Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Catherine M. Ohara"'
Autor:
William K. Wilkie, Samuel C. Bradford, Samuel M. Hoffman, Lee D. Peterson, Catherine M. Ohara, Fang Shi, Greg Agnes
Publikováno v:
53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference20th AIAA/ASME/AHS Adaptive Structures Conference14th AIAA.
Three reflectors have been developed and tested to assess the performance of a distributed network of piezocomposite actuators for correcting thermal deformations and total wave-front error. The primary testbed article is an active composite reflecto
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::657cc71361e22c705b78a92b62d163d8
https://doi.org/10.2514/6.2012-1743
https://doi.org/10.2514/6.2012-1743
Autor:
David C. Redding, Siddarayappa Bikkannavar, Catherine M. Ohara, Scott A. Basinger, John Z. Lou, Fang Shi, Joseph J. Green, David Cohen
Publikováno v:
SPIE Proceedings.
Phase retrieval is an image-based wavefront sensing process, used to recover phase information from defocused stellar images. Phase retrieval has proven to be useful for diagnosis of optical aberrations in space telescopes, calibration of adaptive op
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ebc9bc671726bf0a9681033a368278b0
https://doi.org/10.1117/12.858980
https://doi.org/10.1117/12.858980
Publikováno v:
SPIE Proceedings.
An autonomous wavefront sensing and control software suite (APRC) has been developed as a method to calibrate the internal static errors in the Palomar Adaptive Optics system. An image-based wavefront sensing algorithm, Adaptive Modified Gerchberg-Sa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::403fd7b7e364c5c7b835348647916cd8
https://doi.org/10.1117/12.790676
https://doi.org/10.1117/12.790676
Publikováno v:
Optics letters. 33(3)
We present an adaptive cross-correlation algorithm for a large dynamic range extended-scene Shack-Hartmann wavefront sensor. We show that it accurately measures very fine image shifts over many pixels under a variety of practical imaging conditions.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::148f9c326cfcee7560b40110cc56f113
https://pubmed.ncbi.nlm.nih.gov/18246132
https://pubmed.ncbi.nlm.nih.gov/18246132
Publikováno v:
SPIE Proceedings.
We have developed a new, adaptive cross-correlation (ACC) algorithm to estimate with high accuracy the shift as large as several pixels in two extended-scene images captured by a Shack-Hartmann wavefront sensor (SH-WFS). It determines the positions o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c3ed935d511b12a36f747a81d47d9b83
https://doi.org/10.1117/12.735030
https://doi.org/10.1117/12.735030
Publikováno v:
Adaptive Optics: Analysis and Methods/Computational Optical Sensing and Imaging/Information Photonics/Signal Recovery and Synthesis Topical Meetings on CD-ROM.
We present an adaptive cross-correlation algorithm for large dynamic range extended-scene Shack-Hartmann wavefront sensing. We show that it accurately measures very fine image shifts over many pixels under a variety of practical imaging conditions.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ee6a456cefee756723b871ff8383580b
https://doi.org/10.1364/aopt.2007.jtua7
https://doi.org/10.1364/aopt.2007.jtua7
Autor:
Gary Chanan, Allan Wirth, Andrew Jankevics, Scott T. Acton, Catherine M. Ohara, Mitchell Troy, Tom Gonsiorowski, Fang Shi, Marc Albanese
Publikováno v:
Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter.
The James Webb Space Telescope (JWST) Coarse Phase Sensor utilizes Dispersed Hartmann Sensing (DHS)1 to measure the inter-segment piston errors of the primary mirror. The DHS technique was tested on the Keck Telescope. Two DHS optical components were
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f8a66cd5248b222f0e9242eea948f6b0
https://doi.org/10.1117/12.672055
https://doi.org/10.1117/12.672055
Autor:
Rhonda Morgan, Joseph J. Green, Catherine M. Ohara, Kirill Shcheglov, Erkin Sidick, Jennifer E. Roberts
Publikováno v:
SPIE Proceedings.
We have implemented a testbed to demonstrate wavefront sensing and control on an extended scene using Shack-Hartmann and MGS phase retrieval simultaneously. This dual approach allows for both high sensitivity and high dynamic range wavefront sensing.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::38f04dffdc964f0f80ee7cdcca0db18b
https://doi.org/10.1117/12.627747
https://doi.org/10.1117/12.627747
Autor:
Catherine M. Ohara, Andrew E. Lowman, Jessica A. Faust, Joseph J. Green, Fang Shi, David C. Redding, David Cohen, Scott A. Basinger
Publikováno v:
SPIE Proceedings.
The James Webb Space Telescope (JWST) will use image-based wavefront sensing to align the telescope optics and achieve diffraction-limited performance at 2 µm. The Phase Retrieval Camera (PRC) is a high-accuracy, image-based wavefront sensor that wa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f2570a577e68566046407cf68ea51b16
https://doi.org/10.1117/12.551793
https://doi.org/10.1117/12.551793
Publikováno v:
SPIE Proceedings.
To achieve and maintain the fine alignment of its segmented primary mirror the James Webb Space Telescope (JWST) plans to use focus-diverse wavefront sensing (WFS) techniques with science camera imagery. The optical requirements for JWST are such tha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::372887211ccbc44d3b9eed5ac278c9b5
https://doi.org/10.1117/12.552433
https://doi.org/10.1117/12.552433