Results 21 to 30 of about 7,316 (282)
Piston Error Measurement for Segmented Telescopes Based on a Hybrid Artificial Neural Network
Sensors, 2023 To address the difficulty and complexity of detecting piston errors for segmented telescopes, this paper proposes a new piston error measurement method based on a hybrid artificial neural network.
Dan Yue +3 more
doaj +1 more source
Research on segmented mirror position error of optical system based on ZEMAX [PDF]
, 2017 We have modeled a segmented mirror optical system by software ZEMAX, and analyzed influence of segmented mirror's position error to the optical system imaging for the first time to author's best knowledge.
Li, Ruichang +10 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
Figure control for a fully segmented telescope mirror [PDF]
Applied Optics, 1982 A system is described to control the figure of a large telescope primary mirror that is composed of many individual segments. The geometry considered, employing hexagonal mirrors, allows a simple and economical control system. The system is shown to be reliable and effective in continuously maintaining the figure to the precision required for optical ...
Mast, T.S., Nelson, J.E.
openaire +3 more sources
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
ADAPTIVE OPTICS WITH SEGMENTED MIRROR OR DEFORMABLE MIRROR
Le Journal de Physique Colloques, 1980 Two kinds of adaptive optics (COAT) are presented : one with segmented mirrors (COAT = 19) with 19 mirrors and actuators and the other with a continuously deformable mirror and 7 actuators. Each mirror of COAT 19 is moved by a piezoelectric actuator performing correction and modulation (dithering in the 12-24 kHz band).
Gaffard, J. +3 more
openaire +2 more sources
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
Fizeau interferometric cophasing of segmented mirrors
Optics Express, 2012 Segmented mirror telescope designs address issues of mechanical rigidity, but introduce the problem of aligning, or cophasing, the separate segments to conform to the optimum mirror shape. While several solutions have been widely adopted, a few difficulties persist - the introduction of non-common path errors and an artificial division of the problem ...
Anthony C, Cheetham +3 more
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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
Thin Shell, Segmented X-Ray Mirrors [PDF]
, 2010 Thin foil mirrors were introduced as a means of achieving high throughput in an X-ray astronomical imaging system in applications for which high angular resolution was not necessary.
R. Petre
core +4 more sources