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检索条件"任意字段=Conference on Advances in Adaptive Optics II"

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Innovations and advances in instrumentation at the W. M. Keck Observatory, vol. ii 9

Innovations and advances in instrumentation at the W. M. Kec...

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conference on Ground-Based and Airborne Instrumentation for Astronomy IX

作者： Kassis, Marc Allen, Steven L. Alverez, Carlos Baker, Ashley Banyal, Ravinder K. Bertz, Robert Beichman, Charles Brown, Aaron Brown, Matthew Bundy, Kevin Cabak, Gerald Cetre, Sylvain Chin, Jason Chun, Mark R. Cooke, Jeff Delorme, Jacques Deich, William Dekany, Richard G. Devenot, Mark Doppmann, Greg Edelstein, Jerry Fitzgerald, Michael P. Fucik, Jason R. Gao, Maodong Gibson, Steve Gillingham, Peter R. Gomez, Percy Gottschalk, Colby Halversonm, Sam Hill, Grant Hinz, Philip Holden, Bradford P. Howard, Andrew W. Jones, Tucker Jovanovic, Nemanja Kirby, Evan Krishnan, Shanti Kupke, Renate Lanclos, Kyle Larkin, James E. Leifer, Stephanie D. Lewis, Hilton A. Lilley, Scott Lu, Jessica R. Lyke, James E. MacDonald, Nicholas Martin, Christopher Mather, John Matuszewski, Mateusz Mawet, Dimitri McCarney, Ben McGurk, Rosalie Marin, Eduardo Millar-Blanchaer, Maxwell A. Nance, Craig Nash, Reston B. Neill, James D. O'Meara, John M. Peretz, Eliad Poppett, Claire Konopacky, Quinn Radovan, Matthew V. Ragland, Sam Rider, Kodi Roberts, Mitsuko Rockosi, Connie Roy, Arpita Rubenzahl, Ryan Sallum, Stephanie Sandford, Dale Savage, Maureen Shen, Boqiang Simha, Sunil Skemer, Andy J. Steidel, Charles C. Stelter, Deno Surendran, Avinash Thorne, James Walawender, Josh Westfall, Kyle B. Wizinowich, Peter Vahala, Kerry Wright, Shelley Wold, Truman Yeh, Sherry WM Keck Observ 65-1120 Mamalahoa Hwy Kamuela HI 96743 USA Univ Calif Observ 1156 High St Santa Cruz CA 95064 USA CALTECH 1200 E Calif Blvd Pasadena CA 91125 USA Indian Inst Astron 2nd Block100 Feet Rd Bengaluru 560034 Karnataka India NASA Exoplanet Sci Inst Pasadena CA 91125 USA Univ Calif San Diego 9500 Gilman Dr La Jolla CA 92039 USA Univ Calif Santa Cruz 1156 High St Santa Cruz CA 95064 USA Univ Hawaii Inst Astron 640 N Aohoku Pl Hilo HI 96720 USA Swinburne Univ Technol John St Hawthorn Vic 3122 Australia Univ Calif Berkeley Space Sci Lab 7 Gauss Way Berkeley CA 94720 USA Univ Calif Los Angeles Box 951547 Los Angeles CA 90095 USA Macquarie Univ Astralis AAO Macquarie 105 Delhi Rd N Ryde NSW 2113 Australia NASA Jet Prop Lab 4800 Oak Grove Dr Pasadena CA 91109 USA Univ Calif Davis 1 Shields Ave Davis CA 95616 USA 225 Nieuwland Sci Hall Notre Dame IN 46556 USA Aerosp Corp 2310 E El Segundo El Segundo CA 90245 USA Univ Calif Berkeley Campbell Hall Berkeley CA 94720 USA NASA Goddard Space Flight Ctr Greenbelt MD 20771 USA Univ Calif Santa Barbara Santa Barbara CA 93106 USA Space Telescope Sci Inst 711 W 40th St Baltimore MA USA Univ Calif Irvine 4129 Frederick Reines Hall Irvine CA 92697 USA

ISBN: (纸本)9781510653504;9781510653498

Since the start of science operations in 1993, the twin 10-meter W. M. Keck Observatory (WMKO) telescopes have continued to maximize their scientific impact and to produce transformative discoveries that keep the observing community on the frontiers of astronomical research. Upgraded capabilities and new instrumentation are provided through collaborative partnerships with Caltech, the University of California, and the University of Hawaii instrument development teams, as well as industry and other organizations. The observatory adapts and responds to the observers' evolving needs as defined in the observatory's strategic plan periodically refreshed in collaboration with the science community. This paper summarizes the performance of recently commissioned infrastructure projects, technology upgrades, and new additions to the suite of instrumentation at the observatory. We also provide a status of projects currently in design or development phases, and since we keep our eye on the future, summarize projects in exploratory phases that originate from our strategic plan updated in 2022.

关键词： Infrared Optical Instrumentation Imager Spectrograph Integral Field Laser Guide Star adaptive optics

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Lightweighting strategies for Main Support Structures of ELT instrumentation 4

Lightweighting strategies for Main Support Structures of ELT...

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conference on advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV

作者： Cianniello, Vincenzo De Caprio, Vincenzo Eredia, Christian Cascone, Enrico Ist Nazl Astrofis INAF Osservatorio Astron Capodimonte Salita Moiariello 16 I-80131 Naples Italy Univ Napoli Federico II Dipartimento Ingn Ind DII Via Claudio 21 I-80125 Naples Italy

ISBN: (纸本)9781510636903

This paper outlines an overview of the mechanical design of the support structure and optical bench, for ELT (Extremely Large Telescope) class of instrument utilizing standard materials. It also provides a presentation of a possible strategy to lighten this mechanical design. The mass requirements for the new class of astronomical instruments, for the Extremely Large Telescope, put tight constraints for the mechanical design of said instruments. While aluminum or steel are still the main materials that are usually employed for main support structures, carbon fiber reinforced polymer (CFRP) offers a wide range of promising possibilities. The interesting properties of carbon fibers make composite materials reinforced with carbon fibers ideal for numerous applications with high mechanical performance and low weight requirements. Carbon fibers have high strength and low weight (high strength-to-weight ratio). Furthermore, carbon fibers have a high modulus of elasticity and low thermal expansion, they are corrosion resistant and their density is lower than that of aluminum: thus, they are ideal for "light applications". In this paper two possible mechanical designs for a "large optical bench", based on different materials, are presented and compared: structural steel and carbon fiber reinforced polymer (CFRP). The models are validated through FEM Analysis approach, utilizing CAD and CAE software.

关键词： ESO ELT MAORY AO adaptive optics FEM FE CAD CAE CFRP Mechanical Structure Bench

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Toward active x-ray telescopes ii

Toward active x-ray telescopes II

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conference on adaptive X-Ray optics ii

作者： O'Dell, Stephen L. Aldcroft, Thomas L. Atkins, Carolyn Button, Timothy W. Cotroneo, Vincenzo Davis, William N. Doel, Peter Feldman, Charlotte H. Freeman, Mark D. Gubarev, Mikhail V. Johnson-Wilke, Raegan L. Kolodziejczak, Jeffery J. Lillie, Charles F. Michette, Alan G. Ramsey, Brian D. Reid, Paul B. Sanmartin, Daniel Rodriguez Saha, Timo T. Schwartz, Daniel A. Trolier-McKinstry, Susan E. Ulmer, Melville P. Wilke, Rudeger H. T. Willingale, Richard Zhang, William W. NASA George C Marshall Space Flight Ctr Astrophys Off Huntsville AL 35812 USA

ISBN: (纸本)9780819492203

In the half century since the initial discovery of an astronomical (non-solar) x-ray source, the observation time required to achieve a given sensitivity has decreased by eight orders of magnitude. Largely responsible for this dramatic progress has been the refinement of the (grazing-incidence) focusing x-ray telescope, culminating with the exquisite sub-arcsecond imaging performance of the Chandra X-ray Observatory. The future of x-ray astronomy relies upon the development of x-ray telescopes with larger aperture areas (> 1 m(2)) and comparable or finer angular resolution (< 1 ''). Combined with the special requirements of grazing-incidence optics, the mass and envelope constraints of space-borne telescopes render such advances technologically challenging-requiring precision fabrication, alignment, and assembly of large areas (> 200 m(2)) of lightweight (approximate to 1 kg m(-2) areal density) mirrors. Achieving precise and stable alignment and figure control may entail active (in-space adjustable) x-ray optics. This paper discusses relevant programmatic and technological issues and summarizes current progress toward active x-ray telescopes.

关键词： X-ray telescopes x-ray optics active optics adjustable optics bimorph actuators piezoelectric devices electrostrictive devices magnetostrictive devices

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Liquid Lens: advances in adaptive optics

Liquid Lens: Advances in Adaptive Optics

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conference on Optical Sensors and Biophotonics ii

作者： Casey, Shawn Patrick Shanghai Jiao Tong Univ Sch Life Sci Inst Laser Med Shanghai 200240 Peoples R China

ISBN: (纸本)9780819485588

'Liquid lens' technologies promise significant advancements in machine vision and optical communications systems. Adaptations for machine vision, human vision correction, and optical communications are used to exemplify the versatile nature of this technology. Utilization of liquid lens elements allows the cost effective implementation of optical velocity measurement. The project consists of a custom image processor, camera, and interface. The images are passed into customized pattern recognition and optical character recognition algorithms. A single camera would be used for both speed detection and object recognition.

关键词： Machine Vision optics Pattern Recognition Microfluidic Devices Velocity Detection Liquid Lens Machine Vision Image Processing Optoelectronics

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Ferrofluid deformable mirrors: recent advances and results

Ferrofluid deformable mirrors: recent advances and results

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conference on adaptive optics Systems ii

作者： Brousseau, D. Borra, E. F. Univ Laval Dept Phys Quebec City PQ G1V 0A6 Canada Univ Laval COPL Quebec City PQ G1V 0A6 Canada

ISBN: (纸本)9780819482266

Many technical improvements have been made since we first introduced deformable mirrors that use magnetic liquids (ferrofluids) whose surface are shaped by arrays of small electric coils. We present recent advances and experimental results of a 91-actuator magnetic liquid deformable mirror that uses a novel technique that linearizes their response by placing the array of actuators inside a strong and uniform magnetic field. We show that this improved ferrofluid deformable mirror (FDM) can produce inter-actuator strokes of over 10 mu m, is capable of generating wavefront having peak-to-valley amplitudes of over 60 mu m, and predict that amplitudes greater than 100 mu m are achievable. We also present experimental results showing that these improved FDMs are good candidates for astronomical, vision science, and optical testing applications.

关键词： adaptive optics deformable mirrors liquid optics

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advances in real-time control algorithms

Advances in real-time control algorithms

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conference on adaptive optics Systems ii

作者： Conan, Rodolphe Veran, Jean-Pierre Univ Victoria Dept Mech Engn AO Lab POB 3055 STN CSC Victoria BC V8W 3P6 Canada

ISBN: (纸本)9780819482266

Since the early days, many aspects of adaptive optics (AO) have seen tremendous changes. From the early experimental systems providing low order correction in a tiny patch of sky to todays fully automated specialized system offering correction in a much wider field and/or a much higher degree of correction, the evolution has been remarkable. For example, deformable mirror (DM) technology and wavefront sensing methods have been constantly improved. As well, real-time control algorithms have been greatly refined. This paper will review the different real-time control strategies that have been used with astronomical adaptive optics. They all have in common the same objective, that is the derivation of an optimal command for the deformable mirror(s) in order to get the least amount of residual optical aberrations in the science path. Most of the time, the real-time control algorithm is split in two independent components, the first part performing the wavefront (spatial) reconstruction, the second part performing the temporal control. With the advent of the extremely large telescopes (ELTs), as well as new AO modalities requiring several DMs and wavefront sensors, performing both these tasks in an ever shrinking glimpse of time is even more challenging. We will describe advanced fast and iterative reconstruction methods recently proposed for next generation AO systems. We will show how these algorithms combined with sparse matrices and parallel computing techniques meet the requirements of Extremely Large Telescope (ELT) real time computers.

关键词： adaptive optics Reconstruction algorithms Matrices Computing systems Real-time computing Tomography Control systems Data processing Filtering (signal processing) Digital signal processing

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advances in high-speed imaging by objective-coupled planar illumination microscopy

Advances in high-speed imaging by objective-coupled planar i...

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Frontiers in optics, FiO 2009

作者： Holy, Timothy E. Turaga, Diwakar Washington University School of Medicine St. Louis MO 63110 United States

For measuring neuronal activity, planar illumination microscopy possesses advantages of speed and low phototoxicity. I will describe optical strategies to improve resolution, and present applications measuring neurona... 详细信息

ISBN: (纸本)9781557528780

关键词： High speed imaging Illumination Microscopy Optical aberrations Refractive index Three dimensional imaging Imaging systems (110.0110) Active or adaptive optics (110.1080) Microscopy (180.0180) Fluorescence microscopy (180.2520)

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ACOUSTOOPTICAL PROCESSORS FOR RADIOASTRONOMY

ACOUSTOOPTICAL PROCESSORS FOR RADIOASTRONOMY

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6th conference on advances in Optical Information Processing

作者： LAVROV, AP ESEPKINA, NA MANSYREV, MI MOLODYAKOV, SA SAENKO, ii ST PETERSBURG STATE TECH UNIV DEPT RADIOPHYSST PETERSBURG 195251RUSSIA

ISBN: (纸本)081941544X

Three different acoustooptical (AO) processors for radio-astronomy are described: AO spectrum analyzers, AO image processing system for solar observations and AO dispersion compensator for pulsars observations. Their principles of operation and peculiarities are described. Characteristics of developed setups, results of their laboratory investigations and also their usage on Russian radiotelescopes are given.

关键词： adaptive optics Ions Bragg cells Image processing Signal processing Acousto-optics Radio astronomy Spectrum analysis Observatories Spectrometers

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