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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61-70 订阅

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Laser scanners with polygonal mirrors: Optomechanical analysis and design 20

Laser scanners with polygonal mirrors: Optomechanical analys...

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conference on Electro-optical and Infrared systems - Technology and Applications XX

作者： Duma, Virgil-Florin Duma, Maria-Alexandra Aurel Vlaicu Univ Arad 3OM Optomechatron Grp 77 Revolutiei Ave Arad 310130 Romania Polytech Univ Timisoara Doctoral Sch 1 Mihai Viteazu Ave Timisoara 300222 Romania Univ Groningen Sch Sci & Engn WF Bathoornstr NL-9731 CG Groningen Netherlands

ISBN: (数字)9781510667044

ISBN: (纸本)9781510667037

We report a fully-developed theory of laser scanners with rotational Polygon Mirrors (PMs). The deduced scanning function, velocity, and acceleration of PMs have been deduced and discussed in comparison to those of Galvanometer Scanners (GSs). All other characteristic parameters have been obtained, including angular and linear field-of-view (FOV), as well as duty cycle [Proc. of the Romanian Acad. Series A 18, 25-33, 2017]. Although this developed theory considered the laser beams reduced to a single ray (i.e., the center axis of the beam), the specific approach has allowed further on for a complete analysis for scanning laser beams with finite diameters. The multi-parameter optomechanical analysis of these PM functions was performed as well, considering all constructive and functional parameters [Appl. Sci. 12, 5592 (2022)]. The non-linearity of scanning functions (i.e., the non-constant scanning velocities) has been approached. In order to linearize the PM or GS scanning function, a two supplemental mirrors device was developed. This increases the distance between the PM and its objective lens within a reasonable dimension of the system, by folding the scanned laser beam. Rules-of-thumb have been obtained for the design of these scanning heads. The optical part has been completed with a Finite Element Analysis (FEA) of rotational PMs, assessing their structural integrity. An optomechanical design scheme completes the PM scanning heads study, highlighting the links between optical and mechanical aspects. This type of scheme can be utilized for other optomechanical scanners, as well.

关键词： laser scanners polygon mirrors (PMs) galvanometer scanners (GSs) geometrical optics modeling multi-parameter analysis Finite Element Analysis (FEA) optomechatronics

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MAORY/MORFEO@ELT: Calibration Unit overview 8

MAORY/MORFEO@ELT: Calibration Unit overview

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conference on Adaptive optics systems VIII part of spie Astronomical Telescopes and Instrumentation conference

作者： Di Rico, Gianluca Di Antonio, Ivan Rodeghiero, Gabriele Valentini, Angelo Dolei, Mauro Goncharov, Alexander Devaney, Nicholas Busoni, Lorenzo Oberti, Sylvain Riva, Marco Farinato, Jacopo Cascone, Enrico Chinellato, Simonetta Cianniello, Vincenzo D'Auria, Domenico Di Caprio, Vincenzo Eredia, Christian Giro, Enrico Magrin, Demetrio Portaluri, Elisa Redaelli, Edoardo Salasnich, Bernardo Ciliegi, Paolo Di Giammatteo, Ugo Ist Nazl Astrofis Trieste Italy Adapt Opt Natl Lab ADONI Trieste Italy NUIG Galway Ireland ESO Garching Garching Germany

ISBN: (纸本)9781510653528;9781510653511

The Calibration Unit (CU) of MORFEO, the Multiconjugate adaptive optics Relay For ELT Observations (formerly known as MAORY), is a complex optomechanical subsystem to project on the telescope NGS and LGS focal planes a large number of light sources at different wavelengths. These sources are needed to run calibration, verification and test procedures on MORFEO at the Extremely Large Telescope (ELT). This subsystem will play a critical role not only during operations, but also during the Assembly, Integration and Verification (AIV) phase in Italy, when it will be used in the Test Unit (TU) configuration, including a Deformable Mirror (DM), and in Chile. We present a general overview of the CU preliminary design, focusing on the reasons that led to the current optomechanical configuration and providing a more detailed description of the calibration sources, the light transmission chain and the electronics.

关键词： Adaptive optics Instrument Calibration optical Fibers Visible and Infrared Instrumentation ELT

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Wavefront sensing over a 20-arcmin field in the ULTIMATE-Subaru Ground Layer Adaptive optics system 8

Wavefront sensing over a 20-arcmin field in the ULTIMATE-Sub...

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conference on Adaptive optics systems VIII part of spie Astronomical Telescopes and Instrumentation conference

作者： Martinez, Noelia Herrald, Nicholas Chandler, David Haynes, Dionne Kruse, Andrew Ramasundara, Wasantha Rigaut, Francois Bernard, Julien Tom Travouillon, Tony Vaughn, Israel Minowa, Yosuke Ono, Yoshito Tanaka, Yoko Terao, Koki D'Orgeville, Celine Australian Natl Univ Res Sch Astron & Astrophys Mt Stromlo Observ Cotter Rd Weston 2611 Australia Natl Astron Observ Japan Subaru Telescope Hilo HI USA

ISBN: (纸本)9781510653528;9781510653511

The ULTIMATE Ground Layer Adaptive optics (GLAO) system is part of ULTIMATE-Subaru, the next generation facility instrumentation project at the Subaru telescope in Hawaii. GLAO is led by the Subaru Telescope in collaboration with Tohoku University, Academia Sinica Institute of Astronomy and Astrophysics (ASIAA), and the Australian National University (ANU). ANU is currently designing the Laser Guide Star Facility and the Wavefront Adaptor Flange with four Laser Guide Star wavefront sensors, and four Natural Guide Star wavefront sensors. The GLAO Wavefront Adaptor Flange will provide Adaptive optics capability to the wide-field imager (WFI) instrument to be installed at the Subaru Cassegrain focus in 2027. Four Laser Guide Star wavefront sensors mounted over a fabricated steel structure enable the acquisition of LGS asterisms of up to 20 arcmin in diameter. Each WFS has been designed to also account for the telescope optical aberrations and the non-telecentricity. The NGS instance consists of four Natural Guide Star wavefront sensors for tip-tilt and focus measurement. In this paper, we present an overview of the GLAO Wavefront Adaptor Flange including the preliminary design for the opto-mechanical assembly of both LGS and NGS instances, and the mechanisms control system that enables fine acquisition of the guide stars over the wide patrol field of the GLAO system.

关键词： Wavefront sensing Ground Layer Adaptive optics Subaru telescope ULTIMATE-Subaru

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design of projection-based augmented reality system using holographic screen display 23

Design of projection-based augmented reality system using ho...

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conference on Current Developments in Lens design and optical Engineering XXIII part of spie optics and Photonics conference

作者： Nishikawa, Jun Nakamura, Tomoharu Sony Grp Corp R&D Ctr Atsugi TEC 4-14-1 Asahi Cho Atsugi Kanagawa 2430014 Japan

ISBN: (纸本)9781510654198;9781510654181

Holographic display elements (HOEs) with a high diffraction efficiency and size enlargement have been developed since 2019. To achieve high brightness and low haze, unprecedented optical systems have been proposed with a uniform chief ray angle of 0 degrees in the x-section and 70 degrees in the y-section of the HOEs. A 360 degrees cylindrical holographic screen display (CHSD) was obtained by providing a large tilt to the surface shape near the optical axis. This was done using a first-order odd aspherical coefficient for the light flux from a refractive optical system (RO). A flat holographic screen display (FHSD) is a compact, high-performance display that uses three decentered and tilted freeform mirrors to route light flux from the RO in a ball-like form. Prototyping also proposes the possibility of an augmented reality system that takes advantage of the high transparency. The design for further miniaturization while maintaining optical performance was also discussed, in which the size of the first mirror was reduced by reducing the half-field angle of the RO to approximately 6 degrees. Furthermore, by increasing the negative power of the second mirror, the small size could be maintained The size of the last mirror was dependent on the screen size and could not be reduced. By laying down the posture of this mirror, we were able to halve the size reduction in the vertical direction. In this paper, lens designs for CHSDs and FHSDs are reported. The potential of this display is also discussed.

关键词： Holographic optical elements augmented reality display freeform mirror projection lens lens design

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Dual U-Nets Autoencoders for Unsupervised Hyperspectral Image Super-resolution

Dual U-Nets Autoencoders for Unsupervised Hyperspectral Imag...

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2023 International conference on Remote Sensing, Mapping, and Geographic systems, RSMG 2023

作者： Li, Jiaxin Zheng, Ke Ni, Li Gao, Lianru Key Laboratory of Computational Optical Imaging Technology Aerospace Information Research Institute Chinese Academy of Sciences Beijing100094 China College of Resources and Environment University of Chinese Academy of Sciences Beijing100049 China School of Geography and Environment Liaocheng University Shandong Liaocheng252059 China

ISBN: (纸本)9781510668898

Super-resolution is a burgeoning technique to enhance the spatial resolution of hyperspectral images (HSI) by fusing them with an auxiliary high-resolution multispectral image (MSI). However, most deep learning-based methods are based on supervised paradigm, which rely on large number of training triplets. Considering their deficiency, we propose a dual U-Nets autoencoders network inspired by the theory of spectral mixing, which purely operates on one pair of HSI-MSI for network optimization. Specifically, two coupled autoencoders are deployed as the backbone of our method, aiming to extract latent endmember and abundance of target image. To enrich the representation ability and enhance the interaction of two data, we design a novel dual U-Nets architecture for the encoder part by a parameter-shared strategy. Experiments in Chikusei dataset demonstrate the effectiveness of out method when compared with other state-of-the-art methods. © 2023 spie.

关键词： Image enhancement

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design and Implementation of Trusted Production Lines Based on Active Metric Control Technology for optical Access Networks 14

Design and Implementation of Trusted Production Lines Based ...

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14th International conference on Information optics and Photonics, CIOP 2023

作者： Xie, Yutong Shi, Chunzhu Li, Mojun Zhang, Hongbin Wei, Lizhuo Cybersecurity Institute The 6th Research Institute of China Electronics Corporation Beijing102209 China

ISBN: (纸本)9781510671744

Although the optical access network based on industrial IoT can provide large connections and high bandwidth for smart factory construction, it still lacks an effective guarantee in information security transmission and control and is difficult to cope with new challenges such as accelerated penetration of security threats and complex and diverse attack methods. To ensure the secure authentication transmission of the devices connected to the optical access network in the smart factory, an automated assembly line with a trusted chain of"host computer - trusted security controller" in the industrial IoT scenario is designed, the core of which is a trusted industrial controller with both a host system and a trusted subsystem, in which the trusted subsystem is encapsulated with self-designed SHA-2 based bi-directional verification integrity metric algorithm, which dynamically measures the integrity of system firmware and project files, and has active control logic to control the start-up behavior of the host system based on the integrity metric results while using a digital signature to transfer the trusted chain to the host computer. We have verified the cold start time, integrity metric rate, and attack resistance of the trusted industrial controller, and the experiments show that the controller has better usability with a cold start time of fewer than 60 seconds, integrity metric rate >1MB/S, and better attack resistance than the non-trusted controller. © 2023 spie.

关键词： Computer control systems

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An Updated Preliminary optical design and Performance analysis of the Planetary systems Imager Adaptive optics System 8

An Updated Preliminary Optical Design and Performance analys...

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conference on Adaptive optics systems VIII part of spie Astronomical Telescopes and Instrumentation conference

作者： Jensen-Clem, Rebecca Hinz, Philip M. van Kooten, M. A. M. Fitzgerald, Michael P. Sallum, Steph Mazin, Benjamin A. Chun, Mark Millar-Blanchaer, Maxwell A. Skemer, Andy Wang, Ji Stelter, R. Deno Guyon, Olivier Univ Calif Santa Cruz Santa Cruz CA 95064 USA Univ Calif Observ Santa Cruz CA USA Univ Calif Los Angeles Los Angeles CA USA Univ Calif Irvine Irvine CA USA Univ Calif Santa Barbara Santa Barbara CA USA Univ Hawaii Inst Astron Honolulu HI USA Ohio State Univ Columbus OH USA NAOJ Subaru Telescope Mauna Kea HI USA Univ Arizona Tucson AZ USA NINS AstroBiol Ctr Tokyo Japan

ISBN: (纸本)9781510653528;9781510653511

The Planetary systems Imager (PSI), a proposed instrument suite for the Thirty Meter Telescope (TMT), enables a broad range of extreme-AO, high-contrast observations. PSI is specifically optimized for high contrast exoplanet science from 0.5 to 13 mu m and to that end includes a core near-IR AO system that feeds multiple AO+science instrument subsystems. In this paper, we present a preliminary optical design for the full PSI-AO system, feeding the PSI-Red (2-5 mu m), PSI-Blue (0.5--1.8 mu m), and PSI-10 (8-13 mu m) subsystems. We discuss an initial concept of testing and operations for the system that feeds into the conceptual design. We build on our preliminary end-to-end PSI-Red AO simulation to estimate the raw planet-to-star contrast ratios associated with PSI-Red and extrapolate these results to represent the effects of a PSI-Blue deformable mirror.

关键词： Adaptive optics Coronagraphy Exoplanets

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optical design of a variable beam angle fiber light source 6

Optical design of a variable beam angle fiber light source

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conference on Illumination optics VI held as part of part of spie optical systems design conference

作者： Rehn, Henning Waespi, Marcel Honig, Tobias Forrer, Martin FISBA AG Rorschacher Str 268 CH-9016 St Gallen Switzerland FISBA Photon GmbH Schwarzschildstr 12 D-12489 Berlin Germany

ISBN: (纸本)9781510645936;9781510645929

In the field of endoscope optics we see more and more zoom designs, realized by tuneable lenses, micro actuators or traditional lens movement in rigid endoscopes with a camera sensor. For such devices, a lighting concept that adapts the beam angle to the current field of view of the zoom optics is desirable. In endoscopes, the light is usually transported from a source to the tip by a light guide or fiber bundle.(1) Since it is not feasible to place an optical system at the fiber exit to fulfill the task, one would make use of the fact that a fiber roughly conserves the angular distribution of incident light and transfer the task of variable beam generation to the light source. We present an optical system that performs this task by conventional optical means outside the endoscope. A LED is imaged to the fiber entrance by a system of variable focal length. By choosing the source etendue equal to that of the fiber, it is ensured that the proper magnification of the imaging is accompanied by the specified angular extent. The LED light is first collimated, and the exit pupil of the collimator is imaged by a system of moving and fix lenses. In a final step, we show a design to adapt a colored light source to the variable beam optics.

关键词： Endoscopy Zoom lens Etendue Variable Beam Illumination design Laser-phosphor sources

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Approaching optical metrology with multiple light sources and compressive sensing 2

Approaching optical metrology with multiple light sources an...

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conference on optics and Photonics for Advanced Dimensional Metrology II part of spie Photonics Europe conference

作者： Mueller, Andre F. Falldorf, Claas Bergmann, Ralf B. BIAS Bremer Inst Angew Strahltech GmbH Klagenfurter Str 2 D-28359 Bremen Germany Univ Bremen Fac Phys & Elect Engn Otto Hahn Allee NW1 D-28359 Bremen Germany Univ Bremen MAPEX Otto Hahn Allee NW1 D-28359 Bremen Germany

ISBN: (纸本)9781510651517;9781510651500

Complex optical surfaces such as aspheres and freeforms are used in optical systems to reduce aberrations or to achieve high optical performance with a compact design and less optical surfaces. Due to limited acceptance angles of conventional interferometric techniques, there is still no satisfactory solution for their form measurement that is at the same time precise, flexible, and fast. Often these surfaces are surveyed by pointwise measurement, or the aperture problem is overcome by elaborately compensating wave front deviations either through compensator lenses or computer-generated holograms. Alternatively, several subapertures are used to capture the whole surface. These, however, have to be recorded in sequence since the superposition of multiple independent wave fields cannot be assigned a time-independent wave front. Instead, we present a compressive sensing approach for Multiple Aperture Shear-Interferometry (MArS) which captures multiple overlapping subapertures simultaneously and allows a flexible measurement of aspheres with multi-spot illumination. MArS uses the mutual intensity as the primary measurand which is still well defined for superposed mutually incoherent wave fields. The mutual intensity is sparse in phase space for there are only a finite number of distinct wave fields at every surface point. Utilizing this sparsity, the presented compressive sensing approach avoids superflously large space-bandwidth products and significantly reduces the number of necessary measurements.

关键词： Compressive sampling optical metrology Fourier optics Spatial light modulators Interferometry Shear-Interferometry Coherence Statistical optics

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PSF nowcast using PASSATA simulations - Towards a PSF forecast 8

PSF nowcast using PASSATA simulations - Towards a PSF foreca...

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conference on Adaptive optics systems VIII part of spie Astronomical Telescopes and Instrumentation conference

作者： Turchi, A. Agapito, A. Masciadri, E. Beltramo-Martin, O. Milli, J. Plantet, C. Rossi, F. Pinna, E. Sauvage, J. F. Neichel, B. Fusco, T. INAF Osservatorio Astrofisico Arcetri Lgo Enrico Fermi 5 Florence Italy LAM Lab Astrophys Marseille UMR 7326 F-13388 Marseille France Off Natl Etud & Rech Aerosp B P 72 F-92322 Chatillon France IPAG Inst Planetol & Astrophys Grenoble 414 Rue Piscine F-38400 St Martin Dheres France

ISBN: (纸本)9781510653528;9781510653511

Characterizing the PSF of adaptive optics instruments is of paramount importance both for instrument design and observation planning/optimization. Simulation software, such as PASSATA, have been successfully utilized for PSF characterization in instrument design, which make use of standardized atmospheric turbulence profiles to produce PSFs that represent the typical instrument performance. In this contribution we study the feasibility of using such tool for nowcast application (present-time forecast), such as the characterization of an on-sky measured PSF in real observations. Specifically we will analyze the performance of the simulation software in characterizing the real-time PSF of two different state-of-the-art SCAO adaptive optics instruments: SOUL at the LBT, and SAXO at the VLT. The study will make use of on-sky measurements of the atmospheric turbulence and compare the results of the simulations to the measured PSF figures of merit (namely the FHWM and the Strehl Ratio) retrieved from the instrument telemetry in real observations. Our main goal in this phase is to quantify the level of uncertainly of the AO simulations in reproducing real on-sky observed PSFs with an end-to-end code (PASSATA). In a successive phase we intend to use a faster analytical code (TIPTOP). This work is part of a wider study which aims to use simulation tools joint to atmospheric turbulence forecasts performed nightly to forecast in advance the PSF and support science operations of ground-based telescopes facilities. The 'PSF forecast' option might therefore be added to ALTA Center or the operational forecast system that will be implemented soon at ESO.

关键词： simulations adaptive optics forecast atmosphere optical turbulence

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