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检索条件"任意字段=Conference on Computational Optics Held as Part of Part of SPIE Optical Systems Design Conference"

共 338 条记录，以下是131-140 订阅

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design of waveguide eyeglass for full-color display with large field of view

Design of waveguide eyeglass for full-color display with lar...

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computational optical Sensing and Imaging, COSI 2020 - part of Imaging and Applied optics Congress 2020

作者： Shi, Xueliang Liu, Juan Xiao, Jiasheng Han, Jian Beijing Engineering Research Center for Mixed Reality and Advanced Display School of Optics and Photonics Beijing Institute of Technology Beijing100081 China Key laboratory of information system and technology Beijing institute of control and electronic technology Beijing100038 China

A waveguide eyeglass system integrating freeform elements and volume gratings have been proposed and designed. The simulation results show that the hybrid system can show full color images with FOV 31.56°×24... 详细信息

ISBN: (纸本)9781557528209

关键词： Hybrid systems

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Beam propagation through atmospheric turbulence using an altitude-dependent structure profile with non-uniformly distributed phase screens 32

Beam propagation through atmospheric turbulence using an alt...

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conference on Free-Space Laser Communications XXXII part of spie LASE conferences at Photonics West

作者： Chahine, Yousef Tedder, Sarah A. Vyhnalek, Brian E. Wroblewski, Adam C. NASA Glenn Res Ctr Cleveland OH 44135 USA

ISBN: (纸本)9781510633087

Modeling the effects of atmospheric turbulence on optical beam propagation is a key element in the design and analysis of free-space optical communication systems. Numerical wave optics simulations provide a particularly useful technique for understanding the degradation of the optical field in the receiver plane when the analytical theory is insufficient for characterizing the atmospheric channel. Motivated by such an application, we use a split-step method modeling the turbulence along the propagation path as a series of thin random phase screens with modified von Karman refractive index statistics using the Hufnagel-Valley turbulence profile to determine the effective structure constant for each screen. In this work, we employ a space-to-ground case study to examine the irradiance and phase statistics for both uniformly and non-uniformly spaced screens along the propagation path and compare to analytical results. We find that better agreement with the analytical theory is obtained using a non-uniform spacing with the effective structure constant for each screen chosen to minimize its contribution to the scintillation in the receiver plane. We evaluate this method as a flexible alternative to other standard layered models used in astronomical imaging applications.

关键词： Wave optics atmospheric turbulence phase screen Hufnagel-Valley

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The GMT Telescope Metrology System: easing the complexity of initial and operational alignment and increasing observing efficiency 8

The GMT Telescope Metrology System: easing the complexity of...

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conference on Ground-Based and Airborne Telescopes VIII part of spie Astronomical Telescopes + Instrumentation conference

作者： Sitarski, Breann Rakich, Andrew Chiquito, Hugo Rosenthal, Wylie Pires, Priscila Thompson, Peter Aguayo, Francisco Schoenell, William Schurter, Patricio Brossus, Glenn Conan, Rodolphe Bouchez, Antonin Angeli, George Beifus, Keath Lam, King-Ming Gardner, Paul Thomas, David GMTO Corp 465 N Halstead StSuite 250 Pasadena CA 91107 USA Mersenne Opt Consulting 41 Rimu Rd Paraparaumu 5032 New Zealand Univ Sao Paulo Dept Astron IAG BR-05508900 Sao Paulo Brazil

ISBN: (纸本)9781510636781

The Giant Magellan Telescope will be a 25.4-m visible and infrared telescope at Las Campanas Observatory. The optical design consists of 7 8.4-m primary mirror segments that reflect light to 7 secondary mirror segments in a doubly segmented direct Gregorian configuration. Each mirror pair must be coaligned and co-boresighted. During operations, the alignment of the optical components will deflect due to variations in temperature, gravity-induced structure flexure of the mount, and, on a scale relevant to phasing, vibrations. The doubly segmented nature and size of the GMT will create a novel set of challenges for initial assembly, integration, and verification and maintaining high-precision alignment of the optical elements during operations. GMT is developing a Telescope Metrology System (TMS) that uses 3D laser metrology systems to decrease the complexity of alignment and increase observatory efficiency. This paper discusses the 4 subsystems of TMS as well as their operational modes.

关键词： 3D metrology telescope alignment pointing models absolute distance interferometry differential distance measuring interferometry active optics

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ELT design Progress: the Main Structure 8

ELT Design Progress: the Main Structure

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conference on Ground-Based and Airborne Telescopes VIII part of spie Astronomical Telescopes + Instrumentation conference

作者： Colussi, Leo Colussi, Marco Franceschini, Gianmarco Martinez, Pascal Kraus, Maximilian Cimolai SpA Corso Lino Zanussi 26 I-33080 Porcia Italy ESO Karl Schwarzschildstr 2 D-85748 Garching Germany

ISBN: (纸本)9781510636781

The Main Structure (MS) of the Extremely Large Telescope (ELT) is a 40 m class optical, near and mid-infrared telescope, under construction at Cerro Armazones, in the Chilean Andes. The MS is characterized by an Alt-Azimuth mounting weighting about 3700 t. It is divided in three major sub-systems: the Azimuth tracks, fixed to a concrete pier, which sustain the whole telescope weight;the Azimuth Structure, which allows the rotation around the vertical axis and sustain the Altitude Structure;the Altitude Structure, which allows the rotation around the horizontal axis. The MS consists in a steel space-frame structure, highly optimized to guarantee dynamical requirements and system level performances in general, not least pointing stability and tracking capabilities, reducing the rotating mass as much as possible. A fundamental design constraint has been the need for minimizing repeatable and non-repeatable deflections, particularly for the Altitude Structure, that hosts the segmented Ml mirror unit and all the main optics. Care has also been taken to guarantee survival conditions, particularly in the design of an effective seismic isolation system, capable to adequately limit Hosted Units (HU) accelerations and deformations. Finally, the major design challenge, in general, has been the need to design the system, having its overall dimensions and masses characteristics of large civil structures, like modern steel buildings and sports arenas, in order to be compatible with the strict requirements typical of extremely high precision machines and telescopes.

关键词： ELT Telescope Main Structure Direct Drive Encoder Steel Structure HBS Tracks

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The Infrared Imaging Spectrograph (IRIS) for TMT: final software design update 6

The Infrared Imaging Spectrograph (IRIS) for TMT: final soft...

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conference on Software and Cyberinfrastructure for Astronomy VI held as part of spie Astronomical Telescopes and Instrumentation conference

作者： Chapin, Edward L. Dunn, Jennifer Nakamoto, Takashi Sohn, Jiman Simon Surya, Arun Johnson, Chris Wright, Shelley Zonca, Andrea Andersen, David Chisholm, Eric Gillies, Kim Hayano, Yutaka Herriot, Glen Kerley, Dan Larkin, James Suzuki, Ryuji Natl Res Council Herzberg 5071 W Saanich Rd Victoria BC V9E 2E7 Canada Natl Astron Observ Japan 2-21-1 Osawa Mitaka Tokyo 1818588 Japan Univ Calif Los Angeles Dept Phys & Astron Los Angeles CA 90095 USA Univ Calif San Diego Ctr Astrophys & Space Sci La Jolla CA 92093 USA Thirty Meter Telescope Int Observ 100 W Walnut St300 Pasadena CA 91124 USA

ISBN: (纸本)9781510636927

The InfraRed Imaging Spectrograph (IRIS) is the first-light client instrument for the Narrow Field Infrared Adaptive optics System (NFIRAOS) on the Thirty Meter Telescope (TMT). Now approaching the end of its final design phase, we provide an overview of the instrument control software. The design is challenging since IRIS has interfaces with many systems at different stages of development (e.g., NFIRAOS, telescope control system, observatory sequencers), and will be built using the newly-developed TMT Common Software (CSW), which provides framework code (Java/Scala), and services (e.g., commands, telemetry). Lower-level software will be written in a combination of Java and C/C++ to communicate with hardware, such as motion controllers and infrared detectors. The overall architecture and philosophy of the IRIS software is presented, as well as a summary of the individual software components and their interactions with other systems.

关键词： instrument software motion control infrared detectors instrument rotators atmospheric dispersion correctors adaptive optics environmental control

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BIBLOS for simulation of the Earth Observation missions

BIBLOS for simulation of the Earth Observation missions

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Radioelectronic systems conference (RSC)

作者： Kedzierawski, Robert Oryszczak, Wojciech Szczepankiewicz, Karolina Camps, Adriano Park, Hyuk Garcia, Pedro A. Barrios GMV Innovating Solut Sp Zoo Ul Hrubieszowska 2 PL-01209 Warsaw Poland Univ Politecn Catalunya UPC CommSensLab UPC C Jordi Girona 1-3 Barcelona Spain Inst Estudis Espacials Catalunya IEEC CTE UPC C Jordi Girona 1-3 Barcelona Spain Estec ESA Keplerlaan 1 NL-2201 AZ Noordwijk Netherlands

ISBN: (纸本)9781510636729

End-to-End Mission Performance Simulators for Earth Observation missions are one of the prominent tools for system design and scientific validation in early mission phases. The European Space Agency has promoted efforts to exploit synergies between activities and reduce engineering costs in mission planning. The main goal of the BIBLOS project is to provide a library of software units called "Building Blocks", or simply "Blocks". These blocks could then be integrated into modules, following the reference architecture developed in the frame of the ARCHEO-E2E project, in order to build an End-to-End Simulator in an efficient manner. The first stage of BIBLOS project, referred to as EOMODEL (or BIBLOS-1) and, focused on Passive optical instruments, was successfully finished (in April 2016) with the geometry, scene generation and instrument modelling of optical imagers, which are one of the most frequent types of passive optical instrument on Earth Observation satellites. BIBLOS-2, which is the second stage of the BIBLOS project, is a currently finished activity with the purpose of expanding the BIBLOS library to include Passive Microwaves instruments and Active Microwaves instruments. Additionally, as part of a continuous improvement process, this second stage of BIBLOS has also updated some of the most computational performance intensive blocks for Passive optical instruments with parallel implementation for Graphic Processing Units. For BIBLOS-2, the Sentinel-1 and MicroWave Imager (MWI) instruments have been selected to develop the building blocks for Active Microwaves and Passive Microwaves instruments respectively. During the BIBLOS-2 stage the full simulation chain has been developed for Passive Microwave, starting from the Geometry Module, through Scene Generation and Instrument Modules and ending at Level 1 Processing Module. For Active Microwave Instruments this stage of the BIBLOS activity is focused on the Geometry Module and the Performance Evaluation Modul

关键词： Earth Observation mission performance simulation microwave systems optical systems synthetic aperture radar conical scanning microwave radiometer

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A variety of range compensating lens designs for active optical systems

A variety of range compensating lens designs for active opti...

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conference on Industrial optical Devices and systems (ODS) as part of the spie optics + Photonics conference

作者： Phenis, Adam Mudge, Jason AMP Opt LLC 13308 Midland Rd 1304 Poway CA 92074 USA Golden Gate Light Optimizat LLC 2912 Diamond St Ste 347 San Francisco CA 94131 USA

ISBN: (数字)9781510629448

ISBN: (纸本)9781510629448

A range compensating lens design in the return channel for active optical systems, e.g., range finders and LiDARs, is detailed and several examples analyzed using raytrace methods. This proposed range compensating lens, which reduces the "one over range squared" attenuation, is described by Mudge [Appl. Opt., 58, 7921-7928, (2019)]. The motivation of the lens is to reduce the return signal with targets (objects) relatively near and boost the signal at far range targets by combining lens elements in parallel rather than in series, as typically done. Using the technique provided in the reference, to include field angle details, a designer can develop a lens requiring a detector with less dynamic range and/or extend the far range limit while maintaining the minimum target distance. We provide discussion to implement this approach along with a variety of examples of this range compensating lens to cover design techniques needed for the return lens desired and include some penalties incurred.

关键词： Lidar Ladar Lens design Active optical systems optical radar optical design Range finder Range compensating lens

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The effect of atmospheric optical turbulence on laser communication systems-part 1, theory 28

The effect of atmospheric optical turbulence on laser commun...

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conference on Sensors and systems for Space Applications XII

作者： Farrell, Thomas C. US Air Force Res Lab Space Vehicles Directorate 3550 Aberdeen Ave SE Kirtland AFB NM 87117 USA

ISBN: (数字)9781510627000

ISBN: (纸本)9781510627000

Laser Communication (lasercom) systems whose beam paths traverse the Earth's atmosphere, in whole or in part, are subject to the effects of optical turbulence: the random variation in the index of refraction due to small temperature variations. These effects include beam tilt, wander, and spreading, as well as scintillation: the variation in intensity across the receiver's aperture plane. These effects can result in fades on the order of milli-seconds or longer, and so are important considerations in the design of lasercom links and systems. Stochastic analysis of optical turbulence has been developed since the 1940's, but formal courses are still relatively rare, particularly courses for the professional lasercom engineer. Much of the literature has been devoted to the effects on imaging and directed energy systems, where analysis of mean effects often suffices. This differs considerably from lasercom, where low probability events, leading to fades, are important. The intent of this paper is to provide a concise but reasonably thorough tutorial on the mathematical theory regarding this subject, presenting the background necessary to analyze the effects of turbulence on lasercom systems. Measures for the correlation of phase and intensity across the receiver's aperture will be developed, as well as the evolution in time. Analytic equations are only valid for mild turbulence, and so wave-optics simulation, a method for predicting the effects of moderate and strong turbulence, will also be discussed. In part 2, we will consider specific lasercom geometries and architectures designed to mitigate fades due to turbulence.

关键词： laser communications optical communications space communications noise sources

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optical system design and integration of the Global Ecosystem Dynamics Investigation Lidar 27

Optical system design and integration of the Global Ecosyste...

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27th Annual conference on Infrared Remote Sensing and Instrumentation held as part of the Annual spie optics and Photonics Symposium

作者： Wake, Shane Ramos-Izquierdo, Luis Eegholm, Bente Dogoda, Peter Denny, Zachary Hersh, Michael Mulloney, Michael Thomes, W. Joe Ott, Melanie N. Jakeman, Hali Poulios, Demetrios Mule, Peter de Leon, Erich Blair, J. Bryan NASA Goddard Space Flight Ctr Greenbelt MD 20771 USA Sigma Space Corp Lanham MD 20706 USA Sci Syst & Applicat Inc Lanham MD 20706 USA Stinger Ghaffarian Technol Inc Greenbelt MD 20770 USA Amer Univ Dept Phys Washington DC 20016 USA

ISBN: (数字)9781510629509

ISBN: (纸本)9781510629509

The Global Ecosystem Dynamics Investigation (GEDI) instrument was designed, built, and tested in-house at NASA's Goddard Space Flight Center and launched to the International Space Station (ISS) on December 5, 2018. GEDI is a multibeam waveform LiDAR (light detection and ranging) designed to measure the Earth's global tree height and canopy density using 8 laser beam ground tracks separated by roughly 600 meters. Given the ground coverage required and the 2 year mission duration, a unique optical design solution was developed. GEDI generates 8 ground sampling tracks from 3 transmitter systems viewed by a single receiver telescope, all while maximizing system optical efficiency and transmitter to receiver boresight alignment margin. The GEDI optical design, key optical components, and system level integration and testing are presented here. GEDI began 2 years of science operations in March 2019 and so far, it is meeting all of its key optical performance requirements and is returning outstanding science.

关键词： GEDI LiDAR waveform multi-beam optical design fiber optics altimeter laser

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Enhanced schlieren imaging applied in heat and air jet visualizations: A wave propagation-based model 3

Enhanced schlieren imaging applied in heat and air jet visua...

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3rd International conference on Photonics and optical Engineering

作者： Oca, Gilbert M. Almoro, Percival F. Univ Philippines Diliman Natl Inst Phys Quezon City 1101 Philippines

ISBN: (数字)9781510627802

ISBN: (纸本)9781510627802

Refractive index variations caused by temperature or pressure gradients in transparent fluids are invisible to the naked eye. Schlieren effect reveals this variation using refraction and the knife-edge method. High contrast schlieren images are important in the analyses of fluid flow, gas density, shockwaves, heat transfer, flames, ballistics, leak detection and other applications. The neglect of physical or wave theory in schlieren technique leads to erroneous results in some circumstance. Specifically, a study had mathematically shown that illumination is fairly uniform over large part of the field but suddenly increases at the edge and is fairly appreciable for some way outside the actual physical boundary of the aperture. This bright edge is noticeable in all schlieren systems whereas a geometrical optics would lead to a uniformly illuminated field. Geometric ray-tracing codes are useful for optical design, but they cannot describe the key role of diffraction in the formation of schlieren image. In this study, a wave propagation-based model of the schlieren technique is proposed. Compared to the ray optics approach, the proposed model provides valuable insights and visualization of fluid flow dynamics Some predictions of the model will be confirmed through experimental demonstrations. Setup parameters are also optimized resulting in enhanced resolution of schlieren images.

关键词： Schlieren devices Reflection and refraction Wave optics Wave propagation Fourier optics computational methods in fluid dynamics

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