Results 21 to 30 of about 39,077 (276)
Optical measurements of phase steps in segmented mirrors - fundamental precision limits [PDF]
, 2006 Phase steps are an important type of wavefront aberrations generated by large telescopes with segmented mirrors. In a closed-loop correction cycle these phase steps have to be measured with the highest possible precision using natural reference stars ...
Caianiello ER +6 more
core +1 more source
Advances in optical engineering for future telescopes
Opto-Electronic Advances, 2021 Significant optical engineering advances at the University of Arizona are being made for design, fabrication, and construction of next generation astronomical telescopes. This summary review paper focuses on the technological advances in three key areas.
Daewook Kim +10 more
doaj +1 more source
Smart co-phasing system for segmented mirror telescopes [PDF]
, 2016 Space observations of fainter and more distant astronomical objects constantly require telescope primary mirrors with a larger size. The diameter of monolithic primary mirrors is limited to 10 m because of manufacturing and logistics limitations.
Simar, Juan Felipe +2 more
core +1 more source
Does French have theme vowels?
Glossa, 2022 Most Romance languages have reduced the Latin conjugation classes (CCs) maintaining only three main classes which are marked as general rule by different theme vowels (ThVs).
Eva-Maria Remberger, Natascha Pomino
doaj +1 more source
Metrology of IXO mirror segments [PDF]
SPIE Proceedings, 2011 For future x-ray astrophysics mission that demands optics with large throughput and excellent angular resolution, many telescope concepts build around assembling thin mirror segments in a Wolter I geometry, such as that originally proposed for the International X-ray Observatory.
Kai-Wing Chan +3 more
openaire +1 more source
Design Analysis of a Passive Buffer System for Space-Assembled Segmented Mirrors
Applied Sciences, 2019 This paper presents a passive buffer system of connection mechanism for space-assembled segmented mirrors. The purpose of assembling telescope in space is to overcome the limits of launch volume and mass to support ever increasing aperture sizes.
Xupeng Li +4 more
doaj +1 more source
James Webb Space Telescope Optical Simulation Testbed I: Overview and First Results [PDF]
, 2014 The James Webb Space Telescope (JWST) Optical Simulation Testbed (JOST) is a tabletop workbench to study aspects of wavefront sensing and control for a segmented space telescope, including both commissioning and maintenance activities.
Anderson, Rachel +15 more
core +1 more source
Tip/tilt Alignment for a Fizeau Interferometer via Defocus-Based Sub-Spot Separation
IEEE Photonics Journal, 2020 It is a crucial premise for Fizeau interferometric imaging that all the optical axes of sub-apertures are well aligned. What is challenging in tip/tilt alignment of such interferometers is the superposition of all the sub-aperture spots on the ...
Wenyi Lv +8 more
doaj +1 more source
A Binary Shaped Mask Coronagraph for a Segmented Pupil [PDF]
, 2010 We present the concept of a binary shaped mask coronagraph applicable to a telescope pupil including obscuration, based on previous works on binary shaped pupil mask by \citet{Kasdin2005} and \citet{Vanderbei1999}.
Abe, L., Enya, K.
core +1 more source
Apodized vortex coronagraph designs for segmented aperture telescopes [PDF]
, 2016 Current state-of-the-art high contrast imaging instruments take advantage of a number of elegant coronagraph designs to suppress starlight and image nearby faint objects, such as exoplanets and circumstellar disks. The ideal performance and complexity of
Jewell, Jeffrey +4 more
core +2 more sources