16

Ultra-compact hourglass lens for integrated cameras

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conference on current developments in lens design and optical engineering XVI

作者： Rezaei, Mohsen Nia, Iman Hasani Bonakdar, Alireza Mohseni, Hooman Northwestern Univ Dept Elect Engn & Comp Sci Bioinspired Sensors & Optoelect Lab BISOL Evanston IL 60208 USA

ISBN: (纸本)9781628417449

An ultra-small telecentric lens with sub-millimeter thickness is proposed. This lens with 0.2 numerical aperture and high field of view is a good candidate to be used in multi-aperture super resolution imagers. Point spread function and the telecentricity of the lens is extracted numerically and measured experimentally. The ray-optics simulation results show nearly diffraction limited performance for the lens.

关键词： Cameras Imaging systems Point spread functions Silicon Image sensors lens design Infrared cameras Modulation transfer functions Super resolution Sensors

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Recent experience with design and manufacture of cine lenses 16

Recent experience with design and manufacture of cine lenses

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conference on current developments in lens design and optical engineering XVI

作者： Thorpe, Michael D. Dalzell, Kristen E. Raytheon ELCAN Opt Technol Midland ON Canada

ISBN: (纸本)9781628417449

Modern cine lenses require a high degree of aberration correction over a large and ever expanding image size. At low to medium volume production levels, these highly corrected designs also require a workable tolerance set and compensation scheme for successful manufacture. In this paper we discuss the design and manufacture of cine lenses with reference to current designs both internal and in the patent literature and some experience in design, tolerancing and manufacturing these lenses in medium volume production.

关键词： lens design compensators manufacturability cine

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Comparison of Geometrical and Diffraction optical Transfer Functions 16

Comparison of Geometrical and Diffraction Optical Transfer F...

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conference on current developments in lens design and optical engineering XVI

作者： Mahajan, Virendra N. Antonio Diaz, Jose Univ Arizona Coll Opt Sci Tucson AZ 85721 USA Univ Granada Dept Opt E-18071 Granada Spain

ISBN: (纸本)9781628417449

The geometrical and diffraction point-spread functions of an optical imaging system have been reviewed and compared in the past [V. N. Mahajan, "Comparison of geometrical and diffraction point-spread functions," SPIE Proc. 3729, 434-445 (1999)]. In this paper, we review and compare its corresponding optical transfer functions. While the truth lies with the diffraction OTF, it is considered easier and quicker to calculate the geometrical Oil, especially for large aberrations. We briefly describe the theory of the two OTFs, and explore the range of spatial frequencies and the magnitude of the primary aberrations over which the geometrical OTF may provide a reasonable approximation of the diffraction OTF.

关键词： optical transfer functions Monochromatic aberrations Spatial frequencies Diffraction Actinium Imaging systems Geometrical optics optical imaging Modulation transfer functions Fourier transforms

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