'Wavefront' diaporamas de présentation

Direct Imaging of Exoplanets

1.4k views • 112 slides

Direct Imaging of Exoplanets

1.25k views • 105 slides

Direct Imaging of Exoplanets

1.14k views • 95 slides

Direct Imaging of Exoplanets

1.13k views • 95 slides

Wavefront Sensing II

916 views • 75 slides

Aberrometry for the Common Joe

Aberrometry for the Common Joe. Thomas O. Salmon, OD, PhD, FAAO. 8/19/11 Revision. Basic teaching objectives. What are aberrations? What are aberrometers? How do they work? How do we interpret the data? How can you diagnose abnormal values?. 1. What are aberrations?.

1.12k views • 54 slides

Aberrometry for the Common Joe

Aberrometry for the Common Joe. Thomas O. Salmon, OD, PhD, FAAO. 8/19/11 Revision. Basic teaching objectives. What are aberrations? What are aberrometers? How do they work? How do we interpret the data? How can you diagnose abnormal values?. 1. What are aberrations?.

869 views • 52 slides

An Introduction to Adaptive Optics Presented by Julian C. Christou Gemini Observatory

An Introduction to Adaptive Optics Presented by Julian C. Christou Gemini Observatory. Gemini North in action. An AO Outline. Turbulence Atmospheric turbulence distorts plane wave from distant object. How does the turbulence distort the wavefront? Wavefront Sensing

820 views • 51 slides

Adaptive Optics Nicholas Devaney GTC project, Instituto de Astrofisica de Canarias

Adaptive Optics Nicholas Devaney GTC project, Instituto de Astrofisica de Canarias. 1. Principles 2. Multi-conjugate 3. Performance & challenges. Outline. Background (reminder) Concept of Adaptive Optics Gain in Image quality Components Designing a system Limitations.

592 views • 51 slides

An Introduction to Adaptive Optics Julian C. Christou, Gemini Observatory

An Introduction to Adaptive Optics Julian C. Christou, Gemini Observatory With added figures from Andrei Tokovinin (CTIO). Turbulence Atmospheric turbulence distorts plane wave from distant object. How does the turbulence distort the wavefront? Wavefront Sensing

494 views • 46 slides

Atmospheric turbulence

Atmospheric turbulence. Eric Gendron. Wavefront, and image. The energy (= light rays) propagates orthogonally to the wavefront. no real convergence point. convergence point = centre of the sphere. non spheric wavefront. spherical wavefront. Aberrations.

2.58k views • 42 slides

A New Definition of Refraction: Basics and Beyond

A New Definition of Refraction: Basics and Beyond. Austin Roorda, Ph.D. Unversity of Houston College of Optometry. First use of Optics as Vision Aids. reading stones from 1000 AD. 1284 Salvino D'Armate built the first spectacles which were used as reading glasses.

602 views • 38 slides

Corner Rafts

Corner Rafts. LSST Camera Review SLAC Oct. 14, 2008 Scot Olivier LLNL. Corner Raft Assemblies: Reference Design. Four corner rafts are located in the corners of the focal plane Corner rafts contain wavefront sensors and guide sensors

604 views • 37 slides

Towards Strehl-Optimal Adaptive Optics Control

Towards Strehl-Optimal Adaptive Optics Control. Donald Gavel, Donald Wiberg, Center for Adaptive Optics, U.C. Santa Cruz Marcos Van Dam, Lawrence Livermore National Laboaratory. The goal of adaptive optics is to Maximize Strehl. Piston-removed atmospheric phase:. Phase correction by DM:.

601 views • 37 slides

474 views • 32 slides

Head Waves, Diving Waves and Interface Waves at the Seafloor

Head Waves, Diving Waves and Interface Waves at the Seafloor. Ralph Stephen, WHOI ASA Fall Meeting, Minneapolis October 19, 2005. MOTIVATION

303 views • 30 slides

LSST Wavefront Sensing

LSST Wavefront Sensing. Bo Xin Systems Analysis Scientist (LSSTPO). Chuck Claver , Ming liang , Srinivasan Chadrasekharan , George Angeli (LSST wavefront sensing team). LSST Active Optics & Wavefront Sensing. LSST Active Optics System (AOS): Maintain system alignment

538 views • 27 slides

US TRENDS IN REFRACTIVE SURGERY: 2002 ASCRS SURVEY

US TRENDS IN REFRACTIVE SURGERY: 2002 ASCRS SURVEY. Richard J. Duffey, MD David Leaming, MD San Francisco: April 12, 2002. 2002 SURVEY. Sept. mailing to 5000 U.S. members of ASCRS 860 responses representing 17% of the U.S. ASCRS membership

252 views • 25 slides

Parallel Scalability and Efficiency of HEVC Parallelization Approaches

403 views • 22 slides

L . Espandar, MD ; M. D. Mifflin, MD; M. Moshirfar MD, FACS John A. Moran Eye Center,

Prospective comparison of visual outcomes after wavefront-guided PRK versus wavefront-guided LASIK. L . Espandar, MD ; M. D. Mifflin, MD; M. Moshirfar MD, FACS John A. Moran Eye Center, University of Utah, SLC, UT

115 views • 11 slides